~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

from bzrlib.commands import Command

class ExternalCommand(Command):

    """Class to wrap external commands.

    We cheat a little here, when get_cmd_class() calls us we actually

    give it back an object we construct that has the appropriate path,

    help, options etc for the specified command.

    When run_bzr() tries to instantiate that 'class' it gets caught by

    the __call__ method, which we override to call the Command.__init__

    method. That then calls our run method which is pretty straight

    forward.

    The only wrinkle is that we have to map bzr's dictionary of options

    and arguments back into command line options and arguments for the

    script.

    """

    def find_command(cls, cmd):

        import os.path

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

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

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

            if os.path.isfile(path):

                return ExternalCommand(path)

        return None

    find_command = classmethod(find_command)

    def __init__(self, path):

        self.path = path

        pipe = os.popen('%s --bzr-usage' % path, 'r')

        self.takes_options = pipe.readline().split()

        for opt in self.takes_options:

            if not opt in OPTIONS:

                raise BzrError("Unknown option '%s' returned by external command %s"

                               % (opt, path))

        # TODO: Is there any way to check takes_args is valid here?

        self.takes_args = pipe.readline().split()

        if pipe.close() is not None:

            raise BzrError("Failed funning '%s --bzr-usage'" % path)

        pipe = os.popen('%s --bzr-help' % path, 'r')

        self.__doc__ = pipe.read()

        if pipe.close() is not None:

            raise BzrError("Failed funning '%s --bzr-help'" % path)

    def __call__(self, options, arguments):

        Command.__init__(self, options, arguments)

        return self

    def name(self):

        raise NotImplementedError()

    def run(self, **kargs):

        raise NotImplementedError()

        opts = []

        args = []

        keys = kargs.keys()

        keys.sort()

        for name in keys:

            optname = name.replace('_','-')

            value = kargs[name]

            if OPTIONS.has_key(optname):

                # it's an option

                opts.append('--%s' % optname)

                if value is not None and value is not True:

                    opts.append(str(value))

            else:

                # it's an arg, or arg list

                if type(value) is not list:

                    value = [value]

                for v in value:

                    if v is not None:

                        args.append(str(v))

        self.status = os.spawnv(os.P_WAIT, self.path, [self.path] + opts + args)

        return self.status