User:Enterprisey/talk-tab-count.js

$( function() {    if( !document.getElementById( "ca-talk" ) ) return;    // Insert count early    var talkTabLink = document.getElementById( "ca-talk" ).childNodes[0].childNodes[0];    talkTabLink.textContent += " (?)";    // Determine the name of this page's associated talk page.    // (If we're already on one, then talkPageName is set to wgPageName.)    // The " | 1" part is to set the 1's place to a 1, which guarantees a talk namespace.    var talkPageNamespace = mw.config.get( "wgFormattedNamespaces" )[ mw.config.get( "wgNamespaceNumber" ) | 1 ];    var talkPageName = talkPageNamespace + ":" + mw.config.get( "wgTitle" );    mw.loader.using( [ "mediawiki.api" ] ).then( function () {        // Get the text of the talk page and count the level-2 headers        ( new mw.Api() ).get( {            prop: 'revisions',            rvprop: 'content',            rvlimit: 1,            titles: talkPageName        } ).done( function ( data ) {            if ( !data.query || !data.query.pages ) return;            var pageid = Object.getOwnPropertyNames( data.query.pages )[0],                revisions = data.query.pages[pageid].revisions;            if( revisions === undefined ) {                // The talk page does not exist                talkTabLink.textContent = talkTabLink.textContent.replace( "(?)", "(0)" );            } else {                var text = revisions[0]["*"];                var HEADER_RE = /^\s*==\s*[^=]+?\s*==\s*$/gm;                var headerMatchList = text.match( HEADER_RE );                var headerCount = headerMatchList ? headerMatchList.length : 0;                talkTabLink.textContent = talkTabLink.textContent.replace( "(?)", "(" + headerCount + ")" );            }        } );    } );} );