var system = require('system'); var page = require('webpage').create(); var fs = require('fs'); var casper = require(“casper”).create();

var url = casper.cli.get(0); var view_port_width = casper.cli.get(1); var image_name = casper.cli.get(2); var selector = casper.cli.get(3);

casper.start(url, function() {

this.viewport(view_port_width, 1500).then(function(){
  this.wait(2000, function() {
    this.captureSelector(image_name, selector);
    console.log('Snapping ' + url + ' at width ' + view_port_width);
  });
});

});

casper.run();