FirefoxEmacsHandler

#!/usr/bin/env ruby
require 'rubygems'
require 'logger'

class UrlParser
  attr_reader :url, :file, :line, :column
  def initialize(url)
    @url = url
    parse_url
  end

  def to_args
    if line && column
      str = "+#{line}:#{column} #{file}"
    else
      file
    end
  end

  private

  # url = 'emacs://open?url=file:///home/jorge/dev/neris/source/app/controllers/inicio_controller.rb&line=1&column=3'
  def parse_url
    regexp = Regexp.new(/emacs:\/\/open\?url=file:\/\/(.+)&line=([0-9]+)&column=([0-9]+)/)
    if url.match(regexp)
      @file = $1
      @line = $2
      @column = $3
    else
      @file = url
    end
  end
end

class EmacsClient
  DEFAULT_COMMAND = "/usr/local/bin/emacsclient -a /usr/local/bin/emacs"

  attr_reader :command, :arguments

  def initialize(args, command=nil)
    @command = command || DEFAULT_COMMAND
    @arguments = args
  end

  def launch
    exec "#{command} #{arguments}"
  end
end

parser = UrlParser.new(ARGV[0])
emacs = EmacsClient.new(parser.to_args)
emacs.launch