gistfile1.txt

# This may well be user error, but CoffeeScript:

ubb_text: ubb_text.replace /\[img\](.+?)\[\/img\]/gi, (str, args...) ->
  throw "oh, crap!" unless args[0]
  image_url: if args[0].match(/^http/i) then args[0] else "http://www1.istockphoto.com${args[0]}"
  "<img src=\"${image_url}\" />"

# The resultant js is:

ubb_text = ubb_text.replace(/\[img\](.+?)\[\/img\]/gi, function(str) {
    var args, image_url;
    args = __slice.call(arguments, 1, arguments.length - 0);
    if (!(args[0])) {
      throw "oh, crap!";
    }
    image_url = args[0].match(/^http/i) ? args[0] : ("http://www1.istockphoto.com" + (args[0]));
    return image_url;
  });

# Now, by indenting the last line, as:

ubb_text: ubb_text.replace /\[img\](.+?)\[\/img\]/gi, (str, args...) ->
  throw "oh, crap!" unless args[0]
  image_url: if args[0].match(/^http/i) then args[0] else "http://www1.istockphoto.com${args[0]}"
    "<img src=\"${image_url}\" />"

# The javascript generated is as desired:

ubb_text = ubb_text.replace(/\[img\](.+?)\[\/img\]/gi, function(str) {
  var args, image_url;
  args = __slice.call(arguments, 1, arguments.length - 0);
  if (!(args[0])) {
    throw "oh, crap!";
  }
  image_url = args[0].match(/^http/i) ? args[0] : ("http://www1.istockphoto.com" + (args[0]));
  return "<img src=\"" + (image_url) + "\" />";
});

# This might be user error, but I'm not seeing why an extra level of indentation in necessary here.