Pepperminty-Wiki/build/index.php

<?php
$start_time = microtime(true);
mb_internal_encoding("UTF-8");


/*
 * Pepperminty Wiki
 * ================
 * Inspired by Minty Wiki by am2064
	* Link: https://github.com/am2064/Minty-Wiki
 * 
 * Credits:
	* Code by @Starbeamrainbowlabs
	* Parsedown - by erusev and others on github from http://parsedown.org/
	* Mathematical Expression rendering
		* Code: @con-f-use <https://github.com/con-f-use>
		* Rendering: MathJax (https://www.mathjax.org/)
 * Bug reports:
	* #2 - Incorrect closing tag - nibreh <https://github.com/nibreh/>
	* #8 - Rogue <datalist /> tag - nibreh <https://github.com/nibreh/>
 */
$guiConfig = <<<'GUICONFIG'
{
	"sitename": {"type": "text", "description": "Your wiki's name.", "default": "Pepperminty Wiki"},
	"defaultpage": {"type": "text", "description": "The name of the page that will act as the home page for the wiki. This page will be served if you don't specify a page.", "default": "Main Page"},
	"admindetails_name": {"type": "text", "description": "Your name as the wiki administrator.", "default": "Administrator"},
	"admindetails_email": {"type": "email", "description": "Your email address as the wiki administrator. Will be displayed as a support contact address.", "default": "admin@localhost"},
	"favicon": {"type": "url", "description": "A url that points to the favicon you want to use for your wiki. This image  By default this is set to a data: url of a Peppermint (Credit: by bluefrog23, source: https://openclipart.org/detail/19571/peppermint-candy-by-bluefrog23)", "default": "data:image/png;base64,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"},
	"logo_url": {"type": "url", "description": "A url that points to the site's logo. Leave blank to disable. When enabled the logo will be inserted next to the site name on every page.", "default": "//starbeamrainbowlabs.com/images/logos/peppermint.png"},
	"logo_position": {"type": "text", "description": "The side of the site name at which the logo should be placed.", "default": "left"},
	"show_subpages": {"type": "text", "description": "Whether to show a list of subpages at the bottom of the page.", "default": true},
	"subpages_display_depth": {"type": "text", "description": "The depth to which we should display when listing subpages at the bottom the page.", "default": 3},
	"footer_message": {"type": "textarea", "description": "A message that will appear at the bottom of every page. May contain HTML.", "default": "All content is under <a href='?page=License' target='_blank'>this license</a>. Please make sure that you read and understand the license, especially if you are thinking about copying some (or all) of this site's content, as it may restrict you from doing so."},
	"editing_message": {"type": "textarea", "description": "A message that will appear just before the submit button on the editing page. May contain HTML.", "default": "<a href='?action=help#20-parser-default' target='_blank'>Formatting help</a> (<a href='https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet' target='_blank'>Markdown Cheatsheet</a>)<br />\nBy submitting your edit or uploading your file, you are agreeing to release your changes under <a href='?action=view&page=License' target='_blank'>this license</a>. Also note that if you don't want your work to be edited by other users of this site, please don't submit it here!"},
	"admindisplaychar": {"type": "text", "description": "The string that is prepended before an admin's name on the nav bar. Defaults to a diamond shape (&#9670;).", "default": "&#9670;"},
	"protectedpagechar": {"type": "text", "description": "The string that is prepended a page's name in the page title if it is protected. Defaults to a lock symbol. (&#128274;)", "default": "&#128274;"},
	"editing": {"type": "checkbox", "description": "Whether editing is enabled.", "default": true},
	"anonedits": {"type": "checkbox", "description": "Whether users who aren't logged in are allowed to edit your wiki.", "default": false},
	"maxpagesize": {"type": "number", "description": "The maximum page size in characters.", "default": 135000},
	"parser": {"type": "text", "description": "The parser to use when rendering pages. Defaults to an extended version of parsedown (http://parsedown.org/)", "default": "parsedown"},
	"clean_raw_html": {"type": "checkbox", "description": "Whether page sources should be cleaned of HTML before rendering. It is STRONGLY recommended that you keep this option turned on.", "default": true},
	"enable_math_rendering": {"type": "checkbox", "description": "Whether to enable client side rendering of mathematical expressions with MathJax (https://www.mathjax.org/). Math expressions should be enclosed inside of dollar signs ($). Turn off if you don't use it.", "default": true},
	"users": {"type": "usertable", "description": "An array of usernames and passwords - passwords should be hashed with sha256 (or sha3 if you have that option turned on)", "default": {
		"admin": "5e884898da28047151d0e56f8dc6292773603d0d6aabbdd62a11ef721d1542d8",
		"user": "873ac9ffea4dd04fa719e8920cd6938f0c23cd678af330939cff53c3d2855f34"
	}},
	"admins": {"type": "array", "description": "An array of usernames that are administrators. Administrators can delete and move pages.", "default": [ "admin" ]},
	"use_sha3": {"type": "checkbox", "description": "Whether to use the new sha3 hashing algorithm for passwords etc.", "default": false},
	"require_login_view": {"type": "checkbox", "description": "Whether to require that users login before they do anything else. Best used with the data_storage_dir option.", "default": false},
	"data_storage_dir": {"type": "text", "description": "The directory in which to store all files, except the main index.php.", "default": "."},
	"delayed_indexing_time": {"type": "number", "description": "The amount of time, in seconds, that pages should be blocked from being indexed by search engines after their last edit. Aka delayed indexing.", "default": 0},
	"nav_links": {"type": "nav", "description": "<p>An array of links and display text to display at the top of the site.<br />Format: <code>\"Display Text\": \"Link\"</code></p><p>You can also use strings here and they will be printed as-is, except the following special strings:</p><ul><li><code>user-status</code> - Expands to the user's login information. e.g. \"Logged in as {name}. | Logout\", or e.g. \"Browsing as Anonymous. | Login\".</li><li><code>search</code> - Expands to a search box.</li><li><code>divider</code> - Expands to a divider to separate stuff.</li><li><code>more</code> - Expands to the \"More...\" submenu.</li></ul>", "default": [
		"user-status",
		[
			"Home",
			"index.php"
		],
		"search",
		[
			"Read",
			"index.php?page={page}"
		],
		[
			"Edit",
			"index.php?action=edit&page={page}"
		],
		[
			"All&nbsp;Pages",
			"index.php?action=list"
		],
		"menu"
	]},
	"nav_links_extra": {"type": "nav", "description": "An array of additional links in the above format that will be shown under \"More\" subsection.", "default": [
		[
			"&#x1f553; Page History",
			"?action=history&page={page}"
		],
		[
			"&#x1f3ab; All&nbsp;Tags",
			"index.php?action=list-tags"
		],
		[
			"&zigrarr; Random Page",
			"?action=random"
		],
		[
			"Recent changes",
			"?action=recent-changes"
		],
		[
			"&#x1f845; Upload",
			"index.php?action=upload"
		],
		[
			"&#x2327; &#9670;Delete",
			"index.php?action=delete&page={page}"
		],
		[
			"&#x2398; &#9670;Move",
			"index.php?action=move&page={page}"
		],
		[
			"&#x1f510; &#9670;Toggle Protection",
			"index.php?action=protect&page={page}"
		]
	]},
	"nav_links_bottom": {"type": "nav", "description": "An array of links in the above format that will be shown at the bottom of the page.", "default": [
		[
			"&#x1f5b6; Printable version",
			"index.php?action=view&mode=printable&page={page}"
		],
		[
			"Credits",
			"index.php?action=credits"
		],
		[
			"Help",
			"index.php?action=help"
		]
	]},
	"upload_enabled": {"type": "checkbox", "description": "Whether to allow uploads to the server.", "default": true},
	"upload_allowed_file_types": {"type": "array", "description": "An array of mime types that are allowed to be uploaded.", "default": [
		"image/jpeg",
		"image/png",
		"image/gif",
		"image/webp",
		"image/svg+xml",
		"video/mp4",
		"video/webm",
		"audio/mp4",
		"audio/mpeg"
	]},
	"preview_file_type": {"type": "text", "description": "The default file type for previews.", "default": "image/png"},
	"default_preview_size": {"type": "number", "description": "The default size of preview images in pixels.", "default": 640},
	"mime_extension_mappings_location": {"type": "text", "description": "The location of a file that maps mime types onto file extensions and vice versa. Used to generate the file extension for an uploaded file. See the configuration guide for windows instructions.", "default": "/etc/mime.types"},
	"mime_mappings_overrides": {"type": "map", "description": "Override mappings to convert mime types into the appropriate file extension. Used to override the above file if it assigns weird extensions to any mime types.", "default": {
		"text/plain": "txt",
		"audio/mpeg": "mp3"
	}},
	"min_preview_size": {"type": "number", "description": "The minimum allowed size of generated preview images in pixels.", "default": 1},
	"max_preview_size": {"type": "number", "description": "The maximum allowed size of generated preview images in pixels.", "default": 2048},
	"search_characters_context": {"type": "number", "description": "The number of characters that should be displayed either side of a matching term in the context below each search result.", "default": 200},
	"search_title_matches_weighting": {"type": "number", "description": "The weighting to give to search term matches found in a page's title.", "default": 10},
	"search_tags_matches_weighting": {"type": "number", "description": "The weighting to give to search term matches found in a page's tags.", "default": 3},
	"dynamic_page_suggestion_count": {"type": "number", "description": "The number of dynamic page name suggestions to fetch from the server when typing in the page search box. Note that lowering this number doesn't <em>really</em> improve performance. Set to 0 to disable.", "default": 7 },
	"defaultaction": {"type": "text", "description": "The default action. This action will be performed if no other action is specified. It is recommended you set this to \"view\" - that way the user automatically views the default page (see above).", "default": "view"},
	"updateurl": {"type": "url", "description": "The url from which to fetch updates. Defaults to the master (development) branch. MAKE SURE THAT THIS POINTS TO A *HTTPS* URL, OTHERWISE SOMEONE COULD INJECT A VIRUS INTO YOUR WIKI!", "default": "https://raw.githubusercontent.com/sbrl/pepperminty-wiki/master/index.php"},
	"optimize_pages": {"type": "checkbox", "description": "Whether to optimise all webpages generated.", "default": true},
	"max_recent_changes": {"type": "number", "description": "The maximum number of recent changes to display on the recent changes page.", "default": 512},
	"export_allow_only_admins": {"type": "checkbox", "description": "Whether to only allow adminstrators to export the your wiki as a zip using the page-export module.", "default": false},
	"sessionprefix": {"type": "text", "description": "You shouldn't need to change this. The prefix that should be used in the names of the session variables. Defaults to \"auto\", which automatically generates this field. See the readme for more information.", "default": "auto"},
	"sessionlifetime": { "type": "number", "description": "Again, you shouldn't need to change this under normal circumstances. This setting controls the lifetime of a login session. Defaults to 24 hours, but it may get cut off sooner depending on the underlying PHP session lifetime.", "default": 86400 },
	"css": {"type": "textarea", "description": "A string of css to include. Will be included in the &lt;head&gt; of every page inside a &lt;style&gt; tag. This may also be an absolute url - urls will be referenced via a &lt;link rel='stylesheet' /&gt; tag.", "default": "auto"}
}
GUICONFIG;

$guiConfig = json_decode($guiConfig);
$settings = new stdClass();
if(!file_exists("peppermint.json"))
{
	// Copy the default settings over to the main settings array
	foreach ($guiConfig as $key => $value)
		$settings->$key = $value->default;
	// Generate a random secret
	$settings->secret = bin2hex(openssl_random_pseudo_bytes(16));
	file_put_contents("peppermint.json", json_encode($settings, JSON_PRETTY_PRINT));
}
else
	$settings = json_decode(file_get_contents("peppermint.json"));

if($settings === null)
{
	header("content-type: text/plain");
	exit("Error: Failed to decode the settings file! Does it contain a syntax error?");
}

// Fill in any missing properties
$settingsUpgraded = false;
foreach($guiConfig as $key => $propertyData)
{
	if(!isset($settings->$key))
	{
		$settings->$key = $propertyData->default;
		$settingsUpgraded = true;
	}
}
if($settingsUpgraded)
	file_put_contents("peppermint.json", json_encode($settings, JSON_PRETTY_PRINT));

// Insert the default CSS if requested
$defaultCSS = <<<THEMECSS
body { margin: 2rem 0; background: #eee8f2; line-height: 1.45em; color: #111111; font-family: sans-serif; }

nav { display: flex; background-color: #8a62a7; color: #ffa74d;  }
nav.top { position: absolute; top: 0; left: 0; right: 0; box-shadow: inset 0 -0.6rem 0.8rem -0.5rem rgba(50, 50, 50, 0.5); }
nav.bottom { position: absolute; left: 0; right: 0; box-shadow: inset 0 0.8rem 0.8rem -0.5rem rgba(50, 50, 50, 0.5); }

nav > span { flex: 1; text-align: center; line-height: 2; display: inline-block; margin: 0; padding: 0.3rem 0.5rem; border-left: 3px solid #442772; border-right: 3px solid #442772; }
nav:not(.nav-more-menu) a { text-decoration: none; font-weight: bolder; color: inherit; }
.nav-divider { color: transparent; }

.nav-more { position: relative; background-color: #442772; min-width: 10em; }
.nav-more label { cursor: pointer; }
.nav-more-menu { display: none; position: absolute; flex-direction: column; top: 2.6rem; right: -0.2rem; background-color: #8a62a7; border-top: 3px solid #442772; border-bottom: 3px solid #442772; }
input[type=checkbox]:checked ~ .nav-more-menu { display: block; box-shadow: 0.4rem 0.4rem 1rem 0 rgba(50, 50, 50, 0.5); }
.nav-more-menu span { min-width: 10rem; }

.inflexible { flex: none; }
.off-screen { position: absolute; top: -1000px; left: -1000px;}

input[type=search] { width: 14rem; padding: 0.3rem 0.4rem; font-size: 1rem; color: white; background: rgba(255, 255, 255, 0.4); border: 0; border-radius: 0.3rem; }
input[type=search]::-webkit-input-placeholder { color : rgba(255, 255, 255, 0.75); }
input[type=button], input[type=submit] { cursor: pointer; }

.sidebar { position: relative; z-index: 100; margin-top: 0.6rem; padding: 1rem 3rem 2rem 0.4rem; background: #9e7eb4; box-shadow: inset -0.6rem 0 0.8rem -0.5rem rgba(50, 50, 50, 0.5); }
.sidebar a { color: #ffa74d; }

.sidebar ul { position: relative; margin: 0.3rem 0.3rem 0.3rem 1rem; padding: 0.3rem 0.3rem 0.3rem 1rem; list-style-type: none; }
.sidebar li { position: relative; margin: 0.3rem; padding: 0.3rem; }

.sidebar ul:before { content: ""; position: absolute; top: 0; left: 0; height: 100%; border-left: 2px dashed rgba(50, 50, 50, 0.4); }
.sidebar li:before { content: ""; position: absolute; width: 1rem; top: 0.8rem; left: -1.2rem; border-bottom: 2px dashed rgba(50, 50, 50, 0.4); }

.preview { text-align: center; }
.preview:hover img, .preview:hover video, .preview:hover audio { --checkerboard-bg: rgba(200, 200, 200, 0.2); max-width: 100%; background-color: #eee; background-image: linear-gradient(45deg, var(--checkerboard-bg) 25%, transparent 25%, transparent 75%, var(--checkerboard-bg) 75%, var(--checkerboard-bg)), linear-gradient(45deg, var(--checkerboard-bg) 25%, transparent 25%, transparent 75%, var(--checkerboard-bg) 75%, var(--checkerboard-bg)); background-size:2em 2em; background-position:0 0, 1em 1em; }
.image-controls ul { list-style-type: none; margin: 5px; padding: 5px; }
.image-controls li { display: inline-block; margin: 5px; padding: 5px; }
.link-display { margin-left: 0.5rem; }

audio, video, img { max-width: 100%; }
figure:not(.preview) { display: inline-block; }
figure:not(.preview) > :first-child { display: block; }
figcaption { text-align: center; }

.printable { padding: 2rem; }

h1 { text-align: center; }
.sitename { margin-top: 5rem; margin-bottom: 3rem; font-size: 2.5rem; }
.logo { max-width: 4rem; max-height: 4rem; vertical-align: middle; }
.logo.small { max-width: 2rem; max-height: 2rem; }
main:not(.printable) { padding: 2rem 2rem 0.5rem 2rem; background: #faf8fb; box-shadow: 0 0.1rem 1rem 0.3rem rgba(50, 50, 50, 0.5); }

blockquote { padding-left: 1em; border-left: 0.2em solid #442772; border-radius: 0.2rem; }

a.redlink:link { color: rgb(230, 7, 7); }
a.redlink:visited { color: rgb(130, 15, 15); /*#8b1a1a*/ }

.search-result { position: relative; }
.search-result::before { content: attr(data-result-number); position: relative; top: 3rem; color: rgba(33, 33, 33, 0.3); font-size: 2rem; }
.search-result::after { content: "Rank: " attr(data-rank); position: absolute; top: 3.8rem; right: 0.7rem; color: rgba(50, 50, 50, 0.3); }
.search-result > h2 { margin-left: 3rem; }
.search-context { max-height: 20em; overflow: hidden; }
.search-context::after { content: ""; position: absolute; bottom: 0; width: 100%; height: 3em; display: block; background: linear-gradient(to bottom, transparent, #faf8fb); pointer-events: none; }

textarea[name=content] { height: 30em; }
label:not(.link-display-label) { display: inline-block; /*min-width: 16rem;*/ }
input[type=text]:not(.link-display), input[type=password], input[type=url], input[type=email], input[type=number], textarea { margin: 0.5rem 0; }
input[type=text], input[type=password], input[type=url], input[type=email], input[type=number], textarea, #search-box { padding: 0.5rem 0.8rem; background: #d5cbf9; border: 0; border-radius: 0.3rem; font-size: 1rem; color: #442772; }
textarea { min-height: 10em; line-height: 1.3em; font-size: 1.25rem; }
textarea, textarea ~ input[type=submit], #search-box { width: calc(100% - 0.3rem); box-sizing: border-box; }
textarea ~ input[type=submit] { margin: 0.5rem 0; padding: 0.5rem; font-weight: bolder; }
.editform input[type=text] { width: calc(100% - 0.3rem); box-sizing: border-box; }
.editfor textarea { min-height: 35rem; }

.file-gallery { margin: 0.5em; padding: 0.5em; list-style-type: none; }
.file-gallery > li { display: inline-block; min-width: attr(data-gallery-width); padding: 1em; text-align: center; }
.file-gallery > li img, .file-gallery > li video, .file-gallery > li audio { display: block; margin: 0 auto; background-color: white; }

.page-tags-display { margin: 0.5rem 0 0 0; padding: 0; list-style-type: none; }
.page-tags-display li { display: inline-block; margin: 0.5rem; padding: 0.5rem; background: #e2d5eb; white-space: nowrap; }
.page-tags-display li a { color: #fb701a; text-decoration: none; }
.page-tags-display li::before { content: "\\A"; position: relative; top: 0.03rem; left: -0.9rem; width: 0; height: 0; border-top: 0.6rem solid transparent; border-bottom: 0.6rem solid transparent; border-right: 0.5rem solid #e2d5eb; }

.page-list { list-style-type: none; margin: 0.3rem; padding: 0.3rem; }
.page-list li:not(.header) { margin: 0.3rem; padding: 0.3rem; }
.page-list li .size { margin-left: 0.7rem; color: rgba(30, 30, 30, 0.5); }
.page-list li .editor { display: inline-block; margin: 0 0.5rem; }
.page-list li .tags { margin: 0 1rem; }
.tag-list { list-style-type: none; margin: 0.5rem; padding: 0.5rem; }
.tag-list li { display: inline-block; margin: 1rem; }
.mini-tag { background: #e2d5eb; padding: 0.2rem 0.4rem; color: #fb701a; text-decoration: none; }

.help-section-header::after { content: "#" attr(id); float: right; color: rgba(0, 0, 0, 0.4); font-size: 0.8rem; font-weight: normal; }

.cursor-query { cursor: help; }

summary { cursor: pointer; }

.larger { color: rgb(9, 180, 0); }
.smaller, .deletion { color: rgb(207, 28, 17); }
.nochange { color: rgb(132, 123, 199); font-style: italic; }
.significant { font-weight: bolder; font-size: 1.1rem; }
.deletion, .deletion > .editor { text-decoration: line-through; }

.highlighted-diff { white-space: pre-wrap; }
.diff-added { background-color: rgba(31, 171, 36, 0.6); color: rgba(23, 125, 27, 1); }
.diff-removed { background-color: rgba(255, 96, 96, 0.6); color: rgba(191, 38, 38, 1); }

.newpage::before { content: "N"; margin: 0 0.3em 0 -1em; font-weight: bolder; text-decoration: underline dotted; }
.upload::before { content: "\\1f845"; margin: 0 0.1em 0 -1.1em; }

footer { padding: 2rem; }
/* #ffdb6d #36962c */
THEMECSS;
if($settings->css === "auto")
	$settings->css = $defaultCSS;




///////////////////////////////////////////////////////////////////////////////////////////////
/////////////// Do not edit below this line unless you know what you are doing! ///////////////
///////////////////////////////////////////////////////////////////////////////////////////////
$version = "v0.13-dev";
/// Environment ///
$env = new stdClass();
$env->action = $settings->defaultaction;
$env->page = "";
$env->page_filename = "";
$env->is_history_revision = false;
$env->history = new stdClass();
$env->history->revision_number = -1;
$env->history->revision_data = false;
$env->user = "Anonymous";
$env->is_logged_in = false;
$env->is_admin = false;
$env->storage_prefix = $settings->data_storage_dir . DIRECTORY_SEPARATOR;
$env->perfdata = new stdClass();
/// Paths ///
$paths = new stdClass();
$paths->pageindex = "pageindex.json"; // The pageindex
$paths->searchindex = "invindex.json"; // The inverted index used for searching
$paths->idindex = "idindex.json"; // The index that converts ids to page names

// Prepend the storage data directory to all the defined paths.
foreach ($paths as &$path) {
	$path = $env->storage_prefix . $path;
}

$paths->upload_file_prefix = "Files/"; // The prefix to add to uploaded files

session_start();
// Make sure that the login cookie lasts beyond the end of the user's session
setcookie(session_name(), session_id(), time() + $settings->sessionlifetime);
///////// Login System /////////
// Clear expired sessions
if(isset($_SESSION[$settings->sessionprefix . "-expiretime"]) and
   $_SESSION[$settings->sessionprefix . "-expiretime"] < time())
{
	// Clear the session variables
	$_SESSION = [];
	session_destroy();
	$env->is_logged_in = false;
	$env->user = "Anonymous";
}

if(!isset($_SESSION[$settings->sessionprefix . "-user"]) and
  !isset($_SESSION[$settings->sessionprefix . "-pass"]))
{
	// The user is not logged in
	$env->is_logged_in = false;
}
else
{
	$env->user = $_SESSION[$settings->sessionprefix . "-user"];
	$env->pass = $_SESSION[$settings->sessionprefix . "-pass"];
	if($settings->users->{$env->user} == $env->pass)
	{
		// The user is logged in
		$env->is_logged_in = true;
	}
	else
	{
		// The user's login details are invalid (what is going on here?)
		// Unset the session variables, treat them as an anonymous user,
		// and get out of here
		$env->is_logged_in = false;
		$env->user = "Anonymous";
		$env->pass = "";
		// Clear the session data
		$_SESSION = []; //delete all the variables
		session_destroy(); //destroy the session
	}
}
//check to see if the currently logged in user is an admin
$env->is_admin = false;
if($env->is_logged_in)
{
	foreach($settings->admins as $admin_username)
	{
		if($admin_username == $env->user)
		{
			$env->is_admin = true;
			break;
		}
	}
}
/////// Login System End ///////

////////////////////
// APIDoc strings //
////////////////////
/**
 * @apiDefine Moderator	Only users loggged with a moderator account may use this call.
 */
/**
* @apiDefine User		Only users loggged in may use this call.
*/
/**
* @apiDefine Anonymous	Anybody may use this call.
*/
/**
 * @apiDefine	UserNotLoggedInError
 * @apiError	UserNotLoggedInError	You didn't log in before sending this request.
 */
/**
* @apiDefine	UserNotModeratorError
* @apiError	UserNotModeratorError	You weren't loggged in as a moderator before sending this request.
*/
/**
* @apiDefine	PageParameter
* @apiParam	{string}	page	The page to operate on.
*/
////////////////////

///////////////////////////////////////////////////////////////////////////////
////////////////////////////////// Functions //////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
/**
 * Get the actual absolute origin of the request sent by the user.
 * @param  array	$s						The $_SERVER variable contents. Defaults to $_SERVER.
 * @param  bool		$use_forwarded_host		Whether to utilise the X-Forwarded-Host header when calculating the actual origin.
 * @return string							The actual origin of the user's request.
 */
function url_origin( $s = false, $use_forwarded_host = false )
{
	if($s === false) $s = $_SERVER;
    $ssl      = ( ! empty( $s['HTTPS'] ) && $s['HTTPS'] == 'on' );
    $sp       = strtolower( $s['SERVER_PROTOCOL'] );
    $protocol = substr( $sp, 0, strpos( $sp, '/' ) ) . ( ( $ssl ) ? 's' : '' );
    $port     = $s['SERVER_PORT'];
    $port     = ( ( ! $ssl && $port=='80' ) || ( $ssl && $port=='443' ) ) ? '' : ':'.$port;
    $host     = ( $use_forwarded_host && isset( $s['HTTP_X_FORWARDED_HOST'] ) ) ? $s['HTTP_X_FORWARDED_HOST'] : ( isset( $s['HTTP_HOST'] ) ? $s['HTTP_HOST'] : null );
    $host     = isset( $host ) ? $host : $s['SERVER_NAME'] . $port;
    return $protocol . '://' . $host;
}

/**
 * Get the full url, as requested by the client.
 * @see		http://stackoverflow.com/a/8891890/1460422	This Stackoverflow answer.
 * @param	array	$s                  The $_SERVER variable. Defaults to $_SERVER.
 * @param	bool		$use_forwarded_host Whether to take the X-Forwarded-Host header into account.
 * @return	string						The full url, as requested by the client.
 */
function full_url( $s = false, $use_forwarded_host = false )
{
    return url_origin( $s, $use_forwarded_host ) . $s['REQUEST_URI'];
}

/**
 * Converts a filesize into a human-readable string.
 * From http://php.net/manual/en/function.filesize.php#106569
 * Edited by Starbeamrainbowlabs.
 * @param	number	$bytes		The number of bytes to convert.
 * @param	number	$decimals	The number of decimal places to preserve.
 * @return 	string				A human-readable filesize.
 */
function human_filesize($bytes, $decimals = 2)
{
	$sz = ["b", "kb", "mb", "gb", "tb", "pb", "eb", "yb", "zb"];
	$factor = floor((strlen($bytes) - 1) / 3);
	$result = round($bytes / pow(1024, $factor), $decimals);
	return $result . @$sz[$factor];
}

/**
 * Calculates the time since a particular timestamp and returns a
 * human-readable result.
 * From http://goo.gl/zpgLgq.
 * @param	integer	$time	The timestamp to convert.
 * @return	string			The time since the given timestamp as
 *                      	a human-readable string.
 */
function human_time_since($time)
{
	$timediff = time() - $time;
	$tokens = array (
		31536000 => 'year',
		2592000 => 'month',
		604800 => 'week',
		86400 => 'day',
		3600 => 'hour',
		60 => 'minute',
		1 => 'second'
	);
	foreach ($tokens as $unit => $text) {
		if ($timediff < $unit) continue;
		$numberOfUnits = floor($timediff / $unit);
		return $numberOfUnits.' '.$text.(($numberOfUnits>1)?'s':'').' ago';
	}
}

/**
 * A recursive glob() function.
 * From http://in.php.net/manual/en/function.glob.php#106595
 * @param  string  $pattern The glob pattern to use to find filenames.
 * @param  integer $flags   The glob flags to use when finding filenames.
 * @return array			An array of the filepaths that match the given glob.
 */
function glob_recursive($pattern, $flags = 0)
{
	$files = glob($pattern, $flags);
	foreach (glob(dirname($pattern).'/*', GLOB_ONLYDIR|GLOB_NOSORT) as $dir)
	{
		$prefix = "$dir/";
		// Remove the "./" from the beginning if it exists
		if(substr($prefix, 0, 2) == "./") $prefix = substr($prefix, 2);
		$files = array_merge($files, glob_recursive($prefix . basename($pattern), $flags));
	}
	return $files;
}

/**
 * Gets a list of all the sub pages of the current page.
 * @param	object	$pageindex	The pageindex to use to search.
 * @param	string	$pagename	The name of the page to list the sub pages of.
 * @return	object				An object containing all the subpages and their
 *     respective distances from the given page name in the pageindex tree.
 */
function get_subpages($pageindex, $pagename)
{
	$pagenames = get_object_vars($pageindex);
	$result = new stdClass();

	$stem = "$pagename/";
	$stem_length = strlen($stem);
	foreach($pagenames as $entry => $value)
	{
		if(substr($entry, 0, $stem_length) == $stem)
		{
			// We found a subpage

			// Extract the subpage's key relative to the page that we are searching for
			$subpage_relative_key = substr($entry, $stem_length, -3);
			// Calculate how many times removed the current subpage is from the current page. 0 = direct descendant.
			$times_removed = substr_count($subpage_relative_key, "/");
			// Store the name of the subpage we found
			$result->$entry = $times_removed;
		}
	}

	unset($pagenames);
	return $result;
}

/**
 * Makes sure that a subpage's parents exist.
 * Note this doesn't check the pagename itself.
 * @param The pagename to check.
 */
function check_subpage_parents($pagename)
{
	global $pageindex, $paths, $env;
	// Save the new pageindex and return if there aren't any more parent pages to check
	if(strpos($pagename, "/") === false)
	{
		file_put_contents($paths->pageindex, json_encode($pageindex, JSON_PRETTY_PRINT));
		return;
	}

