MediaWiki:Gadget-find-archived-section.js

$.when(mw.loader.using(['mediawiki.util', 'mediawiki.api']), $.ready).then(function() {

	var addsection = document.getElementById('ca-addsection');
	var correctNs = mw.config.get('wgNamespaceNumber') % 2 === 1 || mw.config.get('wgNamespaceNumber') === 4;
	var minerva = mw.config.get('skin') === 'minerva';

	// Show only on discussion pages (pages with "add section" button)
	// On minerva skin (which doesn't use add section button) show on all talk & project space pages
	if (!addsection && (!correctNs || !minerva)) {
		return;
	}

	var sectionName = decodeURIComponent(window.___location.hash.slice(1)).replace(/_/g, ' ');
	if (!sectionName || // no section name in URL
		sectionName.indexOf('/media/') === 0 || // URLs used by MediaViewer
		document.getElementById(sectionName.replace(/ /g, '_')) !== null) { // section exists on page
			return;
	}

	$('#mw-content-text').before(
		$('<div>')
			.text('Looks like the discussion "' + sectionName + '" has been archived. Finding archived discussion...')
			.addClass('archived-section-prompt')
			.css({
				'font-size': '90%',
				'padding': '0 0 10px 20px'
			})
	);

	var prefix = mw.config.get('wgPageName').replace(/_/g, ' ');

	// For admin noticeboards, archive pages titles are unusual
	if (prefix === "Wikipedia:Administrators' noticeboard/Incidents") {
		prefix = "Wikipedia:Administrators' noticeboard/IncidentArchive";
	} else if (prefix === "Wikipedia:Administrators' noticeboard/Edit warring") {
		prefix = "Wikipedia:Administrators' noticeboard/3RRArchive";
	} else if (prefix === "Wikipedia:Administrators' noticeboard") {
		prefix = "Wikipedia:Administrators' noticeboard/Archive";
	}

	new mw.Api({
		ajax: { headers: { 'Api-User-Agent': '[[w:en:User:SD0001/find-archived-section.js]]' } }
	}).get({
		action: 'query',
		list: 'search',
		srsearch: '"' + sectionName + '" prefix:"' + prefix + '"',
		srprop: 'sectiontitle',
		srsort: 'create_timestamp_desc', // list more recent archives first
		srlimit: '20'
	}).then(function(json) {
		if (!json || !json.query || !json.query.search) {
			return;
		}

		var divHtml;
		var results = json.query.search;
		if (results.length === 0) {
			divHtml = 'No search results found for archived discussion "' + mw.html.escape(sectionName) + '"';
		} else {
			divHtml = 'Looks like the discussion "' + mw.html.escape(sectionName) + '" has been archived. ';

			var pageTitle;
			// obtain the the first exact section title match (which would be from the most recent archive)
			// this loop iterates over just one item in the vast majority of cases
			for (var i in results) {
				var result = results[i];
				// sectiontitle in API output has spaces encoded as underscores
				if (result.sectiontitle && result.sectiontitle === sectionName.replace(/ /g, '_')) {
					pageTitle = result.title;
					break;
				}
			}

			var searchLink = mw.util.getUrl('Special:Search', {
				search: '~"' + sectionName + '"', // ~ in the beginning forces a search even if a page of the same name exists
				prefix: prefix,
				sort: 'create_timestamp_desc'
			});

			if (pageTitle) {
				var discussionLink = mw.util.getUrl(pageTitle) + '#' + mw.util.wikiUrlencode(sectionName);
				divHtml += '<b><a href="' + discussionLink + '">Click to see archived discussion</a></b> ';
				divHtml += '<small><a href="' + searchLink + '">(or search in archives)</a></small>. ';

			} else {
				divHtml += '<a href="' + searchLink + '">Click to search in archives</a>. ';
			}
		}

		$('.archived-section-prompt').html(divHtml);

	}).fail(function(err) {
		console.error('[find-archived-section]: ', JSON.stringify(err));
	});

});