User:MJL/wordsCounter.js

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// Originally found at User:GoldenRing/wordcount.js
// This function shamelessly copied from https://stackoverflow.com/a/11348383/274460

mw.loader.load('//en.wikipedia.org/w/index.php?title=User:MJL/wordsCounter.css&action=raw&ctype=text/css', 'text/css'); // Import stylesheet

var namespace = mw.config.get( 'wgCanonicalNamespace' );
var node = mw.util.addPortletLink(
    'p-tb',
    '#',
    'Word count',
    'pt-wordcount',
    'Add word counts to each section',
	null,
    '#t-info'
  );
function countWords(h) {
 $(h).each(function(i, match) {
  var elements = $(match).nextUntil(h);
  elements.find(':hidden').addClass('wordcount-ignore');
  elements.find('*').filter(function() { return $(this).css('text-decoration').match(/line-through/); }).addClass('wordcount-ignore');
  elements.find('div#siteSub').addClass('wordcount-ignore');
  elements.find('div#contentSub').addClass('wordcount-ignore');
  elements.find('.reflist-talk').addClass('wordcount-ignore');
  elements.find('div#jump-to-nav').addClass('wordcount-ignore');
  elements = elements.not('.wordcount-ignore');
  var text = elements.ignore('span.localcomments').ignore('.wordcount-ignore').text();
  var search = /(\d{1,2}):(\d{2}), (\d{1,2}) ([A-Z][a-z]+) (\d{4}) \(UTC\)/g;
  text = text.replace(search, '');
  text = text.split(/\s/).filter(function(d) { return d.length > 0; })
                                        .filter(function(d) { return d.match(/[a-zA-Z0-9]/); });
  var count = text.length;
  $(match).append($('<span class="mw-editsection">' + count.toLocaleString() + ' words</span>'));
 });
}
if ( namespace === 'Wikipedia' || namespace === 'Wikipedia_talk' ) { 
$.when( mw.loader.using( ['mediawiki.util'] ), $.ready ).done( function() {
  node;
});
}

$(node).on( 'click', function () {
	countWords('h1');
	countWords('h2');
	countWords('h3');
	countWords('h4');
} );