InstallDocFormatter.php

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<?php
class InstallDocFormatter {
    static function format( $text ) {
        $obj = new self( $text );
 
        return $obj->execute();
    }
 
    protected function __construct( $text ) {
        $this->text = $text;
    }
 
    protected function execute() {
        $text = $this->text;
        // Use Unix line endings, escape some wikitext stuff
        $text = str_replace( [ '<', '{{', '[[', '__', "\r" ],
            [ '&lt;', '&#123;&#123;', '&#91;&#91;', '&#95;&#95;', '' ], $text );
        // join word-wrapped lines into one
        do {
            $prev = $text;
            $text = preg_replace( "/\n([\\*#\t])([^\n]*?)\n([^\n#\\*:]+)/", "\n\\1\\2 \\3", $text );
        } while ( $text != $prev );
        // Replace tab indents with colons
        $text = preg_replace( '/^\t\t/m', '::', $text );
        $text = preg_replace( '/^\t/m', ':', $text );
 
        $linkStart = '<span class="config-plainlink">[';
        $linkEnd = ' $0]</span>';
 
        // turn (Tnnnn) into links
        $text = preg_replace(
            '/T\d+/',
            "{$linkStart}https://phabricator.wikimedia.org/$0{$linkEnd}",
            $text
        );
 
        // turn (bug nnnn) into links
        $text = preg_replace(
            '/bug (\d+)/',
            "{$linkStart}https://bugzilla.wikimedia.org/$1{$linkEnd}",
            $text
        );
 
        // add links to manual to every global variable mentioned
        $text = preg_replace(
            '/\$wg[a-z0-9_]+/i',
            "{$linkStart}https://www.mediawiki.org/wiki/Manual:$0{$linkEnd}",
            $text
        );
 
        return $text;
    }
}