	$parent_pagename = substr($pagename, 0, strrpos($pagename, "/"));
	$parent_page_filename = "$parent_pagename.md";
	if(!file_exists($env->storage_prefix . $parent_page_filename))
	{
		// This parent page doesn't exist! Create it and add it to the page index.
		touch($env->storage_prefix . $parent_page_filename, 0);

		$newentry = new stdClass();
		$newentry->filename = $parent_page_filename;
		$newentry->size = 0;
		$newentry->lastmodified = 0;
		$newentry->lasteditor = "none";
		$pageindex->$parent_pagename = $newentry;
	}

	check_subpage_parents($parent_pagename);
}

/**
 * Makes a path safe.
 * Paths may only contain alphanumeric characters, spaces, underscores, and
 * dashes.
 * @param	string	$string	The string to make safe.
 * @return	string			A safe version of the given string.
 */
function makepathsafe($string)
{
	// Old restrictive system
	//$string = preg_replace("/[^0-9a-zA-Z\_\-\ \/\.]/i", "", $string);
	// Remove reserved characters
	$string = preg_replace("/[?%*:|\"><()\\[\\]]/i", "", $string);
	// Collapse multiple dots into a single dot
	$string = preg_replace("/\.+/", ".", $string);
	return $string;
}

/**
 * Hides an email address from bots by adding random html entities.
 * @param	string	$str	The original email address
 * @return	string			The mangled email address.
 */
function hide_email($str)
{
	$hidden_email = "";
	for($i = 0; $i < strlen($str); $i++)
	{
		if($str[$i] == "@")
		{
			$hidden_email .= "&#" . ord("@") . ";";
			continue;
		}
		if(rand(0, 1) == 0)
			$hidden_email .= $str[$i];
		else
			$hidden_email .= "&#" . ord($str[$i]) . ";";
	}

	return $hidden_email;
}
/**
 * Checks to see if $haystack starts with $needle.
 * @param	string	$haystack	The string to search.
 * @param	string	$needle		The string to search for at the beginning
 *                        		of $haystack.
 * @return	boolean				Whether $needle can be found at the beginning
 *                            	of $haystack.
 */
function starts_with($haystack, $needle)
{
	 $length = strlen($needle);
	 return (substr($haystack, 0, $length) === $needle);
}

/**
 * Case-insensitively finds all occurrences of $needle in $haystack. Handles
 * UTF-8 characters correctly.
 * From http://www.pontikis.net/tip/?id=16, and
 * based on http://www.php.net/manual/en/function.strpos.php#87061
 * @param	string			$haystack	The string to search.
 * @param	string			$needle		The string to find.
 * @return	array || false				An array of match indices, or false if
 *                  					nothing was found.
 */
function mb_stripos_all($haystack, $needle) {
	$s = 0; $i = 0;
	while(is_integer($i)) {
		$i = function_exists("mb_stripos") ? mb_stripos($haystack, $needle, $s) : stripos($haystack, $needle, $s);
		if(is_integer($i)) {
			$aStrPos[] = $i;
			$s = $i + (function_exists("mb_strlen") ? mb_strlen($needle) : strlen($needle));
		}
	}
	if(isset($aStrPos))
		return $aStrPos;
	else
		return false;
}

/**
 * Tests whether a string ends with a given substring.
 * @param  string $whole The string to test against.
 * @param  string $end   The substring test for.
 * @return bool          Whether $whole ends in $end.
 */
function endsWith($whole, $end)
{
    return (strpos($whole, $end, strlen($whole) - strlen($end)) !== false);
}

/**
 * Returns the system's mime type mappings, considering the first extension
 * listed to be cacnonical.
 * From http://stackoverflow.com/a/1147952/1460422 by chaos.
 * Edited by Starbeamrainbowlabs.
 * @return array	An array of mime type mappings.
 */
function system_mime_type_extensions()
{
	global $settings;
	$out = array();
	$file = fopen($settings->mime_extension_mappings_location, 'r');
	while(($line = fgets($file)) !== false) {
		$line = trim(preg_replace('/#.*/', '', $line));
		if(!$line)
			continue;
		$parts = preg_split('/\s+/', $line);
		if(count($parts) == 1)
			continue;
		$type = array_shift($parts);
		if(!isset($out[$type]))
			$out[$type] = array_shift($parts);
	}
	fclose($file);
	return $out;
}

/**
 * Converts a given mime type to it's associated file extension.
 * From http://stackoverflow.com/a/1147952/1460422 by chaos.
 * Edited by Starbeamrainbowlabs.
 * @param  string $type The mime type to convert.
 * @return string       The extension for the given mime type.
 */
function system_mime_type_extension($type)
{
	static $exts;
	if(!isset($exts))
		$exts = system_mime_type_extensions();
	return isset($exts[$type]) ? $exts[$type] : null;
}

/**
 * Returns the system MIME type mapping of extensions to MIME types.
 * From http://stackoverflow.com/a/1147952/1460422 by chaos.
 * Edited by Starbeamrainbowlabs.
 * @return array An array mapping file extensions to their associated mime types.
 */
function system_extension_mime_types()
{
	global $settings;
    $out = array();
    $file = fopen($settings->mime_extension_mappings_location, 'r');
    while(($line = fgets($file)) !== false) {
        $line = trim(preg_replace('/#.*/', '', $line));
        if(!$line)
            continue;
        $parts = preg_split('/\s+/', $line);
        if(count($parts) == 1)
            continue;
        $type = array_shift($parts);
        foreach($parts as $part)
            $out[$part] = $type;
    }
    fclose($file);
    return $out;
}
/**
 * Converts a given file extension to it's associated mime type.
 * From http://stackoverflow.com/a/1147952/1460422 by chaos.
 * Edited by Starbeamrainbowlabs.
 * @param  string $ext The extension to convert.
 * @return string      The mime type associated with the given extension.
 */
function system_extension_mime_type($ext) {
	static $types;
    if(!isset($types))
        $types = system_extension_mime_types();
    $ext = strtolower($ext);
    return isset($types[$ext]) ? $types[$ext] : null;
}

/**
 * Generates a stack trace.
 * @param	bool	$log_trace	Whether to send the stack trace to the error log.
 * @param	bool	$full		Whether to output a full description of all the variables involved.
 * @return	string				A string prepresentation of a stack trace.
 */
function stack_trace($log_trace = true, $full = false)
{
	$result = "";
	$stackTrace = debug_backtrace();
	$stackHeight = count($stackTrace);
	foreach ($stackTrace as $i => $stackEntry)
	{
		$result .= "#" . ($stackHeight - $i) . ": ";
		$result .= (isset($stackEntry["file"]) ? $stackEntry["file"] : "(unknown file)") . ":" . (isset($stackEntry["line"]) ? $stackEntry["line"] : "(unknown line)") . " - ";
		if(isset($stackEntry["function"]))
		{
			$result .= "(calling " . $stackEntry["function"];
			if(isset($stackEntry["args"]) && count($stackEntry["args"]))
			{
				$result .= ": ";
				$result .= implode(", ", array_map($full ? "var_dump_ret" : "var_dump_short", $stackEntry["args"]));
			}
		}
		$result .= ")\n";
	}
	if($log_trace)
		error_log($result);
	return $result;
}
/**
 * Calls var_dump() and returns the output.
 * @param	mixed	$var	The thing to pass to var_dump().
 * @return	string			The output captured from var_dump().
 */
function var_dump_ret($var)
{
	ob_start();
	var_dump($var);
	return ob_get_clean();
}

/**
 * Calls var_dump(), shortening the output for various types.
 * @param	mixed 	$var	The thing to pass to var_dump().
 * @return	string			A shortened version of the var_dump() output.
 */
function var_dump_short($var)
{
	$result = trim(var_dump_ret($var));
	if(substr($result, 0, 6) === "object" || substr($result, 0, 5) === "array")
	{
		$result = substr($result, 0, strpos($result, " ")) . " { ... }";
	}
	return $result;
}

/**
 * Polyfill getallheaders()
 */
if (!function_exists('getallheaders'))  {
    function getallheaders()
    {
        if (!is_array($_SERVER))
            return [];

        $headers = array();
        foreach ($_SERVER as $name => $value) {
            if (substr($name, 0, 5) == 'HTTP_') {
                $headers[str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))))] = $value;
            }
        }
        return $headers;
    }
}
/**
 * Renders a timestamp in HTML.
 * @param  int $timestamp The timestamp to render.
 * @return string         HTML representing the given timestamp.
 */
function render_timestamp($timestamp)
{
	return "<time class='cursor-query' title='" . date("l jS \of F Y \a\\t h:ia T", $timestamp) . "'>" . human_time_since($timestamp) . "</time>";
}
/**
 * Renders a page name in HTML.
 * @param  object $rchange The recent change to render as a page name
 * @return string          HTML representing the name of the given page.
 */
function render_pagename($rchange)
{
	global $pageindex;
	$pageDisplayName = $rchange->page;
	if(isset($pageindex->$pageDisplayName) and !empty($pageindex->$pageDisplayName->redirect))
		$pageDisplayName = "<em>$pageDisplayName</em>";
	$pageDisplayLink = "<a href='?page=" . rawurlencode($rchange->page) . "'>$pageDisplayName</a>";
	return $pageDisplayName;
}
/**
 * Renders an editor's name in HTML.
 * @param  string $editorName The name of the editor to render.
 * @return string             HTML representing the given editor's name.
 */
function render_editor($editorName)
{
	return "<span class='editor'>&#9998; $editorName</span>";
}

///////////////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////////////////////////////
////////////////////// Security and Consistency Measures //////////////////////
///////////////////////////////////////////////////////////////////////////////

/*
 * Sort out the pageindex. Create it if it doesn't exist, and load + parse it
 * if it does.
 */
if(!file_exists($paths->pageindex))
{
	$glob_str = $env->storage_prefix . "*.md";
	$existingpages = glob_recursive($glob_str);
	// Debug statements. Uncomment when debugging the pageindex regenerator.
	// var_dump($env->storage_prefix);
	// var_dump($glob_str);
	// var_dump($existingpages);
	$pageindex = new stdClass();
	// We use a for loop here because foreach doesn't loop over new values inserted
	// while we were looping
	for($i = 0; $i < count($existingpages); $i++)
	{
		$pagefilename = $existingpages[$i];
		
		// Create a new entry
		$newentry = new stdClass();
		$newentry->filename = utf8_encode(substr( // Store the filename, whilst trimming the storage prefix
			$pagefilename,
			strlen(preg_replace("/^\.\//i", "", $env->storage_prefix)) // glob_recursive trim the ./ from returned filenames , so we need to as well
		));
		// Remove the `./` from the beginning if it's still hanging around
		if(substr($newentry->filename, 0, 2) == "./")
			$newentry->filename = substr($newentry->filename, 2);
		$newentry->size = filesize($pagefilename); // Store the page size
		$newentry->lastmodified = filemtime($pagefilename); // Store the date last modified
		// Todo find a way to keep the last editor independent of the page index
		$newentry->lasteditor = utf8_encode("unknown"); // Set the editor to "unknown"
		// Extract the name of the (sub)page without the ".md"
		$pagekey = utf8_encode(substr($newentry->filename, 0, -3));
		
		if(file_exists($env->storage_prefix . $pagekey) && // If it exists...
			!is_dir($env->storage_prefix . $pagekey)) // ...and isn't a directory
		{
			// This page (potentially) has an associated file!
			// Let's investigate.
			
			// Blindly add the file to the pageindex for now.
			// Future We might want to do a security check on the file later on.
			// File a bug if you think we should do this.
			$newentry->uploadedfile = true; // Yes this page does have an uploaded file associated with it
			$newentry->uploadedfilepath = $pagekey; // It's stored here
			
			// Work out what kind of file it really is
			$mimechecker = finfo_open(FILEINFO_MIME_TYPE);
			$newentry->uploadedfilemime = finfo_file($mimechecker, $env->storage_prefix . $pagekey);
		}
		
		// Debug statements. Uncomment when debugging the pageindex regenerator.
		// echo("pagekey: ");
		// var_dump($pagekey);
		// echo("newentry: ");
		// var_dump($newentry);
		
		// Subpage parent checker
		if(strpos($pagekey, "/") !== false)
		{
			// We have a sub page people
			// Work out what our direct parent's key must be in order to check to
			// make sure that it actually exists. If it doesn't, then we need to
			// create it.
			$subpage_parent_key = substr($pagekey, 0, strrpos($pagekey, "/"));
			$subpage_parent_filename = "$env->storage_prefix$subpage_parent_key.md";
			if(array_search($subpage_parent_filename, $existingpages) === false)
			{
				// Our parent page doesn't actually exist - create it
				touch($subpage_parent_filename, 0);
				// Furthermore, we should add this page to the list of existing pages
				// in order for it to be indexed
				$existingpages[] = $subpage_parent_filename;
			}
		}

		// Store the new entry in the new page index
		$pageindex->$pagekey = $newentry;
	}
	file_put_contents($paths->pageindex, json_encode($pageindex, JSON_PRETTY_PRINT));
	unset($existingpages);
}
else
{
	$pageindex_read_start = microtime(true);
	$pageindex = json_decode(file_get_contents($paths->pageindex));
	$env->perfdata->pageindex_decode_time = round((microtime(true) - $pageindex_read_start)*1000, 3);
	header("x-pageindex-decode-time: " . $env->perfdata->pageindex_decode_time . "ms");
}

//////////////////////////
///// Page id system /////
//////////////////////////
if(!file_exists($paths->idindex))
	file_put_contents($paths->idindex, "{}");
$idindex_decode_start = microtime(true);
$idindex = json_decode(file_get_contents($paths->idindex));
$env->perfdata->idindex_decode_time = round((microtime(true) - $idindex_decode_start)*1000, 3);
class ids
{
	/*
	 * @summary Gets the page id associated with the given pagename.
	 */
	public static function getid($pagename)
	{
		global $idindex;

		foreach ($idindex as $id => $entry)
		{
			if($entry == $pagename)
				return $id;
		}

		// This pagename doesn't have an id - assign it one quick!
		return self::assign($pagename);
	}

	/*
	 * @summary Gets the page name associated with the given page id.
	 */
	public static function getpagename($id)
	{
		global $idindex;

		if(!isset($idindex->$id))
			return false;
		else
			return $idindex->$id;
	}
	
	/*
	 * @summary Moves a page in the id index from $oldpagename to $newpagename.
	 *		  Note that this function doesn't perform any special checks to
	 *		  make sure that the destination name doesn't already exist.
	 */
	public static function movepagename($oldpagename, $newpagename)
	{
		global $idindex, $paths;
		
		$pageid = self::getid($oldpagename);
		$idindex->$pageid = $newpagename;
		
		file_put_contents($paths->idindex, json_encode($idindex));
	}
	
	/*
	 * @summary Removes the given page name from the id index. Note that this
	 *		  function doesn't handle multiple entries with the same name.
	 */
	public static function deletepagename($pagename)
	{
		global $idindex, $paths;
		
		// Get the id of the specified page
		$pageid = self::getid($pagename);
		// Remove it from the pageindex
		unset($idindex->$pageid);
		// Save the id index
		file_put_contents($paths->idindex, json_encode($idindex));
	}

	/*
	 * @summary Assigns an id to a pagename. Doesn't check to make sure that
	 * 			pagename doesn't exist in the pageindex.
	 */
	protected static function assign($pagename)
	{
		global $idindex, $paths;

		$nextid = count(array_keys(get_object_vars($idindex)));
		// Increment the generated id until it's unique
		while(isset($idindex->nextid))
			$nextid++;
		
		// Update the id index
		$idindex->$nextid = utf8_encode($pagename);

		// Save the id index
		file_put_contents($paths->idindex, json_encode($idindex));

		return $nextid;
	}
}
//////////////////////////
//////////////////////////

// Work around an Opera + Syntaxtic bug where there is no margin at the left
// hand side if there isn't a query string when accessing a .php file.
if(!isset($_GET["action"]) and !isset($_GET["page"]))
{
	http_response_code(302);
	header("location: index.php?action=$settings->defaultaction&page=$settings->defaultpage");
	exit();
}

// Make sure that the action is set
if(!isset($_GET["action"]))
	$_GET["action"] = $settings->defaultaction;
// Make sure that the page is set
if(!isset($_GET["page"]) or strlen($_GET["page"]) === 0)
	$_GET["page"] = $settings->defaultpage;

// Redirect the user to the safe version of the path if they entered an unsafe character
if(makepathsafe($_GET["page"]) !== $_GET["page"])
{
	http_response_code(301);
	header("location: index.php?action=" . rawurlencode($_GET["action"]) . "&page=" . makepathsafe($_GET["page"]));
	header("x-requested-page: " . $_GET["page"]);
	header("x-actual-page: " . makepathsafe($_GET["page"]));
	exit();
}


////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
//////////////////////////////// HTML fragments ////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
class page_renderer
{
	public static $html_template = "<!DOCTYPE html>
<html>
	<head>
		<meta charset='utf-8' />
		<title>{title}</title>
		<meta name='viewport' content='width=device-width, initial-scale=1' />
		<link rel='shortcut-icon' href='{favicon-url}' />
		<link rel='icon' href='{favicon-url}' />
		{header-html}
	</head>
	<body>
		{body}
		<!-- Took {generation-time-taken}ms to generate -->
	</body>
</html>
";

	public static $main_content_template = "{navigation-bar}
		<h1 class='sitename'>{sitename}</h1>
		<main>
		{content}
		</main>

		<footer>
			<p>{footer-message}</p>
			<p>Powered by Pepperminty Wiki v0.13-dev, which was built by <a href='//starbeamrainbowlabs.com/'>Starbeamrainbowlabs</a>. Send bugs to 'bugs at starbeamrainbowlabs dot com' or <a href='//github.com/sbrl/Pepperminty-Wiki' title='Github Issue Tracker'>open an issue</a>.</p>
			<p>Your local friendly administrators are {admins-name-list}.</p>
			<p>This wiki is managed by <a href='mailto:{admin-details-email}'>{admin-details-name}</a>.</p>
		</footer>
		{navigation-bar-bottom}
		{all-pages-datalist}";
	public static $minimal_content_template = "<main class='printable'>{content}</main>
		<footer class='printable'>
			<hr class='footerdivider' />
			<p><em>From {sitename}, which is managed by {admin-details-name}.</em></p>
			<p>{footer-message}</p>
			<p><em>Timed at {generation-date}</em></p>
			<p><em>Powered by Pepperminty Wiki v0.13-dev.</em></p>
		</footer>";

	// An array of functions that have been registered to process the
	// find / replace array before the page is rendered. Note that the function
	// should take a *reference* to an array as its only argument.
	protected static $part_processors = [];

	// Registers a function as a part post processor.
	public static function register_part_preprocessor($function)
	{
		global $settings;

		// Make sure that the function we are about to register is valid
		if(!is_callable($function))
		{
			http_response_code(500);
			$admin_name = $settings->admindetails_name;
			$admin_email = hide_email($settings->admindetails_email);
			exit(page_renderer::render("$settings->sitename - Module Error", "<p>$settings->sitename has got a misbehaving module installed that tried to register an invalid HTML handler with the page renderer. Please contact $settings->sitename's administrator $admin_name at <a href='mailto:$admin_email'>$admin_email</a>."));
		}

		self::$part_processors[] = $function;

		return true;
	}

	public static function render($title, $content, $body_template = false)
	{
		global $settings, $start_time, $version;

		if($body_template === false)
			$body_template = self::$main_content_template;

		if(strlen($settings->logo_url) > 0)
		{
			// A logo url has been specified
			$logo_html = "<img class='logo" . (isset($_GET["printable"]) ? " small" : "") . "' src='$settings->logo_url' />";
			switch($settings->logo_position)
			{
				case "left":
					$logo_html = "$logo_html $settings->sitename";
					break;
				case "right":
					$logo_html .= " $settings->sitename";
					break;
				default:
					throw new Exception("Invalid logo_position '$settings->logo_position'. Valid values are either \"left\" or \"right\" and are case sensitive.");
			}
		}

		$parts = [
			"{body}" => $body_template,

			"{sitename}" => $logo_html,
			"v0.13-dev" => $version,
			"{favicon-url}" => $settings->favicon,
			"{header-html}" => self::get_header_html(),

			"{navigation-bar}" => self::render_navigation_bar($settings->nav_links, $settings->nav_links_extra, "top"),
			"{navigation-bar-bottom}" => self::render_navigation_bar($settings->nav_links_bottom, [], "bottom"),

			"{admin-details-name}" => $settings->admindetails_name,
			"{admin-details-email}" => $settings->admindetails_email,

			"{admins-name-list}" => implode(", ", $settings->admins),

			"{generation-date}" => date("l jS \of F Y \a\\t h:ia T"),

			"{all-pages-datalist}" => self::generate_all_pages_datalist(),

			"{footer-message}" => $settings->footer_message,

			/// Secondary Parts ///

			"{content}" => $content,
			"{title}" => $title,
		];

		// Pass the parts through the part processors
		foreach(self::$part_processors as $function)
		{
			$function($parts);
		}

		$result = self::$html_template;

		$result = str_replace(array_keys($parts), array_values($parts), $result);

		$result = str_replace("{generation-time-taken}", round((microtime(true) - $start_time)*1000, 2), $result);
		return $result;
	}
	public static function render_main($title, $content)
	{
		return self::render($title, $content, self::$main_content_template);
	}
	public static function render_minimal($title, $content)
	{
		return self::render($title, $content, self::$minimal_content_template);
	}
	
	public static function get_header_html()
	{
		global $settings;
		$result = self::get_css_as_html();
		$result .= self::getJS();
		
		if(module_exists("feature-search"))
			$result .= "\t\t<link type='application/opensearchdescription+xml' rel='search' href='?action=opensearch-description' />\n";
		
		if(!empty($settings->enable_math_rendering))
		{
			$result .= "<script type='text/x-mathjax-config'>
		MathJax.Hub.Config({
		tex2jax: {
		inlineMath: [ ['$','$'], ['\\\\(','\\\\)'] ],
		processEscapes: true,
		skipTags: ['script','noscript','style','textarea','pre','code']
		}
		});
	</script>";
		}
		
		return $result;
	}
	public static function get_css_as_html()
	{
		global $settings;

		if(preg_match("/^[^\/]*\/\/|^\//", $settings->css))
			return "<link rel='stylesheet' href='$settings->css' />\n";
		else
		{
			$css = $settings->css;
			if(!empty($settings->optimize_pages))
			{
				// CSS Minification ideas by Jean from catswhocode.com
				// Link: http://www.catswhocode.com/blog/3-ways-to-compress-css-files-using-php
				// Remove comments
				$css = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', "", $css);
				// Cut down whitespace
				$css = preg_replace('/\s+/', " ", $css);
				// Remove whitespace after colons and semicolons
				$css = str_replace([
					" :",
					": ",
					"; ",
					" { ",
					" } "
				], [
					":",
					":",
					";",
					"{",
					"}"
				], $css);
				
			}
			return "<style>$css</style>\n";
		}
	}
	
	private static $jsSnippets = [];
	private static $jsLinks = [];
	public function AddJSLink(string $scriptUrl)
	{
		static::$jsLinks[] = $scriptUrl;
	}
	public function AddJSSnippet(string $script)
	{
		static::$jsSnippets[] = $script;
	}
	
	private static function getJS()
	{
		$result = "<!-- Javascript -->\n";
		foreach(static::$jsSnippets as $snippet)
			$result .= "<script defer>\n$snippet\n</script>\n";
		foreach(static::$jsLinks as $link)
			$result .= "<script src='" . $link . "' defer></script>\n";
		return $result;
	}
	
	// ~

	public static $nav_divider = "<span class='nav-divider inflexible'> | </span>";

	/**
	 * Renders a navigation bar from an array of links. See
	 * $settings->nav_links for format information.
	 * @param array	$nav_links			The links to add to the navigation bar.
	 * @param array	$nav_links_extra	The extra nav links to add to
	 *                               	the "More..." menu.
	 */
	public static function render_navigation_bar($nav_links, $nav_links_extra, $class = "")
	{
		global $settings, $env;
		$result = "<nav class='$class'>\n";

		// Loop over all the navigation links
		foreach($nav_links as $item)
		{
			if(is_string($item))
			{
				// The item is a string
				switch($item)
				{
					//keywords
					case "user-status": // Renders the user status box
						if($env->is_logged_in)
						{
							$result .= "<span class='inflexible logged-in" . ($env->is_logged_in ? " moderator" : " normal-user") . "'>" . self::render_username($env->user) . " <small>(<a href='index.php?action=logout'>Logout</a>)</small></span>";
							//$result .= page_renderer::$nav_divider;
						}
						else
							$result .= "<span class='not-logged-in'><a href='index.php?action=login&returnto=" . rawurlencode($_SERVER["REQUEST_URI"]) . "'>Login</a></span>";
						break;

					case "search": // Renders the search bar
						$result .= "<span class='inflexible'><form method='get' action='index.php' style='display: inline;'><input type='search' name='page' list='allpages' placeholder='Type a page name here and hit enter' /><input type='hidden' name='search-redirect' value='true' /></form></span>";
						break;

					case "divider": // Renders a divider
						$result .= page_renderer::$nav_divider;
						break;

					case "menu": // Renders the "More..." menu
						$result .= "<span class='inflexible nav-more'><label for='more-menu-toggler'>More...</label>
<input type='checkbox' class='off-screen' id='more-menu-toggler' />";
						$result .= page_renderer::render_navigation_bar($nav_links_extra, [], "nav-more-menu");
						$result .= "</span>";
						break;

					// It isn't a keyword, so just output it directly
					default:
						$result .= "<span>$item</span>";
				}
			}
			else
			{
				// Output the item as a link to a url
				$result .= "<span><a href='" . str_replace("{page}", rawurlencode($env->page), $item[1]) . "'>$item[0]</a></span>";
			}
		}

		$result .= "</nav>";
		return $result;
	}
	public static function render_username($name)
	{
		global $settings;
		$result = "";
		if(in_array($name, $settings->admins))
			$result .= $settings->admindisplaychar;
		$result .= $name;

		return $result;
	}
	
	// ~

	public static function generate_all_pages_datalist()
	{
		global $settings, $pageindex;
		$arrayPageIndex = get_object_vars($pageindex);
		ksort($arrayPageIndex);
		$result = "<datalist id='allpages'>\n";
		
		// If dynamic page sugggestions are enabled, then we should send a loading message instead.
		if($settings->dynamic_page_suggestion_count > 0)
		{
			$result .= "<option value='Loading suggestions...' />";
		}
		else
		{
			foreach($arrayPageIndex as $pagename => $pagedetails)
			{
				$escapedPageName = str_replace('"', '&quot;', $pagename);
				$result .= "\t\t\t<option value=\"$escapedPageName\" />\n";
			}
		}
		$result .= "\t\t</datalist>";

		return $result;
	}
}

// Math rendering support
if(!empty($settings->enable_math_rendering))
{
	page_renderer::AddJSLink("https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-MML-AM_CHTML");
}
// alt+enter suport in the search box
page_renderer::AddJSSnippet('// Alt + Enter support in the top search box
window.addEventListener("load", function(event) {
	document.querySelector("input[type=search]").addEventListener("keyup", function(event) {
		// Listen for Alt + Enter
		if(event.keyCode == 13 && event.altKey) {
			event.target.form.setAttribute("target", "_blank");
			event.target.form.submit();
			event.target.form.removeAttribute("target");
		}
	});
});
');

/// Finish setting up the environment object ///
$env->page = $_GET["page"];
if(isset($_GET["revision"]) and is_numeric($_GET["revision"]))
{
	// We have a revision number!
	$env->is_history_revision = true;
	$env->history->revision_number = intval($_GET["revision"]);
	
	// Make sure that the revision exists for later on
	if(!isset($pageindex->{$env->page}->history[$env->history->revision_number]))
	{
		http_response_code(404);
		exit(page_renderer::render_main("404: Revision Not Found - $env->page - $settings->sitename", "<p>Revision #{$env->history->revision_number} of $env->page doesn't appear to exist. Try viewing the <a href='?action=history&page=" . rawurlencode($env->page) . "'>list of revisions for $env->page</a>, or viewing <a href='?page=" . rawurlencode($env->page) . "'>the latest revision</a> instead.</p>"));
	}
	
	$env->history->revision_data = $pageindex->{$env->page}->history[$env->history->revision_number];
}
// Construct the page's filename
$env->page_filename = $env->storage_prefix;
if($env->is_history_revision)
	$env->page_filename .= $pageindex->{$env->page}->history[$env->history->revision_number]->filename;
else if(isset($pageindex->{$env->page}))
	$env->page_filename .= $pageindex->{$env->page}->filename;

$env->action = strtolower($_GET["action"]);

////////////////////////////////////////////////

//////////////////////////////////////
///// Extra consistency measures /////
//////////////////////////////////////
// Redirect to the search page if there isn't a page with the requested name
if(!isset($pageindex->{$env->page}) and isset($_GET["search-redirect"]))
{
	http_response_code(307);
	$url = "?action=search&query=" . rawurlencode($env->page);
	header("location: $url");
	exit(page_renderer::render("Non existent page - $settings->sitename", "<p>There isn't a page on $settings->sitename with that name. However, you could <a href='$url'>search for this page name</a> in other pages.</p>
		<p>Alternatively, you could <a href='?action=edit&page=" . rawurlencode($env->page) . "&create=true'>create this page</a>.</p>"));
}

// Redirect the user to the login page if:
//  - A login is required to view this wiki
//  - The user isn't already requesting the login page
// Note we use $_GET here because $env->action isn't populated at this point
if($settings->require_login_view === true && // If this site requires a login in order to view pages
   !$env->is_logged_in && // And the user isn't logged in
   !in_array($_GET["action"], [ "login", "checklogin" ])) // And the user isn't trying to login
{
	// Redirect the user to the login page
	http_response_code(307);
	$url = "?action=login&returnto=" . rawurlencode($_SERVER["REQUEST_URI"]) . "&required=true";
	header("location: $url");
	exit(page_renderer::render("Login required - $settings->sitename", "<p>$settings->sitename requires that you login before you are able to access it.</p>
		<p><a href='$url'>Login</a>.</p>"));
}
//////////////////////////////////////
//////////////////////////////////////

