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

"""This module adds a menu item to the nautilus right-click menu which allows to compare
   the selected files/folder using Meld (Diff and merge tool) just through the right-clicking"""

#   meld-compare.py version 1.0.1
#   
#   Copyright 2009-2010 Giuseppe Penone <giuspen@gmail.com>
#   
#   This program is free software; you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation; either version 2 of the License, or
#   (at your option) any later version.
#   
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#   
#   You should have received a copy of the GNU General Public License
#   along with this program; if not, write to the Free Software
#   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
#   MA 02110-1301, USA.

import pygtk
pygtk.require('2.0')
import gtk
import nautilus, gconf, urllib, os, sys, subprocess, re

NAUTILUS_MENU_LABEL = 'Meld Compare'
NAUTILUS_MENU_HELP = 'Compare the selected Files/Folders using Meld (Diff and merge tool)'

def error_dialog(message, dialog_title = "Error..."):
   """The extension's error dialog"""
   dialog = gtk.MessageDialog(flags=gtk.DIALOG_MODAL,
                              type=gtk.MESSAGE_ERROR,
                              buttons=gtk.BUTTONS_OK,
                              message_format=message)
   dialog.set_title(dialog_title)
   dialog.run()
   dialog.destroy()

class MeldCompare(nautilus.MenuProvider):
   """Implements the 'Meld Compare' extension to the nautilus right-click menu"""
   
   def __init__(self):
      """Creates a GConfClient (Gnome Configuration Client)"""
      self.client = gconf.client_get_default()
   
   def run(self, menu, element_1, element_2):
      """Runs the Meld Comparison of selected files/folders"""
      try: subprocess.call("meld %s %s &" % (element_1, element_2), shell=True)
      except: error_dialog("Exception Error:\n%s" % sys.exc_info())
   
   def get_file_items(self, window, sel_items):
      """Adds the 'Add To Audacious Playlist' menu item to the Nautilus right-click menu, 
         connects its 'activate' signal to the 'run' method passing the list of selected Audio items"""
      if len(sel_items) != 2: return
      element_1 = urllib.unquote(sel_items[0].get_uri()[7:])
      element_2 = urllib.unquote(sel_items[1].get_uri()[7:])
      if os.path.isfile(element_1):
         if not os.path.isfile(element_2): return
         element_1 = re.escape(element_1)
         filetype = subprocess.Popen("file -i %s" % element_1, shell=True, stdout=subprocess.PIPE).communicate()[0]
         if "text" not in filetype: return
         element_2 = re.escape(element_2)
         filetype = subprocess.Popen("file -i %s" % element_2, shell=True, stdout=subprocess.PIPE).communicate()[0]
         if "text" not in filetype: return
      elif os.path.isdir(element_1):
         if not os.path.isdir(element_2): return
         element_1 = re.escape(element_1)
         element_2 = re.escape(element_2)
      else: return
      item = nautilus.MenuItem('NautilusPython::meld', NAUTILUS_MENU_LABEL, NAUTILUS_MENU_HELP)
      item.set_property('icon', 'meld')
      item.connect('activate', self.run, element_1, element_2)
      return item,