push/pop: Allow "-n0" to do nothing

[stgit] / stgit / commands / push.py

__copyright__ = """
Copyright (C) 2005, Catalin Marinas <catalin.marinas@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as
published by the Free Software Foundation.

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 stgit.commands import common
from stgit.lib import transaction
from stgit import argparse
from stgit.argparse import opt

help = 'Push one or more patches onto the stack'
kind = 'stack'
usage = ['[options] [<patch1>] [<patch2>] [<patch3>..<patch4>]']
description = """
Push one or more patches (defaulting to the first unapplied one) onto
the stack. The 'push' operation allows patch reordering by commuting
them with the three-way merge algorithm. If there are conflicts while
pushing a patch, those conflicts are written to the work tree, and the
command halts. Conflicts raised during the push operation have to be
fixed and the 'git add --update' command run (alternatively, you may
undo the conflicting push with 'stg undo').

The command also notifies when the patch becomes empty (fully merged
upstream) or is modified (three-way merged) by the 'push' operation."""

args = [argparse.patch_range(argparse.unapplied_patches)]
options = [
    opt('-a', '--all', action = 'store_true',
        short = 'Push all the unapplied patches'),
    opt('-n', '--number', type = 'int',
        short = 'Push the specified number of patches', long = '''
        Push the specified number of patches.

        With a negative number, push all but that many patches.'''),
    opt('--reverse', action = 'store_true',
        short = 'Push the patches in reverse order'),
    opt('--set-tree', action = 'store_true',
        short = 'Push the patch with the original tree', long = """
        Push the patches, but don't perform a merge. Instead, the
        resulting tree will be identical to the tree that the patch
        previously created.

        This can be useful when splitting a patch by first popping the
        patch and creating a new patch with some of the
        changes. Pushing the original patch with '--set-tree' will
        avoid conflicts and only the remaining changes will be in the
        patch.""")
    ] + argparse.keep_option() + argparse.merged_option()

directory = common.DirectoryHasRepositoryLib()

def func(parser, options, args):
    """Pushes the given patches or the first unapplied onto the stack."""
    stack = directory.repository.current_stack
    iw = stack.repository.default_iw
    clean_iw = (not options.keep and iw) or None
    trans = transaction.StackTransaction(stack, 'pop',
                                         check_clean_iw = clean_iw)

    if options.number == 0:
        # explicitly allow this without any warning/error message
        return

    if not trans.unapplied:
        raise common.CmdException('No patches to push')

    if options.all:
        patches = list(trans.unapplied)
    elif options.number is not None:
        patches = trans.unapplied[:options.number]
    elif not args:
        patches = [trans.unapplied[0]]
    else:
        patches = common.parse_patches(args, trans.unapplied)

    if not patches:
        raise common.CmdException('No patches to push')

    if options.reverse:
        patches.reverse()

    if options.set_tree:
        for pn in patches:
            trans.push_tree(pn)
    else:
        try:
            if options.merged:
                merged = set(trans.check_merged(patches))
            else:
                merged = set()
            for pn in patches:
                trans.push_patch(pn, iw, allow_interactive = True,
                                 already_merged = pn in merged)
        except transaction.TransactionHalted:
            pass
    return trans.run(iw)