User:GoldenRing/wordcount.js

// This function shamelessly copied from https://stackoverflow.com/a/11348383/274460
$.fn.ignore = function(sel) {
  return this.clone().find(sel||">*").remove().end();
};

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('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>'));
 });
}

$(document).ready(function() {
    $('#p-cactions').children('ul.menu').append($('<li><a id="ca-wordcount" title="Add word counts to each section [alt-shift-c]" accesskey="c">Word Count</a></li>'));
    $('#ca-wordcount').click(function() {
	countWords('h1');
	countWords('h2');
	countWords('h3');
    });
});