transferring capture images to the cacoo editor on Google Chrome

chrome-cacoo-local-capture.rb

#! /usr/bin/env ruby
# -*- coding: utf-8 -*-

# Time-stamp: <2011-02-20 21:44:14 sakurai>

# ImageMagick: import, identify
# coreutils: base64 
# chrome: ChromeRepl extension
# ruby: google-chrome-client

# Ref:  blog.8-p.info: Auto reloading for Google Chrome 
# http://blog.8-p.info/2010/16-google-chrome

require 'rubygems'
require 'google/chrome/client'
require 'optparse'
require 'pp'

def print_log_and_error(data)
  if data['error']
    puts data['error']['stack']
  elsif data['log']
    if data['log'].kind_of?(String)
      puts data['log']
    else
      pp data['log']
    end
  end
end

GALLERY_EXTENSION_ID = 'dedppbpeendknnpchklgpdiiiodajgki'

extension_id = GALLERY_EXTENSION_ID
port = 9222
script = nil
import_arguments = []

parser = OptionParser.new

parser.on('--port N', Integer) do |n|
  port = n
end

parser.on('--extension ID') do |s|
  extension_id = s
end

parser.on('--screen') do |v|
  import_arguments << "-window root"
end

parser.parse!(ARGV)


file = '/tmp/_capture-cacoo.png'

`import #{import_arguments.join(" ")} #{file}`

if File.exist?(file) then
  size = `identify -format "%w, %h" #{file}`;
  data = `base64 #{file}`.split(/\n/).join

  script = 
    "chrome.tabs.executeScript(null, {code:'
var head = document.getElementsByTagName(\\\'head\\\')[0];
var prv = document.getElementById(\\\'chrome-local-capture\\\');
if (prv) head.removeChild(prv);
var n = document.createElement(\\\'script\\\');
n.id = \\\'chrome-local-capture\\\';
n.innerHTML = \\\'callPlayerFunction(\"captured\",\"#{data}\",#{size});\\\';
head.appendChild(n);
'}, function() {console.log(arguments);});"

  client = Google::Chrome::Client.new('localhost', port)
  extension = client.extension(extension_id)

  extension.connect do |port|
    extension.post(port, script.gsub(/\n/,""))
    client.read_all_response.each do |header, resp|
      print_log_and_error(resp['data'])
    end
  end

end # if