#!/usr/bin/python -u
# vim: set fileencoding=utf-8 :
#
# (C) 2010 Guido Guenther <agx@sigxcpu.org>
#    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
#
"""Add a patch from debian/patches and autocreate the commit message from the
patch info

running

    gbp-add-patch debian/patches/0010-bla-fasel

commits debian/patches/0010-bla-fasel with this changelog message:

    New patch 0010-bla-fasel

    <patch summary>
    Closes: <bugs>
    Thanks: <author>
"""

import email
import re
import sys
import os, os.path
import subprocess
import tempfile
from gbp.command_wrappers import (Command,
                                  CommandExecFailed,
                                  GitAdd,
                                  GitCommand)
from gbp.config import (GbpOptionParser, GbpOptionGroup)
from gbp.errors import GbpError
from gbp.git import (GitRepositoryError, GitRepository)

class PatchInfo(object):
        def __init__(self, patch):
            t_body = tempfile.NamedTemporaryFile(prefix='gbp_add_patch_', dir='.git/')
            t_patch = tempfile.NamedTemporaryFile(prefix='gbp_add_patch_', dir='.git/')
            popen = subprocess.Popen(['git', 'mailinfo', t_body.name, t_patch.name],
                                      stdin=subprocess.PIPE,
                                      stdout=subprocess.PIPE)
            self.name = patch
            try:
                f = file(patch)
            except IOError, msg:
                raise GbpError, msg
            out, dummy = popen.communicate(f.read())
            f.close()
            self.header = email.message_from_string(out)
            self.body = t_body.read()
            t_body.close()
            self.patch = t_patch.read()
            t_patch.close()

        def summary(self):
            return self.header['Subject']

        def author_name(self):
            return self.header['Author']

        def author(self):
            return '%(Author)s <%(Email)s>' % self.header


class GitCommit(GitCommand):
    """Wrap git commit to commit staged changes"""
    def __init__(self, verbose=False, **kwargs):
        args = [ ['-q'], [] ][verbose]
        GitCommand.__init__(self, cmd='commit', args=args, **kwargs)

    def __call__(self, msg='', edit=False):
        args = [ [], ['-e'] ][edit]
        args += [ [], ['-m', msg] ][len(msg) > 0]
        self.run_error = "Couldn't %s %s" % (self.cmd, " ".join(self.args + args))
        GitCommand.__call__(self, args)


def build_commit_msg(repo, patch, options):
    bug_r = r'(?:bug)?\#?\s?\d+'
    bts_closes = re.compile(r'(?P<bts>%s):\s+%s' % (options.meta_closes, bug_r), re.I)
    thanks = ''
    closes = ''

    author, dummy = repo.get_author_info()
    if author != patch.author_name():
        thanks = "Thanks: %s" % patch.author_name()

    for line in patch.body.split('\n'):
        if bts_closes.match(line):
            closes += line + '\n'

    patch_name = os.path.basename(patch.name)
    msg="""New patch %s

%s
%s
%s""" % (patch_name, patch.summary(), thanks, closes)
    return msg


def main(argv):
    retval = 0

    parser = GbpOptionParser(command=os.path.basename(argv[0]), prefix='',
                             usage='%prog [options] - add a new patch')
    parser.add_config_file_option(option_name="meta-closes", dest="meta_closes",
                      help="Meta tags for the bts close commands, default is '%(meta-closes)s'")
    parser.add_option("-e", "--edit", action="store_true", dest="edit", default=False,
                      help="edit commit message befor committing")
    parser.add_option("-v", "--verbose", action="store_true", dest="verbose", default=False,
                      help="verbose command execution")

    (options, args) = parser.parse_args(argv)

    if options.verbose:
        Command.verbose = True

    try:
        repo = GitRepository(os.path.curdir)
    except GitRepositoryError:
        print >>sys.stderr, "%s is not a git repository" % (os.path.abspath('.'))
        return 1

    try:
        if len(args) != 2:
            parser.print_help()
            raise GbpError
        else:
            patchfile = args[1]

        patch = PatchInfo(patchfile)

        GitAdd()([patchfile])
        msg = build_commit_msg(repo, patch, options)
        GitCommit()(edit=options.edit, msg=msg)
        # FIXME: handle the series file

    except CommandExecFailed:
        retval = 1
    except GbpError, err:
        if len(err.__str__()):
            print >>sys.stderr, err
        retval = 1

    return retval

if __name__ == '__main__':
    sys.exit(main(sys.argv))

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