//////////////////////////
///  Module functions  ///
//////////////////////////
// These functions are	//
// used by modules to	//
// register themselves	//
// or new pages.		//
//////////////////////////
$modules = []; // List that contains all the loaded modules
// Function to register a module
function register_module($moduledata)
{
	global $modules;
	//echo("registering module\n");
	//var_dump($moduledata);
	$modules[] = $moduledata;
}
/**
 * Checks to see whether a module with the given id exists.
 * @param  string   $id	 The id to search for.
 * @return bool     Whether a module is currently loaded with the given id.
 */
function module_exists($id)
{
	global $modules;
	foreach($modules as $module)
	{
		if($module["id"] == $id)
			return true;
	}
	return false;
}

// Function to register an action handler
$actions = new stdClass();
function add_action($action_name, $func)
{
	global $actions;
	$actions->$action_name = $func;
}

$parsers = [
	"none" => function() {
		throw new Exception("No parser registered!");
	}
];
/**
 * Registers a new parser.
 * @param string	$name       	The name of the new parser to register.
 * @param function	$parser_code	The function to register as a new parser.
 */
function add_parser($name, $parser_code)
{
	global $parsers;
	if(isset($parsers[$name]))
		throw new Exception("Can't register parser with name '$name' because a parser with that name already exists.");

	$parsers[$name] = $parser_code;
}
function parse_page_source($source)
{
	global $settings, $parsers;
	if(!isset($parsers[$settings->parser]))
		exit(page_renderer::render_main("Parsing error - $settings->sitename", "<p>Parsing some page source data failed. This is most likely because $settings->sitename has the parser setting set incorrectly. Please contact <a href='mailto:" . hide_email($settings->admindetails_email) . "'>" . $settings->admindetails_name . "</a>, your $settings->sitename Administrator."));

/* Not needed atm because escaping happens when saving, not when rendering *
	if($settings->clean_raw_html)
		$source = htmlentities($source, ENT_QUOTES | ENT_HTML5);
*/
	return $parsers[$settings->parser]($source);
}

// Function to 
$save_preprocessors = [];
/**
 * Register a new proprocessor that will be executed just before
 * an edit is saved.
 * @param	function	$func	The function to register.
 */
function register_save_preprocessor($func)
{
	global $save_preprocessors;
	$save_preprocessors[] = $func;
}

$help_sections = [];
/**
 * Adds a new help section to the help page.
 * @param string $index   The string to index the new section under.
 * @param string $title   The title to display above the section.
 * @param string $content The content to display.
 */
function add_help_section($index, $title, $content)
{
	global $help_sections;
	
	$help_sections[$index] = [
		"title" => $title,
		"content" => $content
	];
}

if(!empty($settings->enable_math_rendering))
	add_help_section("22-Mathematical-Expressions", "Methematical Expressions", "<p>$settings->sitename supports rendering of mathematical expressions. Mathematical expressions can be included practically anywhere in your page. Expressions should be written in LaTeX and enclosed in dollar signs like this: <code>&#36;x^2&#36;</code>.</p>
	<p>Note that expression parsing is done on the viewer's computer with javascript (specifically MathJax) and not by $settings->sitename directly (also called client side rendering).</p>");

//////////////////////////////////////////////////////////////////


register_module([
	"name" => "Password hashing action",
	"version" => "0.6",
	"author" => "Starbeamrainbowlabs",
	"description" => "Adds a utility action (that anyone can use) called hash that hashes a given string. Useful when changing a user's password.",
	"id" => "action-hash",
	"code" => function() {
		/**
		 * @api {get} ?action=hash&string={text} Hash a password
		 * @apiName Hash
		 * @apiGroup Utility
		 * @apiPermission Anonymous
		 * 
		 * @apiParam {string}	string	The string to hash.
		 * @apiParam {boolean}	raw		Whether to return the hashed password as a raw string instead of as part of an HTML page.
		 *
		 * @apiError	ParamNotFound	The string parameter was not specified.
		 */
		
		/*
		 * ██   ██  █████  ███████ ██   ██ 
		 * ██   ██ ██   ██ ██      ██   ██ 
		 * ███████ ███████ ███████ ███████ 
		 * ██   ██ ██   ██      ██ ██   ██ 
		 * ██   ██ ██   ██ ███████ ██   ██
		 */
		add_action("hash", function() {
			global $settings;
			
			if(!isset($_GET["string"]))
			{
				http_response_code(422);
				exit(page_renderer::render_main("Missing parameter", "<p>The <code>GET</code> parameter <code>string</code> must be specified.</p>
		<p>It is strongly recommended that you utilise this page via a private or incognito window in order to prevent your password from appearing in your browser history.</p>"));
			}
			else if(!empty($_GET["raw"]))
			{
				header("content-type: text/plain");
				exit(hash_password($_GET["string"]));
			}
			else
			{
				exit(page_renderer::render_main("Hashed string", "<p>Algorithm: " . ($settings->use_sha3 ? "sha3" : "sha256") . "</p>\n<p><code>" . $_GET["string"] . "</code> → <code>" . hash_password($_GET["string"]) . "</code></p>"));
			}
		});
	}
]);




register_module([
	"name" => "Page protection",
	"version" => "0.2",
	"author" => "Starbeamrainbowlabs",
	"description" => "Exposes Pepperminty Wiki's new page protection mechanism and makes the protect button in the 'More...' menu on the top bar work.",
	"id" => "action-protect",
	"code" => function() {
		/**
		 * @api {get} ?action=protect&page={pageName} Toggle the protection of a page.
		 * @apiName Protect
		 * @apiGroup Page
		 * @apiPermission Moderator
		 * 
		 * @apiParam {string}	page	The page name to toggle the protection of.
		 */
		
		/*
		 * ██████  ██████   ██████  ████████ ███████  ██████ ████████ 
		 * ██   ██ ██   ██ ██    ██    ██    ██      ██         ██    
		 * ██████  ██████  ██    ██    ██    █████   ██         ██    
		 * ██      ██   ██ ██    ██    ██    ██      ██         ██    
		 * ██      ██   ██  ██████     ██    ███████  ██████    ██    
		 */
		add_action("protect", function() {
			global $env, $pageindex, $paths, $settings;

			// Make sure that the user is logged in as an admin / mod.
			if($env->is_admin)
			{
				// They check out ok, toggle the page's protection.
				$page = $env->page;
				
				if(!isset($pageindex->$page->protect))
				{
					$pageindex->$page->protect = true;
				}
				else if($pageindex->$page->protect === true)
				{
					$pageindex->$page->protect = false;
				}
				else if($pageindex->$page->protect === false)
				{
					$pageindex->$page->protect = true;
				}
				
				// Save the pageindex
				file_put_contents($paths->pageindex, json_encode($pageindex, JSON_PRETTY_PRINT));
				
				$state = ($pageindex->$page->protect ? "enabled" : "disabled");
				$title = "Page protection $state.";
				exit(page_renderer::render_main($title, "<p>Page protection for $env->page has been $state.</p><p><a href='?action=$settings->defaultaction&page=$env->page'>Go back</a>."));
			}
			else
			{
				exit(page_renderer::render_main("Error protecting page", "<p>You are not allowed to protect pages because you are not logged in as a mod or admin. Please try logging out if you are logged in and then try logging in as an administrator.</p>"));
			}
		});
	}
]);




register_module([
	"name" => "Random Page",
	"version" => "0.1",
	"author" => "Starbeamrainbowlabs",
	"description" => "Adds an action called 'random' that redirects you to a random page.",
	"id" => "action-random",
	"code" => function() {
		global $settings;
		/**
		 * @api {get} ?action=random Redirects to a random page.
		 * @apiName RawSource
		 * @apiGroup Page
		 * @apiPermission Anonymous
		 */
		
		add_action("random", function() {
			global $pageindex;
			
			$pageNames = array_keys(get_object_vars($pageindex));
			$randomPageName = $pageNames[array_rand($pageNames)];
			
			http_response_code(307);
			header("location: ?page=" . rawurlencode($randomPageName));
		});
		
		add_help_section("26-random-redirect", "Jumping to a random page", "<p>$settings->sitename has a function that can send you to a random page. To use it, click <a href='?action=random'>here</a>.</p>");
	}
]);




register_module([
	"name" => "Raw page source",
	"version" => "0.7",
	"author" => "Starbeamrainbowlabs",
	"description" => "Adds a 'raw' action that shows you the raw source of a page.",
	"id" => "action-raw",
	"code" => function() {
		global $settings;
		/**
		 * @api {get} ?action=raw&page={pageName} Get the raw source code of a page
		 * @apiName RawSource
		 * @apiGroup Page
		 * @apiPermission Anonymous
		 * 
		 * @apiParam {string}	page	The page to return the source of.
		 */
		
		/*
		 * ██████   █████  ██     ██ 
		 * ██   ██ ██   ██ ██     ██ 
		 * ██████  ███████ ██  █  ██ 
		 * ██   ██ ██   ██ ██ ███ ██ 
		 * ██   ██ ██   ██  ███ ███  
		 */
		add_action("raw", function() {
			global $env;
			
			header("content-type: text/markdown");
			exit(file_get_contents($env->page_filename));
		});
		
		add_help_section("800-raw-page-content", "Viewing Raw Page Content", "<p>Although you can use the edit page to view a page's source, you can also ask $settings->sitename to send you the raw page source and nothing else. This feature is intented for those who want to automate their interaction with $settings->sitename.</p>
		<p>To use this feature, navigate to the page for which you want to see the source, and then alter the <code>action</code> parameter in the url's query string to be <code>raw</code>. If the <code>action</code> parameter doesn't exist, add it. Note that when used on an file's page this action will return the source of the description and not the file itself.</p>");
	}
]);




register_module([
	"name" => "Sidebar",
	"version" => "0.3",
	"author" => "Starbeamrainbowlabs",
	"description" => "Adds a sidebar to the left hand side of every page. Add '\$settings->sidebar_show = true;' to your configuration, or append '&sidebar=yes' to the url to enable. Adding to the url sets a cookie to remember your setting.",
	"id" => "extra-sidebar",
	"code" => function() {
		global $settings;
		
		$show_sidebar = false;
		
		// Show the sidebar if it is enabled in the settings
		if(isset($settings->sidebar_show) && $settings->sidebar_show === true)
			$show_sidebar = true;
		
		// Also show and persist the sidebar if the special GET parameter
		// sidebar is seet
		if(!$show_sidebar && isset($_GET["sidebar"]))
		{
			$show_sidebar = true;
			// Set a cookie to persist the display of the sidebar
			setcookie("sidebar_show", "true", time() + (60 * 60 * 24 * 30));
		}
		
		// Show the sidebar if the cookie is set
		if(!$show_sidebar && isset($_COOKIE["sidebar_show"]))
			$show_sidebar = true;
		
		// Delete the cookie and hide the sidebar if the special GET paramter
		// nosidebar is set
		if(isset($_GET["nosidebar"]))
		{
			$show_sidebar = false;
			unset($_COOKIE["sidebar_show"]);
			setcookie("sidebar_show", null, time() - 3600);
		}
		
		page_renderer::register_part_preprocessor(function(&$parts) use ($show_sidebar) {
			global $settings, $pageindex, $env;
			
			// Don't render a sidebar if the user is logging in and a login is
			// required in order to view pages.
			if($settings->require_login_view && in_array($env->action, [ "login", "checklogin" ]))
				return false;
			
			if($show_sidebar && !isset($_GET["printable"]))
			{
				// Show the sidebar
				$exec_start = microtime(true);
				
				// Sort the pageindex
				$sorted_pageindex = get_object_vars($pageindex);
				ksort($sorted_pageindex, SORT_NATURAL);
				
				$sidebar_contents = "";
				$sidebar_contents .= render_sidebar($sorted_pageindex);
				
				$parts["{body}"] = "<aside class='sidebar'>
			$sidebar_contents
			<!-- Sidebar rendered in " . (microtime(true) - $exec_start) . "s -->
		</aside>
		<div class='main-container'>" . $parts["{body}"] . "</div>
		<!-------------->
		<style>
			body { display: flex; }
			.main-container { flex: 1; }
		</style>";
			}
		});
		
		add_help_section("50-sidebar", "Sidebar", "<p>$settings->sitename has an optional sidebar which displays a list of all the current pages (but not subpages) that it is currently hosting. It may or may not be enabled.</p>
		<p>If it isn't enabled, it can be enabled for your current browser only by appending <code>sidebar=yes</code> to the current page's query string.</p>");
	}
]);

/* 
 * @summary Renders the sidebar for a given pageindex.
 * 
 * @param $pageindex {array} - The pageindex to render the sidebar for
 * @param $root_pagename {string} - The pagename that should be considered the root of the rendering. You don't usually need to use this, it is used by the algorithm itself since it is recursive.
 * 
 * @returns {string} A HTML rendering of the sidebar for the given pageindex
 */
function render_sidebar($pageindex, $root_pagename = "")
{
	global $settings;
	
	$result = "<ul";
	// If this is the very root of the tree, add an extra class to it
	if($root_pagename == "") $result .= " class='sidebar-tree'";
	$result .=">";
	foreach ($pageindex as $pagename => $details)
	{
		// If we have a valid root pagename, and it isn't present at the
		// beginning of the current pagename, skip it
		if($root_pagename !== "" && strpos($pagename, $root_pagename) !== 0)
			continue;
		
		// The current page is the same as the root page, skip it
		if($pagename == $root_pagename)
			continue;
		
		
		// If the part of the current pagename that comes after the root
		// pagename has a slash in it, skip it as it is a sub-sub page.
		if(strpos(substr($pagename, strlen($root_pagename)), "/") !== false)
			continue;
		
		$result .= "<li><a href='?action=$settings->defaultaction&page=$pagename'>$pagename</a>\n";
		$result .= render_sidebar($pageindex, $pagename);
		$result .= "</li>\n";
	}
	$result .= "</ul>\n";
	
	return $result == "<ul></ul>\n" ? "" : $result;
}




register_module([
	"name" => "Settings GUI",
	"version" => "0.1",
	"author" => "Starbeamrainbowlabs",
	"description" => "The module everyone has been waiting for! Adds a web based gui that lets mods change the wiki settings.",
	"id" => "feature-guiconfig",
	"code" => function() {
		global $settings;
		/**
		 * @api {get} ?action=configure Get a page to change the global wiki settings
		 * @apiName ConfigureSettings
		 * @apiGroup Utility
		 * @apiPermission Moderator
		 */
		
		/*
		 *  ██████  ██████  ███    ██ ███████ ██  ██████  ██    ██ ██████  ███████
		 * ██      ██    ██ ████   ██ ██      ██ ██       ██    ██ ██   ██ ██
		 * ██      ██    ██ ██ ██  ██ █████   ██ ██   ███ ██    ██ ██████  █████
		 * ██      ██    ██ ██  ██ ██ ██      ██ ██    ██ ██    ██ ██   ██ ██
		 *  ██████  ██████  ██   ████ ██      ██  ██████   ██████  ██   ██ ███████
 	 	 */
		add_action("configure", function() {
			global $settings, $env, $guiConfig;
			
			if(!$env->is_admin)
			{
				$errorMessage = "<p>You don't have permission to change $settings->sitename's master settings.</p>\n";
				if(!$env->is_logged_in)
					$errorMessage .= "<p>You could try <a href='?action=login&returnto=%3Faction%3Dconfigure'>logging in</a>.</p>";
				else
					$errorMessage .= "<p>You could try <a href='?action=logout&returnto=%3Faction%3Dconfigure'>logging out</a> and then <a href='?action=login&returnto=%3Faction%3Dconfigure'>logging in</a> again with a different account that has the appropriate privileges.</a>.</p>";
				exit(page_renderer::render_main("Error - $settings->sitename", $errorMessage));
			}
			
			$content = "<h1>Master Control Panel</h1>\n";
			$content .= "<p>This page lets you configure the site settings. Please be careful - you can break things easily on this page if you're not careful!</p>\n";
			$content .= "<form action='?action=configure-save' method='post'>\n";
			
			foreach($guiConfig as $configKey => $configData)
			{
				// Don't display the site secret~!
				// Apparently it got lost in translation, but I'll be re-adding
				// it again at some point I'm sure - so support for it is
				// included here.
				if($configKey == "sitesecret") continue;
				
				$reverse = false;
				$inputControl = "";
				$label = "<label for='setting-$configKey' title=\"$configData->description\" class='cursor-query'>$configKey</label>";
				switch($configData->type)
				{
					case "url":
					case "email":
					case "number":
					case "text":
						$inputControl = "<input type='$configData->type' id='$configKey' name='$configKey' value='{$settings->$configKey}' />";
						break;
					case "textarea":
						$inputControl = "<textarea id='$configKey' name='$configKey'>{$settings->$configKey}</textarea>";
						break;
					case "checkbox":
						$reverse = true;
						$inputControl = "<input type='checkbox' id='$configKey' name='$configKey' " . ($settings->$configKey ? " checked" : "") . " />";
						break;
					default:
						$label = "";
						$inputControl = "<p><em>Sorry! The <code>$configKey</code> setting isn't editable yet through the gui. Please try editing <code>peppermint.json</code> for the time being.</em></p>";
						break;
				}
				
				$content .= "<div class='setting-configurator'>\n\t";
				$content .= $reverse ? "$inputControl\n\t$label" : "$label\n\t$inputControl";
				$content .= "\n</div>\n";
			}
			
			$content .= "<input type='submit' value='Save Settings' />";
			$content .= "</form>\n";
			
			exit(page_renderer::render_main("Master Control Panel - $settings->sitename", $content));
		});
		
		/**
		 * @api {post} ?action=configure-save Save changes to the global wiki settings
		 * @apiName ConfigureSettings
		 * @apiGroup Utility
		 * @apiPermission Moderator
		 */
		
		/*
		 *  ██████  ██████  ███    ██ ███████ ██  ██████  ██    ██ ██████  ███████
		 * ██      ██    ██ ████   ██ ██      ██ ██       ██    ██ ██   ██ ██
		 * ██      ██    ██ ██ ██  ██ █████   ██ ██   ███ ██    ██ ██████  █████ █████
		 * ██      ██    ██ ██  ██ ██ ██      ██ ██    ██ ██    ██ ██   ██ ██
		 *  ██████  ██████  ██   ████ ██      ██  ██████   ██████  ██   ██ ███████
		 * ███████  █████  ██    ██ ███████
		 * ██      ██   ██ ██    ██ ██
		 * ███████ ███████ ██    ██ █████
		 *      ██ ██   ██  ██  ██  ██
		 * ███████ ██   ██   ████   ███████
		 */
 		
		
		add_action("configure-save", function () {
			global $env, $settings, $defaultCSS;
			
		    // If the user isn't an admin, then the regular configuration page will display an appropriate error
			if(!$env->is_admin)
			{
				http_response_code(307);
				header("location: ?action=configure");
				exit();
			}
			
			// Build a new settings object
			$newSettings = new stdClass();
			foreach($settings as $configKey => $rawValue)
			{
				$configValue = $rawValue;
				if(isset($_POST[$configKey]))
				{
					$decodedConfigValue = json_decode($_POST[$configKey]);
					if(json_last_error() === JSON_ERROR_NONE)
						$configValue = $decodedConfigValue;
					else
						$configValue = $_POST[$configKey];
					
					// Convert boolean settings to a boolean, since POST
					// parameters don't decode correctly.
					if(is_bool($settings->$configKey))
						$configValue = in_array($configValue, [ 1, "on"], true) ? true : false;
					
					// If the CSS hasn't changed, then we can replace it with
					// 'auto' - this will ensure that upon update the new
					// default CSS will be used. Also make sure we ignore line
					// ending nonsense & differences here, since they really
					// don't matter
					if($configKey === "css" && str_replace("\r\n", "\n", $defaultCSS) === str_replace("\r\n", "\n", $configValue))
						$configValue = "auto";
				}
				
				$newSettings->$configKey = $configValue;
			}
			
			header("content-type: application/json");
			exit(json_encode($newSettings, JSON_PRETTY_PRINT));
		});
		
		add_help_section("800-raw-page-content", "Viewing Raw Page Content", "<p>Although you can use the edit page to view a page's source, you can also ask $settings->sitename to send you the raw page source and nothing else. This feature is intented for those who want to automate their interaction with $settings->sitename.</p>
		<p>To use this feature, navigate to the page for which you want to see the source, and then alter the <code>action</code> parameter in the url's query string to be <code>raw</code>. If the <code>action</code> parameter doesn't exist, add it. Note that when used on an file's page this action will return the source of the description and not the file itself.</p>");
	}
]);




register_module([
	"name" => "Page History",
	"version" => "0.3",
	"author" => "Starbeamrainbowlabs",
	"description" => "Adds the ability to keep unlimited page history, limited only by your disk space. Note that this doesn't store file history (yet). Currently depends on feature-recent-changes for rendering of the history page.",
	"id" => "feature-history",
	"code" => function() {
		/**
		 * @api {get} ?action=history&page={pageName} Get a list of revisions for a page
		 * @apiName History
		 * @apiGroup Page
		 * @apiPermission Anonymous
		 * 
		 * @apiParam {string}	page	The page name to return a revision list for.
		 */
		
		/*
		 * ██   ██ ██ ███████ ████████  ██████  ██████  ██    ██
		 * ██   ██ ██ ██         ██    ██    ██ ██   ██  ██  ██
		 * ███████ ██ ███████    ██    ██    ██ ██████    ████
		 * ██   ██ ██      ██    ██    ██    ██ ██   ██    ██
		 * ██   ██ ██ ███████    ██     ██████  ██   ██    ██
		 */
		add_action("history", function() {
			global $settings, $env, $pageindex;
			
			
			$content = "<h1>History for $env->page</h1>\n";
			if(!empty($pageindex->{$env->page}->history))
			{
				$content .= "\t\t<ul class='page-list'>\n";
				foreach(array_reverse($pageindex->{$env->page}->history) as $revisionData)
				{
					// Only display edits for now
					if($revisionData->type != "edit")
					continue;
					
					// The number (and the sign) of the size difference to display
					$size_display = ($revisionData->sizediff > 0 ? "+" : "") . $revisionData->sizediff;
					$size_display_class = $revisionData->sizediff > 0 ? "larger" : ($revisionData->sizediff < 0 ? "smaller" : "nochange");
					if($revisionData->sizediff > 500 or $revisionData->sizediff < -500)
					$size_display_class .= " significant";
					$size_title_display = human_filesize($revisionData->newsize - $revisionData->sizediff) . " -> " .  human_filesize($revisionData->newsize);
					
					$content .= "<li><a href='?page=" . rawurlencode($env->page) . "&revision=$revisionData->rid'>#$revisionData->rid</a> " . render_editor($revisionData->editor) . " " . render_timestamp($revisionData->timestamp) . " <span class='cursor-query $size_display_class' title='$size_title_display'>($size_display)</span>";
				}
			}
			else
			{
				$content .= "<p style='text-align: center;'><em>(None yet! Try editing this page and then coming back here.)</em></p>\n";
			}
			exit(page_renderer::render_main("$env->page - History - $settings->sitename", $content));
		});
		
		
		register_save_preprocessor("history_add_revision");
	}
]);

function history_add_revision(&$pageinfo, &$newsource, &$oldsource, $save_pageindex = true) {
	global $pageindex, $paths, $env;
	
	if(!isset($pageinfo->history))
		$pageinfo->history = [];
	
	// Save the *new source* as a revision
	// This results in 2 copies of the current source, but this is ok
	// since any time someone changes something, it create a new
	// revision
	// Note that we can't save the old source here because we'd have no
	// clue who edited it since $pageinfo has already been updated by
	// this point
	
	// TODO Store tag changes here
	$nextRid = count($pageinfo->history); // The next revision id
	$ridFilename = "$pageinfo->filename.r$nextRid";
	// Insert a new entry into the history
	$pageinfo->history[] = [
		"type" => "edit", // We might want to store other types later (e.g. page moves)
		"rid" => $nextRid,
		"timestamp" => time(),
		"filename" => $ridFilename,
		"newsize" => strlen($newsource),
		"sizediff" => strlen($newsource) - strlen($oldsource),
		"editor" => $pageinfo->lasteditor
	];
	
	// Save the new source as a revision
	file_put_contents("$env->storage_prefix$ridFilename", $newsource);
	
	// Save the edited pageindex
	if($save_pageindex)
		file_put_contents($paths->pageindex, json_encode($pageindex, JSON_PRETTY_PRINT));
}




register_module([
	"name" => "Recent Changes",
	"version" => "0.3.3",
	"author" => "Starbeamrainbowlabs",
	"description" => "Adds recent changes. Access through the 'recent-changes' action.",
	"id" => "feature-recent-changes",
	"code" => function() {
		global $settings, $env, $paths;
		/**
		 * @api {get} ?action=recentchanges Get a list of recent changes
		 * @apiName RecentChanges
		 * @apiGroup Stats
		 * @apiPermission Anonymous
		 */
		
		// Add the recent changes json file to $paths for convenience.
		$paths->recentchanges = $env->storage_prefix . "recent-changes.json";
		// Create the recent changes json file if it doesn't exist
		if(!file_exists($paths->recentchanges))
			file_put_contents($paths->recentchanges, "[]");
		
		/*
		 * ██████  ███████  ██████ ███████ ███    ██ ████████         
		 * ██   ██ ██      ██      ██      ████   ██    ██            
		 * ██████  █████   ██      █████   ██ ██  ██    ██            
		 * ██   ██ ██      ██      ██      ██  ██ ██    ██            
		 * ██   ██ ███████  ██████ ███████ ██   ████    ██            
		 * 
		 *  ██████ ██   ██  █████  ███    ██  ██████  ███████ ███████ 
		 * ██      ██   ██ ██   ██ ████   ██ ██       ██      ██      
		 * ██      ███████ ███████ ██ ██  ██ ██   ███ █████   ███████ 
		 * ██      ██   ██ ██   ██ ██  ██ ██ ██    ██ ██           ██ 
		 *  ██████ ██   ██ ██   ██ ██   ████  ██████  ███████ ███████
		 */
		add_action("recent-changes", function() {
			global $settings, $paths, $pageindex;
			
			$content = "\t\t<h1>Recent Changes</h1>\n";
			
			$recent_changes = json_decode(file_get_contents($paths->recentchanges));
			
			if(count($recent_changes) > 0)
			{
				$content .= render_recent_changes($recent_changes);
			}
			else
			{
				// No changes yet :(
				$content .= "<p><em>None yet! Try making a few changes and then check back here.</em></p>\n";
			}
			
			exit(page_renderer::render("Recent Changes - $settings->sitename", $content));
		});
		
		register_save_preprocessor(function(&$pageinfo, &$newsource, &$oldsource) {
			global $env, $settings, $paths;
			
			// Work out the old and new page lengths
			$oldsize = strlen($oldsource);
			$newsize = strlen($newsource);
			// Calculate the page length difference
			$size_diff = $newsize - $oldsize;
			
			$newchange = [
				"type" => "edit",
				"timestamp" => time(),
				"page" => $env->page,
				"user" => $env->user,
				"newsize" => $newsize,
				"sizediff" => $size_diff
			];
			if($oldsize == 0)
				$newchange["newpage"] = true;
			
			add_recent_change($newchange);
		});
		
		add_help_section("800-raw-page-content", "Recent Changes", "<p>The <a href='?action=recent-changes'>recent changes</a> page displays a list of all the most recent changes that have happened around $settings->sitename, arranged in chronological order. It can be found in the \"More...\" menu in the top right by default.</p>
		<p>Each entry displays the name of the page in question, who edited it, how long ago they did so, and the number of characters added or removed. Pages that <em>currently</em> redirect to another page are shown in italics, and hovering over the time since the edit wil show the exact time that the edit was made.</p>");
	}
]);

/**
 * Adds a new recent change to the recent changes file.
 * @param array $rchange The new change to add.
 */
function add_recent_change($rchange)
{
	global $settings, $paths;
	
	$recentchanges = json_decode(file_get_contents($paths->recentchanges), true);
	array_unshift($recentchanges, $rchange);
	
	// Limit the number of entries in the recent changes file if we've
	// been asked to.
	if(isset($settings->max_recent_changes))
		$recentchanges = array_slice($recentchanges, 0, $settings->max_recent_changes);
	
	// Save the recent changes file back to disk
	file_put_contents($paths->recentchanges, json_encode($recentchanges, JSON_PRETTY_PRINT));
}

function render_recent_changes($recent_changes)
{
	global $pageindex;
	
	// Cache the number of recent changes we are dealing with
	$rchange_count = count($recent_changes);
	
	// Group changes made on the same page and the same day together
	for($i = 0; $i < $rchange_count; $i++)
	{
		for($s = $i + 1; $s < $rchange_count; $s++)
		{
			// Break out if we have reached the end of the day we are scanning
			if(date("dmY", $recent_changes[$i]->timestamp) !== date("dmY", $recent_changes[$s]->timestamp))
				break;
			
			// If we have found a change that has been made on the same page and
			// on the same day as the one that we are scanning for, move it up
			// next to the change we are scanning for.
			if($recent_changes[$i]->page == $recent_changes[$s]->page &&
				date("j", $recent_changes[$i]->timestamp) === date("j", $recent_changes[$s]->timestamp))
			{
				// FUTURE: We may need to remove and insert instead of swapping changes around if this causes some changes to appear out of order.
				$temp = $recent_changes[$i + 1];
				$recent_changes[$i + 1] = $recent_changes[$s];
				$recent_changes[$s] = $temp;
				$i++;
			}
		}
	}
	
	$content = "<ul class='page-list'>\n";
	$last_time = 0;
	for($i = 0; $i < $rchange_count; $i++)
	{
		$rchange = $recent_changes[$i];
		
		if($last_time !== date("dmY", $rchange->timestamp))
			$content .= "<li class='header'><h2>" . date("jS F", $rchange->timestamp) . "</h2></li>\n";
		
