pycompat.py

   1 # -*- encoding: utf-8 -*-
   2 #
   3 #
   4 # Copyright (C) 2011 Jörg Lehmann <joergl@users.sourceforge.net>
   5 # Copyright (C) 2011 André Wobst <wobsta@users.sourceforge.net>
   6 #
   7 # This file is part of PyX (http://pyx.sourceforge.net/).
   8 #
   9 # PyX is free software; you can redistribute it and/or modify
  10 # it under the terms of the GNU General Public License as published by
  11 # the Free Software Foundation; either version 2 of the License, or
  12 # (at your option) any later version.
  13 #
  14 # PyX is distributed in the hope that it will be useful,
  15 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 # GNU General Public License for more details.
  18 #
  19 # You should have received a copy of the GNU General Public License
  20 # along with PyX; if not, write to the Free Software
  21 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  22
  23 class _marker: pass
  24
  25
  26 class wait_pipe:
  27
  28     def __init__(self, pipe, wait):
  29         self.pipe = pipe
  30         self.wait = wait
  31
  32     def write(self, str):
  33         self.pipe.write(str)
  34
  35     def close(self):
  36         self.pipe.close()
  37         self.wait()
  38
  39
  40 def popen(cmd, mode="r", bufsize=_marker):
  41     try:
  42         import subprocess
  43         if mode[0] not in "rw" or "r" in mode[1:] or "w" in mode[1:]:
  44             raise ValueError("read or write mode expected")
  45         if mode[0] == "r":
  46             kwargs = {"stdout": subprocess.PIPE}
  47         else:
  48             kwargs = {"stdin": subprocess.PIPE}
  49         if bufsize is not _marker:
  50             kwargs["bufsize"] = bufsize
  51         pipes = subprocess.Popen(cmd, shell=True, **kwargs)
  52         if mode[0] == "r":
  53             return pipes.stdout
  54         else:
  55             return wait_pipe(pipes.stdin, pipes.wait)
  56     except ImportError:
  57         import os
  58         if bufsize is _marker:
  59             return os.popen(cmd, mode)
  60         else:
  61             return os.popen(cmd, mode, bufsize)
  62
  63 def popen4(cmd, mode="t", bufsize=_marker):
  64     try:
  65         import subprocess
  66         kwargs = {"stdin": subprocess.PIPE,
  67                   "stdout": subprocess.PIPE,
  68                   "stderr": subprocess.STDOUT}
  69         if bufsize is not _marker:
  70             kwargs["bufsize"] = bufsize
  71         pipes = subprocess.Popen(cmd, shell=True, **kwargs)
  72         return pipes.stdin, pipes.stdout
  73     except ImportError:
  74         import os
  75         if bufsize is _marker:
  76             return os.popen4(cmd, mode)
  77         else:
  78             return os.popen4(cmd, mode, bufsize)
  79
  80 try:
  81     any = any
  82 except NameError:
  83     def any(iterable):
  84         for element in iterable:
  85             if element:
  86                 return True
  87         return False
  88
  89 try:
  90     set = set
  91 except NameError:
  92     # Python 2.3
  93     from sets import Set as set