gistfile1.txt

Showdown.extensions['twitter'] = function(converter) {
  return [
    // Replace escaped @ symbols
    { type: 'lang', regex: '\\@', replace: 'red' }
  ];
}

Hi Gus,

Fix the indentation, and you'll be able to better spot where the syntax error is.

(function(){

  var twitter = function(converter) {
    return [
      {
        type: 'lang',
        filter: function(text) {
          text.replace(/blue/g, 'red');
        }
      }
    ];


  // Client-side export
  if (typeof window !== 'undefined' && window.Showdown && window.Showdown.extensions) { window.Showdown.extensions.twitter = twitter; }
  // Server-side export
  if (typeof module !== 'undefined') module.exports = twitter;

}());

Now it's pretty easy to see that the closing } is missing on the var twitter function.

The comment about returning text.replace is correct. I've made that correction below.

The last comment is referring to how the server-side export won't work in the browser. The last lines are for detecting that (we copied them from the twitter example), though they could be replaced with one line since we know it'll be running in a browser.

Here's an example with all the changes:

(function(){

  var twitter = function(converter) {
    return [
      {
        type: 'lang',
        filter: function(text) {
          return text.replace(/blue/g, 'red');
        }
      }
    ];
  }

  window.Showdown.extensions.twitter = twitter;
}());