		$rchange_results = [];
		for($s = $i; $s < $rchange_count; $s++)
		{
			if($recent_changes[$s]->page !== $rchange->page)
				break;
			
			$rchange_results[$s] = render_recent_change($recent_changes[$s]);
			$i++;
		}
		// Take one from i to account for when we tick over to the next
		// iteration of the main loop
		$i -= 1;
		
		$next_entry = implode("\n", $rchange_results);
		// If the change count is greater than 1, then we should enclose it
		// in a <details /> tag.
		if(count($rchange_results) > 1)
		{
			reset($rchange_results);
			$rchange_first = $recent_changes[key($rchange_results)];
			end($rchange_results);
			$rchange_last = $recent_changes[key($rchange_results)];
			
			$pageDisplayHtml = render_pagename($rchange_first);
			$timeDisplayHtml = render_timestamp($rchange_first->timestamp);
			$users = [];
			foreach($rchange_results as $key => $rchange_result)
			{
				if(!in_array($recent_changes[$key]->user, $users))
					$users[] = $recent_changes[$key]->user; 
			}
			$userDisplayHtml = render_editor(implode(", ", $users));
			
			$next_entry = "<li><details><summary><a href='?page=" . rawurlencode($rchange_first->page) . "'>$pageDisplayHtml</a> $userDisplayHtml $timeDisplayHtml</summary><ul class='page-list'>$next_entry</ul></details></li>";
			
			$content .= "$next_entry\n";
		}
		else
		{
			$content .= implode("\n", $rchange_results);
		}
		
		$last_time = date("dmY", $rchange->timestamp);
	}
	$content .= "\t\t</ul>";
	
	return $content;
}

function render_recent_change($rchange)
{
	global $pageindex;
	$pageDisplayHtml = render_pagename($rchange);
	$editorDisplayHtml = render_editor($rchange->user);
	$timeDisplayHtml = render_timestamp($rchange->timestamp);
	
	$revisionId = false;
	if(isset($pageindex->{$rchange->page}))
	{
		foreach($pageindex->{$rchange->page}->history as $historyEntry)
		{
			if($historyEntry->timestamp == $rchange->timestamp)
			{
				$revisionId = $historyEntry->rid;
				break;
			}
		}
	}
	
	$result = "";
	$resultClasses = [];
	switch(isset($rchange->type) ? $rchange->type : "edit")
	{
		case "edit":
			// The number (and the sign) of the size difference to display
			$size_display = ($rchange->sizediff > 0 ? "+" : "") . $rchange->sizediff;
			$size_display_class = $rchange->sizediff > 0 ? "larger" : ($rchange->sizediff < 0 ? "smaller" : "nochange");
			if($rchange->sizediff > 500 or $rchange->sizediff < -500)
				$size_display_class .= " significant";
			
			
			$size_title_display = human_filesize($rchange->newsize - $rchange->sizediff) . " -> " .  human_filesize($rchange->newsize);
			
			if(!empty($rchange->newpage))
				$resultClasses[] = "newpage";
			
			$result .= "<a href='?page=" . rawurlencode($rchange->page) . ($revisionId !== false ? "&revision=$revisionId" : "") . "'>$pageDisplayHtml</a> $editorDisplayHtml $timeDisplayHtml <span class='$size_display_class' title='$size_title_display'>($size_display)</span>";
			break;
		
		case "deletion":
			$resultClasses[] = "deletion";
			$result .= "$pageDisplayHtml $editorDisplayHtml $timeDisplayHtml";
			break;
		
		case "upload":
			$resultClasses[] = "upload";
			$result .= "<a href='?page=$rchange->page'>$pageDisplayHtml</a> $editorDisplayHtml $timeDisplayHtml (" . human_filesize($rchange->filesize) . ")";
			break;
	}
	
	$resultAttributes = " " . (count($resultClasses) > 0 ? "class='" . implode(" ", $resultClasses) . "'" : "");
	$result = "\t\t\t<li$resultAttributes>$result</li>\n";
	
	return $result;
}




register_module([
	"name" => "Redirect pages",
	"version" => "0.3",
	"author" => "Starbeamrainbowlabs",
	"description" => "Adds support for redirect pages. Uses the same syntax that Mediawiki does.",
	"id" => "feature-redirect",
	"code" => function() {
		global $settings;
		
		register_save_preprocessor(function(&$index_entry, &$pagedata) {
			$matches = [];
			if(preg_match("/^# ?REDIRECT ?\[\[([^\]]+)\]\]/i", $pagedata, $matches) === 1)
			{
				//error_log("matches: " . var_export($matches, true));
				// We have found a redirect page!
				// Update the metadata to reflect this.
				$index_entry->redirect = true;
				$index_entry->redirect_target = $matches[1];
			}
			else
			{
				// This page isn't a redirect. Unset the metadata just in case.
				if(isset($index_entry->redirect))
					unset($index_entry->redirect);
				if(isset($index_entry->redirect_target))
					unset($index_entry->redirect_target);
			}
		});
		
		// Register a help section
		add_help_section("25-redirect", "Redirect Pages", "<p>$settings->sitename supports redirect pages. To create a redirect page, enter something like <code># REDIRECT [[pagename]]</code> on the first line of the redirect page's content. This <em>must</em> appear as the first line of the page, with no whitespace before it. You can include content beneath the redirect if you want, too (such as a reason for redirecting the page).</p>");
	}
]);




register_module([
	"name" => "Search",
	"version" => "0.4",
	"author" => "Starbeamrainbowlabs",
	"description" => "Adds proper search functionality to Pepperminty Wiki using an inverted index to provide a full text search engine. If pages don't show up, then you might have hit a stop word. If not, try requesting the `invindex-rebuild` action to rebuild the inverted index from scratch.",
	"id" => "feature-search",
	"code" => function() {
		global $settings;
		
		/**
		 * @api {get} ?action=index&page={pageName} Get an index of words for a given page
		 * @apiName SearchIndex
		 * @apiGroup Search
		 * @apiPermission Anonymous
		 * 
		 * @apiParam {string}	page	The page to generate a word index page.
		 */
		
		/*
		 * ██ ███    ██ ██████  ███████ ██   ██ 
		 * ██ ████   ██ ██   ██ ██       ██ ██  
		 * ██ ██ ██  ██ ██   ██ █████     ███   
		 * ██ ██  ██ ██ ██   ██ ██       ██ ██  
		 * ██ ██   ████ ██████  ███████ ██   ██ 
		 */
		add_action("index", function() {
			global $settings, $env;
			
			$breakable_chars = "\r\n\t .,\\/!\"£$%^&*[]()+`_~#";
			
			header("content-type: text/plain");
			
			$source = file_get_contents("$env->storage_prefix$env->page.md");
			
			$index = search::index($source);
			
			var_dump($env->page);
			var_dump($source);
			
			var_dump($index);
		});
		
		/**
		 * @api {get} ?action=invindex-rebuild Rebuild the inverted search index from scratch
		 * @apiDescription	Causes the inverted search index to be completely rebuilt from scratch. Can take a while for large wikis!
		 * @apiName			SearchInvindexRebuild
		 * @apiGroup		Search
		 * @apiPermission	Anonymous
		 */
		
		/*
		 * ██ ███    ██ ██    ██ ██ ███    ██ ██████  ███████ ██   ██          
		 * ██ ████   ██ ██    ██ ██ ████   ██ ██   ██ ██       ██ ██           
		 * ██ ██ ██  ██ ██    ██ ██ ██ ██  ██ ██   ██ █████     ███  █████     
		 * ██ ██  ██ ██  ██  ██  ██ ██  ██ ██ ██   ██ ██       ██ ██           
		 * ██ ██   ████   ████   ██ ██   ████ ██████  ███████ ██   ██          
		 * 
		 * ██████  ███████ ██████  ██    ██ ██ ██      ██████                  
		 * ██   ██ ██      ██   ██ ██    ██ ██ ██      ██   ██                 
		 * ██████  █████   ██████  ██    ██ ██ ██      ██   ██                 
		 * ██   ██ ██      ██   ██ ██    ██ ██ ██      ██   ██                 
		 * ██   ██ ███████ ██████   ██████  ██ ███████ ██████                  
		 */
		add_action("invindex-rebuild", function() {
			search::rebuild_invindex();
		});
		
		
		/**
		 * @api {get} ?action=idindex-show Show the id index
		 * @apiDescription	Outputs the id index. Useful if you need to verify that it's working as expected.
		 * @apiName			SearchShowIdIndex
		 * @apiGroup		Search
		 * @apiPermission	Anonymous
		 */
		add_action("idindex-show", function() {
			global $idindex;
			header("content-type: application/json; charset=UTF-8");
			exit(json_encode($idindex, JSON_PRETTY_PRINT));
		});
		
		/**
		 * @api {get} ?action=search&query={text}	Search the wiki for a given query string
		 * @apiName Search
		 * @apiGroup Search
		 * @apiPermission Anonymous
		 * 
		 * @apiParam {string}	query	The query string to search for.
		 */
		
		/*
		 * ███████ ███████  █████  ██████   ██████ ██   ██ 
		 * ██      ██      ██   ██ ██   ██ ██      ██   ██ 
		 * ███████ █████   ███████ ██████  ██      ███████ 
		 *      ██ ██      ██   ██ ██   ██ ██      ██   ██ 
		 * ███████ ███████ ██   ██ ██   ██  ██████ ██   ██ 
		 */
		add_action("search", function() {
			global $settings, $env, $pageindex, $paths;
			
			// Create the inverted index if it doesn't exist.
			// todo In the future perhaps a CLI for this would be good?
			if(!file_exists($paths->searchindex))
				search::rebuild_invindex();
			
			if(!isset($_GET["query"]))
				exit(page_renderer::render("No Search Terms - Error - $settings->sitename", "<p>You didn't specify any search terms. Try typing some into the box above.</p>"));
			
			$search_start = microtime(true);
			
			$invindex = search::load_invindex($paths->searchindex);
			$results = search::query_invindex($_GET["query"], $invindex);
			$resultCount = count($results);

			$env->perfdata->search_time = round((microtime(true) - $search_start)*1000, 3);

			$title = $_GET["query"] . " - Search results - $settings->sitename";
			
			$content = "<section>\n";
			$content .= "<h1>Search Results</h1>";
			
			/// Search Box ///
			$content .= "<form method='get' action=''>\n";
			$content .= "	<input type='search' id='search-box' name='query' placeholder='Type your query here and then press enter.' value='" . $_GET["query"] . "' />\n";
			$content .= "	<input type='hidden' name='action' value='search' />\n";
			$content .= "</form>";
			
			$content .= "<p>Found $resultCount " . ($resultCount === 1 ? "result" : "results") . " in " . $env->perfdata->search_time . "ms. ";
			
			$query = $_GET["query"];
			if(isset($pageindex->$query))
			{
				$content .= "There's a page on $settings->sitename called <a href='?page=" . rawurlencode($query) . "'>$query</a>.";
			}
			else
			{
				$content .= "There isn't a page called $query on $settings->sitename, but you ";
				if((!$settings->anonedits && !$env->is_logged_in) || !$settings->editing)
				{
					$content .= "do not have permission to create it.";
					if(!$env->is_logged_in)
					{
						$content .= " You could try <a href='?action=login&returnto=" . rawurlencode($_SERVER["REQUEST_URI"]) . "'>logging in</a>.";
					}
				}
				else
				{
					$content .= "can <a href='?action=edit&page=" . rawurlencode($query) . "'>create it</a>.";
				}
			}
			$content .= "</p>";
			
			$i = 0; // todo use $_GET["offset"] and $_GET["result-count"] or something
			foreach($results as $result)
			{
				$link = "?page=" . rawurlencode($result["pagename"]);
				$pagesource = file_get_contents($env->storage_prefix . $result["pagename"] . ".md");
				
				//echo("Extracting context for result " . $result["pagename"] . ".\n");
				$context = search::extract_context($_GET["query"], $pagesource);
				//echo("'Generated search context for " . $result["pagename"] . ": $context'\n");
				$context = search::highlight_context($_GET["query"], $context);
				/*if(strlen($context) == 0)
				{
					$context = search::strip_markup(file_get_contents("$env->page.md", null, null, null, $settings->search_characters_context * 2));
					if($pageindex->{$env->page}->size > $settings->search_characters_context * 2)
						$context .= "...";
				}*/
				
				
				// We add 1 to $i here to convert it from an index to a result
				// number as people expect it to start from 1
				$content .= "<div class='search-result' data-result-number='" . ($i + 1) . "' data-rank='" . $result["rank"] . "'>\n";
				$content .= "	<h2><a href='$link'>" . $result["pagename"] . "</a></h2>\n";
				$content .= "	<p class='search-context'>$context</p>\n";
				$content .= "</div>\n";
				
				$i++;
			}
			
			$content .= "</section>\n";
			
			header("content-type: text/html; charset=UTF-8");
			exit(page_renderer::render($title, $content));
			
			//header("content-type: text/plain");
			//var_dump($results);
		});
		
		/*
		 *  ██████  ██████  ███████ ███    ██ ███████ ███████  █████  ██████   ██████ ██   ██
		 * ██    ██ ██   ██ ██      ████   ██ ██      ██      ██   ██ ██   ██ ██      ██   ██
		 * ██    ██ ██████  █████   ██ ██  ██ ███████ █████   ███████ ██████  ██      ███████
		 * ██    ██ ██      ██      ██  ██ ██      ██ ██      ██   ██ ██   ██ ██      ██   ██
		 *  ██████  ██      ███████ ██   ████ ███████ ███████ ██   ██ ██   ██  ██████ ██   ██
		 */
		add_action("opensearch-description", function () {
			global $settings;
			$siteRoot = full_url() . "/index.php";
			if(!isset($_GET["debug"]))
				header("content-type: application/opensearchdescription+xml");
			else
				header("content-type: text/plain");
			
			exit(utf8_encode("<?xml version=\"1.0\" encoding=\"UTF-8\"
<OpenSearchDescription  xmlns=\"http://a9.com/-/spec/opensearch/1.1/\">
	<ShortName>Search $settings->sitename</ShortName>
	<Description>Search $settings->sitename, which is powered by Pepperminty Wiki.</Description>
	<Tags>$settings->sitename Wiki</Tags>
	<Image type=\"image/png\">$settings->favicon</Image>
	<Attribution>Search content available under the license linked to at the bottom of the search results page.</Attribution>
	<Developer>Starbeamrainbowlabs (https://github.com/sbrl/Pepperminty-Wiki/graphs/contributors)</Developer>
	<InputEncoding>UTF-8</InputEncoding>
	<OutputEncoding>UTF-8</OutputEncoding>
	
	<Url type=\"text/html\" method=\"get\" template=\"$siteRoot?action=search&amp;query={searchTerms}&amp;offset={startIndex?}&amp;count={count}\" />
</OpenSearchDescription>"));
		});
		
		add_action("suggest-pages", function() {
			global $settings, $pageindex;
			
			if($settings->dynamic_page_suggestion_count === 0)
			{
				header("content-type: application/json");
				header("content-length: 2");
				exit("[]");
			}
			
			if(empty($_GET["query"])) {
				http_response_code(400);
				header("content-type: text/plain");
				exit("Error: You didn't specify the 'query' GET parameter.");
			}
			
			// Rank each page name
			$results = [];
			foreach($pageindex as $pageName => $entry) {
				$results[] = [
					"pagename" => $pageName,
					// Costs: Insert: 1, Replace: 8, Delete: 6
					"distance" => levenshtein($_GET["query"], $pageName, 1, 8, 6)
				];
			}
			
			// Sort the page names by distance form the original query
			usort($results, function($a, $b) {
				if($a["distance"] == $b["distance"])
					return strcmp($a["pagename"], $b["pagename"]);
				return $a["distance"] < $b["distance"] ? -1 : 1;
			});
			
			// Send the results to the user
			header("content-type: application/json");
			exit(json_encode(array_slice($results, 0, $settings->dynamic_page_suggestion_count)));
		});
		
		if($settings->dynamic_page_suggestion_count > 0)
		{
			page_renderer::AddJSSnippet('/// Dynamic page suggestion system
// Micro snippet 8 - Promisified GET (fetched 20th Nov 2016)
function get(u){return new Promise(function(r,t,a){a=new XMLHttpRequest();a.onload=function(b,c){b=a.status;c=a.response;if(b>199&&b<300){r(c)}else{t(c)}};a.open("GET",u,true);a.send(null)})}

window.addEventListener("load", function(event) {
	var searchBox = document.querySelector("input[type=search]");
	searchBox.dataset.lastValue = "";
	searchBox.addEventListener("keyup", function(event) {
		// Make sure that we don\'t keep sending requests to the server if nothing has changed
		if(searchBox.dataset.lastValue == event.target.value)
			return;
		searchBox.dataset.lastValue = event.target.value;
		// Fetch the suggestions from the server
		get("?action=suggest-pages&query=" + encodeURIComponent(event.target.value)).then(function(response) {
			var suggestions = JSON.parse(response),
				dataList = document.getElementById("allpages");
			
			// If the server sent no suggestions, then we shouldn\'t replace the contents of the datalist
			if(suggestions.length == 0)
				return;
			
			console.info(`Fetched suggestions for ${event.target.value}:`, suggestions.map(s => s.pagename));
			
			// Remove all the existing suggestions
			while(dataList.firstChild) {
				dataList.removeChild(dataList.firstChild);
			}
			
			// Add the new suggestions to the datalist
			var optionsFrag = document.createDocumentFragment();
			suggestions.forEach(function(suggestion) {
				var suggestionElement = document.createElement("option");
				suggestionElement.value = suggestion.pagename;
				suggestionElement.dataset.distance = suggestion.distance;
				optionsFrag.appendChild(suggestionElement);
			});
			dataList.appendChild(optionsFrag);
		});
	});
});
');
		}
	}
]);

class search
{
	// Words that we should exclude from the inverted index
	public static $stop_words = [
		"a", "about", "above", "above", "across", "after", "afterwards", "again",
		"against", "all", "almost", "alone", "along", "already", "also",
		"although", "always", "am", "among", "amongst", "amoungst", "amount",
		"an", "and", "another", "any", "anyhow", "anyone", "anything", "anyway",
		"anywhere", "are", "around", "as", "at", "back", "be", "became",
		"because", "become", "becomes", "becoming", "been", "before",
		"beforehand", "behind", "being", "below", "beside", "besides",
		"between", "beyond", "bill", "both", "bottom", "but", "by", "call",
		"can", "cannot", "cant", "co", "con", "could", "couldnt", "cry", "de",
		"describe", "detail", "do", "done", "down", "due", "during", "each",
		"eg", "eight", "either", "eleven", "else", "elsewhere", "empty",
		"enough", "etc", "even", "ever", "every", "everyone", "everything",
		"everywhere", "except", "few", "fill", "find",
		"fire", "first", "five", "for", "former", "formerly", "found",
		"four", "from", "front", "full", "further", "get", "give", "go", "had",
		"has", "hasnt", "have", "he", "hence", "her", "here", "hereafter",
		"hereby", "herein", "hereupon", "hers", "herself", "him", "himself",
		"his", "how", "however", "ie", "if", "in", "inc", "indeed",
		"interest", "into", "is", "it", "its", "itself", "keep", "last",
		"latter", "latterly", "least", "less", "ltd", "made", "many", "may",
		"me", "meanwhile", "might", "mine", "more", "moreover", "most",
		"mostly", "move", "much", "must", "my", "myself", "name", "namely",
		"neither", "never", "nevertheless", "next", "nine", "no", "none",
		"nor", "not", "nothing", "now", "nowhere", "of", "off", "often", "on",
		"once", "one", "only", "onto", "or", "other", "others", "otherwise",
		"our", "ours", "ourselves", "out", "over", "own", "part", "per",
		"perhaps", "please", "put", "rather", "re", "same", "see", "seem",
		"seemed", "seeming", "seems", "serious", "several", "she", "should",
		"show", "side", "since", "sincere", "six", "sixty", "so", "some",
		"somehow", "someone", "something", "sometime", "sometimes",
		"somewhere", "still", "such", "system", "take", "ten", "than", "that",
		"the", "their", "them", "themselves", "then", "thence", "there",
		"thereafter", "thereby", "therefore", "therein", "thereupon", "these",
		"they", "thickv", "thin", "third", "this", "those", "though", "three",
		"through", "throughout", "thru", "thus", "to", "together", "too", "top",
		"toward", "towards", "twelve", "twenty", "two", "un", "under", "until",
		"up", "upon", "us", "very", "via", "was", "we", "well", "were", "what",
		"whatever", "when", "whence", "whenever", "where", "whereafter",
		"whereas", "whereby", "wherein", "whereupon", "wherever", "whether",
		"which", "while", "whither", "who", "whoever", "whole", "whom", "whose",
		"why", "will", "with", "within", "without", "would", "yet", "you",
		"your", "yours", "yourself", "yourselves"
	];
	
	public static function index($source)
	{
		$source = html_entity_decode($source, ENT_QUOTES);
		$source_length = strlen($source);
		
		$index = [];
		
		$terms = self::tokenize($source);
		$i = 0;
		foreach($terms as $term)
		{
			$nterm = $term;
			
			// Skip over stop words (see https://en.wikipedia.org/wiki/Stop_words)
			if(in_array($nterm, self::$stop_words)) continue;
			
			if(!isset($index[$nterm]))
			{
				$index[$nterm] = [ "freq" => 0, "offsets" => [] ];
			}
			
			$index[$nterm]["freq"]++;
			$index[$nterm]["offsets"][] = $i;
			
			$i++;
		}
		
		return $index;
	}
	
	public static function tokenize($source)
	{
		$source = strtolower($source);
		$source = str_replace([ '[', ']', '|', '{', '}' ], " ", $source);
		return preg_split("/((^\p{P}+)|(\p{P}*\s+\p{P}*)|(\p{P}+$))|\|/u", $source, -1, PREG_SPLIT_NO_EMPTY);
	}
	
	public static function strip_markup($source)
	{
		return str_replace([ "[", "]", "\"", "*", "_", " - ", "`" ], "", $source);
	}
	
	public static function rebuild_invindex()
	{
		global $pageindex, $env, $paths;
		
		header("content-type: text/event-stream");
		
		$invindex = [];
		foreach($pageindex as $pagename => $pagedetails)
		{
			echo("Adding $pagename to the new search index.\n\n");
			flush();
			$pagesource = utf8_encode(file_get_contents("$env->storage_prefix$pagename.md"));
			$index = self::index($pagesource);
			
			self::merge_into_invindex($invindex, ids::getid($pagename), $index);
		}
		
		echo("Search index rebuilding complete.\n\n");
		echo("Saving new search index to '$paths->searchindex'.\n\n");
		
		self::save_invindex($paths->searchindex, $invindex);
	}
	
	/*
	 * @summary Sorts an index alphabetically. Will also sort an inverted index.
	 * 			This allows us to do a binary search instead of a regular
	 * 			sequential search.
	 */
	public static function sort_index(&$index)
	{
		ksort($index, SORT_NATURAL);
	}
	
	/*
	 * @summary Compares two *regular* indexes to find the differences between them.
	 * 
	 * @param {array} $indexa - The old index.
	 * @param {array} $indexb - The new index.
	 * @param {array} $changed - An array to be filled with the nterms of all
	 * 							 the changed entries.
	 * @param {array} $removed - An array to be filled with the nterms of all
	 * 							 the removed entries.
	 */
	public static function compare_indexes($oldindex, $newindex, &$changed, &$removed)
	{
		foreach($oldindex as $nterm => $entry)
		{
			if(!isset($newindex[$nterm]))
				$removed[] = $nterm;
		}
		foreach($newindex as $nterm => $entry)
		{
			if(!isset($oldindex[$nterm]) or // If this world is new
			   $newindex[$nterm] !== $oldindex[$nterm]) // If this word has changed
				$changed[$nterm] = $newindex[$nterm];
		}
	}
	
	/*
	 * @summary Reads in and parses an inverted index.
	 */
	// Todo remove this function and make everything streamable
	public static function load_invindex($invindex_filename) {
		$invindex = json_decode(file_get_contents($invindex_filename), true);
		return $invindex;
	}
	
	public static function measure_invindex_load_time($invindex_filename) {
		global $env;
		
		$searchindex_decode_start = microtime(true);
		search::load_invindex($invindex_filename);
		$env->perfdata->searchindex_decode_time = round((microtime(true) - $searchindex_decode_start)*1000, 3);
	}
	
	/*
	 * @summary Merge an index into an inverted index.
	 */
	public static function merge_into_invindex(&$invindex, $pageid, &$index, &$removals = [])
	{
		// Remove all the subentries that were removed since last time
		foreach($removals as $nterm)
		{
			unset($invindex[$nterm][$pageid]);
		}
		
		// Merge all the new / changed index entries into the inverted index
		foreach($index as $nterm => $newentry)
		{
			// If the nterm isn't in the inverted index, then create a space for it
			if(!isset($invindex[$nterm])) $invindex[$nterm] = [];
			$invindex[$nterm][$pageid] = $newentry;
			
			// Sort the page entries for this word by frequency
			uasort($invindex[$nterm], function($a, $b) {
				if($a["freq"] == $b["freq"]) return 0;
				return ($a["freq"] < $b["freq"]) ? +1 : -1;
			});
		}
		
		// Sort the inverted index by rank
		uasort($invindex, function($a, $b) {
			$ac = count($a); $bc = count($b);
			if($ac == $bc) return 0;
			return ($ac < $bc) ? +1 : -1;
		});
	}
	
	/**
	 * Deletes the given pageid from the given pageindex.
	 * @param  inverted_index	&$invindex	The inverted index.
	 * @param  number			$pageid		The pageid to remove.
	 */
	public static function delete_entry(&$invindex, $pageid)
	{
		$str_pageid = (string)$pageid;
		foreach($invindex as $nterm => &$entry)
		{
			if(isset($entry[$pageid]))
				unset($entry[$pageid]);
			if(isset($entry[$str_pageid]))
				unset($entry[$str_pageid]);
			if(count($entry) === 0)
				unset($invindex[$nterm]);
		}
	}
	
	public static function save_invindex($filename, &$invindex)
	{
		file_put_contents($filename, json_encode($invindex));
	}
	
	public static function query_invindex($query, &$invindex)
	{
		global $settings, $pageindex;
		
		$query_terms = self::tokenize($query);
		$matching_pages = [];
		
		
		// Loop over each term in the query and find the matching page entries
		$count = count($query_terms);
		for($i = 0; $i < $count; $i++)
		{
			$qterm = $query_terms[$i];
			
			// Only search the inverted index if it actually exists there
			if(isset($invindex[$qterm]))
			{
				// Loop over each page in the inverted index entry
				foreach($invindex[$qterm] as $pageid => $page_entry)
				{
					// Create an entry in the matching pages array if it doesn't exist
					if(!isset($matching_pages[$pageid]))
						$matching_pages[$pageid] = [ "nterms" => [] ];
					$matching_pages[$pageid]["nterms"][$qterm] = $page_entry;
				}
			}
			
			
			// Loop over the pageindex and search the titles / tags
			foreach ($pageindex as $pagename => $pagedata)
			{
				// Get the current page's id
				$pageid = ids::getid($pagename);
				// Consider matches in the page title
				if(stripos($pagename, $qterm) !== false)
				{
					// We found the qterm in the title
					if(!isset($matching_pages[$pageid]))
						$matching_pages[$pageid] = [ "nterms" => [] ];
					
					// Set up a counter for page title matches if it doesn't exist already
					if(!isset($matching_pages[$pageid]["title-matches"]))
						$matching_pages[$pageid]["title-matches"] = 0;
					
					$matching_pages[$pageid]["title-matches"] += count(mb_stripos_all($pagename, $qterm));
				}
				
				// Consider matches in the page's tags
				if(isset($pagedata->tags) and // If this page has tags
				   stripos(implode(" ", $pagedata->tags), $qterm) !== false) // And we found the qterm in the tags
				{
					if(!isset($matching_pages[$pageid]))
						$matching_pages[$pageid] = [ "nterms" => [] ];
					
					// Set up a counter for tag match if there isn't one already
					if(!isset($matching_pages[$pageid]["tag-matches"]))
						$matching_pages[$pageid]["tag-matches"] = 0;
					$matching_pages[$pageid]["tag-matches"] += count(mb_stripos_all(implode(" ", $pagedata->tags), $qterm));
				}
			}
		}
		
		
		foreach($matching_pages as $pageid => &$pagedata)
		{
			$pagedata["pagename"] = ids::getpagename($pageid);
			$pagedata["rank"] = 0;
			
			foreach($pagedata["nterms"] as $pterm => $entry)
			{
				$pagedata["rank"] += $entry["freq"];
				
				// todo rank by context here
			}
			
			// Consider matches in the title / tags
			if(isset($pagedata["title-matches"]))
				$pagedata["rank"] += $pagedata["title-matches"] * $settings->search_title_matches_weighting;
			if(isset($pagedata["tag-matches"]))
				$pagedata["rank"] += $pagedata["tag-matches"] * $settings->search_tags_matches_weighting;
			
			// todo remove items if the rank is below a threshold
		}
		
		// todo sort by rank here
		uasort($matching_pages, function($a, $b) {
			if($a["rank"] == $b["rank"]) return 0;
			return ($a["rank"] < $b["rank"]) ? +1 : -1;
		});
		
		return $matching_pages;
	}
	
	public static function extract_context($query, $source)
	{
		global $settings;
		
		$nterms = self::tokenize($query);
		$matches = [];
		// Loop over each nterm and find it in the source
		foreach($nterms as $nterm)
		{
			$all_offsets = mb_stripos_all($source, $nterm);
			// Skip over adding matches if there aren't any
			if($all_offsets === false)
				continue;
			foreach($all_offsets as $offset)
			{
				$matches[] = [ $nterm, $offset ];
			}
		}
		
		// Sort the matches by offset
		usort($matches, function($a, $b) {
			if($a[1] == $b[1]) return 0;
			return ($a[1] > $b[1]) ? +1 : -1;
		});
		
		$sourceLength = strlen($source);
		
