new_contents: """
  Nemo Extension
  Adds a "send with NitroShare" menu item to files and directories
  
  The MIT License (MIT)
  
  Copyright (c) 2016 Nathan Osman
  
  Permission is hereby granted, free of charge, to any person obtaining a copy of
  this software and associated documentation files (the "Software"), to deal in
  the Software without restriction, including without limitation the rights to
  use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
  of the Software, and to permit persons to whom the Software is furnished to do
  so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
  """
  
  from json import loads
  from os import path
  from urllib import url2pathname
  from urlparse import urlparse
  
  import gi
  gi.require_version('Gtk', '3.0')
  gi.require_version('Nemo', '3.0')
  
  from gi.repository import Nemo, GObject, Gtk
  from requests import ConnectionError, post
  
  
  class NitroShareMenu(GObject.GObject, Nemo.MenuProvider):
      """
      Add a menu item "Send with NitroShare".
      """
  
      _LOCALFILE = path.join(path.expanduser('~'), '.NitroShare')
  
      def send_items(self, menu, window, files, port, token):
          """
          Attempt to send the files using NitroShare.
          """
          try:
              post(
                  url='http://127.0.0.1:{}/sendItems'.format(port),
                  json={'items': files},
                  headers={'X-Auth-Token': token},
              )
          except ConnectionError as e:
              dialog = Gtk.MessageDialog(
                  window,
                  Gtk.DialogFlags.MODAL,
                  Gtk.MessageType.ERROR,
                  Gtk.ButtonsType.OK,
                  "Unable to communicate with NitroShare.",
              )
              dialog.format_secondary_text(str(e))
              dialog.run()
              dialog.destroy()
  
      def get_file_items(self, window, files):
          """
          Return a menu item if some files were selected.
          """
          if not len(files):
              return
          item = Nemo.MenuItem(
              name='NitroShare::SendFiles',
              label="Send with NitroShare...",
          )
          try:
              with open(self._LOCALFILE, 'r') as f:
                  d = loads(f.read())
              port = d['port']
              token = d['token']
          except (IOError, KeyError):
              item.set_property('sensitive', False)
          else:
              item.connect(
                  'activate',
                  self.send_items,
                  window,
                  [url2pathname(urlparse(x.get_uri()).path) for x in files],
                  port,
                  token,
              )
          return [item]
  
subject: add extension for Nemo (Nautilus fork of Cinnamon)