module Markup::Preview::Command
  module Util

    def command_exist? (command)
      system "which #{command} >/dev/null 2>&1"
    end

    def browser_command
      return "gnome-open" if command_exist? "gnome-open"
      return "open"       if command_exist? "open"
      return "cygstart"   if command_exist? "cygstart"
      return "kfmclient"  if command_exist? "kfmclient"
      return "exo-open"   if command_exist? "exo-open"
      exit 1
    end

  end
end