MediaWiki:Gadget-MultiDiffConsecutive.js

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/**
 * View the next/ previous edit of a revision in MediaWiki multi diffs.
 * Uses the localization provided by MediaWiki, requires mediawiki.util
 * and mediawiki.api to work.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @author Marius Hoch < hoo@online.de >
 */

function show() {
	'use strict';

	var oldRevision, newRevision, nextRevisionText, prevRevisionText;

	/**
	 * Load missing messages needed by this script
	 *
	 * @return {jQuery.promise}
	 */
	function loadMessages( msg ) {
		return new mw.Api().loadMessagesIfMissing( [
			'previousdiff',
			'nextdiff'
		] );
	}

	if ( !$( '.diff-multi' ).length ) {
		// No multi diff
		return;
	}
	oldRevision = mw.util.getParamValue(
		'oldid',
		$( '#mw-diff-otitle1' ).find( 'a' ).eq(0).attr( 'href' )
	);
	newRevision = mw.util.getParamValue(
		'oldid',
		$( '#mw-diff-ntitle1' ).find( 'a' ).eq(0).attr( 'href' )
	);
	if ( !newRevision || !oldRevision ) {
		// Weird
		return;
	}

	if ( $( '#differences-nextlink' ).length ) {
		nextRevisionText = $( '#differences-nextlink' ).text();
		getPrevRevisionText();
	} else {
		loadMessages()
    		.done( function nextDiff () {
        		nextRevisionText = mw.msg( 'nextdiff' );
    		} )
			.done( getPrevRevisionText );
	}

	/**
	 * This function gets the interface text for the next revision and
	 * calls doLink after
	 */
	function getPrevRevisionText() {
		if ( $( '#differences-prevlink' ).length ) {
			prevRevisionText = $( '#differences-prevlink' ).text();
			doLink();
		} else {
			loadMessages()
    			.done( function previousDiff () {
        				prevRevisionText = mw.msg( 'previousdiff' );
    			} )
				.done( doLink );
			}
	}

	/**
	 * Insert the diff links after the interface messages have been loaded
	 */
	function doLink() {
		var nextLink = $( '<a>' )
				.attr( 'href', mw.util.wikiScript( 'index' ) + '?oldid=' + oldRevision + '&diff=next' )
				.text( nextRevisionText ),
			prevLink = $( '<a>' )
				.attr( 'href', mw.util.wikiScript( 'index' ) + '?oldid=' + newRevision + '&diff=prev' )
				.text( prevRevisionText ),
			separator = $( '<span>' )
				.text( ' | ' );

		if ( $( '#differences-prevlink' ).length ) {
			// Only add a separator if we already have a visible link
			$( '#mw-diff-otitle4' )
				.append(
					separator.clone(),
					nextLink
				);
		} else {
			$( '#mw-diff-otitle4' )
				.append(
					nextLink
				);
		}

		if ( $( '#differences-nextlink' ).length ) {
			// Only add a separator if we already have a visible link
			$( '#mw-diff-ntitle4' )
				.find( '#differences-nextlink' )
				.before(
					prevLink,
					separator.clone()
				);
		} else {
			$( '#mw-diff-ntitle4' )
				.append(
					prevLink
				);
		}
	}
}

$( document ).ready( show );