~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2004, 2005 by Canonical Ltd

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

# TODO: Perhaps rather than mapping options and arguments back and

# forth, we should just pass in the whole argv, and allow

# ExternalCommands to handle it differently to internal commands?

import os

import sys

from bzrlib.commands import Command

class ExternalCommand(Command):

    """Class to wrap external commands."""

    @classmethod

    def find_command(cls, cmd):

        import os.path

        bzrpath = os.environ.get('BZRPATH', '')

        for dir in bzrpath.split(os.pathsep):

            ## Empty directories are not real paths

            if not dir:

                continue

            path = os.path.join(dir, cmd)

            if os.path.isfile(path):

                return ExternalCommand(path)

        return None

    def __init__(self, path):

        self.path = path

    def name(self):

        return self.path.split(os.sep)[-1]

    def run(self, *args, **kwargs):

        raise NotImplementedError('should not be called on %r' % self)

    def run_argv(self, argv):

        return os.spawnv(os.P_WAIT, self.path, [self.path] + argv)

    def help(self):

        m = 'external command from %s\n\n' % self.path

        pipe = os.popen('%s --help' % self.path)

        return m + pipe.read()