#!/usr/bin/python
# Copyright 2012, 2013  Lars Wirzenius
#
# 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 3 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, see <http://www.gnu.org/licenses/>.


import cliapp
import os
import sys

import cachedirlib


class Cachedir(cliapp.Application):

    _tag_name = 'CACHEDIR.TAG'
    _tag = 'Signature: 8a477f597d28d172789f06886806bc55\n'

    def _join(self, dirname):
        return os.path.join(dirname, self._tag_name)

    def cmd_tag(self, args):
        '''Add cache tag to directories.'''

        for dirname in args:
            with open(self._join(dirname), 'w') as f:
                f.write(self._tag)

    def cmd_untag(self, args):
        '''Remove cache tag from directories.'''

        for dirname in args:
            os.remove(self._join(dirname))

    def cmd_iscache(self, args):
        '''Are all named directories tagged?

        There is no output, but exit code is 0 if all named directories
        are tagged as cache directories.

        '''

        errors = False
        for dirname in args:
            if not os.path.exists(self._join(dirname)):
                sys.stderr.write('%s is not a cache directory\n' % dirname)
                errors = True
        if errors:
            sys.exit(1)

    def cmd_find(self, args):
        '''Find cache directories under the given directories.'''

        for startdir in args:
            for dirname, subdirs, filenames in os.walk(startdir):
                if os.path.exists(self._join(dirname)):
                    self.output.write('%s\n' % dirname)


Cachedir(version=cachedirlib.__version__).run()