mdw@git.distorted.org.uk Git - stgit/blob - stgit/commands/uncommit.py

   1 # -*- coding: utf-8 -*-
   2
   3 __copyright__ = """
   4 Copyright (C) 2006, Karl Hasselström <kha@treskal.com>
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License version 2 as
   8 published by the Free Software Foundation.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU General Public License for more details.
  14
  15 You should have received a copy of the GNU General Public License
  16 along with this program; if not, write to the Free Software
  17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18 """
  19
  20 import sys, os
  21 from optparse import OptionParser, make_option
  22
  23 from stgit.commands.common import *
  24 from stgit.utils import *
  25 from stgit.out import *
  26 from stgit import stack, git
  27
  28 help = 'turn regular GIT commits into StGIT patches'
  29 usage = """%prog [<patchnames>] | -n NUM [<prefix>]] | -t <committish>
  30
  31 Take one or more git commits at the base of the current stack and turn
  32 them into StGIT patches. The new patches are created as applied patches
  33 at the bottom of the stack. This is the exact opposite of 'stg commit'.
  34
  35 By default, the number of patches to uncommit is determined by the
  36 number of patch names provided on the command line. First name is used
  37 for the first patch to uncommit, i.e. for the newest patch.
  38
  39 The -n/--number option specifies the number of patches to uncommit. In
  40 this case, at most one patch name may be specified. It is used as
  41 prefix to which the patch number is appended. If no patch names are
  42 provided on the command line, StGIT automatically generates them based
  43 on the first line of the patch description.
  44
  45 The -t/--to option specifies that all commits up to and including the
  46 given commit should be uncommitted.
  47
  48 Only commits with exactly one parent can be uncommitted; in other
  49 words, you can't uncommit a merge."""
  50
  51 directory = DirectoryGotoToplevel()
  52 options = [make_option('-n', '--number', type = 'int',
  53                        help = 'uncommit the specified number of commits'),
  54            make_option('-t', '--to',
  55                        help = 'uncommit to the specified commit'),
  56            make_option('-x', '--exclusive',
  57                        help = 'exclude the commit specified by the --to option',
  58                        action = 'store_true')]
  59
  60 def func(parser, options, args):
  61     """Uncommit a number of patches.
  62     """
  63     if options.to:
  64         if options.number:
  65             parser.error('cannot give both --to and --number')
  66         if len(args) != 0:
  67             parser.error('cannot specify patch name with --to')
  68         patch_nr = patchnames = None
  69         to_commit = git_id(crt_series, options.to)
  70     elif options.number:
  71         if options.number <= 0:
  72             parser.error('invalid value passed to --number')
  73
  74         patch_nr = options.number
  75
  76         if len(args) == 0:
  77             patchnames = None
  78         elif len(args) == 1:
  79             # prefix specified
  80             patchnames = ['%s%d' % (args[0], i)
  81                           for i in xrange(patch_nr, 0, -1)]
  82         else:
  83             parser.error('when using --number, specify at most one patch name')
  84     elif len(args) == 0:
  85         patchnames = None
  86         patch_nr = 1
  87     else:
  88         patchnames = args
  89         patch_nr = len(patchnames)
  90
  91     if crt_series.get_protected():
  92         raise CmdException, \
  93               'This branch is protected. Uncommit is not permitted'
  94
  95     def get_commit(commit_id):
  96         commit = git.Commit(commit_id)
  97         try:
  98             parent, = commit.get_parents()
  99         except ValueError:
 100             raise CmdException('Commit %s does not have exactly one parent'
 101                                % commit_id)
 102         return (commit, commit_id, parent)
 103
 104     commits = []
 105     next_commit = crt_series.get_base()
 106     if patch_nr:
 107         out.start('Uncommitting %d patches' % patch_nr)
 108         for i in xrange(patch_nr):
 109             commit, commit_id, parent = get_commit(next_commit)
 110             commits.append((commit, commit_id, parent))
 111             next_commit = parent
 112     else:
 113         if options.exclusive:
 114             out.start('Uncommitting to %s (exclusive)' % to_commit)
 115         else:
 116             out.start('Uncommitting to %s' % to_commit)
 117         while True:
 118             commit, commit_id, parent = get_commit(next_commit)
 119             if commit_id == to_commit:
 120                 if not options.exclusive:
 121                     commits.append((commit, commit_id, parent))
 122                 break
 123             commits.append((commit, commit_id, parent))
 124             next_commit = parent
 125         patch_nr = len(commits)
 126
 127     for (commit, commit_id, parent), patchname in \
 128         zip(commits, patchnames or [None for i in xrange(len(commits))]):
 129         author_name, author_email, author_date = \
 130                      name_email_date(commit.get_author())
 131         crt_series.new_patch(patchname,
 132                              can_edit = False, before_existing = True,
 133                              commit = False,
 134                              top = commit_id, bottom = parent,
 135                              message = commit.get_log(),
 136                              author_name = author_name,
 137                              author_email = author_email,
 138                              author_date = author_date)
 139
 140     out.done()