import os

import re

from subprocess import Popen, PIPE

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

    if path is None:

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

    if isinstance(path, basestring):

        path = [path]

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

    if pathext is None:

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

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

    for ext in pathext:

        if cmd.endswith(ext):

            pathext = ['']

            break

    # check if we find the command on PATH

    for p in path:

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

        if os.path.isfile(f):

            return f

        for ext in pathext:

            fext = f + ext

            if os.path.isfile(fext):

                return fext

    return None

# checks if it can find xgettext on the PATH and

# imports the extraction tests if yes

xgettext_cmd = find_command('xgettext')

if xgettext_cmd:

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

    output = p.communicate()[0]

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

    if match:

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

        if xversion >= (0, 15):

            from extraction import *

    del p