Add new email_debug_dontsend setting

Changelog.md

@@ -9,6 +9,7 @@ This file holds the changelog for Pepperminty Wiki. This is the master list of t
  - Fixed link loop when logging in for crawlers
  - [security] Bugfix: Don't leak the PHP version in emails when expose_php is turned off
  - Fixed handling of Unicode characters when emailing users - added new `email_subject_utf8` and `email_body_utf8` settings to control the new behaviour
+ - Add new `email_debug_dontsend` setting for debugging emails sent by Pepperminty Wiki
 
 ## Changed
  - Improved the search indexing system performance - again

core/05-functions.php

@@ -730,7 +730,19 @@ function email_user($username, $subject, $body)
 	foreach($headers as $header => $value)
 		$compiled_headers .= "$header: $value\r\n";
 	
-	return mail($settings->users->{$username}->emailAddress, $subject, $body, $compiled_headers, "-t");
+	if($settings->email_debug_dontsend) {
+		error_log("[email] Username: $username ({$settings->users->{$username}->emailAddress})
+Subject: $subject
+----- Headers -----
+$compiled_headers
+-------------------
+----- Body -----
+$body
+----------------");
+		return true;
+	}
+	else
+		return mail($settings->users->{$username}->emailAddress, $subject, $body, $compiled_headers, "-t");
 }
 /**
  * Sends a plain text email to a list of users, replacing {username} with each user's name.

peppermint.guiconfig.json

@@ -228,6 +228,7 @@
 	"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" },
+	"email_debug_dontsend": { "type": "checkbox", "description": "If set to true, emails are logged to the standard error instead of being actually sent.", "default": false },
 	"email_subject_utf8": { "type": "checkbox", "description": "Whether to encode the subject of emails sent to allow them to contain unicode characters. Without this, email subjects will be transliterated to ASCII. If utf-8 email subjects are disabled, page names may not be represented properly.", "default": true },
 	"email_body_utf8": { "type": "checkbox", "description": "Whether to send emails with utf-8 bodies. If set to false, email bodies will be transliterated to ASCII. If utf-8 email bodies are disabled, page names may not be represented properly.", "default": true },
 	"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" },