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gist: 110472 Download_button fork
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Public Clone URL: git://gist.github.com/110472.git
Embed All Files: show embed
diff_for_gist.user.js #
raw 
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// ==UserScript==
// @name           Diff for gist.github for Opera & Chrome
// @namespace      http://ss-o.net/
// @include        http://gist.github.com/*
// @include        https://gist.github.com/*
// ==/UserScript==
 
(function(){
	var f = function($) {
		var rev = $('#revisions li');
		if(!rev.length || rev.length == 1) return;
		var diffSelect = function(e) {
			var me = e.target;
			var c = $('#revisions li input:checked');
			if(c.length > 2)
				c.each(function(i) { if(c[i] != me) c[i].checked = false; });
			$('#diffExec').attr('disabled', (c.length != 2));
		};
		var diffcontent;
		var files = document.getElementById('files');
		var diffsrc = 'http://gist.github.com/105908.txt';
		var diffscript;
		var diffExec = function() {
			if (!window.Diff && !diffscript) {
				var script = diffscript = document.createElement('script');
				script.type = 'text/javascript';
				script.onload = diffExec;
				script.src  = diffsrc;
				document.body.appendChild(script);
				return;
			}
			if(!diffcontent) {
				diffcontent = $('#files div.file')[0].cloneNode(true);
			}
			var pres = diffcontent.getElementsByTagName('pre');
			pres[0].parentNode.replaceChild(pres[0].cloneNode(false),pres[0]);
			pres[1].parentNode.replaceChild(pres[1].cloneNode(false),pres[1]);
			files.insertBefore(diffcontent,files.firstChild);
			$(diffcontent).hide();
			var selected = $('#revisions').find('input:checkbox:checked');
			var link = selected.map(function() {return this.value.replace(/(https?:\/\/[^\/]+\/)/, '$1raw/')});
			var desc = selected.map(function() { return $(this).parent().text().replace(/\s+/g, ' '); });
			var req = function(url,func){
				var x = new XMLHttpRequest();
				x.onload = func;
				x.open('GET',url,false);
				x.send(null);
				return x;
			};
			var clog1,clog2,flog1,flog2,raw1,raw2;
			var log = function(){
				setTimeout(function(){
					var r1 = clog1.responseText.split(/\n/)[0].split(/\s/)[1];
					var r2 = clog2.responseText.split(/\n/)[0].split(/\s/)[1];
					flog1 = req(link[0].replace(/[^\/]*$/, r1), function(){
						flog2 = req(link[1].replace(/[^\/]*$/, r2),fil);
					});
				},100);
			};
			var fil = function(){
				setTimeout(function(){
					var r1 = flog1.responseText.split(/\n/)[0].split(/\s/)[2];
					var r2 = flog2.responseText.split(/\n/)[0].split(/\s/)[2];
					raw1 = req(link[0].replace(/[^\/]*$/, r1), function(){
						raw2 = req(link[1].replace(/[^\/]*$/, r2),dif);
					});
				},100);
			};
			var dif = function(){
				setTimeout(function(){
					var pre = $(pres[1]);
					var udiff = new UnifiedDiff(raw2.responseText, raw1.responseText, 4).toString();
					udiff = '--- ' + desc[1] + '\n' + '+++ ' + desc[0] + '\n' + pre.text(udiff).html();
					var len = udiff.split(/\n/).length;
					if(len < 5000) {
						udiff = udiff.replace(/^(\+.*)$/mg, '<span class="gd">$1</span>')
							.replace(/^(\-.*)$/mg, '<span class="gi">$1</span>')
							.replace(/^(\@.*)$/mg, '<span class="gu">$1</span>')
							.replace(/^(.*)\n/mg, '<div class="line">$1</div>');
						pres[0].innerHTML = new Array(len-1).join(',').split(',').map(function(a,i){return '<span>'+(1+i)+'</span>'}).join('\n');
					}
					pre.html(udiff);
					$(diffcontent).slideDown('normal');
				},100);
			};
			clog1 = req(link[0],function(){
				clog2 = req(link[1],log);
			});
		};
		$('#revisions').append(
			 $('<input type="button" />')
			 .attr('name', 'diffExec')
			 .attr('id', 'diffExec')
			 .val('Compare')
			 .bind('click', diffExec)
			 .attr('disabled', 'disabled')
		);
		rev.each(function() {
			var r = $(this);
			r.prepend(
				$('<input type="checkbox" />')
				.attr('name', 'diff')
				.val(r.find('.id').attr('href'))
				.bind('click', diffSelect)
			);
		});
	};
	var script = document.createElement('script');
	script.type = 'text/javascript';
	script.textContent = '(' + f.toString() + ')(jQuery);';
	document.body.appendChild(script);
})();