execute shell command on iTerm window from MacVim via rb-appscript

scratch.vim

ruby << ENDRUBY

require 'rubygems'
require 'appscript'
include Appscript

class ITerm
  class << self
    def activate;
      @iterm ||= app('iTerm')
    end

    def write(cmd)
      @iterm.current_terminal.sessions.write(:text => cmd)
    end
  end
end

class MacVim
  class << self
    def activate
      @app ||= app('MacVim')
      @app.windows.first.activate
    end
  end
end
ENDRUBY

fun! ITermWrite(cmd)
ruby << ENDRUBY
cmd = VIM::evaluate('a:cmd')
ITerm.activate
ITerm.write(cmd)
MacVim.activate
ENDRUBY
endfun