Gazelle/sections/tools/development/render_snap_preview.js

var page = require('webpage').create();
var system = require('system');
var fs = require('fs');
var returnStatus = {};
var rootPath = system.args[1];
var staticPath = system.args[2];

// Check if all paths are accessible
// We assume at least read rights on all paths and files
if (!fs.isDirectory(rootPath) || !fs.isDirectory(rootPath + '/' + staticPath) || !fs.isDirectory(rootPath + '/' + staticPath + 'styles/' + system.args[3] + '/') || !fs.isDirectory(rootPath + '/' + staticPath + '/stylespreview')) {
  //Incorrect paths, are they passed correctly?
  returnStatus.status = -1;
  console.log(JSON.stringify(returnStatus));
  phantom.exit();
}
// Switch to given stylesheet directory
fs.changeWorkingDirectory(rootPath + '/' + staticPath + 'styles/' + system.args[3] + '/');
if (!fs.exists('preview.html')) {
  // Preview file doesn't exist. Running things in the wrong order perhaps?
  returnStatus.status = -2;
  console.log(JSON.stringify(returnStatus));
  phantom.exit();
}
// Open the file, start working.
page.open('preview.html', function () {
  if (page.framePlainText == "") {
    // Preview is empty. Did it get created properly?
    returnStatus.status = -3;
    console.log(JSON.stringify(returnStatus));
    phantom.exit();
  }
  page.viewportSize = {
    width: 1200,
    height: 800
  };
  // Save files to static
  fs.changeWorkingDirectory(rootPath + '/' + staticPath + '/stylespreview');
  if (!fs.isWritable(fs.workingDirectory)) {
    // Don't have write access.
    returnStatus.status = -4;
    console.log(JSON.stringify(returnStatus));
    phantom.exit();
  }
  page.render('full_' + system.args[3] + '.png');
  if (!fs.isFile('full_' + system.args[3] + '.png')) {
    // Failed to store full image.
    returnStatus.status = -5;
    console.log(JSON.stringify(returnStatus));
    phantom.exit();
  }
  // Remove temp files
  fs.changeWorkingDirectory(rootPath + '/' + staticPath + 'styles/' + system.args[3] + '/');
  if (!fs.isFile('preview.html') || !fs.isWritable('preview.html')) {
    // Can't find temp file to remove. Are the paths correct?
    returnStatus.status = -6;
    console.log(JSON.stringify(returnStatus));
    phantom.exit();
  }
  fs.remove('preview.html');
  // All good and done
  page.close();
  returnStatus.status = 0;
  console.log(JSON.stringify(returnStatus));
  phantom.exit();
});