MediaWiki:Gadget-find-archived-section.js

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$.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 have 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>')
			.html('Looks like the discussion "' + sectionName + '" has been archived. Finding archived discussion...')
			.addClass('archived-section-prompt')
			.css({
				'font-size': '90%',
				'padding-left': '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";
	}

	var searchString = '~"' + sectionName + '"';

	var searchLink = mw.config.get('wgScript')
					+ '?title=Special:Search'
					+ '&search=' + encodeURIComponent(searchString)
					+ '&prefix=' + encodeURIComponent(prefix)
					+ '&sort=create_timestamp_desc';

	// Fetch and parse search results page
	$.ajax(searchLink).then(function(html) {
		var divHtml;
		if ($(html).find('.mw-search-nonefound').length) {
			divHtml = 'No search results found for archived discussion "' + sectionName + '"';

		} else {
			divHtml = 'Looks like the discussion "' + sectionName + '" has been archived. ';

			var discussionLink;
			// 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
			$(html).find('ul.mw-search-results .searchalttitle a').each(function() {
				if (this.textContent === sectionName) {
					discussionLink = this.getAttribute('href');
					return false; // break
				}
			});

			if (discussionLink) {

				// escape double quotes in link, so that they aren't treated as end of href
				// encodeURI() doesn't work here as it tends to escape characters such as the single quote which
				// have already been escaped by mediawiki, resulting in a doubly-escaped malformed url
				divHtml += '<b><a href="' + discussionLink.replace(/"/g, '%22') + '">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));
	});

});