		$contexts = [];
		$basepos = 0;
		$matches_count = count($matches);
		while($basepos < $matches_count)
		{
			// Store the next match along - all others will be relative to that one
			$group = [$matches[$basepos]];
			
			// Start scanning at the next one along - we always store the first match
			$scanpos = $basepos + 1;
			$distance = 0;
			
			while(true)
			{
				// Break out if we reach the end
				if($scanpos >= $matches_count) break;
				
				// Find the distance between the current one and the last one
				$distance = $matches[$scanpos][1] - $matches[$scanpos - 1][1];
				
				// Store it if the distance is below the threshold
				if($distance < $settings->search_characters_context)
					$group[] = $matches[$scanpos];
				else
					break;
				
				$scanpos++;
			}
			
			$context_start = $group[0][1] - $settings->search_characters_context;
			$context_end = $group[count($group) - 1][1] + $settings->search_characters_context;
			
			if($context_start < 0) $context_start = 0;
			if($context_end > $sourceLength) $context_end = $sourceLength;
			
			//echo("Got context. Start: $context_start, End: $context_end\n");
			//echo("Group:"); var_dump($group);
			
			$context = substr($source, $context_start, $context_end - $context_start);
			
			// Strip the markdown from the context - it's most likely going to
			// be broken anyway.
			//$context = self::strip_markup($context);
			
			// Escape special characters to protect against attacks
			$context = htmlentities($context);
			
			$contexts[] = $context;
			
			$basepos = $scanpos + 1;
		}
		
		return implode(" ... ", $contexts);
	}
	
	public static function highlight_context($query, $context)
	{
		$qterms = self::tokenize($query);
		
		foreach($qterms as $qterm)
		{
			// From http://stackoverflow.com/a/2483859/1460422
			$context = preg_replace("/" . str_replace("/", "\/", preg_quote($qterm)) . "/i", "<strong class='search-term-highlight'>$0</strong>", $context);
		}
		
		return $context;
	}
}




register_module([
	"name" => "Uploader",
	"version" => "0.5.8",
	"author" => "Starbeamrainbowlabs",
	"description" => "Adds the ability to upload files to Pepperminty Wiki. Uploaded files act as pages and have the special 'File/' prefix.",
	"id" => "feature-upload",
	"code" => function() {
		global $settings;
		/**
		 * @api {get} ?action=upload Get a page to let you upload a file.
		 * @apiName UploadFilePage
		 * @apiGroup Upload
		 * @apiPermission User
		*/
		
		/**
		 * @api {post} ?action=upload Upload a file
		 * @apiName UploadFile
		 * @apiGroup Upload
		 * @apiPermission User
		 * 
		 * @apiParam {string}	name		The name of the file to upload.
		 * @apiParam {string}	description	A description of the file.
		 * @apiParam {file}		file		The file to upload.
		 *
		 * @apiUse	UserNotLoggedInError
		 * @apiError	UploadsDisabledError	Uploads are currently disabled in the wiki's settings.
		 * @apiError	UnknownFileTypeError	The type of the file you uploaded is not currently allowed in the wiki's settings.
		 * @apiError	ImageDimensionsFiledError	PeppermintyWiki couldn't obtain the dimensions of the image you uploaded.
		 * @apiError	DangerousFileError		The file uploaded appears to be dangerous.
		 * @apiError	DuplicateFileError		The filename specified is a duplicate of a file that already exists.
		 * @apiError	FileTamperedError		Pepperminty Wiki couldn't verify that the file wasn't tampered with during theupload process.
		 */
		
		/*
		 * ██    ██ ██████  ██       ██████   █████  ██████  
		 * ██    ██ ██   ██ ██      ██    ██ ██   ██ ██   ██ 
		 * ██    ██ ██████  ██      ██    ██ ███████ ██   ██ 
		 * ██    ██ ██      ██      ██    ██ ██   ██ ██   ██ 
		 *  ██████  ██      ███████  ██████  ██   ██ ██████  
		 */
		add_action("upload", function() {
			global $settings, $env, $pageindex, $paths;
			
			switch($_SERVER["REQUEST_METHOD"])
			{
				case "GET":
					// Send upload page
					
					if(!$settings->upload_enabled)
						exit(page_renderer::render("Upload Disabled - $setting->sitename", "<p>You can't upload anything at the moment because $settings->sitename has uploads disabled. Try contacting $settings->admindetails_name, your site Administrator. <a href='javascript:history.back();'>Go back</a>.</p>"));
					if(!$env->is_logged_in)
						exit(page_renderer::render("Upload Error - $settings->sitename", "<p>You are not currently logged in, so you can't upload anything.</p>
		<p>Try <a href='?action=login&returnto=" . rawurlencode("?action=upload") . "'>logging in</a> first.</p>"));
					
					exit(page_renderer::render("Upload - $settings->sitename", "<h1>Upload file</h1>
		<p>Select an image below, and then type a name for it in the box. This server currently supports uploads up to " . human_filesize(get_max_upload_size()) . " in size.</p>
		<p>$settings->sitename currently supports uploading of the following file types: " . implode(", ", $settings->upload_allowed_file_types) . ".</p>
		<form method='post' action='?action=upload' enctype='multipart/form-data'>
			<label for='file'>Select a file to upload.</label>
			<input type='file' name='file' id='file-upload-selector' tabindex='1' />
			<br />
			<label for='name'>Name:</label>
			<input type='text' name='name' id='file-upload-name' tabindex='5'  />
			<br />
			<label for='description'>Description:</label>
			<textarea name='description' tabindex='10'></textarea>
			<p class='editing_message'>$settings->editing_message</p>
			<input type='submit' value='Upload' tabindex='20' />
		</form>
		<script>
			document.getElementById('file-upload-selector').addEventListener('change', function() {
				var newName = event.target.value.substring(event.target.value.lastIndexOf(\"\\\\\") + 1, event.target.value.lastIndexOf(\".\"));
				console.log('Changing content of name box to:', newName);
				document.getElementById('file-upload-name').value = newName;
			});
		</script>"));
					
					break;
				
				case "POST":
					// Recieve file
					
					// Make sure uploads are enabled
					if(!$settings->upload_enabled)
					{
						unlink($_FILES["file"]["tmp_name"]);
						http_response_code(412);
						exit(page_renderer::render("Upload failed - $settings->sitename", "<p>Your upload couldn't be processed because uploads are currently disabled on $settings->sitename. <a href='index.php'>Go back to the main page</a>.</p>"));
					}
					
					// Make sure that the user is logged in
					if(!$env->is_logged_in)
					{
						unlink($_FILES["file"]["tmp_name"]);
						http_response_code(401);
						exit(page_renderer::render("Upload failed - $settings->sitename", "<p>Your upload couldn't be processed because you are not logged in.</p><p>Try <a href='?action=login&returnto=" . rawurlencode("?action=upload") . "'>logging in</a> first."));
					}
					
					// Calculate the target name, removing any characters we
					// are unsure about.
					$target_name = makepathsafe($_POST["name"]);
					$temp_filename = $_FILES["file"]["tmp_name"];
					
					$mimechecker = finfo_open(FILEINFO_MIME_TYPE);
					$mime_type = finfo_file($mimechecker, $temp_filename);
					finfo_close($mimechecker);
					
					if(!in_array($mime_type, $settings->upload_allowed_file_types))
					{
						http_response_code(415);
						exit(page_renderer::render("Unknown file type - Upload error - $settings->sitename", "<p>$settings->sitename recieved the file you tried to upload successfully, but detected that the type of file you uploaded is not in the allowed file types list. The file has been discarded.</p>
						<p>The file you tried to upload appeared to be of type <code>$mime_type</code>, but $settings->sitename currently only allows the uploading of the following file types: <code>" . implode("</code>, <code>", $settings->upload_allowed_file_types) . "</code>.</p>
						<p><a href='?action=$settings->defaultaction'>Go back</a> to the Main Page.</p>"));
					}
					
					// Perform appropriate checks based on the *real* filetype
					switch(substr($mime_type, 0, strpos($mime_type, "/")))
					{
						case "image":
							$extra_data = [];
							// Check SVG uploads with a special function
							$imagesize = $mime_type !== "image/svg+xml" ? getimagesize($temp_filename, $extra_data) : upload_check_svg($temp_filename);
							
							// Make sure that the image size is defined
							if(!is_int($imagesize[0]) or !is_int($imagesize[1]))
							{
								http_response_code(415);
								exit(page_renderer::render("Upload Error - $settings->sitename", "<p>Although the file that you uploaded appears to be an image, $settings->sitename has been unable to determine it's dimensions. The uploaded file has been discarded. <a href='?action=upload'>Go back to try again</a>.</p>
								<p>You may wish to consider <a href='https://github.com/sbrl/Pepperminty-Wiki'>opening an issue</a> against Pepperminty Wiki (the software that powers $settings->sitename) if this isn't the first time that you have seen this message.</p>"));
							}
							break;
					}
					
					$file_extension = system_mime_type_extension($mime_type);
					
					// Override the detected file extension if a file extension
					// is explicitly specified in the settings
					if(isset($settings->mime_mappings_overrides->$mime_type))
						$file_extension = $settings->mime_mappings_overrides->$mime_type;
					
					if(in_array($file_extension, [ "php", ".htaccess", "asp" ]))
					{
						http_response_code(415);
						exit(page_renderer::render("Upload Error - $settings->sitename", "<p>The file you uploaded appears to be dangerous and has been discarded. Please contact $settings->sitename's administrator for assistance.</p>
						<p>Additional information: The file uploaded appeared to be of type <code>$mime_type</code>, which mapped onto the extension <code>$file_extension</code>. This file extension has the potential to be executed accidentally by the web server.</p>"));
					}
					
					$new_filename = "$paths->upload_file_prefix$target_name.$file_extension";
					$new_description_filename = "$new_filename.md";
					
					if(isset($pageindex->$new_filename))
						exit(page_renderer::render("Upload Error - $settings->sitename", "<p>A page or file has already been uploaded with the name '$new_filename'. Try deleting it first. If you do not have permission to delete things, try contacting one of the moderators.</p>"));
					
					if(!file_exists($env->storage_prefix . "Files"))
						mkdir($env->storage_prefix . "Files", 0775);
					
					if(!move_uploaded_file($temp_filename, $env->storage_prefix . $new_filename))
					{
						http_response_code(409);
						exit(page_renderer::render("Upload Error - $settings->sitename", "<p>The file you uploaded was valid, but $settings->sitename couldn't verify that it was tampered with during the upload process. This probably means that either is a configuration error, or $settings->sitename has been attacked. Please contact " . $settings->admindetails_name . ", your $settings->sitename Administrator.</p>"));
					}
					
					$description = $_POST["description"];
					
					// Escape the raw html in the provided description if the setting is enabled
					if($settings->clean_raw_html)
						$description = htmlentities($description, ENT_QUOTES);
					
					file_put_contents($env->storage_prefix . $new_description_filename, $description);
					
					// Construct a new entry for the pageindex
					$entry = new stdClass();
					// Point to the description's filepath since this property
					// should point to a markdown file
					$entry->filename = $new_description_filename; 
					$entry->size = strlen($description);
					$entry->lastmodified = time();
					$entry->lasteditor = $env->user;
					$entry->uploadedfile = true;
					$entry->uploadedfilepath = $new_filename;
					$entry->uploadedfilemime = $mime_type;
					// Add the new entry to the pageindex
					// Assign the new entry to the image's filepath as that
					// should be the page name.
					$pageindex->$new_filename = $entry;
					
					// Generate a revision to keep the page history up to date
					if(module_exists("feature-history"))
					{
						$oldsource = ""; // Only variables can be passed by reference, not literals
						history_add_revision($entry, $description, $oldsource, false);
					}
					
					// Save the pageindex
					file_put_contents($paths->pageindex, json_encode($pageindex, JSON_PRETTY_PRINT));
					
					if(module_exists("feature-recent-changes"))
					{
						add_recent_change([
							"type" => "upload",
							"timestamp" => time(),
							"page" => $new_filename,
							"user" => $env->user,
							"filesize" => filesize($env->storage_prefix . $entry->uploadedfilepath)
						]);
					}
					
					header("location: ?action=view&page=$new_filename&upload=success");
					
					break;
			}
		});
		
		/**
		 * @api {get} ?action=preview&page={pageName}[&size={someSize}] Get a preview of a file
		 * @apiName PreviewFile
		 * @apiGroup Upload
		 * @apiPermission Anonymous
		 * 
		 * @apiParam {string}	page		The name of the file to preview.
		 * @apiParam {number}	size		Optional. The size fo the resulting preview. Will be clamped to fit within the bounds specified in the wiki's settings. May also be set to the keyword 'original', which will cause the original file to be returned with it's appropriate mime type instead.
		 *
		 * @apiError	PreviewNoFileError	No file was found associated with the specified page.
		 * @apiError	PreviewUnknownFileTypeError	Pepperminty Wiki was unable to generate a preview for the requested file's type.
		 */
		
		/*
		 * ██████  ██████  ███████ ██    ██ ██ ███████ ██     ██ 
		 * ██   ██ ██   ██ ██      ██    ██ ██ ██      ██     ██ 
		 * ██████  ██████  █████   ██    ██ ██ █████   ██  █  ██ 
		 * ██      ██   ██ ██       ██  ██  ██ ██      ██ ███ ██ 
		 * ██      ██   ██ ███████   ████   ██ ███████  ███ ███  
		 */
		add_action("preview", function() {
			global $settings, $env, $pageindex, $start_time;
			
			if(empty($pageindex->{$env->page}->uploadedfilepath))
			{
				$im = errorimage("The page '$env->page' doesn't have an associated file.");
				header("content-type: image/png");
				imagepng($im);
				exit();
			}
			
			$filepath = $env->storage_prefix . $pageindex->{$env->page}->uploadedfilepath;
			$mime_type = $pageindex->{$env->page}->uploadedfilemime;
			$shortFilename = substr($filepath, 1 + (strrpos($filepath, '/') !== false ? strrpos($filepath, '/') : -1));
			
			header("content-disposition: inline; filename=\"$shortFilename\"");
			
			// If the size is set or original, then send (or redirect to) the original image
			// Also do the same for SVGs if svg rendering is disabled.
			if(isset($_GET["size"]) and $_GET["size"] == "original" or
				(empty($settings->render_svg_previews) && $mime_type == "image/svg+xml"))
			{
				// Get the file size
				$filesize = filesize($filepath);
				
				// Send some headers
				header("content-length: $filesize");
				header("content-type: $mime_type");
				
				// Open the file and send it to the user
				$handle = fopen($filepath, "rb");
				fpassthru($handle);
				fclose($handle);
				exit();
			}
			
			// Determine the target size of the image
			$target_size = 512;
			if(isset($_GET["size"]))
				$target_size = intval($_GET["size"]);
			if($target_size < $settings->min_preview_size)
				$target_size = $settings->min_preview_size;
			if($target_size > $settings->max_preview_size)
				$target_size = $settings->max_preview_size;
			
			// Determine the output file type
			$output_mime = $settings->preview_file_type;
			if(isset($_GET["type"]) and in_array($_GET["type"], [ "image/png", "image/jpeg", "image/webp" ]))
				$output_mime = $_GET["type"];
			
			/// ETag handling ///
			// Generate the etag and send it to the client
			$preview_etag = sha1("$output_mime|$target_size|$filepath|$mime_type");
			$allheaders = getallheaders();
			$allheaders = array_change_key_case($allheaders, CASE_LOWER);
			if(!isset($allheaders["if-none-match"]))
			{
				header("etag: $preview_etag");
			}
			else
			{
				if($allheaders["if-none-match"] === $preview_etag)
				{
					http_response_code(304);
					header("x-generation-time: " . (microtime(true) - $start_time));
					exit();
				}
			}
			/// ETag handling end ///
			
			/* Disabled until we work out what to do about caching previews *
			$previewFilename = "$filepath.preview.$outputFormat";
			if($target_size === $settings->default_preview_size)
			{
				// The request is for the default preview size
				// Check to see if we have a preview pre-rendered
				
			}
			*/
			
			$preview = new Imagick();
			switch(substr($mime_type, 0, strpos($mime_type, "/")))
			{
				case "image":
					$preview->readImage($filepath);
					break;
				
				case "application":
					if($mime_type == "application/pdf")
					{
						$preview = new imagick();
						$preview->readImage("{$filepath}[0]");
						$preview->setResolution(300,300);
						$preview->setImageColorspace(255);
						break;
					}
				
				case "video":
				case "audio":
					if($settings->data_storage_dir == ".")
					{
						// The data storage directory is the current directory
						// Redirect to the file isntead
						http_response_code(307);
						header("location: " . $pageindex->{$env->page}->uploadedfilepath);
						exit();
					}
					// TODO: Add support for ranges here.
					// Get the file size
					$filesize = filesize($filepath);
					
					// Send some headers
					header("content-length: $filesize");
					header("content-type: $mime_type");
					
					// Open the file and send it to the user
					$handle = fopen($filepath, "rb");
					fpassthru($handle);
					fclose($handle);
					exit();
					break;
				
				default:
					http_response_code(501);
					$preview = errorimage("Unrecognised file type '$mime_type'.", $target_size);
					header("content-type: image/png");
					imagepng($preview);
					exit();
			}
			
			// Scale the image down to the target size
			$preview->resizeImage($target_size, $target_size, imagick::FILTER_LANCZOS, 1, true);
			
			// Send the completed preview image to the user
			header("content-type: $output_mime");
			header("x-generation-time: " . (microtime(true) - $start_time) . "s");
			$outputFormat = substr($output_mime, strpos($output_mime, "/") + 1);
			$preview->setImageFormat($outputFormat);
			echo($preview->getImageBlob());
			/* Disabled while we work out what to do about caching previews *
			// Save a preview file if there isn't one alreaddy
			if(!file_exists($previewFilename))
				file_put_contents($previewFilename, $preview->getImageBlob());
			*/
		});
		
		/*
		 * ██████  ██████  ███████ ██    ██ ██ ███████ ██     ██
		 * ██   ██ ██   ██ ██      ██    ██ ██ ██      ██     ██
		 * ██████  ██████  █████   ██    ██ ██ █████   ██  █  ██
		 * ██      ██   ██ ██       ██  ██  ██ ██      ██ ███ ██
		 * ██      ██   ██ ███████   ████   ██ ███████  ███ ███
		 * 
		 * ██████  ██ ███████ ██████  ██       █████  ██    ██ ███████ ██████
		 * ██   ██ ██ ██      ██   ██ ██      ██   ██  ██  ██  ██      ██   ██
		 * ██   ██ ██ ███████ ██████  ██      ███████   ████   █████   ██████
		 * ██   ██ ██      ██ ██      ██      ██   ██    ██    ██      ██   ██
		 * ██████  ██ ███████ ██      ███████ ██   ██    ██    ███████ ██   ██
		 */
		page_renderer::register_part_preprocessor(function(&$parts) {
			global $pageindex, $env, $settings;
			// Don't do anything if the action isn't view
			if($env->action !== "view")
				return;
			
			if(isset($pageindex->{$env->page}->uploadedfile) and $pageindex->{$env->page}->uploadedfile == true)
			{
				// We are looking at a page that is paired with an uploaded file
				$filepath = $pageindex->{$env->page}->uploadedfilepath;
				$mime_type = $pageindex->{$env->page}->uploadedfilemime;
				$dimensions = $mime_type !== "image/svg+xml" ? getimagesize($env->storage_prefix . $filepath) : getsvgsize($env->storage_prefix . $filepath);
				$fileTypeDisplay = substr($mime_type, 0, strpos($mime_type, "/"));
				$previewUrl = "?action=preview&size=$settings->default_preview_size&page=" . rawurlencode($env->page);
				
				$preview_html = "";
				switch($fileTypeDisplay)
				{
					case "application":
					case "image":
						if($mime_type == "application/pdf")
							$fileTypeDisplay = "file";
						
						$preview_sizes = [ 256, 512, 768, 1024, 1440 ];
						$preview_html .= "\t\t\t<figure class='preview'>
				<img src='$previewUrl' />
				<nav class='image-controls'>
					<ul><li><a href='" . ($env->storage_prefix == "./" ? $filepath : "?action=preview&size=original&page=" . rawurlencode($env->page)) . "'>&#x01f304; Original $fileTypeDisplay</a></li>";
						if($mime_type !== "image/svg+xml")
						{
							$preview_html .= "<li>Other Sizes: ";
							foreach($preview_sizes as $size)
								$preview_html .= "<a href='?action=preview&page=" . rawurlencode($env->page) . "&size=$size'>$size" . "px</a> ";
							$preview_html .= "</li>";
						}
						$preview_html .= "</ul></nav>\n\t\t\t</figure>";
						break;
					
					case "video":
						$preview_html .= "\t\t\t<figure class='preview'>
				<video src='$previewUrl' controls preload='metadata'>Your browser doesn't support HTML5 video, but you can still <a href='$previewUrl'>download it</a> if you'd like.</video>
			</figure>";
						break;
						
					case "audio":
						$preview_html .= "\t\t\t<figure class='preview'>
				<audio src='$previewUrl' controls preload='metadata'>Your browser doesn't support HTML5 audio, but you can still <a href='$previewUrl'>download it</a> if you'd like.</audio>
			</figure>";
				}
				
				$fileInfo = [];
				$fileInfo["Name"] = str_replace("File/", "", $filepath);
				$fileInfo["Type"] = $mime_type;
				$fileInfo["Size"] = human_filesize(filesize($env->storage_prefix . $filepath));
				switch($fileTypeDisplay)
				{
					case "image":
						$dimensionsKey = $mime_type !== "image/svg+xml" ? "Original dimensions" : "Native size";
						$fileInfo[$dimensionsKey] = "$dimensions[0] x $dimensions[1]";
						break;
				}
				$fileInfo["Uploaded by"] = $pageindex->{$env->page}->lasteditor;
				
				$preview_html .= "\t\t\t<h2>File Information</h2>
			<table>";
				foreach ($fileInfo as $displayName => $displayValue)
				{
					$preview_html .= "<tr><th>$displayName</th><td>$displayValue</td></tr>\n";
				}
				$preview_html .= "</table>";
				
				$parts["{content}"] = str_replace("</h1>", "</h1>\n$preview_html", $parts["{content}"]);
			}
		});
		
		// Register a section on the help page on uploading files
		add_help_section("28-uploading-files", "Uploading Files", "<p>$settings->sitename supports the uploading of files, though it is up to " . $settings->admindetails_name . ", $settings->sitename's administrator as to whether it is enabled or not (uploads are currently " . (($settings->upload_enabled) ? "enabled" : "disabled") . ").</p>
		<p>Currently Pepperminty Wiki (the software that $settings->sitename uses) only supports the uploading of images, although more file types should be supported in the future (<a href='//github.com/sbrl/Pepperminty-Wiki/issues'>open an issue on GitHub</a> if you are interested in support for more file types).</p>
		<p>Uploading a file is actually quite simple. Click the &quot;Upload&quot; option in the &quot;More...&quot; menu to go to the upload page. The upload page will tell you what types of file $settings->sitename allows, and the maximum supported filesize for files that you upload (this is usually set by the web server that the wiki is running on).</p>
		<p>Use the file chooser to select the file that you want to upload, and then decide on a name for it. Note that the name that you choose should not include the file extension, as this will be determined automatically. Enter a description that will appear on the file's page, and then click upload.</p>");
	}
]);

//// Pair of functions to calculate the actual maximum upload size supported by the server
//// Lifted from Drupal by @meustrus from  Stackoverflow. Link to answer:
//// http://stackoverflow.com/a/25370978/1460422
// Returns a file size limit in bytes based on the PHP upload_max_filesize
// and post_max_size
function get_max_upload_size()
{
	static $max_size = -1;
	if ($max_size < 0) {
		// Start with post_max_size.
		$max_size = parse_size(ini_get('post_max_size'));
		// If upload_max_size is less, then reduce. Except if upload_max_size is
		// zero, which indicates no limit.
		$upload_max = parse_size(ini_get('upload_max_filesize'));
		if ($upload_max > 0 && $upload_max < $max_size) {
			$max_size = $upload_max;
		}
	}
	return $max_size;
}

function parse_size($size) {
	$unit = preg_replace('/[^bkmgtpezy]/i', '', $size); // Remove the non-unit characters from the size.
	$size = preg_replace('/[^0-9\.]/', '', $size); // Remove the non-numeric characters from the size.
	if ($unit) {
		// Find the position of the unit in the ordered string which is the power of magnitude to multiply a kilobyte by.
		return round($size * pow(1024, stripos('bkmgtpezy', $unit[0])));
	} else {
		return round($size);
	}
}

function upload_check_svg($temp_filename)
{
	global $settings;
	// Check for script tags
	if(strpos(file_get_contents($temp_filename), "<script") !== false)
	{
		http_response_code(415);
		exit(page_renderer::render("Upload Error - $settings->sitename", "<p>$settings->sitename detected that you uploaded an SVG image and performed some extra security checks on your file. Whilst performing these checks it was discovered that the file you uploaded contains some Javascript, which could be dangerous. The uploaded file has been discarded. <a href='?action=upload'>Go back to try again</a>.</p>
		<p>You may wish to consider <a href='https://github.com/sbrl/Pepperminty-Wiki'>opening an issue</a> against Pepperminty Wiki (the software that powers $settings->sitename) if this isn't the first time that you have seen this message.</p>"));
	}
	
	// Find and return the size of the SVG image
	return getsvgsize($temp_filename);
}

function getsvgsize($svgFilename)
{
	$svg = simplexml_load_file($svgFilename); // Load it as XML
	if($svg === false)
	{
		http_response_code(415);
		exit(page_renderer::render("Upload Error - $settings->sitename", "<p>When $settings->sitename tried to open your SVG file for checking, it found some invalid syntax. The uploaded file has been discarded. <a href='?action=upload'>Go back to try again</a>.</p>"));
	}
	$rootAttrs = $svg->attributes();
	$imageSize = false;
	if(isset($rootAttrs->width) and isset($rootAttrs->height))
		$imageSize = [ intval($rootAttrs->width), intval($rootAttrs->height) ];
	else if(isset($rootAttrs->viewBox))
		$imageSize = array_map("intval", array_slice(explode(" ", $rootAttrs->viewBox), -2, 2));
	
	return $imageSize;
}

function errorimage($text, $target_size)
{
	$width = 640;
	$height = 480;
	
	if(!empty($target_size))
	{
		$width = $target_size;
		$height = $target_size * (2 / 3);
	}
	
	$image = imagecreatetruecolor($width, $height);
	imagefill($image, 0, 0, imagecolorallocate($image, 238, 232, 242)); // Set the background to #eee8f2
	$fontwidth = imagefontwidth(3);
	imagestring($image, 3,
		($width / 2) - (($fontwidth * strlen($text)) / 2),
		($height / 2) - (imagefontheight(3) / 2),
		$text,
		imagecolorallocate($image, 17, 17, 17) // #111111
	);
	
	return $image;
}




register_module([
	"name" => "Credits",
	"version" => "0.7.5",
	"author" => "Starbeamrainbowlabs",
	"description" => "Adds the credits page. You *must* have this module :D",
	"id" => "page-credits",
	"code" => function() {
		/**
		 * @api {get} ?action=credits Get the credits page
		 * @apiName Credits
		 * @apiGroup Utility
		 * @apiPermission Anonymous
		 */
		
		/*
		 *  ██████ ██████  ███████ ██████  ██ ████████ ███████ 
		 * ██      ██   ██ ██      ██   ██ ██    ██    ██      
		 * ██      ██████  █████   ██   ██ ██    ██    ███████ 
		 * ██      ██   ██ ██      ██   ██ ██    ██         ██ 
		 *  ██████ ██   ██ ███████ ██████  ██    ██    ███████ 
		 */
		add_action("credits", function() {
			global $settings, $version, $pageindex, $modules;
			
			$credits = [
				"Code" => [
					"author" => "Starbeamrainbowlabs",
					"author_url" => "https://starbeamrmainbowlabs.com/",
					"thing_url" => "https://github.com/sbrl/Pepprminty-Wiki",
					"icon" => "https://avatars0.githubusercontent.com/u/9929737?v=3&s=24"
				],
				"Mime type to file extension mapper" => [
					"author" => "Chaos",
					"author_url" => "https://stackoverflow.com/users/47529/chaos",
					"thing_url" => "https://stackoverflow.com/a/1147952/1460422",
					"icon" => "https://www.gravatar.com/avatar/aaee40db39ad6b164cfb89cb6ad4d176?s=328&d=identicon&s=24"
				],
				"Parsedown" => [
					"author" => "Emanuil Rusev and others",
					"author_url" => "https://github.com/erusev/",
					"thing_url" => "https://github.com/erusev/parsedown/",
					"icon" => "https://avatars1.githubusercontent.com/u/184170?v=3&s=24"
				],
				"CSS Minification Code" => [
					"author" => "Jean",
					"author_url" => "http://www.catswhocode.com/",
					"thing_url" => "http://www.catswhocode.com/blog/3-ways-to-compress-css-files-using-php"
				],
				"Slightly modified version of Slimdown" => [
					"author" => "Johnny Broadway",
					"author_url" => "https://github.com/jbroadway",
					"thing_url" => "https://gist.github.com/jbroadway/2836900",
					"icon" => "https://avatars2.githubusercontent.com/u/87886?v=3&s=24"
				],
				"Insert tab characters into textareas" => [
					"author" => "Unknown",
					"author_url" => "http://stackoverflow.com/q/6140632/1460422",
					"thing_url" => "https://jsfiddle.net/2wAzx/13/",
				],
				"Default Favicon" => [
					"author" => "bluefrog23",
					"author_url" => "https://openclipart.org/user-detail/bluefrog23/",
					"thing_url" => "https://openclipart.org/detail/19571/peppermint-candy-by-bluefrog23"
				],
				"Bug Reports" => [
					"author" => "nibreh",
					"author_url" => "https://github.com/nibreh/",
					"thing_url" => "",
					"icon" => "https://avatars2.githubusercontent.com/u/7314006?v=3&s=24"
				]
			];
			
