1 import os

     2 import re

     3 from subprocess import Popen, PIPE

     4 

     5 def find_command(cmd, path=None, pathext=None):

     6     if path is None:

     7         path = os.environ.get('PATH', []).split(os.pathsep)

     8     if isinstance(path, basestring):

     9         path = [path]

    10     # check if there are funny path extensions for executables, e.g. Windows

    11     if pathext is None:

    12         pathext = os.environ.get('PATHEXT', '.COM;.EXE;.BAT;.CMD').split(os.pathsep)

    13     # don't use extensions if the command ends with one of them

    14     for ext in pathext:

    15         if cmd.endswith(ext):

    16             pathext = ['']

    17             break

    18     # check if we find the command on PATH

    19     for p in path:

    20         f = os.path.join(p, cmd)

    21         if os.path.isfile(f):

    22             return f

    23         for ext in pathext:

    24             fext = f + ext

    25             if os.path.isfile(fext):

    26                 return fext

    27     return None

    28 

    29 # checks if it can find xgettext on the PATH and

    30 # imports the extraction tests if yes

    31 xgettext_cmd = find_command('xgettext')

    32 if xgettext_cmd:

    33     p = Popen('%s --version' % xgettext_cmd, shell=True, stdout=PIPE, stderr=PIPE, close_fds=os.name != 'nt', universal_newlines=True)

    34     output = p.communicate()[0]

    35     match = re.search(r'(?P<major>\d+)\.(?P<minor>\d+)', output)

    36     if match:

    37         xversion = (int(match.group('major')), int(match.group('minor')))

    38         if xversion >= (0, 15):

    39             from extraction import *

    40     del p