capture script for phantomjs

capture.js

if (phantom.args.length == 0) {
  phantom.exit();
}

var i = 0, ua, url, clipRect = null, file, wait_ms;
if (!phantom.args[i].match(/^https?:\/\//)) {
  ua = phantom.args[i++];
}
url = phantom.args[i++];
file = phantom.args[i++];
wait_ms = +phantom.args[i++];

if (url.match(/(.+)#(\d+)x(\d+)/)) {
  url = RegExp.$1;
  clipRect = {left: 0, top: 0, width: +RegExp.$2, height: +RegExp.$3};
}
if (url.match(/(.+)#(\d+),(\d+)-(\d+)x(\d+)/)) {
  url = RegExp.$1;
  clipRect = {left: +RegExp.$2, top: +RegExp.$3, width: +RegExp.$4, height: +RegExp.$5};
}

if (!file) {
  file = url.replace(/^https?:\/\//, '').replace(/\/+$/, '').replace(/\//g, '_');
}
if (!file.match(/\.png$/)) {
  file = file + '.png';
}

if (!wait_ms) {
  wait_ms = 1000;
}

var page = require('webpage').create();
if (ua) {
  page.settings.userAgent = ua;
  if (ua.match(/(?:iPhone|Android)/)) {
    page.viewportSize = {width: 320, height: 480};
  }
}
page.open(url, function () {
  window.setTimeout(function () {
    if (clipRect) {
      page.clipRect = clipRect;
    }
    page.render(file);
    console.log('create ' + file);
    phantom.exit();
  }, +wait_ms);
});