run.js

var Pediff = require('./pediff'), pediff = new Pediff(), args = pediff.cli.args;
/* Make sure the script is invoked correctly */
if (args.length === 0){
    pediff.echo('No task provided!', 'ERROR');
    pediff.echo('Usage: casperjs run.js taskname', 'INFO');
    pediff.exit(1);
}
/* Run pediff rendering suit */
pediff.init(require('./tasks/' + args.pop()));
pediff.start().each(Object.keys(pediff.config.environments), function(pd, environment){

    /* Iterate through all defined viewport sizes */
    var viewports = pd.config.options.viewportSize;
    pd.each(viewports, function(self, viewport){

        self.then(function(){ this.setViewportSize(viewport); });
        self.then(function(){ this.setEnvironment(environment); });
        self.then(function(){
            this.viewport(viewport.width, viewport.height, function(){
                this.thenOpen(this.config.environments[environment] + (this.config.path || ''), function() {
                    this.preExecute();
                    this.execute();
                });
                this.then(function(){
                    this.postExecute();
                })
            });
        });
    });
});
pediff.run();