// <nowiki>





(function($) {





/*

 ****************************************

 *** twinklediff.js: Diff module

 ****************************************

 * Mode of invocation:     Tab on non-diff pages ("Last"); tabs on diff pages ("Since", "Since mine", "Current")

 * Active on:              Existing non-special pages

 */



Twinkle.diff = function twinklediff() {

	if (mw.config.get('wgNamespaceNumber') < 0 || !mw.config.get('wgArticleId')) {

		return;

	}

	Twinkle.addPortletLink(mw.util.getUrl(mw.config.get('wgPageName'), {diff: 'cur', oldid: 'prev'}), 'Last', 'tw-lastdiff', 'Show most recent diff');



	// Show additional tabs only on diff pages

	if (mw.config.get('wgDiffNewId')) {

		Twinkle.addPortletLink(function() {

			Twinkle.diff.evaluate(false);

		}, 'Since', 'tw-since', 'Show difference between last diff and the revision made by previous user');

		Twinkle.addPortletLink(function() {

			Twinkle.diff.evaluate(true);

		}, 'Since mine', 'tw-sincemine', 'Show difference between last diff and my last revision');



		Twinkle.addPortletLink(mw.util.getUrl(mw.config.get('wgPageName'), {diff: 'cur', oldid: mw.config.get('wgDiffNewId')}), 'Current', 'tw-curdiff', 'Show difference to current revision');

	}

};



Twinkle.diff.evaluate = function twinklediffEvaluate(me) {



	var user;

	if (me) {

		user = mw.config.get('wgUserName');

	} else {

		var node = document.getElementById('mw-diff-ntitle2');

		if (!node) {

			// nothing to do?

			return;

		}

		user = $(node).find('a').first().text();

	}

	var query = {

		prop: 'revisions',

		action: 'query',

		titles: mw.config.get('wgPageName'),

		rvlimit: 1,

		rvprop:  'ids', 'user' ],

		rvstartid: mw.config.get('wgCurRevisionId') - 1, // i.e. not the current one

		rvuser: user,

		format: 'json'

	};

	Morebits.status.init(document.getElementById('mw-content-text'));

	var wikipedia_api = new Morebits.wiki.api('Grabbing data of initial contributor', query, Twinkle.diff.callbacks.main);

	wikipedia_api.params = { user: user };

	wikipedia_api.post();

};



Twinkle.diff.callbacks = {

	main: function(self) {

		var rev = self.response.query.pages0].revisions;

		var revid = rev && rev0].revid;



		if (!revid) {

			self.statelem.error('no suitable earlier revision found, or ' + self.params.user + ' is the only contributor. Aborting.');

			return;

		}

		window.location = mw.util.getUrl(mw.config.get('wgPageName'), {

			diff: mw.config.get('wgCurRevisionId'),

			oldid: revid

		});

	}

};



Twinkle.addInitCallback(Twinkle.diff, 'diff');

})(jQuery);





// </nowiki>