roxshell/support.py

   1 """
   2 @copyright: (C) 2008, Thomas Leonard
   3 @see: U{http://roscidus.com}
   4 """
   5
   6 import gobject
   7 from logging import debug
   8 import os
   9 from zeroinstall.support import tasks           # tmp
  10
  11 def wait_for_blocker(blocker):
  12         """Run a recursive mainloop until blocker is triggered.
  13         @param blocker: event to wait on
  14         @type blocker: L{tasks.Blocker}"""
  15         if not blocker.happened:
  16                 loop = gobject.MainLoop(gobject.main_context_default())
  17                 def quitter():
  18                         yield blocker
  19                         loop.quit()
  20                 quit = tasks.Task(quitter(), "quitter")
  21
  22                 debug("Entering mainloop, waiting for %s", blocker)
  23                 loop.run()
  24
  25                 assert blocker.happened, "Someone quit the main loop!"
  26
  27         tasks.check(blocker)
  28
  29 def find_in_path(cmd):
  30         if os.path.isabs(cmd):
  31                 return cmd
  32         for x in os.environ['PATH'].split(':'):
  33                 full = os.path.join(x, cmd)
  34                 if os.path.exists(full):
  35                         return full
  36         return None
  37
  38 def split_expanded_path(value):
  39         """Like os.path.split(os.path.expanduser(value))"""
  40         if value.startswith('~'):
  41                 value = os.path.expanduser(value)
  42                 if value.startswith('~') and '/' not in value:
  43                         value = os.path.join(os.path.dirname(os.path.expanduser('~')), value[1:])
  44         return os.path.split(value)