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Editing: addon-wikitext.php

<?php

class BP_Docs_Wikitext {

/**
	 * PHP 5 constructor
	 *
	 * @since 1.2
	 */
	public function __construct() {
		add_filter( 'the_content', array( $this, 'bracket_links' ) );
	}

/**
	 * Detects wiki-style bracket linking
	 *
	 * @since 1.2
	 */
	function bracket_links( $content ) {
		// Don't do this on a non-Doc
		if ( ! bp_docs_is_existing_doc() ) {
			return $content;
		}

// Find the text enclosed in double brackets.
		// Letters, numbers, spaces, parentheses, pipes
		$pattern = '|\[\[([a-zA-Z\s0-9\-\|]+?)\]\]|';
		$content = preg_replace_callback( $pattern, array( $this, 'process_bracket_content' ), $content );

return $content;
	}

/**
	 * Callback function for replacing bracketed links with the proper links
	 *
	 * If a page is found, a link to the page is produced. Otherwise a link to the create page
	 * is produced, with the create_title flag.
	 *
	 * @since 1.2
	 *
	 * @param array $match A single match passed from preg_replace_callback()
	 * @return str A formatted link
	 */
	function process_bracket_content( $match ) {
		global $bp, $wpdb;

// Check for a pipe
		if ( $pipe_pos = strpos( $match[1], '|' ) ) {
			// If one is found, then the link text will be different from
			// the page name
			$link_text = substr( $match[1], $pipe_pos + 1 );
			$link_page = substr( $match[1], 0, $pipe_pos );
		} else {
			// If no pipe is found, set the link text and link page the same
			$link_text = $link_page = $match[1];
		}

// Look for a page with this title. WP_Query does not allow this for some reason
		$docs = $wpdb->get_results( $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE post_title = %s AND post_type = %s", $link_page, bp_docs_get_post_type_name() ) );

// If none were found, do the same query with page slugs
		if ( empty( $docs ) ) {
			$docs = $wpdb->get_results( $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE post_name = %s AND post_type = %s", sanitize_title_with_dashes( $link_page ), bp_docs_get_post_type_name() ) );
		}

// Filter the docs. This will be used to exclude docs that do not belong to a group
		$docs = apply_filters( 'bp_docs_bracket_matches', $docs );

if ( !empty( $docs ) ) {
			// If we have a result, create a link to that page
			// There might be more than one result. I guess we take the first one
			$doc 	   = $docs[0];

$permalink = get_permalink( $doc );
			$class 	   = 'existing-doc';
		} else {
			// If no result is found, create a link to the edit page
			$permalink = add_query_arg( 'create_title', urlencode( $link_page ), bp_docs_get_create_link() );
			$class	   = 'nonexistent-doc';
		}

return apply_filters( 'bp_docs_bracket_link', '<a href="' . $permalink . '" class="' . $class . '">' . $link_text . '</a>' );
	}

}