Pepperminty-Wiki/modules/feature-history.php

<?php
register_module([
	"name" => "Page History",
	"version" => "0.2",
	"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() {
		
		/*
		 * ██   ██ ██ ███████ ████████  ██████  ██████  ██    ██
		 * ██   ██ ██ ██         ██    ██    ██ ██   ██  ██  ██
		 * ███████ ██ ███████    ██    ██    ██ ██████    ████
		 * ██   ██ ██      ██    ██    ██    ██ ██   ██    ██
		 * ██   ██ ██ ███████    ██     ██████  ██   ██    ██
		 */
		add_action("history", function() {
			global $settings, $env, $pageindex;
			
			
			$content = "<h1>History for $env->page</h1>\n";
			if(!empty($pageindex->{$env->page}->history))
			{
				$content .= "\t\t<ul class='page-list'>\n";
				foreach($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);
					
					$content .= "<li>#$revisionData->rid " . render_rchange_editor($revisionData->editor) . " " . render_rchange_timestamp($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(function(&$pageinfo, &$newsource, &$oldsource) {
			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
			file_put_contents($paths->pageindex, json_encode($pageindex, JSON_PRETTY_PRINT));
		});
	}
]);

?>