Insync Caja plugin context menu fix

print('loading insync caja plugin..')
import caja
import gtk # gtk2
import json
import os
import socket
import sys
import urllib

DEV_MODE = False

#http://www.gtk.org/tutorial1.2/gtk_tut-13.html
#http://pygtk.org/docs/pygtk/class-gtkaction.html
#gtk.Action(name, label, tooltip, stock_id)

FS_ENCODING = sys.getfilesystemencoding()   # C is 'ANSI_X3.4-1968'

def ipc_insync(**kw):
  data = json.dumps(kw)
  socket_file = u'/tmp/insync%r.sock' % os.getuid()
  if not os.path.exists(socket_file):
    if DEV_MODE:
      print('WARN: insync socket not found')
    return None
  sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
  sock.settimeout(0.1)
  try:
    sock.connect(socket_file)
    sock.send(data)
    res = sock.recv(4096)
    sock.close()
  except:
    return None
  if res.strip():
    return json.loads(res.strip())
  else:
    return None


_EMBLEM_KEYS = {
  'SYNCED': 'emblem-insync-synced',
  'SYNCING': 'emblem-insync-syncing',
  'ERROR': 'emblem-insync-error',
  'DES_ERROR': 'emblem-insync-des-error',
  'DES_SYNCING': 'emblem-insync-syncing',
}


class InsyncPlugin(caja.MenuProvider, caja.InfoProvider):

  # Caja crashes if a plugin doesn't implement the __init__ method.
  # See Bug #374958
  def __init__(self):
    pass

  def get_background_items(self, window, file):
    return None

  def get_file_items(self, window, files):
    if DEV_MODE:
      print('get file items', files)

    if len(files) != 1:
      # TODO what can we do with mutiple files here
      return None

    file = files[0]
    if file.get_uri_scheme() != 'file':
      return None

    path = os.path.realpath(urllib.unquote(file.get_uri()[len('file://'):]))
    path = unicode(path, FS_ENCODING)
    if DEV_MODE:
      print path
    is_dir = os.path.isdir(path)

    cm_info = ipc_insync(command='CONTEXT-MENU-ITEMS', full_path=path)

    if cm_info:
      title, cm_items = cm_info
      tip = 'Insync folder actions' if is_dir else 'Insync file actions'
      item = caja.MenuItem(
        name=title,
        label=title,
        tip=tip,
        icon='insync'
      )
      sub_menu = caja.Menu()
      item.set_submenu(sub_menu)

      sep_id = 0
      for text, cmd in cm_items:
        if text == 'separator':
          text = u'\u2015' * 10
          name = 'separator:' + str(sep_id)
          sep_id += 1
        else:
          name = text
        menu_item = caja.MenuItem(name=name, label=text, tip=text)
        if cmd:
          menu_item.connect('activate', self.do_action, file, cmd)
        else:
          menu_item.sensitive = False
        sub_menu.append_item(menu_item)

      return [item]
    return None

  def do_action(self, menu, file, method):
    path = urllib.unquote(
      file.get_uri()[len('file://'):]
    )
    ipc_insync(method=method, full_path=path)

  def update_file_info(self, file):
    if file.get_uri_scheme() != 'file':
      return

    filename = urllib.unquote(file.get_uri()[len('file://'):])
    filename = os.path.realpath(filename)
    status = ipc_insync(command='GET-FILE-STATUS', full_path=filename)
    if DEV_MODE:
      print filename, status
    if status and status != 'UNKNOWN':
      emblem = _EMBLEM_KEYS[status]
      if os.path.isdir(filename):
        is_shared = ipc_insync(command='IS-FILE-SHARED', full_path=filename)
        if is_shared:
          emblem += '-shared'
      file.add_emblem(emblem)
    file.invalidate_extension_info()