zeroinstall/gtkui/xdgutils.py

   1 """Adding icons and menu items using the freedesktop.org system.
   2 (xdg = X Desktop Group)
   3 """
   4 # Copyright (C) 2009, Thomas Leonard
   5 # See the README file for details, or visit http://0install.net.
   6
   7 from zeroinstall import _
   8 import shutil, os, tempfile
   9 from logging import info, warn
  10
  11 from zeroinstall import SafeException
  12 from zeroinstall.support import basedir
  13 from zeroinstall.injector import namespaces
  14
  15 _template = """[Desktop Entry]
  16 # This file was generated by zero2desktop.
  17 # See the Zero Install project for details: http://0install.net
  18 Type=Application
  19 Version=1.0
  20 Name=%s
  21 Comment=%s
  22 Exec=0launch -- %s %%f
  23 Categories=Application;%s
  24 """
  25
  26 _icon_template = """Icon=%s
  27 """
  28
  29 def add_to_menu(iface, icon_path, category):
  30         """Write a .desktop file for this application.
  31         @param iface: the program being added
  32         @param icon_path: the path of the icon, or None
  33         @param category: the freedesktop.org menu category"""
  34         tmpdir = tempfile.mkdtemp(prefix = 'zero2desktop-')
  35         try:
  36                 desktop_name = os.path.join(tmpdir, 'zeroinstall-%s.desktop' % iface.get_name().lower().replace(' ', ''))
  37                 desktop = file(desktop_name, 'w')
  38                 desktop.write(_template % (iface.get_name(), iface.summary, iface.uri, category))
  39                 if icon_path:
  40                         desktop.write(_icon_template % icon_path)
  41                 if len(iface.get_metadata(namespaces.XMLNS_IFACE, 'needs-terminal')):
  42                         desktop.write('Terminal=true\n')
  43                 desktop.close()
  44                 status = os.spawnlp(os.P_WAIT, 'xdg-desktop-menu', 'xdg-desktop-menu', 'install', desktop_name)
  45         finally:
  46                 shutil.rmtree(tmpdir)
  47
  48         if status:
  49                 raise SafeException(_('Failed to run xdg-desktop-menu (error code %d)') % status)
  50
  51 def discover_existing_apps():
  52         """Search through the configured XDG datadirs looking for .desktop files created by L{add_to_menu}.
  53         @return: a map from application URIs to .desktop filenames"""
  54         already_installed = {}
  55         for d in basedir.load_data_paths('applications'):
  56                 for desktop_file in os.listdir(d):
  57                         if desktop_file.startswith('zeroinstall-') and desktop_file.endswith('.desktop'):
  58                                 full = os.path.join(d, desktop_file)
  59                                 try:
  60                                         for line in file(full):
  61                                                 line = line.strip()
  62                                                 if line.startswith('Exec=0launch '):
  63                                                         bits = line.split(' -- ', 1)
  64                                                         if ' ' in bits[0]:
  65                                                                 uri = bits[0].split(' ', 1)[1]          # 0launch URI -- %u
  66                                                         else:
  67                                                                 uri = bits[1].split(' ', 1)[0].strip()  # 0launch -- URI %u
  68                                                         already_installed[uri] = full
  69                                                         break
  70                                         else:
  71                                                 info(_("Failed to find Exec line in %s"), full)
  72                                 except Exception, ex:
  73                                         warn(_("Failed to load .desktop file %(filename)s: %(exceptions"), {'filename': full, 'exception': ex})
  74         return already_installed