			//// Credits html renderer ////
			$credits_html = "<ul>\n";
			foreach($credits as $thing => $author_details)
			{
				$credits_html .= "	<li>";
				$credits_html .= "<a href='" . $author_details["thing_url"] . "'>$thing</a> by ";
				if(isset($author_details["icon"]))
				$credits_html .= "<img style='vertical-align: middle;' src='" . $author_details["icon"] . "' /> ";
				$credits_html .= "<a href='" . $author_details["author_url"] . "'>" . $author_details["author"] . "</a>";
				$credits_html .= "</li>\n";
			}
			$credits_html .= "</ul>";
			///////////////////////////////
			
			//// Module html renderer ////
			$modules_html = "<table>
	<tr>
		<th>Name</th>
		<th>Version</th>
		<th>Author</th>
		<th>Description</th>
	</tr>";
			foreach($modules as $module)
			{
				$modules_html .= "	<tr>
		<td title='" . $module["id"] . "'>" . $module["name"] . "</td>
		<td>" . $module["version"] . "</td>
		<td>" . $module["author"] . "</td>
		<td>" . $module["description"] . "</td>
	</tr>\n";
			}
			$modules_html .= "</table>";
			//////////////////////////////
			
			$title = "Credits - $settings->sitename";
			$content = "<h1>$settings->sitename credits</h1>
	<p>$settings->sitename is powered by Pepperminty Wiki - an entire wiki packed inside a single file, which was built by <a href='//starbeamrainbowlabs.com'>Starbeamrainbowlabs</a>, and can be found <a href='//github.com/sbrl/Pepperminty-Wiki/'>on GitHub</a> (contributors will also be listed here in the future). Pepperminty Wiki is licensed under the <a target='_blank' href='https://www.mozilla.org/en-US/MPL/2.0/'>Mozilla Public License 2.0</a> (<a target='_blank' href='https://tldrlegal.com/license/mozilla-public-license-2.0-(mpl-2)'>simple version</a>).</p>
	<h2>Main Credits</h2>
	$credits_html
	<h2>Site status</h2>
	<table>
		<tr><th>Site name:</th><td>$settings->sitename (<a href='?action=update'>$settings->admindisplaychar Update</a>, <a href='?action=export'>Export as zip - Check for permission first</a>)</td></tr>
		<tr><th>Pepperminty Wiki version:</th><td>$version</td></tr>
		<tr><th>Number of pages:</th><td>" . count(get_object_vars($pageindex)) . "</td></tr>
		<tr><th>Number of modules:</th><td>" . count($modules) . "</td></tr>
	</table>
	<h2>Installed Modules</h2>
	$modules_html";
			exit(page_renderer::render_main($title, $content));
		});
	}
]);




register_module([
	"name" => "Debug Information",
	"version" => "0.1",
	"author" => "Starbeamrainbowlabs",
	"description" => "Adds a debug action for administrator use only that collects a load of useful information to make reporting bugs easier.",
	"id" => "page-debug-info",
	"code" => function() {
		global $settings, $env;
		/**
		 * @api {get} ?action=debug	Get a debug dump
		 * @apiName Debug
		 * @apiGroup Utility
		 * @apiPermission Moderator
		 *
		 * @apiUse UserNotModeratorError
		 */
		
		/*
		 * ██████  ███████ ██████  ██    ██  ██████  
		 * ██   ██ ██      ██   ██ ██    ██ ██       
		 * ██   ██ █████   ██████  ██    ██ ██   ███ 
		 * ██   ██ ██      ██   ██ ██    ██ ██    ██ 
		 * ██████  ███████ ██████   ██████   ██████
		*/
		add_action("debug", function() {
			global $settings, $env, $paths, $version;
			header("content-type: text/plain");
			
			if(!$env->is_admin)
			{
				exit("You must be logged in as an moderator in order to generate debugging information.");
			}
			
			$title = "$settings->sitename debug report";
			echo("$title\n");
			echo(str_repeat("=", strlen($title)) . "\n");
			echo("Powered by Pepperminty Wiki version $version.\n");
			echo("This report may contain personal information.\n\n");
			echo("Environment: ");
			echo(var_export($env, true));
			echo("\nPaths: ");
			var_dump(var_export($paths, true));
			echo("\nServer information:\n");
			echo("uname -a: " . php_uname() . "\n");
			echo("Path: " . getenv("PATH") . "\n");
			echo("Temporary directory: " . sys_get_temp_dir() . "\n");
			echo("Server: " . $_SERVER["SERVER_SOFTWARE"] . "\n");
			echo("Web root: " . $_SERVER["DOCUMENT_ROOT"] . "\n");
			echo("Web server user: " . exec("whoami") . "\n");
			echo("PHP version: " . phpversion() . "\n");
			echo("index.php location: " . __FILE__ . "\n");
			echo("index.php file permissions: " . substr(sprintf('%o', fileperms("./index.php")), -4) . "\n");
			echo("Current folder permissions: " . substr(sprintf('%o', fileperms(".")), -4) . "\n");
			echo("Storage directory permissions: " . substr(sprintf('%o', fileperms($env->storage_prefix)), -4) . "\n");
			echo("Loaded extensions: " . implode(", ", get_loaded_extensions()) . "\n");
			echo("Settings:\n-----\n");
			$settings_export = explode("\n", var_export($settings, true));
			foreach ($settings_export as &$row)
			{
				if(preg_match("/(sitesecret|email)/i", $row)) $row = "********* secret *********"; 
			}
			echo(implode("\n", $settings_export));
			echo("\n-----\n");
			exit();
		});
		
		if($env->is_admin)
		{
			add_help_section("810-debug-information", "Gathering debug information", "<p>As a moderator, $settings->sitename gives you the ability to generate a report on $settings->sitename's installation of Pepperminty Wiki for debugging purposes.</p>
			<p>To generate such a report, visit the <code>debug</code> action or <a href='?action=debug'>click here</a>.</p>");
		}
	}
]);




register_module([
	"name" => "Page deleter",
	"version" => "0.10",
	"author" => "Starbeamrainbowlabs",
	"description" => "Adds an action to allow administrators to delete pages.",
	"id" => "page-delete",
	"code" => function() {
		global $settings;
		/**
		 * @api {post} ?action=delete Delete a page
		 * @apiDescription	Delete a page and all its associated data.
		 * @apiName DeletePage
		 * @apiGroup Page
		 * @apiPermission Moderator
		 * 
		 * @apiParam {string}	page		The name of the page to delete.
		 * @apiParam {string}	delete		Set to 'yes' to actually delete the page.
		 *
		 * @apiUse	UserNotModeratorError
		 * @apiError	PageNonExistentError	The specified page doesn't exist
		 */
		
		/*
		 * ██████  ███████ ██      ███████ ████████ ███████ 
		 * ██   ██ ██      ██      ██         ██    ██      
		 * ██   ██ █████   ██      █████      ██    █████   
		 * ██   ██ ██      ██      ██         ██    ██      
		 * ██████  ███████ ███████ ███████    ██    ███████ 
		 */
		add_action("delete", function() {
			global $pageindex, $settings, $env, $paths, $modules;
			if(!$settings->editing)
			{
				exit(page_renderer::render_main("Error: Editing disabled - Deleting $env->page", "<p>You tried to delete $env->page, but editing is disabled on this wiki.</p>
				<p>If you wish to delete this page, please re-enable editing on this wiki first.</p>
				<p><a href='index.php?page=$env->page'>Go back to $env->page</a>.</p>
				<p>Nothing has been changed.</p>"));
			}
			if(!$env->is_admin)
			{
				exit(page_renderer::render_main("Error: Insufficient permissions - Deleting $env->page", "<p>You tried to delete $env->page, but you are not an admin so you don't have permission to do that.</p>
				<p>You should try <a href='index.php?action=login'>logging in</a> as an admin.</p>"));
			}
			if(!isset($pageindex->{$env->page}))
			{
				exit(page_renderer::render_main("Error: Non-existent page - Deleting $env->page", "<p>You tried to delete $env->page, but that page doesn't appear to exist in the first page. <a href='?'>Go back</a> to the $settings->defaultpage.</p>"));
			}
			
			if(!isset($_GET["delete"]) or $_GET["delete"] !== "yes")
			{
				exit(page_renderer::render_main("Deleting $env->page", "<p>You are about to <strong>delete</strong> $env->page" . (module_exists("feature-history")?" and all its revisions":"") . ". You can't undo this!</p>
				<p><a href='index.php?action=delete&page=$env->page&delete=yes'>Click here to delete $env->page.</a></p>
				<p><a href='index.php?action=view&page=$env->page'>Click here to go back.</a>"));
			}
			$page = $env->page;
			// Delete the associated file if it exists
			if(!empty($pageindex->$page->uploadedfile))
			{
				unlink($env->storage_prefix . $pageindex->$page->uploadedfilepath);
			}
			
			// While we're at it, we should delete all the revisions too
			foreach($pageindex->{$env->page}->history as $revisionData)
			{
				unlink($env->storage_prefix . $revisionData->filename);
			}
			
			// Delete the page from the page index
			unset($pageindex->$page);
			
			// Save the new page index
			file_put_contents($paths->pageindex, json_encode($pageindex, JSON_PRETTY_PRINT)); 
			
			// Remove the page's name from the id index
			ids::deletepagename($env->page);
			
			// Delete the page from the search index, if that module is installed
			if(module_exists("feature-search"))
			{
				$pageid = ids::getid($env->page);
				$invindex = search::load_invindex($paths->searchindex);
				search::delete_entry($invindex, $pageid);
				search::save_invindex($paths->searchindex, $invindex);
			}
			
			// Delete the page from the disk
			unlink("$env->storage_prefix$env->page.md");
			
			// Add a recent change announcing the deletion if the recent changes
			// module is installed
			if(module_exists("feature-recent-changes"))
			{
				add_recent_change([
					"type" => "deletion",
					"timestamp" => time(),
					"page" => $env->page,
					"user" => $env->user,
				]);
			}
			
			exit(page_renderer::render_main("Deleting $env->page - $settings->sitename", "<p>$env->page has been deleted. <a href='index.php'>Go back to the main page</a>.</p>"));
		});
		
		// Register a help section
		add_help_section("60-delete", "Deleting Pages", "<p>If you are logged in as an adminitrator, then you have the power to delete pages. To do this, click &quot;Delete&quot; in the &quot;More...&quot; menu when browsing the pge you wish to delete. When you are sure that you want to delete the page, click the given link.</p>
		<p><strong>Warning: Once a page has been deleted, you can't bring it back! You will need to recover it from your backup, if you have one (which you really should).</strong></p>");
	}
]);




register_module([
	"name" => "Page editor",
	"version" => "0.15.1",
	"author" => "Starbeamrainbowlabs",
	"description" => "Allows you to edit pages by adding the edit and save actions. You should probably include this one.",
	"id" => "page-edit",
	
	"code" => function() {
		global $settings;
		
		/**
		 * @api {get} ?action=edit&page={pageName}[&newpage=yes]	Get an editing page
		 * @apiDescription	Gets an editing page for a given page. If you don't have permission to edit the page in question, a view source pagee is returned instead.
		 * @apiName			EditPage
		 * @apiGroup		Page
		 * @apiPermission	Anonymous
		 * 
		 * @apiUse PageParameter
		 * @apiParam	{string}	newpage		Set to 'yes' if a new page is being created. Only affects a few bits of text here and there, and the HTTP response code recieved on success from the `save` action.
		 */
		
		/*
		 *           _ _ _
		 *   ___  __| (_) |_
		 *  / _ \/ _` | | __|
		 * |  __/ (_| | | |_
		 *  \___|\__,_|_|\__|
		 *             %edit%
		 */
		add_action("edit", function() {
			global $pageindex, $settings, $env;
			
			$filename = "$env->storage_prefix$env->page.md";
			$page = $env->page;
			$creatingpage = !isset($pageindex->$page);
			if((isset($_GET["newpage"]) and $_GET["newpage"] == "true") or $creatingpage)
			{
				$title = "Creating $env->page";
			}
			else
			{
				$title = "Editing $env->page";
			}
			
			$pagetext = "";
			if(isset($pageindex->$page))
			{
				$pagetext = file_get_contents($filename);
			}
			
			if((!$env->is_logged_in and !$settings->anonedits) or // if we aren't logged in and anonymous edits are disabled
			   !$settings->editing or // or editing is disabled
			   (
				   isset($pageindex->$page) and // or if the page exists
				   isset($pageindex->$page->protect) and // the protect property exists
				   $pageindex->$page->protect and // the protect property is true
				   !$env->is_admin // the user isn't an admin
			   )
			)
			{
				if(!$creatingpage)
				{
					// The page already exists - let the user view the page source
					if($env->is_logged_in)
						exit(page_renderer::render_main("Viewing source for $env->page", "<p>$env->page is protected, and you aren't an administrator or moderator. You can view the source of $env->page below, but you can't edit it.</p><textarea name='content' readonly>$pagetext</textarea>"));
					else
						exit(page_renderer::render_main("Viewing source for $env->page", "<p>$settings->sitename does not allow anonymous users to make edits. You can view the source of $env->page below, but you can't edit it. You could, however, try <a href='index.php?action=login&returnto=" . rawurlencode($_SERVER["REQUEST_URI"]) . "'>logging in</a>.</p><textarea name='content' readonly>$pagetext</textarea>"));
						
				}
				else
				{
					http_response_code(404);
					exit(page_renderer::render_main("404 - $env->page", "<p>The page <code>$env->page</code> does not exist, but you do not have permission to create it.</p><p>If you haven't already, perhaps you should try <a href='index.php?action=login&returnto=" . rawurlencode($_SERVER["REQUEST_URI"]) . "'>logging in</a>.</p>"));
				}
			}
			
			$content = "<h1>$title</h1>";
			$page_tags = implode(", ", (!empty($pageindex->{$env->page}->tags)) ? $pageindex->{$env->page}->tags : []);
			if(!$env->is_logged_in and $settings->anonedits)
			{
				$content .= "<p><strong>Warning: You are not logged in! Your IP address <em>may</em> be recorded.</strong></p>";
			}
			$content .= "<form method='post' action='index.php?action=save&page=" . rawurlencode($page) . "&action=save' class='editform'>
			<input type='hidden' name='prev-content-hash' value='" . sha1($pagetext) . "' />
			<textarea name='content' autofocus tabindex='1'>$pagetext</textarea>
			<input type='text' name='tags' value='$page_tags' placeholder='Enter some tags for the page here. Separate them with commas.' title='Enter some tags for the page here. Separate them with commas.' tabindex='2' />
			<p class='editing-message'>$settings->editing_message</p>
			<input name='submit-edit' type='submit' value='Save Page' tabindex='3' />
		</form>";
			// Allow tab characters in the page editor
			page_renderer::AddJSSnippet("window.addEventListener('load', function(event) {
	// Adapted from https://jsfiddle.net/2wAzx/13/
	document.querySelector(\"[name=content]\").addEventListener(\"keydown\", (event) => {
		if(event.keyCode !== 9) return true;
		var currentValue = event.target.value, startPos = event.target.selectionStart, endPos = event.target.selectionEnd;
		event.target.value = currentValue.substring(0, startPos) + \"\\t\" + currentValue.substring(endPos);
		event.target.selectionStart = event.target.selectionEnd = startPos + 1;
		event.stopPropagation(); event.preventDefault();
		return false;
	});
});");
			
			// ~
			
			/// ~~~ Smart saving ~~~ ///
			// TODO: Add a button to press that restores the content that you were working on before.
			page_renderer::AddJSSnippet('document.addEventListener("load", function(event) {
	// Smart saving
	function getSmartSaveKey() { return document.querySelector("main h1").innerHTML.replace("Creating ", "").replace("Editing ", "").trim(); }
	// Saving
	document.querySelector("textarea[name=content]").addEventListener("keyup", function(event) { window.localStorage.setItem(getSmartSaveKey(), event.target.value) });
	// Loading
	window.addEventListener("load", function(event) {
		var editor = document.querySelector("textarea[name=content]");
		if(editor.value.length > 0) return; // Don\'t restore if there\'s data in the editor already
		editor.value = localStorage.getItem(getSmartSaveKey());
	});
});');
			
			exit(page_renderer::render_main("$title - $settings->sitename", $content));
		});
		
		/**
		 * @api {post} ?action=save&page={pageName}	Save an edit to a page.
		 * @apiDescription	Saves an edit to a page. If an edit conflict is encountered, then a conflict resolution page is returned instead.
		 * @apiName			EditPage
		 * @apiGroup		Page
		 * @apiPermission	Anonymous
		 * 
		 * @apiUse	PageParameter
		 * @apiParam	{string}	newpage		GET only. Set to 'yes' to indicate that this is a new page that is being saved. Only affects the HTTP response code you recieve upon success.
		 * @apiParam	{string}	content		POST only. The new content to save to the given filename.
		 * @apiParam	{string}	tags		POST only. A comma-separated list of tags to assign to the current page. Will replace the existing list of tags, if any are present.
		 * @apiParam	{string}	prev-content-hash	POST only. The hash of the original content before editing. If this hash is found to be different to a hash computed of the currentl saved content, a conflict resolution page will be returned instead of saving the provided content.
		 * 
		 * @apiError	UnsufficientPermissionError	You don't currently have sufficient permissions to save an edit.
		 */
		
		/*
		 *
		 *  ___  __ ___   _____
		 * / __|/ _` \ \ / / _ \
		 * \__ \ (_| |\ V /  __/
		 * |___/\__,_| \_/ \___|
		 *                %save%
		 */
		add_action("save", function() {
			global $pageindex, $settings, $env, $save_preprocessors, $paths; 
			
			if(!$settings->editing)
			{
				header("location: index.php?page=$env->page");
				exit(page_renderer::render_main("Error saving edit", "<p>Editing is currently disabled on this wiki.</p>"));
			}
			if(!$env->is_logged_in and !$settings->anonedits)
			{
				http_response_code(403);
				header("refresh: 5; url=index.php?page=$env->page");
				exit("You are not logged in, so you are not allowed to save pages on $settings->sitename. Redirecting in 5 seconds....");
			}
			$page = $env->page;
			if((
				isset($pageindex->$page) and
				isset($pageindex->page->protect) and
				$pageindex->$page->protect
			) and !$env->is_admin)
			{
				http_response_code(403);
				header("refresh: 5; url=index.php?page=$env->page");
				exit("$env->page is protected, and you aren't logged in as an administrator or moderator. Your edit was not saved. Redirecting in 5 seconds...");
			}
			if(!isset($_POST["content"]))
			{
				http_response_code(400);
				header("refresh: 5; url=index.php?page=$env->page");
				exit("Bad request: No content specified.");
			}
			
			// Make sure that the directory in which the page needs to be saved exists
			if(!is_dir(dirname("$env->storage_prefix$env->page.md")))
			{
				// Recursively create the directory if needed
				mkdir(dirname("$env->storage_prefix$env->page.md"), 0775, true);
			}
			
			// Read in the new page content
			$pagedata = $_POST["content"];
			// We don't need to santise the input here as Parsedown has an
			// option that does this for us, and is _way_ more intelligent about
			// it.
			
			// Read in the new page tags, so long as there are actually some
			// tags to read in
			$page_tags = [];
			if(strlen(trim($_POST["tags"])) > 0)
			{
				$page_tags = explode(",", $_POST["tags"]);
				// Trim off all the whitespace
				foreach($page_tags as &$tag)
					$tag = trim($tag);
			}
			
			// Check for edit conflicts
			if(!empty($pageindex->{$env->page}) && file_exists($env->storage_prefix . $pageindex->{$env->page}->filename))
			{
				$existing_content_hash = sha1_file($env->storage_prefix . $pageindex->{$env->page}->filename);
				if(isset($_POST["prev-content-hash"]) and
				$existing_content_hash != $_POST["prev-content-hash"])
				{
					$existingPageData = htmlentities(file_get_contents($env->storage_prefix . $env->storage_prefix . $pageindex->{$env->page}->filename));
					// An edit conflict has occurred! We should get the user to fix it.
					$content = "<h1>Resolving edit conflict - $env->page</h1>";
					if(!$env->is_logged_in and $settings->anonedits)
					{
						$content .= "<p><strong>Warning: You are not logged in! Your IP address <em>may</em> be recorded.</strong></p>";
					}
					$content .= "<p>An edit conflict has arisen because someone else has saved an edit to $env->page since you started editing it. Both texts are shown below, along the differences between the 2 conflicting revisions. To continue, please merge your changes with the existing content. Note that only the text in the existing content box will be kept when you press the \"Resolve Conflict\" button at the bottom of the page.</p>
					
					<form method='post' action='index.php?action=save&page=" . rawurlencode($page) . "&action=save' class='editform'>
					<h2>Existing content</h2>
					<textarea id='original-content' name='content' autofocus tabindex='1'>$existingPageData</textarea>
					
					<h2>Differences</h2>
					<div id='highlighted-diff' class='highlighted-diff'></div>
					<!--<pre class='highlighted-diff-wrapper'><code id='highlighted-diff'></code></pre>-->
					
					<h2>Your content</h2>
					<textarea id='new-content'>$pagedata</textarea>
					<input type='text' name='tags' value='" . $_POST["tags"] . "' placeholder='Enter some tags for the page here. Separate them with commas.' title='Enter some tags for the page here. Separate them with commas.' tabindex='2' />
					<p class='editing_message'>$settings->editing_message</p>
					<input name='submit-edit' type='submit' value='Resolve Conflict' tabindex='3' />
					</form>";
					
					// Insert a reference to jsdiff to generate the diffs
					$diffScript = <<<'DIFFSCRIPT'
window.addEventListener("load", function(event) {
	var destination = document.getElementById("highlighted-diff"),
	diff = JsDiff.diffWords(document.getElementById("original-content").value, document.getElementById("new-content").value),
	output = "";
	diff.forEach(function(change) {
		var classes = "token";
		if(change.added) classes += " diff-added";
		if(change.removed) classes += " diff-removed";
		output += `<span class='${classes}'>${change.value}</span>`;
	});
	destination.innerHTML = output;
});
DIFFSCRIPT;

					$content .= "\n<script src='https://cdnjs.cloudflare.com/ajax/libs/jsdiff/2.2.2/diff.min.js'></script>
					<script>$diffScript</script>\n";
					
					exit(page_renderer::render_main("Edit Conflict - $env->page - $settings->sitename", $content));
				}
			}
			
			// -----~~~==~~~-----
			
			// Update the inverted search index
			
			// Construct an index for the old and new page content
			$oldindex = [];
			$oldpagedata = ""; // We need the old page data in order to pass it to the preprocessor
			if(file_exists("$env->storage_prefix$env->page.md"))
			{
				$oldpagedata = file_get_contents("$env->storage_prefix$env->page.md");
				$oldindex = search::index($oldpagedata);
			}
			$newindex = search::index($pagedata);
			
			// Compare the indexes of the old and new content
			$additions = [];
			$removals = [];
			search::compare_indexes($oldindex, $newindex, $additions, $removals);
			// Load in the inverted index
			$invindex = search::load_invindex($env->storage_prefix . "invindex.json");
			// Merge the changes into the inverted index
			search::merge_into_invindex($invindex, ids::getid($env->page), $additions, $removals);
			// Save the inverted index back to disk
			search::save_invindex($env->storage_prefix . "invindex.json", $invindex);
			
			// -----~~~==~~~-----
			
			if(file_put_contents("$env->storage_prefix$env->page.md", $pagedata) !== false)
			{
				$page = $env->page;
				// Make sure that this page's parents exist
				check_subpage_parents($page);
				
				// Update the page index
				if(!isset($pageindex->$page))
				{
					$pageindex->$page = new stdClass();
					$pageindex->$page->filename = "$env->page.md";
				}
				$pageindex->$page->size = strlen($_POST["content"]);
				$pageindex->$page->lastmodified = time();
				if($env->is_logged_in)
					$pageindex->$page->lasteditor = utf8_encode($env->user);
				else // TODO: Add an option to record the user's IP here instead
					$pageindex->$page->lasteditor = utf8_encode("anonymous");
				$pageindex->$page->tags = $page_tags;
				
				// A hack to resave the pagedata if the preprocessors have
				// changed it. We need this because the preprocessors *must*
				// run _after_ the pageindex has been updated.
				$pagedata_orig = $pagedata;
				
				// Execute all the preprocessors
				foreach($save_preprocessors as $func)
				{
					$func($pageindex->$page, $pagedata, $oldpagedata);
				}
				
				if($pagedata !== $pagedata_orig)
					file_put_contents("$env->storage_prefix$env->page.md", $pagedata);
				
				
				file_put_contents($paths->pageindex, json_encode($pageindex, JSON_PRETTY_PRINT));
				
				if(isset($_GET["newpage"]))
					http_response_code(201);
				else
					http_response_code(200);
				
//				header("content-type: text/plain");
				header("location: index.php?page=$env->page&edit_status=success&redirect=no");
				exit();
			}
			else
			{
				http_response_code(507);
				exit(page_renderer::render_main("Error saving page - $settings->sitename", "<p>$settings->sitename failed to write your changes to the server's disk. Your changes have not been saved, but you might be able to recover your edit by pressing the back button in your browser.</p>
				<p>Please tell the administrator of this wiki (" . $settings->admindetails_name . ") about this problem.</p>"));
			}
		});
		
		add_help_section("15-editing", "Editing", "<p>To edit a page on $settings->sitename, click the edit button on the top bar. Note that you will probably need to be logged in. If you do not already have an account you will need to ask $settings->sitename's administrator for an account since there is no registration form. Note that the $settings->sitename's administrator may have changed these settings to allow anonymous edits.</p>
		<p>Editing is simple. The edit page has a sizeable box that contains a page's current contents. Once you are done altering it, add or change the comma separated list of tags in the field below the editor and then click save page.</p>
		<p>A reference to the syntax that $settings->sitename supports can be found below.</p>");
	}
]);




register_module([
	"name" => "Export",
	"version" => "0.4",
	"author" => "Starbeamrainbowlabs",
	"description" => "Adds a page that you can use to export your wiki as a .zip file. Uses \$settings->export_only_allow_admins, which controls whether only admins are allowed to export the wiki.",
	"id" => "page-export",
	"code" => function() {
		global $settings;
		
		/**
		 * @api		{get}	?action=export	Export the all the wiki's content
		 * @apiDescription	Export all the wiki's content. Please ask for permission before making a request to this URI. Note that some wikis may only allow moderators to export content.
		 * @apiName		Export
		 * @apiGroup	Utility
		 * @apiPermission	Anonymous
		 *
		 * @apiError	InsufficientExportPermissionsError	The wiki has the export_allow_only_admins option turned on, and you aren't logged into a moderator account.
		 * @apiError	CouldntOpenTempFileError		Pepperminty Wiki couldn't open a temporary file to send the compressed archive to.
		 * @apiError	CouldntCloseTempFileError		Pepperminty Wiki couldn't close the temporary file to finish creating the zip archive ready for downloading.
		 */
		
		/*
		 * ███████ ██   ██ ██████   ██████  ██████  ████████ 
		 * ██       ██ ██  ██   ██ ██    ██ ██   ██    ██    
		 * █████     ███   ██████  ██    ██ ██████     ██    
		 * ██       ██ ██  ██      ██    ██ ██   ██    ██    
		 * ███████ ██   ██ ██       ██████  ██   ██    ██    
		 */
		add_action("export", function() {
			global $settings, $pageindex, $env;
			
			if($settings->export_allow_only_admins && !$env->is_admin)
			{
				http_response_code(401);
				exit(page_renderer::render("Export error - $settings->sitename", "Only administrators of $settings->sitename are allowed to export the wiki as a zip. <a href='?action=$settings->defaultaction&page='>Return to the $settings->defaultpage</a>."));
			}
			
			$tmpfilename = tempnam(sys_get_temp_dir(), "pepperminty-wiki-");
			
			$zip = new ZipArchive();
			
			if($zip->open($tmpfilename, ZipArchive::CREATE) !== true)
			{
				http_response_code(507);
				exit(page_renderer::render("Export error - $settings->sitename", "Pepperminty Wiki was unable to open a temporary file to store the exported data in. Please contact $settings->sitename's administrator (" . $settings->admindetails_name . " at " . hide_email($settings->admindetails_email) . ") for assistance."));
			}
			
			foreach($pageindex as $entry)
			{
				$zip->addFile("$env->storage_prefix$entry->filename", $entry->filename);
			}
			
			if($zip->close() !== true)
			{
				http_response_code(500);
				exit(page_renderer::render("Export error - $settings->sitename", "Pepperminty wiki was unable to close the temporary zip file after creating it. Please contact $settings->sitename's administrator (" . $settings->admindetails_name . " at " . hide_email($settings->admindetails_email) . ") for assistance."));
			}
			
			header("content-type: application/zip");
			header("content-disposition: attachment; filename=$settings->sitename-export.zip");
			header("content-length: " . filesize($tmpfilename));
			
			$zip_handle = fopen($tmpfilename, "rb");
			fpassthru($zip_handle);
			fclose($zip_handle);
			unlink($tmpfilename);
		});
		
		// Add a section to the help page
		add_help_section("50-export", "Exporting", "<p>$settings->sitename supports exporting the entire wiki's content as a zip. Note that you may need to be a moderator in order to do this. Also note that you should check for permission before doing so, even if you are able to export without asking.</p>
		<p>To perform an export, go to the credits page and click &quot;Export as zip - Check for permission first&quot;.</p>");
	}
]);




register_module([
	"name" => "Help page",
	"version" => "0.9.3",
	"author" => "Starbeamrainbowlabs",
	"description" => "Adds a rather useful help page. Access through the 'help' action. This module also exposes help content added to Pepperminty Wiki's inbuilt invisible help section system.",
	"id" => "page-help",
	"code" => function() {
		global $settings;
		
		/**
		 * @api		{get}	?action=help[&dev=yes]	Get a help page
		 * @apiDescription	Get a customised help page. This page will be slightly different for every wiki, depending on their name, settings, and installed modules.
		 * @apiName		Help
		 * @apiGroup	Utility
		 * @apiPermission	Anonymous
		 *
		 * @apiParam	{string}	dev		Set to 'yes' to get a developer help page instead. The developer help page gives some general information about which modules and help page sections are registered, and other various (non-sensitive) settings.
		 */
		
