translator.rb

#!/usr/bin/env ruby
# Usage: ./translator.rb -t yi あれ、今日日食？

require 'ubygems'
require 'grope'
require 'optparse'

@env = Grope::Env.new
@env.load 'http://translate.google.com/'

def translate words, to, from
  exit if(words.empty? || to.nil?)
  from ||= 'auto'

  @env.xpath('id("old_sl")/option[@value="%s"]' % from)[0].selected = true
  @env.xpath('id("old_tl")/option[@value="%s"]' % to)[0].selected = true

  id('source').value = words
  id('text_form').submit

  @env.wait(1)

  puts id('result_box').textContent
end

def id(id)
  @env.document.getElementById(id)
end

def list_languages
  list = @env.xpath 'id("old_tl")/option[not(@disabled)]'
  list.each do |x|
    puts "#{x.value} : #{x.innerText}"
  end
end

#----------------
to, from = ()
ARGV.options do |opt|
  opt.on('-t LANG', '--to=LANG') {|v| to = v }
  opt.on('-f LANG', '--from=LANG') {|v| from = v }
  opt.on('-l', '--list') {|v| list_languages; exit }
  opt.parse!
end
translate ARGV.join(' '), to, from