fix(linky): make urls starting with www. links, like markdown

It's super cool!

Closes #10290

src/ngSanitize/filter/linky.js

@@ -104,7 +104,7 @@
  */
 angular.module('ngSanitize').filter('linky', ['$sanitize', function($sanitize) {
   var LINKY_URL_REGEXP =
-        /((ftp|https?):\/\/|(mailto:)?[A-Za-z0-9._%+-]+@)\S*[^\s.;,(){}<>"”’]/,
+        /((ftp|https?):\/\/|(www\.)|(mailto:)?[A-Za-z0-9._%+-]+@)\S*[^\s.;,(){}<>"”’]/,
       MAILTO_REGEXP = /^mailto:/;
 
   return function(text, target) {
@@ -117,8 +117,10 @@ angular.module('ngSanitize').filter('linky', ['$sanitize', function($sanitize) {
     while ((match = raw.match(LINKY_URL_REGEXP))) {
       // We can not end in these as they are sometimes found at the end of the sentence
       url = match[0];
-      // if we did not match ftp/http/mailto then assume mailto
-      if (match[2] == match[3]) url = 'mailto:' + url;
+      // if we did not match ftp/http/www/mailto then assume mailto
+      if (!match[2] && !match[4]) {
+        url = (match[3] ? 'http://' : 'mailto:') + url;
+      }
       i = match.index;
       addText(raw.substr(0, i));
       addLink(url, match[0].replace(MAILTO_REGEXP, ''));

test/ngSanitize/filter/linkySpec.js

@@ -20,6 +20,10 @@ describe('linky', function() {
     expect(linky(undefined)).not.toBeDefined();
   });
 
+  it('should handle www.', function() {
+    expect(linky('www.example.com')).toEqual('<a href="http://www.example.com">www.example.com</a>');
+  });
+
   it('should handle mailto:', function() {
     expect(linky("mailto:me@example.com")).
                     toEqual('<a href="mailto:me@example.com">me@example.com</a>');