Compile preprocessors like Coffeescript / SASS on saving in Komodo Edit

Be able to customise the editor is very convenient.

A normal approach is running a "watcher".
This approach is to call the compiler on saving (check Trigger > After save in Marco properties)
The code can be extends for other usage! : )

Note that Komodo has built-in syntax checking for SASS. I want this be off because it generates ".sass-cache" without giving me result. Check it off in preference window.

If something wrong, the command line output will tell you. That's enough : )
We can further "parse" the output to quick click to show the wrong code.

// Run after file saved
// 
// Install Sass: sudo gem install sass
// Install CoffeeScript: npm install -g coffee-script
komodo.assertMacroVersion(3);
var koDoc = ko.views.manager.currentView.koDoc;
var input = koDoc.file.dirName + '/' + koDoc.file.baseName;
var barename = input.substr(0, input.length - koDoc.file.ext.length);

switch (koDoc.file.ext) {
    case '.sass':
        var output =  barename + '.css';
        ko.run.runEncodedCommand(window, 'sass --no-cache ' + input + ' ' + output);
        break;
    case '.coffee':
        ko.run.runEncodedCommand(window, 'coffee --map --compile ' + input);
        break;
    default:
        break;
}