		/*
		 * ██   ██ ███████ ██      ██████  
		 * ██   ██ ██      ██      ██   ██ 
		 * ███████ █████   ██      ██████  
		 * ██   ██ ██      ██      ██      
		 * ██   ██ ███████ ███████ ██      
		 */
		add_action("help", function() {
			global $env, $paths, $settings, $version, $help_sections, $actions;
			
			// Sort the help sections by key
			ksort($help_sections, SORT_NATURAL);
			
			if(isset($_GET["dev"]) and $_GET["dev"] == "yes")
			{
				$title = "Developers Help - $settings->sitename";
				$content = "<p>$settings->sitename runs on Pepperminty Wiki, an entire wiki packed into a single file. This page contains some information that developers may find useful.</p>
				<p>A full guide to developing a Pepperminty Wiki module can be found <a href='//github.com/sbrl/Pepperminty-Wiki/blob/master/Module_API_Docs.md#module-api-documentation'>on GitHub</a>.</p>
				<h3>Registered Help Sections</h3>
				<p>The following help sections are currently registered:</p>
				<table><tr><th>Index</th><th>Title</th><th>Length</th></tr>\n";
				$totalSize = 0;
				foreach($help_sections as $index => $section)
				{
					$sectionLength = strlen($section["content"]);
					$totalSize += $sectionLength;
					
					$content .= "\t\t\t<tr><td>$index</td><td>" . $section["title"] . "</td><td>" . human_filesize($sectionLength) . "</td></tr>\n";
				}
				$content .= "\t\t\t<tr><th colspan='2' style='text-align: right;'>Total:</th><td>" . human_filesize($totalSize) . "</td></tr>\n";
				$content .= "\t\t</table>\n";
				$content .= "<h3>Registered Actions</h3>
				<p>The following actions are currently registered:</p>\n";
				$content .= "<p>" . implode(", ", array_keys(get_object_vars($actions))) . "</p>";
				$content .= "<h3>Environment</h3>\n";
				$content .= "<ul>\n";
				$content .= "<li>$settings->sitename's root directory is " . (!is_writeable(__DIR__) ? "not " : "") . "writeable.</li>\n";
				$content .= "<li>The page index is currently " . human_filesize(filesize($paths->pageindex)) . " in size, and took " . $env->perfdata->pageindex_decode_time . "ms to decode.</li>";
				if(module_exists("feature-search"))
				{
					search::measure_invindex_load_time($paths->searchindex);
					$content .= "<li>The search index is currently " . human_filesize(filesize($paths->searchindex)) . " in size, and took " . $env->perfdata->searchindex_decode_time . "ms to decode.</li>";
				}
				
				$content .= "<li>The id index is currently " . human_filesize(filesize($paths->idindex)) . " in size, and took " . $env->perfdata->idindex_decode_time . "ms to decode.</li>";
				
				$wikiSize = 0;
				$wikiFiles = glob_recursive($env->storage_prefix . "*");
				foreach($wikiFiles as $filename)
				{
					if(endsWith($filename, ".php")) continue; // Skip php files
					$wikiSize += filesize($filename);
				}
				
				$content .= "<li>$settings->sitename is currently " . human_filesize($wikiSize) . " in size.</li>\n";
				
				$content .= "</ul>";
			}
			else
			{
				$title = "Help - $settings->sitename";
				
				$content = "	<h1>$settings->sitename Help</h1>
		<p>Welcome to $settings->sitename!</p>
		<p>$settings->sitename is powered by Pepperminty Wiki, a complete wiki in a box you can drop into your server and expect it to just <em>work</em>.</p>";
				
				// Todo Insert a table of contents here?
				
				foreach($help_sections as $index => $section)
				{
					// Todo add a button that you can click to get a permanent link
					// to this section.
					$content .= "<h2 id='$index' class='help-section-header'>" . $section["title"] . "</h2>\n";
					$content .= $section["content"] . "\n";
				}
			}
			
			exit(page_renderer::render_main($title, $content));
		});
		
		// Register a help section on general navigation
		add_help_section("5-navigation", "Navigating", "<p>All the navigation links can be found on the top bar, along with a search box (if your site administrator has enabled it). There is also a &quot;More...&quot; menu in the top right that contains some additional links that you may fine useful.</p>
		<p>This page, along with the credits page, can be found on the bar at the bottom of every page.</p>");
		
		add_help_section("999-extra", "Extra Information", "<p>You can find out whch version of Pepperminty Wiki $settings->sitename is using by visiting the <a href='?action=credits'>credits</a> page.</p>
		<p>Information for developers can be found on <a href='?action=help&dev=yes'>this page</a>.</p>");
	}
]);




register_module([
	"name" => "Page list",
	"version" => "0.10.2",
	"author" => "Starbeamrainbowlabs",
	"description" => "Adds a page that lists all the pages in the index along with their metadata.",
	"id" => "page-list",
	"code" => function() {
		global $settings;
		
		/**
		 * @api		{get}	?action=list	List all pages 
		 * @apiDescription	Gets a list of all the pages currently stored on the wiki.
		 * @apiName		ListPages
		 * @apiGroup	Page
		 * @apiPermission	Anonymous
		 */
		
		/*
		 * ██      ██ ███████ ████████ 
		 * ██      ██ ██         ██    
		 * ██      ██ ███████    ██    
		 * ██      ██      ██    ██    
		 * ███████ ██ ███████    ██    
		 */
		add_action("list", function() {
			global $pageindex, $settings;
			
			$title = "All Pages";
			$content = "	<h1>$title on $settings->sitename</h1>";
			
			$sorted_pageindex = get_object_vars($pageindex);
			ksort($sorted_pageindex, SORT_NATURAL);
			
			$content .= generate_page_list(array_keys($sorted_pageindex));
			exit(page_renderer::render_main("$title - $settings->sitename", $content));
		});
		
		/**
		 * @api		{get}	?action=list-tags[&tag=]	Get a list of tags or pages with a certain tag
		 * @apiDescription	Gets a list of all tags on the wiki. Adding the `tag` parameter causes a list of pages with the given tag to be returned instead.
		 * @apiName		ListTags
		 * @apiGroup	Utility
		 * @apiPermission	Anonymous
		 * 
		 * @apiParam	{string}	tag		Optional. If provided a list of all the pages with that tag is returned instead.
		 */
		
		/*
		 * ██      ██ ███████ ████████ ████████  █████   ██████  ███████ 
		 * ██      ██ ██         ██       ██    ██   ██ ██       ██      
		 * ██      ██ ███████    ██ █████ ██    ███████ ██   ███ ███████ 
		 * ██      ██      ██    ██       ██    ██   ██ ██    ██      ██ 
		 * ███████ ██ ███████    ██       ██    ██   ██  ██████  ███████ 
		 */
		add_action("list-tags", function() {
			global $pageindex, $settings;
			
			if(!isset($_GET["tag"]))
			{
				// Render a list of all tags
				$all_tags = [];
				foreach($pageindex as $entry)
				{
					if(!isset($entry->tags)) continue;
					foreach($entry->tags as $tag)
					{
						if(!in_array($tag, $all_tags)) $all_tags[] = $tag;
					}
				}
				
				sort($all_tags, SORT_NATURAL);
				
				$content = "<h1>All tags</h1>
				<ul class='tag-list'>\n";
				foreach($all_tags as $tag)
				{
					$content .= "			<li><a href='?action=list-tags&tag=" . rawurlencode($tag) . "' class='mini-tag'>$tag</a></li>\n";
				}
				$content .= "</ul>\n";
				
				exit(page_renderer::render("All tags - $settings->sitename", $content));
			}
			$tag = $_GET["tag"];
			
			
			$sorted_pageindex = get_object_vars($pageindex);
			ksort($sorted_pageindex, SORT_NATURAL);
			
			$pagelist = [];
			foreach($pageindex as $pagename => $pagedetails)
			{
				if(empty($pagedetails->tags)) continue;
				if(in_array($tag, $pagedetails->tags))
					$pagelist[] = $pagename;
			}
			
			$content = "<h1>Tag List: $tag</h1>\n";
			$content .= generate_page_list($pagelist);
			
			$content .= "<p>(<a href='?action=list-tags'>All tags</a>)</p>\n";
			
			exit(page_renderer::render("$tag - Tag List - $settings->sitename", $content));
		});
		
		add_help_section("30-all-pages-tags", "Listing pages and tags", "<p>All the pages and tags on $settings->sitename are listed on a pair of pages to aid navigation. The list of all pages on $settings->sitename can be found by clicking &quot;All Pages&quot; on the top bar. The list of all the tags currently in use can be found by clicking &quot;All Tags&quot; in the &quot;More...&quot; menu in the top right.</p>
		<p>Each tag on either page can be clicked, and leads to a list of all pages that possess that particular tag.</p>
		<p>Redirect pages are shown in italics. A page's last known editor is also shown next to each entry on a list of pages, along with the last known size (which should correct, unless it was changed outside of $settings->sitename) and the time since the last modification (hovering over this will show the exact time that the last modification was made in a tooltip).</p>");
	}
]);

function generate_page_list($pagelist)
{
	global $pageindex;
	// ✎ &#9998; 🕒 &#128338;
	$result = "<ul class='page-list'>\n";
	foreach($pagelist as $pagename)
	{
		// Construct a list of tags that are attached to this page ready for display
		$tags = "";
		// Make sure that this page does actually have some tags first
		if(isset($pageindex->$pagename->tags))
		{
			foreach($pageindex->$pagename->tags as $tag)
			{
				$tags .= "<a href='?action=list-tags&tag=" . rawurlencode($tag) . "' class='mini-tag'>$tag</a>, ";
			}
			$tags = substr($tags, 0, -2); // Remove the last ", " from the tag list
		}
		
		$pageDisplayName = $pagename;
		if(isset($pageindex->$pagename) and
			!empty($pageindex->$pagename->redirect))
			$pageDisplayName = "<em>$pageDisplayName</em>";
		
		$result .= "<li><a href='index.php?page=$pagename'>$pageDisplayName</a>
		<em class='size'>(" . human_filesize($pageindex->$pagename->size) . ")</em>
		<span class='editor'><span class='texticon cursor-query' title='Last editor'>&#9998;</span> " . $pageindex->$pagename->lasteditor . "</span>
		<time class='cursor-query' title='" . date("l jS \of F Y \a\\t h:ia T", $pageindex->$pagename->lastmodified) . "'>" . human_time_since($pageindex->$pagename->lastmodified) . "</time>
		<span class='tags'>$tags</span></li>";
	}
	$result .= "		</ul>\n";
	
	return $result;
}




register_module([
	"name" => "Login",
	"version" => "0.8.4",
	"author" => "Starbeamrainbowlabs",
	"description" => "Adds a pair of actions (login and checklogin) that allow users to login. You need this one if you want your users to be able to login.",
	"id" => "page-login",
	"code" => function() {
		global $settings;
		
		/**
		 * @api		{get}	?action=login[&failed=yes][&returnto={someUrl}]	Get the login page
		 * @apiName		Login
		 * @apiGroup	Authorisation
		 * @apiPermission	Anonymous
		 * 
		 * @apiParam	{string}	failed		Setting to yes causes a login failure message to be displayed above the login form.
		 * @apiParam	{string}	returnto	Set to the url to redirect to upon a successful login.
		 */
		
		/*
		 * ██       ██████   ██████  ██ ███    ██
		 * ██      ██    ██ ██       ██ ████   ██
		 * ██      ██    ██ ██   ███ ██ ██ ██  ██
		 * ██      ██    ██ ██    ██ ██ ██  ██ ██
		 * ███████  ██████   ██████  ██ ██   ████
		 */
		add_action("login", function() {
			global $settings, $env;
			
			// Build the action url that will actually perform the login
			$login_form_action_url = "index.php?action=checklogin";
			if(isset($_GET["returnto"]))
				$login_form_action_url .= "&returnto=" . rawurlencode($_GET["returnto"]);
			
			if($env->is_logged_in && !empty($_GET["returnto"]))
			{
				http_response_code(307);
				header("location: " . $_GET["returnto"]);
			}
			
			$title = "Login to $settings->sitename";
			$content = "<h1>Login to $settings->sitename</h1>\n";
			if(isset($_GET["failed"]))
				$content .= "\t\t<p><em>Login failed.</em></p>\n";
			if(isset($_GET["required"]))
				$content .= "\t\t<p><em>$settings->sitename requires that you login before continuing.</em></p>\n";
			$content .= "\t\t<form method='post' action='$login_form_action_url'>
				<label for='user'>Username:</label>
				<input type='text' name='user' id='user' autofocus />
				<br />
				<label for='pass'>Password:</label>
				<input type='password' name='pass' id='pass' />
				<br />
				<input type='submit' value='Login' />
			</form>\n";
			exit(page_renderer::render_main($title, $content));
		});
		
		/**
		 * @api		{post}	?action=checklogin	Perform a login
		 * @apiName		CheckLogin
		 * @apiGroup	Authorisation
		 * @apiPermission	Anonymous
		 * 
		 * @apiParam	{string}	user		The user name to login with.
		 * @apiParam	{string}	password	The password to login with.
		 * @apiParam	{string}	returnto	The URL to redirect to upon a successful login.
		 *
		 * @apiError	InvalidCredentialsError	The supplied credentials were invalid. Note that this error is actually a redirect to ?action=login&failed=yes (with the returnto parameter appended if you supplied one)
		 */
		
		/*
 		 * ██████ ██   ██ ███████  ██████ ██   ██
		 * ██      ██   ██ ██      ██      ██  ██
		 * ██      ███████ █████   ██      █████
		 * ██      ██   ██ ██      ██      ██  ██
 		 * ██████ ██   ██ ███████  ██████ ██   ██
 		 * 
		 * ██       ██████   ██████  ██ ███    ██
		 * ██      ██    ██ ██       ██ ████   ██
		 * ██      ██    ██ ██   ███ ██ ██ ██  ██
		 * ██      ██    ██ ██    ██ ██ ██  ██ ██
		 * ███████  ██████   ██████  ██ ██   ████
		 */
		add_action("checklogin", function() {
			global $settings, $env;
			
			//actually do the login
			if(isset($_POST["user"]) and isset($_POST["pass"]))
			{
				//the user wants to log in
				$user = $_POST["user"];
				$pass = $_POST["pass"];
				if($settings->users->$user == hash_password($pass))
				{
					$env->is_logged_in = true;
					$expiretime = time() + 60*60*24*30; //30 days from now
					$_SESSION["$settings->sessionprefix-user"] = $user;
					$_SESSION["$settings->sessionprefix-pass"] = hash_password($pass);
					$_SESSION["$settings->sessionprefix-expiretime"] = $expiretime;
					//redirect to wherever the user was going
					http_response_code(302);
					if(isset($_GET["returnto"]))
						header("location: " . $_GET["returnto"]);
					else
						header("location: index.php");
					exit();
				}
				else
				{
					http_response_code(302);
					$nextUrl = "index.php?action=login&failed=yes";
					if(!empty($_GET["returnto"]))
						$nextUrl .= "&returnto=" . rawurlencode($_GET["returnto"]);
					header("location: $nextUrl");
					exit();
				}
			}
			else
			{
				http_response_code(302);
				$nextUrl = "index.php?action=login&failed=yes&badrequest=yes";
				if(!empty($_GET["returnto"]))
					$nextUrl .= "&returnto=" . rawurlencode($_GET["returnto"]);
				header("location: $nextUrl");
				exit();
			}
		});
		
		// Register a section on logging in on the help page.
		add_help_section("30-login", "Logging in", "<p>In order to edit $settings->sitename and have your edit attributed to you, you need to be logged in. Depending on the settings, logging in may be a required step if you want to edit at all. Thankfully, loggging in is not hard. Simply click the &quot;Login&quot; link in the top left, type your username and password, and then click login.</p>
		<p>If you do not have an account yet and would like one, try contacting <a href='mailto:" . hide_email($settings->admindetails_email) . "'>$settings->admindetails_name</a>, $settings->sitename's administrator and ask them nicely to see if they can create you an account.</p>");
	}
]);

/*
 * @summary Hashes the given password according to the current settings defined
 * 			in $settings.
 * 
 * @param $pass {string} The password to hash.
 * 
 * @returns {string} The hashed password. Uses sha3 if $settings->use_sha3 is
 * 					 enabled, or sha256 otherwise.
 */
function hash_password($pass)
{
	global $settings;
	if($settings->use_sha3)
	{
		return sha3($pass, 256);
	}
	else
	{
		return hash("sha256", $pass);
	}
}




register_module([
	"name" => "Logout",
	"version" => "0.6",
	"author" => "Starbeamrainbowlabs",
	"description" => "Adds an action to let users user out. For security reasons it is wise to add this module since logging in automatically opens a session that is valid for 30 days.",
	"id" => "page-logout",
	"code" => function() {
		
		/**
		 * @api		{post}	?action=logout	Logout
		 * @apiDescription	Logout. Make sure that your bot requests this URL when it is finished - this call not only clears your cookies but also clears the server's session file as well. Note that you can request this when you are already logged out and it will completely wipe your session on the server.
		 * @apiName		Logout
		 * @apiGroup	Authorisation
		 * @apiPermission	Anonymous
		 */
		
		/*
		 * ██       ██████   ██████   ██████  ██    ██ ████████ 
		 * ██      ██    ██ ██       ██    ██ ██    ██    ██    
		 * ██      ██    ██ ██   ███ ██    ██ ██    ██    ██    
		 * ██      ██    ██ ██    ██ ██    ██ ██    ██    ██    
		 * ███████  ██████   ██████   ██████   ██████     ██    
		 */
		add_action("logout", function() {
			global $env;
			$env->is_logged_in = false;
			unset($env->user);
			unset($env->pass);
			//clear the session variables
			$_SESSION = [];
			session_destroy();
			
			exit(page_renderer::render_main("Logout Successful", "<h1>Logout Successful</h1>
		<p>Logout Successful. You can login again <a href='index.php?action=login'>here</a>.</p>"));
		});
	}
]);




register_module([
	"name" => "Page mover",
	"version" => "0.9.2",
	"author" => "Starbeamrainbowlabs",
	"description" => "Adds an action to allow administrators to move pages.",
	"id" => "page-move",
	"code" => function() {
		global $settings;
		
		/**
		 * @api		{get}	?action=move[&new_name={newPageName}]	Move a page
		 * @apiName		Move
		 * @apiGroup	Page
		 * @apiPermission	Moderator
		 * 
		 * @apiParam	{string}	new_name	The new name to move the page to. If not set a page will be returned containing a move page form.
		 *
		 * @apiUse UserNotModeratorError
		 * @apiError	EditingDisabledError	Editing is disabled on this wiki, so pages can't be moved.
		 * @apiError	PageExistsAtDestinationError	A page already exists with the specified new name.
		 * @apiError	NonExistentPageError		The page you're trying to move doesn't exist in the first place.
		 * @apiError	PreExistingFileError		A pre-existing file on the server's file system was detected.
		 */
		
		/*
		 * ███    ███  ██████  ██    ██ ███████ 
		 * ████  ████ ██    ██ ██    ██ ██      
		 * ██ ████ ██ ██    ██ ██    ██ █████   
		 * ██  ██  ██ ██    ██  ██  ██  ██      
		 * ██      ██  ██████    ████   ███████ 
		 */
		add_action("move", function() {
			global $pageindex, $settings, $env, $paths;
			if(!$settings->editing)
			{
				exit(page_renderer::render_main("Moving $env->page - error", "<p>You tried to move $env->page, but editing is disabled on this wiki.</p>
				<p>If you wish to move this page, please re-enable editing on this wiki first.</p>
				<p><a href='index.php?page=$env->page'>Go back to $env->page</a>.</p>
				<p>Nothing has been changed.</p>"));
			}
			if(!$env->is_admin)
			{
				exit(page_renderer::render_main("Moving $env->page - Error", "<p>You tried to move $env->page, but you do not have permission to do that.</p>
				<p>You should try <a href='index.php?action=login'>logging in</a> as an admin.</p>"));
			}
			
			if(!isset($_GET["new_name"]) or strlen($_GET["new_name"]) == 0)
				exit(page_renderer::render_main("Moving $env->page", "<h2>Moving $env->page</h2>
				<form method='get' action='index.php'>
					<input type='hidden' name='action' value='move' />
					<label for='old_name'>Old Name:</label>
					<input type='text' name='page' value='$env->page' readonly />
					<br />
					<label for='new_name'>New Name:</label>
					<input type='text' name='new_name' />
					<br />
					<input type='submit' value='Move Page' />
				</form>"));
			
			$new_name = makepathsafe($_GET["new_name"]);
			
			$page = $env->page;
			if(!isset($pageindex->$page))
				exit(page_renderer::render_main("Moving $env->page - Error", "<p>You tried to move $env->page to $new_name, but the page with the name $env->page does not exist in the first place.</p>
				<p>Nothing has been changed.</p>"));
			
			if($env->page == $new_name)
				exit(page_renderer::render_main("Moving $env->page - Error", "<p>You tried to move $page, but the new name you gave is the same as it's current name.</p>
				<p>It is possible that you tried to use some characters in the new name that are not allowed and were removed.</p>
				<p>Page names may not contain any of these characters: <code>?%*:|\"&gt;&lt;()[]</code></p>"));
			
			if(isset($pageindex->$page->uploadedfile) and
				file_exists($new_name))
				exit(page_renderer::render_main("Moving $env->page - Error - $settings->sitename", "<p>Whilst moving the file associated with $env->page, $settings->sitename detected a pre-existing file on the server's file system. Because $settings->sitename can't determine whether the existing file is important to another component of $settings->sitename or it's host web server, the move have been aborted - just in case.</p>
				<p>If you know that this move is actually safe, please get your site administrator (" . $settings->admindetails_name . ") to perform the move manually. Their contact address can be found at the bottom of every page (including this one).</p>"));
			
			// Move the page in the page index
			$pageindex->$new_name = new stdClass();
			foreach($pageindex->$page as $key => $value)
			{
				$pageindex->$new_name->$key = $value;
			}
			unset($pageindex->$page);
			$pageindex->$new_name->filename = "$new_name.md";
			
			// If this page has an associated file, then we should move that too
			if(!empty($pageindex->$new_name->uploadedfile))
			{
				// Update the filepath to point to the description and not the image
				$pageindex->$new_name->filename = $pageindex->$new_name->filename . ".md";
				// Move the file in the pageindex
				$pageindex->$new_name->uploadedfilepath = $new_name;
				// Move the file on disk
				rename($env->storage_prefix . $env->page, $env->storage_prefix . $new_name);
			}
			
			// Come to think about it, we should probably move the history while we're at it
			foreach($pageindex->$new_name->history as &$revisionData)
			{
				// We're only interested in edits
				if($revisionData->type !== "edit") continue;
				$newRevisionName = $pageindex->$new_name->filename . ".r$revisionData->rid";
				// Move the revision to it's new name
				rename(
					$env->storage_prefix . $revisionData->filename,
					$env->storage_prefix . $newRevisionName
				);
				// Update the pageindex entry
				$revisionData->filename = $newRevisionName;
			}
			
			// Save the updated pageindex
			file_put_contents($paths->pageindex, json_encode($pageindex, JSON_PRETTY_PRINT));
			
			// Move the page on the disk
			rename("$env->storage_prefix$env->page.md", "$env->storage_prefix$new_name.md");
			
			// Move the page in the id index
			ids::movepagename($page, $new_name);
			
			// Exit with a nice message
			exit(page_renderer::render_main("Moving $env->page", "<p><a href='index.php?page=$env->page'>$env->page</a> has been moved to <a href='index.php?page=$new_name'>$new_name</a> successfully.</p>"));
		});
		
		// Register a help section
		add_help_section("60-move", "Moving Pages", "<p>If you are logged in as an administrator, then you have the power to move pages. To do this, click &quot;Delete&quot; in the &quot;More...&quot; menu when browsing the pge you wish to move. Type in the new name of the page, and then click &quot;Move Page&quot;.</p>");
	}
]);




register_module([
	"name" => "Update",
	"version" => "0.6.2",
	"author" => "Starbeamrainbowlabs",
	"description" => "Adds an update page that downloads the latest stable version of Pepperminty Wiki. This module is currently outdated as it doesn't save your module preferences.",
	"id" => "page-update",
	"code" => function() {
		
		/**
		 * @api		{get}	?action=update[do=yes]	Update the wiki
		 * @apiDescription	Update the wiki by downloading  a new version of Pepperminty Wiki from the URL specified in the settings. Note that unless you change the url from it's default, all custom modules installed will be removed. **Note also that this plugin is currently out of date. Use with extreme caution!**
		 * @apiName			Update
		 * @apiGroup		Utility
		 * @apiPermission	Moderator
		 * 
		 * @apiParam	{string}	do		Set to 'yes' to actually do the upgrade. Omission causes a page asking whether an update is desired instead.
		 * @apiParam	{string}	secret	The wiki's secret string that's stored in the settings.
		 *
		 * @apiUse UserNotModeratorError
		 * @apiParam	InvalidSecretError	The supplied secret doesn't match up with the secret stored in the wiki's settings.
		 */
		
		/*
		 * ██    ██ ██████  ██████   █████  ████████ ███████ 
		 * ██    ██ ██   ██ ██   ██ ██   ██    ██    ██      
		 * ██    ██ ██████  ██   ██ ███████    ██    █████   
		 * ██    ██ ██      ██   ██ ██   ██    ██    ██      
		 *  ██████  ██      ██████  ██   ██    ██    ███████ 
		 */
		add_action("update", function() {
			global $settings, $env;
			
			if(!$env->is_admin)
			{
				http_response_code(401);
				exit(page_renderer::render_main("Update - Error", "<p>You must be an administrator to do that.</p>"));
			}
			
			if(!isset($_GET["do"]) or $_GET["do"] !== "true" or $_GET["do"] !== "yes")
			{
				exit(page_renderer::render_main("Update $settings->sitename", "<p>This page allows you to update $settings->sitename.</p>
				<p>Currently, $settings->sitename is using $settings->version of Pepperminty Wiki.</p>
				<p>This script will automatically download and install the latest version of Pepperminty Wiki from the url of your choice (see settings), regardless of whether an update is actually needed (version checking isn't implemented yet).</p>
				<p>To update $settings->sitename, fill out the form below and click click the update button.</p>
				<p>Note that a backup system has not been implemented yet! If this script fails you will loose your wiki's code and have to re-build it.</p>
				<form method='get' action=''>
					<input type='hidden' name='action' value='update' />
					<input type='hidden' name='do' value='true' />
					<label for='secret'>$settings->sitename's secret code</label>
					<input type='text' name='secret' value='' />
					<input type='submit' value='Update' />
				</form>"));
			}
			
			if(!isset($_GET["secret"]) or $_GET["secret"] !== $settings->sitesecret)
			{
				exit(page_renderer::render_main("Update $settings->sitename - Error", "<p>You forgot to enter $settings->sitename's secret code or entered it incorrectly. $settings->sitename's secret can be found in the settings portion of <code>index.php</code>.</p>"));
			}
			
			$settings_separator = "/////////////// Do not edit below this line unless you know what you are doing! ///////////////";
			
			$log = "Beginning update...\n";
			
			$log .= "I am <code>" . __FILE__ . "</code>.\n";
			$oldcode = file_get_contents(__FILE__);
			$log .= "Fetching new code...";
			$newcode = file_get_contents($settings->updateurl);
			$log .= "done.\n";
			
			$log .= "Rewriting <code>" . __FILE__ . "</code>...";
			$settings = substr($oldcode, 0, strpos($oldcode, $settings_separator));
			$code = substr($newcode, strpos($newcode, $settings_separator));
			$result = $settings . $code;
			$log .= "done.\n";
			
			$log .= "Saving...";
			file_put_contents(__FILE__, $result);
			$log .= "done.\n";
			
			$log .= "Update complete. I am now running on the latest version of Pepperminty Wiki.";
			$log .= "The version number that I have updated to can be found on the credits or help ages.";
			
			exit(page_renderer::render_main("Update - Success", "<ul><li>" . implode("</li><li>", explode("\n", $log)) . "</li></ul>"));
		});
	}
]);



register_module([
	"name" => "Page viewer",
	"version" => "0.16.4",
	"author" => "Starbeamrainbowlabs",
	"description" => "Allows you to view pages. You really should include this one.",
	"id" => "page-view",
	"code" => function() {
		/**
		 * @api	{get}	?action=view[&page={pageName}][&revision=rid][&printable=yes]	View a page
		 * @apiName			View
		 * @apiGroup		Page
		 * @apiPermission	Anonymous
		 * 
		 * @apiUse PageParameter
		 * @apiParam	{number}	revision	The revision number to display.
		 * @apiParam	{string}	mode		Optional. The display mode to use. Can hld the following values: 'normal' - The default. Sends a normal page. 'printable' - Sends a printable version of the page. 'contentonly' - Sends only the content of the page, not the extra stuff around it. 'parsedsourceonly' - Sends only the raw rendered source of the page, as it appears just after it has come out of the page parser. Useful for writing external tools (see also the `raw` action).
		 *
		 * @apiError	NonExistentPageError	The page doesn't exist and editing is disabled in the wiki's settings. If editing isn't disabled, you will be redirected to the edit page instead.
		 * @apiError	NonExistentRevisionError	The specified revision was not found.
		 */
		
		/*
		 * ██    ██ ██ ███████ ██     ██ 
		 * ██    ██ ██ ██      ██     ██ 
		 * ██    ██ ██ █████   ██  █  ██ 
		 *  ██  ██  ██ ██      ██ ███ ██ 
		 *   ████   ██ ███████  ███ ███  
		 */
		add_action("view", function() {
			global $pageindex, $settings, $env;
			
			// Check to make sure that the page exists
			$page = $env->page;
			if(!isset($pageindex->$page))
			{
				// todo make this intelligent so we only redirect if the user is acutally able to create the page
				if($settings->editing)
				{
					// Editing is enabled, redirect to the editing page
					http_response_code(307); // Temporary redirect
					header("location: index.php?action=edit&newpage=yes&page=" . rawurlencode($env->page));
					exit();
				}
				else
				{
					// Editing is disabled, show an error message
					http_response_code(404);
					exit(page_renderer::render_main("404: Page not found - $env->page - $settings->sitename", "<p>$env->page does not exist.</p><p>Since editing is currently disabled on this wiki, you may not create this page. If you feel that this page should exist, try contacting this wiki's Administrator.</p>"));
				}
			}
			
			// Perform a redirect if the requested page is a redirect page
			if(isset($pageindex->$page->redirect) &&
			   $pageindex->$page->redirect === true)
			{
				$send_redirect = true;
				if(isset($_GET["redirect"]) && $_GET["redirect"] == "no")
					$send_redirect = false;
				
				if($send_redirect)
				{
					// Todo send an explanatory page along with the redirect
					http_response_code(307);
					$redirectUrl = "?action=$env->action&redirected_from=$env->page";
					
					$hashCode = "";
					$newPage = $pageindex->$page->redirect_target;
					if(strpos($newPage, "#") !== false)
					{
						// Extract the part after the hash symbol
						$hashCode = substr($newPage, strpos($newPage, "#") + 1);
						// Remove the hash from the new page name
						$newPage = substr($newPage, 0, strpos($newPage, "#"));
					}
					$redirectUrl .= "&page=$newPage";
					if(!empty($pageindex->$newPage->redirect))
						$redirectUrl .= "&redirect=no";
					if(strlen($hashCode) > 0)
						$redirectUrl .= "#$hashCode";
					
					header("location: $redirectUrl");
					exit();
				}
			}
			
			$title = "$env->page - $settings->sitename";
			if(isset($pageindex->$page->protect) && $pageindex->$page->protect === true)
				$title = $settings->protectedpagechar . $title;
			$content = "";
			if(!$env->is_history_revision)
				$content .= "<h1>$env->page</h1>\n";
			else
			{
				$content .= "<h1>Revision #{$env->history->revision_number} of $env->page</h1>\n";
				$content .= "<p class='revision-note'><em>(Revision saved by {$env->history->revision_data->editor} " . render_timestamp($env->history->revision_data->timestamp) . ". <a href='?page=" . rawurlencode($env->page) . "'>Jump to the current revision</a> or see a <a href='?action=history&page=" . rawurlencode($env->page) . "'>list of all revisions</a> for this page.)</em></p>\n";
			}
			
			// Add an extra message if the requester was redirected from another page
			if(isset($_GET["redirected_from"]))
				$content .= "<p><em>Redirected from <a href='?page=" . rawurlencode($_GET["redirected_from"]) . "&redirect=no'>" . $_GET["redirected_from"] . "</a>.</em></p>";
			
			$parsing_start = microtime(true);
			
			$rawRenderedSource = parse_page_source(file_get_contents($env->page_filename));
			$content .= $rawRenderedSource;
			
			if(!empty($pageindex->$page->tags))
			{
				$content .= "<ul class='page-tags-display'>\n";
				foreach($pageindex->$page->tags as $tag)
				{
					$content .= "<li><a href='?action=list-tags&tag=" . rawurlencode($tag) . "'>$tag</a></li>\n";
				}
				$content .= "\n</ul>\n";
			}
			/*else
			{
				$content .= "<aside class='page-tags-display'><small><em>(No tags yet! Add some by <a href='?action=edit&page=" . rawurlencode($env->page) .  "'>editing this page</a>!)</em></small></aside>\n";
			}*/
			
			if($settings->show_subpages)
			{
				$subpages = get_object_vars(get_subpages($pageindex, $env->page));
				
				if(count($subpages) > 0)
				{
					$content .= "<hr />";
					$content .= "Subpages: ";
					foreach($subpages as $subpage => $times_removed)
					{
						if($times_removed <= $settings->subpages_display_depth)
						{
							$content .= "<a href='?action=view&page=" . rawurlencode($subpage) . "'>$subpage</a>, ";
						}
					}
					// Remove the last comma from the content
					$content = substr($content, 0, -2);
				}
			}
			
			$content .= "\n\t\t<!-- Took " . round((microtime(true) - $parsing_start) * 1000, 2) . "ms to parse page source -->\n";
			
			// Prevent indexing of this page if it's still within the noindex
			// time period
			if(isset($settings->delayed_indexing_time) and
				time() - $pageindex->{$env->page}->lastmodified < $settings->delayed_indexing_time)
				header("x-robots-tag: noindex");
			
			$settings->footer_message = "Last edited at " . date('h:ia T \o\n j F Y', $pageindex->{$env->page}->lastmodified) . ".</p>\n<p>" . $settings->footer_message; // Add the last edited time to the footer
			
			$mode = isset($_GET["mode"]) ? strtolower(trim($_GET["mode"])) : "normal";
			switch($mode)
			{
				case "contentonly":
					// Content only mode: Send only the content of the page
					exit($content);
				case "parsedsourceonly":
					// Parsed source only mode: Send only the raw rendered source
					exit($rawRenderedSource);
				case "printable":
					// Printable mode: Sends a printable version of the page
					exit(page_renderer::render_minimal($title, $content));
				case "normal":
				default:
					// Normal mode: Send a normal page
					exit(page_renderer::render_main($title, $content));
			}
		});
	}
]);




register_module([
	"name" => "Parsedown",
	"version" => "0.9.7",
	"author" => "Emanuil Rusev & Starbeamrainbowlabs",
	"description" => "An upgraded (now default!) parser based on Emanuil Rusev's Parsedown Extra PHP library (https://github.com/erusev/parsedown-extra), which is licensed MIT. Please be careful, as this module adds some weight to your installation, and also *requires* write access to the disk on first load.",
	"id" => "parser-parsedown",
	"code" => function() {
		global $settings;
		
		$parser = new PeppermintParsedown();
		$parser->setInternalLinkBase("?page=%s");
		add_parser("parsedown", function($source) use ($parser) {
			global $settings;
			if($settings->clean_raw_html)
				$parser->setMarkupEscaped(true);
			else
				$parser->setMarkupEscaped(false);
			$result = $parser->text($source);
			
			return $result;
		});
		
		add_help_section("20-parser-default", "Editor Syntax",
		"<p>$settings->sitename's editor uses an extended version of <a href='http://parsedown.org/'>Parsedown</a> to render pages, which is a fantastic open source Github flavoured markdown parser. You can find a quick reference guide on Github flavoured markdown <a href='https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet'>here</a> by <a href='https://github.com/adam-p/'>adam-p</a>, or if you prefer a book <a href='https://www.gitbook.com/book/roachhd/master-markdown/details'>Mastering Markdown</a> by KB is a good read, and free too!</p>
		<h3>Tips</h3>
		<ul>
			<li>Put 2 spaces at the end of a line to add a soft line break. Leave a blank line to add a head line break (i.e. a new paragraph).</li>
			<li>You can add an id to a header that you can link to. Put it in curly braces after the heading name like this: <code># Heading Name {#HeadingId}</code>. Then you can link to like like this: <code>[[Page name#HeadingId}]]</code>. You can also link to a heading id on the current page by omitting the page name: <code>[[#HeadingId]]</code>.</li>
		</ul>
		<h3>Extra Syntax</h3>
		<p>$settings->sitename's editor also supports some extra custom syntax, some of which is inspired by <a href='https://mediawiki.org/'>Mediawiki</a>.
		<table>
			<tr><th style='width: 40%'>Type this</th><th style='width: 20%'>To get this</th><th>Comments</th></th>
			<tr><td><code>[[Internal link]]</code></td><td><a href='?page=Internal%20link'>Internal Link</a></td><td>An internal link.</td></tr>
			<tr><td><code>[[Display Text|Internal link]]</code></td><td><a href='?page=Internal%20link'>Display Text</a></td><td>An internal link with some display text.</td></tr>
			<tr><td><code>![Alt text](http://example.com/path/to/image.png | 256x256 | right)</code></td><td><img src='http://example.com/path/to/image.png' alt='Alt text' style='float: right; max-width: 256px; max-height: 256px;' /></td><td>An image floating to the right of the page that fits inside a 256px x 256px box, preserving aspect ratio.</td></tr>
			<tr><td><code>![Alt text](http://example.com/path/to/image.png | 256x256 | caption)</code></td><td><figure><img src='http://example.com/path/to/image.png' alt='Alt text' style='max-width: 256px; max-height: 256px;' /><figcaption>Alt text</figcaption></figure></td><td>An image with a caption that fits inside a 256px x 256px box, preserving aspect ratio. The caption is taken from the alt text.</td></tr>
			<tr><td><code>![Alt text](Files/Cheese.png)</code></td><td><img src='index.php?action=preview&page=Files/Cheese.png' alt='Alt text' style='' /></td><td>An example of the short url syntax for images. Simply enter the page name of an image (or video / audio file), and Pepperminty Wiki will sort out the url for you.</td></tr>
		</table>
		<p>Note that the all image image syntax above can be mixed and matched to your liking. The <code>caption</code> option in particular must come last or next to last.</p>
		<h4>Templating</h4>
		<p>$settings->sitename also supports including one page in another page as a <em>template</em>. The syntax is very similar to that of Mediawiki. For example, <code>{{Announcement banner}}</code> will include the contents of the \"Announcement banner\" page, assuming it exists.</p>
		<p>You can also use variables. Again, the syntax here is very similar to that of Mediawiki - they can be referenced in the included page by surrrounding the variable name in triple curly braces (e.g. <code>{{{Announcement text}}}</code>), and set when including a page with the bar syntax (e.g. <code>{{Announcement banner | importance = high | text = Maintenance has been planned for tonight.}}</code>). Currently the only restriction in templates and variables is that you may not include a closing curly brace (<code>}</code>) in the page name, variable name, or value.</p>
		<h5>Special Variables</h5>
		<p>$settings->sitename also supports a number of special built-in variables. Their syntax and function are described below:</p>
		<table>
			<tr><th>Type this</th><th>To get this</th></tr>
			<tr><td><code>{{{@}}}</code></td><td>Lists all variables and their values in a table.</td></tr>
			<tr><td><code>{{{#}}}</code></td><td>Shows a 'stack trace', outlining all the parent includes of the current page being parsed.</td></tr>
			<tr><td><code>{{{~}}}</code></td><td>Outputs the requested page's name.</td></tr>
			<tr><td><code>{{{*}}}</code></td><td>Outputs a comma separated list of all the subpages of the current page.</td></tr>
			<tr><td><code>{{{+}}}</code></td><td>Shows a gallery containing all the files that are sub pages of the current page.</td></tr>
		</table>");
	}
]);

/*** Parsedown versions ***
 * Parsedown Core: 1.6.0  *
 * Parsedown Extra: 0.7.0 *
 **************************/
$env->parsedown_paths = new stdClass();
$env->parsedown_paths->parsedown = "https://cdn.rawgit.com/erusev/parsedown/3ebbd730b5c2cf5ce78bc1bf64071407fc6674b7/Parsedown.php";
$env->parsedown_paths->parsedown_extra = "https://cdn.rawgit.com/erusev/parsedown-extra/11a44e076d02ffcc4021713398a60cd73f78b6f5/ParsedownExtra.php";

// Download parsedown and parsedown extra if they don't already exist
if(!file_exists("./Parsedown.php") || filesize("./Parsedown.php") === 0)
	file_put_contents("./Parsedown.php", fopen($env->parsedown_paths->parsedown, "r"));
if(!file_exists("./ParsedownExtra.php") || filesize("./ParsedownExtra.php") === 0)
	file_put_contents("./ParsedownExtra.php", fopen($env->parsedown_paths->parsedown_extra, "r"));

require_once("./Parsedown.php");
require_once("./ParsedownExtra.php");

/*
 * ██████   █████  ██████  ███████ ███████ ██████   ██████  ██     ██ ███    ██
 * ██   ██ ██   ██ ██   ██ ██      ██      ██   ██ ██    ██ ██     ██ ████   ██
 * ██████  ███████ ██████  ███████ █████   ██   ██ ██    ██ ██  █  ██ ██ ██  ██
 * ██      ██   ██ ██   ██      ██ ██      ██   ██ ██    ██ ██ ███ ██ ██  ██ ██
 * ██      ██   ██ ██   ██ ███████ ███████ ██████   ██████   ███ ███  ██   ████
 * 
 * ███████ ██   ██ ████████ ███████ ███    ██ ███████ ██  ██████  ███    ██ ███████
 * ██       ██ ██     ██    ██      ████   ██ ██      ██ ██    ██ ████   ██ ██
 * █████     ███      ██    █████   ██ ██  ██ ███████ ██ ██    ██ ██ ██  ██ ███████
 * ██       ██ ██     ██    ██      ██  ██ ██      ██ ██ ██    ██ ██  ██ ██      ██
 * ███████ ██   ██    ██    ███████ ██   ████ ███████ ██  ██████  ██   ████ ███████
*/
class PeppermintParsedown extends ParsedownExtra
{
	private $internalLinkBase = "./%s";
	
	protected $maxParamDepth = 0;
	protected $paramStack = [];
	
	function __construct()
	{
		// Prioritise our internal link parsing over the regular link parsing
		array_unshift($this->InlineTypes["["], "InternalLink");
		// Prioritise our image parser over the regular image parser
		array_unshift($this->InlineTypes["!"], "ExtendedImage");
		
		$this->inlineMarkerList .= "{";
		if(!isset($this->InlineTypes["{"]) or !is_array($this->InlineTypes["{"]))
			$this->InlineTypes["{"] = [];
		$this->InlineTypes["{"][] = "Template";
	}
	
	/*
	 * ████████ ███████ ███    ███ ██████  ██       █████  ████████ ██ ███    ██  ██████
	 *    ██    ██      ████  ████ ██   ██ ██      ██   ██    ██    ██ ████   ██ ██
	 *    ██    █████   ██ ████ ██ ██████  ██      ███████    ██    ██ ██ ██  ██ ██   ███
	 *    ██    ██      ██  ██  ██ ██      ██      ██   ██    ██    ██ ██  ██ ██ ██    ██
	 *    ██    ███████ ██      ██ ██      ███████ ██   ██    ██    ██ ██   ████  ██████
	 */
	protected function inlineTemplate($fragment)
	{
		global $env, $pageindex;
		
		// Variable parsing
		if(preg_match("/\{\{\{([^}]+)\}\}\}/", $fragment["text"], $matches))
		{
			$params = [];
			if(!empty($this->paramStack))
			{
				$stackEntry = array_slice($this->paramStack, -1)[0];
				$params = !empty($stackEntry) ? $stackEntry["params"] : false;
			}
			
			$variableKey = trim($matches[1]);
			
			$variableValue = false;
			switch ($variableKey)
			{
				case "@": // Lists all variables and their values
					if(!empty($params))
					{
						$variableValue = "<table>
	<tr><th>Key</th><th>Value</th></tr>\n";
						foreach($params as $key => $value)
						{
							$variableValue .= "\t<tr><td>" . $this->escapeText($key) . "</td><td>" . $this->escapeText($value) . "</td></tr>\n";
						}
						$variableValue .= "</table>";
					}
					break;
				case "#": // Shows a stack trace
					$variableValue = "<ol start=\"0\">\n";
					$variableValue .= "\t<li>$env->page</li>\n";
					foreach($this->paramStack as $curStackEntry)
					{
						$variableValue .= "\t<li>" . $curStackEntry["pagename"] . "</li>\n";
					}
					$variableValue .= "</ol>\n";
					break;
				case "~": // Show requested page's name
					if(!empty($this->paramStack))
						$variableValue = $this->escapeText($env->page);
					break;
				case "*": // Lists subpages
					$subpages = get_subpages($pageindex, $env->page);
					$variableValue = [];
					foreach($subpages as $pagename => $depth)
					{
						$variableValue[] = $pagename;
					}
					$variableValue = implode(", ", $variableValue);
					if(strlen($variableValue) === 0)
						$variableValue = "<em>(none yet!)</em>";
					break;
				case "+": // Shows a file gallery for subpages with files
					// If the upload module isn't present, then there's no point
					// in checking for uploaded files
					if(!module_exists("feature-upload"))
						break;
					
					$variableValue = [];
					$subpages = get_subpages($pageindex, $env->page);
					foreach($subpages as $pagename => $depth)
					{
						// Make sure that this is an uploaded file
						if(!$pageindex->$pagename->uploadedfile)
							continue;
						
						$mime_type = $pageindex->$pagename->uploadedfilemime;
						
						$previewSize = 300;
						$previewUrl = "?action=preview&size=$previewSize&page=" . rawurlencode($pagename);
						
						$previewHtml = "";
						switch(substr($mime_type, 0, strpos($mime_type, "/")))
						{
							case "video":
								$previewHtml .= "<video src='$previewUrl' controls preload='metadata'>$pagename</video>\n";
								break;
							case "audio":
								$previewHtml .= "<audio src='$previewUrl' controls preload='metadata'>$pagename</audio>\n";
								break;
							case "application":
							case "image":
							default:
								$previewHtml .= "<img src='$previewUrl' />\n";
								break;
						}
						$previewHtml = "<a href='?page=" . rawurlencode($pagename) . "'>$previewHtml$pagename</a>";
						
						$variableValue[$pagename] = "<li style='min-width: $previewSize" . "px; min-height: $previewSize" . "px;'>$previewHtml</li>";
					}
					
					if(count($variableValue) === 0)
						$variableValue["default"] = "<li><em>(No files found)</em></li>\n";
					$variableValue = implode("\n", $variableValue);
					$variableValue = "<ul class='file-gallery'>$variableValue</ul>";
					break;
			}
			if(isset($params[$variableKey]))
			{
				$variableValue = $params[$variableKey];
				$variableValue = $this->escapeText($variableValue);
			}
			
			if($variableValue !== false)
			{
				return [
					"extent" => strlen($matches[0]),
					"markup" => $variableValue
				];
			}
		}
		else if(preg_match("/\{\{([^}]+)\}\}/", $fragment["text"], $matches))
		{
			$templateElement = $this->templateHandler($matches[1]);
			
			if(!empty($templateElement))
			{
				return [
					"extent" => strlen($matches[0]),
					"element" => $templateElement
				];
			}
		}
	}
	
	protected function templateHandler($source)
	{
		global $pageindex, $env;
		
		
		$parts = preg_split("/\\||¦/", trim($source, "{}"));
		$parts = array_map("trim", $parts);
		
		// Extract the name of the template page
		$templatePagename = array_shift($parts);
		// If the page that we are supposed to use as the tempalte doesn't
		// exist, then there's no point in continuing.
		if(empty($pageindex->$templatePagename))
			return false;
		
		// Parse the parameters
		$this->maxParamDepth++;
		$params = [];
		$i = 0;
		foreach($parts as $part)
		{
			if(strpos($part, "=") !== false)
			{
				// This param contains an equals sign, so it's a named parameter
				$keyValuePair = explode("=", $part, 2);
				$keyValuePair = array_map("trim", $keyValuePair);
				$params[$keyValuePair[0]] = $keyValuePair[1];
			}
			else
			{
				// This isn't a named parameter
				$params["$i"] = trim($part);
				
				$i++;
			}
		}
		// Add the parsed parameters to the parameter stack
		$this->paramStack[] = [
			"pagename" => $templatePagename,
			"params" => $params
		];
		
		$templateFilePath = $env->storage_prefix . $pageindex->$templatePagename->filename;
		
		$parsedTemplateSource = $this->text(file_get_contents($templateFilePath));
		
		// Remove the parsed parameters from the stack
		array_pop($this->paramStack);
		
		return [
			"name" => "div",
			"text" => $parsedTemplateSource,
			"attributes" => [
				"class" => "template"
			]
		];
	}
	
	/*
	 * ██ ███    ██ ████████ ███████ ██████  ███    ██  █████  ██
	 * ██ ████   ██    ██    ██      ██   ██ ████   ██ ██   ██ ██
	 * ██ ██ ██  ██    ██    █████   ██████  ██ ██  ██ ███████ ██
	 * ██ ██  ██ ██    ██    ██      ██   ██ ██  ██ ██ ██   ██ ██
	 * ██ ██   ████    ██    ███████ ██   ██ ██   ████ ██   ██ ███████
	 * 
	 * ██      ██ ███    ██ ██   ██ ███████
	 * ██      ██ ████   ██ ██  ██  ██
	 * ██      ██ ██ ██  ██ █████   ███████
	 * ██      ██ ██  ██ ██ ██  ██       ██
	 * ███████ ██ ██   ████ ██   ██ ███████
	 */
	protected function inlineInternalLink($fragment)
	{
		global $pageindex, $env;
		
		if(preg_match('/^\[\[([^\]]*)\]\]/', $fragment["text"], $matches))
		{
			$display = $linkPage = trim($matches[1]);
			if(strpos($matches[1], "|") !== false || strpos($matches[1], "¦") !== false)
			{
				// We have a bar character
				$parts = preg_split("/\\||¦/", $matches[1], 2);
				$linkPage = trim($parts[0]); // The page to link to
				$display = trim($parts[1]); // The text to display
			}
			
			$hashCode = "";
			if(strpos($linkPage, "#") !== false)
			{
				// We want to link to a subsection of a page
				$hashCode = substr($linkPage, strpos($linkPage, "#") + 1);
				$linkPage = substr($linkPage, 0, strpos($linkPage, "#"));
				
				// If $linkPage is empty then we want to link to the current page
				if(strlen($linkPage) === 0)
					$linkPage = $env->page;
			}
			
			// If the page doesn't exist, check varying different
			// capitalisations to see if it exists under some variant.
			if(empty($pageindex->$linkPage))
			{
				if(!empty($pageindex->{ucfirst($linkPage)}))
					$linkPage = ucfirst($linkPage);
				else if(!empty($pageindex->{ucwords($linkPage)}))
					$linkPage = ucwords($linkPage);
			}
			
			
			// Construct the full url
			$linkUrl = str_replace(
				"%s", rawurlencode($linkPage),
				$this->internalLinkBase
			);
			
			if(strlen($hashCode) > 0)
				$linkUrl .= "#$hashCode";
			
			$result = [
				"extent" => strlen($matches[0]),
				"element" => [
					"name" => "a",
					"text" => $display,
					"attributes" => [
						"href" => $linkUrl
					]
				]
			];
			
			if(empty($pageindex->$linkPage))
				$result["element"]["attributes"]["class"] = "redlink";
			
			return $result;
		}
		return;
	}
	
	/*
	 * ███████ ██   ██ ████████ ███████ ███    ██ ██████  ███████ ██████
	 * ██       ██ ██     ██    ██      ████   ██ ██   ██ ██      ██   ██
	 * █████     ███      ██    █████   ██ ██  ██ ██   ██ █████   ██   ██
	 * ██       ██ ██     ██    ██      ██  ██ ██ ██   ██ ██      ██   ██
	 * ███████ ██   ██    ██    ███████ ██   ████ ██████  ███████ ██████
	 * 
	 * ██ ███    ███  █████   ██████  ███████ ███████
	 * ██ ████  ████ ██   ██ ██       ██      ██
	 * ██ ██ ████ ██ ███████ ██   ███ █████   ███████
	 * ██ ██  ██  ██ ██   ██ ██    ██ ██           ██
	 * ██ ██      ██ ██   ██  ██████  ███████ ███████
 	 */
	protected function inlineExtendedImage($fragment)
	{
		global $pageindex;
		
		if(preg_match('/^!\[(.*)\]\(([^|¦)]+)\s*(?:(?:\||¦)([^|¦)]*))?(?:(?:\||¦)([^|¦)]*))?(?:(?:\||¦)([^)]*))?\)/', $fragment["text"], $matches))
		{
			/*
			 * 0 - Everything
			 * 1 - Alt text
			 * 2 - Url
			 * 3 - First param (optional)
			 * 4 - Second param (optional)
			 * 5 - Third param (optional)
			 */
			$altText = $matches[1];
			$imageUrl = trim(str_replace("&amp;", "&", $matches[2])); // Decode & to allow it in preview urls
			$param1 = empty($matches[3]) ? false : strtolower(trim($matches[3]));
			$param2 = empty($matches[4]) ? false : strtolower(trim($matches[4]));
			$param3 = empty($matches[5]) ? false : strtolower(trim($matches[5]));
			$floatDirection = false;
			$imageSize = false;
			$imageCaption = false;
			$shortImageUrl = false;
			
			if($this->isFloatValue($param1))
			{
				// Param 1 is a valid css float: ... value
				$floatDirection = $param1;
				$imageSize = $this->parseSizeSpec($param2);
			}
			else if($this->isFloatValue($param2))
			{
				// Param 2 is a valid css float: ... value
				$floatDirection = $param2;
				$imageSize = $this->parseSizeSpec($param1);
			}
			else if($this->isFloatValue($param3))
			{
				$floatDirection = $param3;
				$imageSize = $this->parseSizeSpec($param1);
			}
			else if($param1 === false and $param2 === false)
			{
				// Neither params were specified
				$floatDirection = false;
				$imageSize = false;
			}
			else
			{
				// Neither of them are floats, but at least one is specified
				// This must mean that the first param is a size spec like
				// 250x128.
				$imageSize = $this->parseSizeSpec($param1);
			}
			
			if($param1 !== false && strtolower(trim($param1)) == "caption")
				$imageCaption = true;
				if($param2 !== false && strtolower(trim($param2)) == "caption")
					$imageCaption = true;
			if($param3 !== false && strtolower(trim($param3)) == "caption")
				$imageCaption = true;
			
			//echo("Image url: $imageUrl, Pageindex entry: " . var_export(isset($pageindex->$imageUrl), true) . "\n");
			
			if(isset($pageindex->$imageUrl) and $pageindex->$imageUrl->uploadedfile)
			{
				// We have a short url! Expand it.
				$shortImageUrl = $imageUrl;
				$imageUrl = "index.php?action=preview&size=" . max($imageSize["x"], $imageSize["y"]) ."&page=" . rawurlencode($imageUrl);
			}
			
			$style = "";
			if($imageSize !== false)
				$style .= " max-width: " . $imageSize["x"] . "px; max-height: " . $imageSize["y"] . "px;";
			if($floatDirection)
				$style .= " float: $floatDirection;";
			
			$urlExtension = pathinfo($imageUrl, PATHINFO_EXTENSION);
			$urlType = system_extension_mime_type($urlExtension);
			$result = [];
			switch(substr($urlType, 0, strpos($urlType, "/")))
			{
				case "audio":
					$result = [
						"extent" => strlen($matches[0]),
						"element" => [
							"name" => "audio",
							"text" => $altText,
							"attributes" => [
								"src" => $imageUrl,
								"controls" => "controls",
								"preload" => "metadata",
								"style" => trim($style)
							]
						]
					];
					break;
				case "video":
					$result = [
						"extent" => strlen($matches[0]),
						"element" => [
							"name" => "video",
							"text" => $altText,
							"attributes" => [
								"src" => $imageUrl,
								"controls" => "controls",
								"preload" => "metadata",
								"style" => trim($style)
							]
						]
					];
					break;
				case "image":
				default:
					// If we can't work out what it is, then assume it's an image
					$result = [
						"extent" => strlen($matches[0]),
						"element" => [
							"name" => "img",
							"attributes" => [
								"src" => $imageUrl,
								"alt" => $altText,
								"title" => $altText,
								"style" => trim($style)
							]
						]
					];
					break;
			}
			
			// ~ Image linker ~
			
			$imageHref = $shortImageUrl !== false ? "?page=" . rawurlencode($shortImageUrl) : $imageUrl;
			$result["element"] = [
				"name" => "a",
				"attributes" => [
					"href" => $imageHref
				],
				"text" => [$result["element"]],
				"handler" => "elements"
			];
			
			// ~
			
			if($imageCaption)
			{
				$rawStyle = $result["element"]["attributes"]["style"];
				$containerStyle = preg_replace('/^.*float/', "float", $rawStyle);
				$mediaStyle = preg_replace('/\s*float.*;/', "", $rawStyle);
				$result["element"] = [
					"name" => "figure",
					"attributes" => [
						"style" => $containerStyle
					],
					"text" => [
						$result["element"],
						[
							"name" => "figcaption",
							"text" => $altText
						],
					],
					"handler" => "elements"
				];
				$result["element"]["text"][0]["attributes"]["style"] = $mediaStyle;
			}
			return $result;
		}
	}
	
	# ~
	# Utility Methods
	# ~
	
	private function isFloatValue($value)
	{
		return in_array(strtolower($value), [ "left", "right" ]);
	}
	
	private function parseSizeSpec($text)
	{
		if(strpos($text, "x") === false)
			return false;
		$parts = explode("x", $text, 2);
		
		if(count($parts) != 2)
			return false;
		
		array_map("trim", $parts);
		array_map("intval", $parts);
		
		if(in_array(0, $parts))
			return false;
		
		return [
			"x" => $parts[0],
			"y" => $parts[1]
		];
	}
	
	protected function escapeText($text)
	{
		return htmlentities($text, ENT_COMPAT | ENT_HTML5);
	}
	
	/**
	 * Sets the base url to be used for internal links. '%s' will be replaced
	 * with a URL encoded version of the page name.
	 * @param string $url The url to use when parsing internal links.
	 */
	public function setInternalLinkBase($url)
	{
		$this->internalLinkBase = $url;
	}
}



// %next_module% //

//////////////////////////////////////////////////////////////////

// Execute each module's code
foreach($modules as $moduledata)
{
	$moduledata["code"]();
}
// Make sure that the credits page exists
if(!isset($actions->credits))
{
	exit(page_renderer::render_main("Error - $settings->$sitename", "<p>No credits page detected. The credits page is a required module!</p>"));
}

// Perform the appropriate action
$action_name = $env->action;
if(isset($actions->$action_name))
{
	$req_action_data = $actions->$action_name;
	$req_action_data();
}
else
{
	exit(page_renderer::render_main("Error - $settings->sitename", "<p>No action called " . strtolower($_GET["action"]) ." has been registered. Perhaps you are missing a module?</p>"));
}

?>