hgext/evolution.py
author Pierre-Yves David <pierre-yves.david@ens-lyon.org>
Wed, 21 Sep 2011 03:49:59 +0200
changeset 94 780a222d547d
parent 92 5b23cdf998d0
child 103 23c232a81fbe
permissions -rw-r--r--
[evolution:evolve] use short hex instead of rev number
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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# states.py - introduce the state concept for mercurial changeset
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#
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# Copyright 2011 Peter Arrenbrecht <peter.arrenbrecht@gmail.com>
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#                Logilab SA        <contact@logilab.fr>
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#                Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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'''A set of command to make changeset evolve.'''
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from mercurial import cmdutil
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from mercurial import scmutil
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from mercurial import node
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from mercurial import error
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from mercurial import extensions
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from mercurial import commands
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from mercurial import bookmarks
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from mercurial import context
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from mercurial import util
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from mercurial.i18n import _
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from mercurial.commands import walkopts, commitopts, commitopts2, logopts
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### util function
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#############################
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def noderange(repo, revsets):
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    """The same as revrange but return node"""
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    return map(repo.changelog.node,
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               scmutil.revrange(repo, revsets))
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### extension check
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#############################
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def extsetup(ui):
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    try:
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        obsolete = extensions.find('obsolete')
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    except KeyError:
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        raise error.Abort(_('evolution extension require obsolete extension.'))
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    try:
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        rebase = extensions.find('rebase')
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    except KeyError:
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        raise error.Abort(_('evolution extension require rebase extension.'))
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### changeset rewriting logic
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#############################
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def rewrite(repo, old, updates, head, newbases, commitopts):
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    if len(old.parents()) > 1: #XXX remove this unecessary limitation.
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        raise error.Abort(_('cannot amend merge changesets'))
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    base = old.p1()
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    bm = bookmarks.readcurrent(repo)
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    wlock = repo.wlock()
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    try:
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        # commit a new version of the old changeset, including the update
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        # collect all files which might be affected
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        files = set(old.files())
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        for u in updates:
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            files.update(u.files())
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        # prune files which were reverted by the updates
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        def samefile(f):
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            if f in head.manifest():
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                a = head.filectx(f)
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                if f in base.manifest():
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                    b = base.filectx(f)
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                    return (a.data() == b.data()
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                            and a.flags() == b.flags()
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                            and a.renamed() == b.renamed())
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                else:
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                    return False
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            else:
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                return f not in base.manifest()
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        files = [f for f in files if not samefile(f)]
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        # commit version of these files as defined by head
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        headmf = head.manifest()
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        def filectxfn(repo, ctx, path):
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            if path in headmf:
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                return head.filectx(path)
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            raise IOError()
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        new = context.memctx(repo,
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                             parents=newbases,
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                             text=commitopts.get('message') or old.description(),
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                             files=files,
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                             filectxfn=filectxfn,
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                             user=commitopts.get('user') or None,
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                             date=commitopts.get('date') or None,
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                             extra=commitopts.get('extra') or None)
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        newid = repo.commitctx(new)
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        new = repo[newid]
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        # update the bookmark
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        if bm:
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            repo._bookmarks[bm] = newid
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            bookmarks.write(repo)
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        # hide obsolete csets
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        repo.changelog.hiddeninit = False
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        # add evolution metadata
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        repo.addobsolete(new.node(), old.node())
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        for u in updates:
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            repo.addobsolete(u.node(), old.node())
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            repo.addobsolete(new.node(), u.node())
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    finally:
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        wlock.release()
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    return newid
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def relocate(repo, rev, dest):
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    """rewrite <rev> on dest"""
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    try:
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        rebase = extensions.find('rebase')
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        # dummy state to trick rebase node
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        assert repo[rev].p2().rev() == node.nullrev, 'no support yet'
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        rebase.updatedirstate(repo, rev, repo[dest].node(),
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                                         repo[rev].p2().node())
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        rebase.rebasenode(repo, rev, dest, {node.nullrev: node.nullrev})
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        nodenew = rebase.concludenode(repo, rev, dest, node.nullid)
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        nodesrc = repo.changelog.node(rev)
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        repo.addobsolete(nodenew, nodesrc)
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        oldbookmarks = repo.nodebookmarks(nodesrc)
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        for book in oldbookmarks:
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            repo._bookmarks[book] = nodenew
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        if oldbookmarks:
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            bookmarks.write(repo)
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    except util.Abort:
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        # Invalidate the previous setparents
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        repo.dirstate.invalidate()
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        raise
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### new command
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#############################
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cmdtable = {}
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command = cmdutil.command(cmdtable)
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@command('^evolve',
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    [],
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    '')
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def evolve(ui, repo):
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    """suggest the next evolution step"""
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    obsolete = extensions.find('obsolete')
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    next = min(obsolete.unstables(repo))
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    obs = repo[next].parents()[0]
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    if not obs.obsolete():
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        obs = next.parents()[1]
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    assert obs.obsolete()
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    newer = obsolete.newerversion(repo, obs.node())
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    target = newer[-1]
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    repo.ui.status('hg relocate --rev %s %s\n' % (repo[next], repo[target]))
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@command('^relocate',
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    [
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    ('r', 'rev', '.',
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     _('revision to relocate')),
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    ],
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    '')
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def cmdrelocate(ui, repo, dest, rev='.'):
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    """relocate a changeset"""
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    wlock = repo.wlock()
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    try:
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        src = scmutil.revsingle(repo, rev, rev)
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        dest = scmutil.revsingle(repo, dest, dest)
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        if src == src.ancestor(dest):
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            raise util.Abort(_('source is ancestor of destination'))
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        relocate(repo, src.rev(), dest.rev())
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        return 0
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    finally:
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        wlock.release()
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@command('^kill',
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    [],
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    '<revs>')
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def kill(ui, repo, *revs):
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    """mark a changeset as obsolete
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    This update the parent directory to a not-killed parent if the current
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    working directory parent are killed.
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    XXX bookmark support
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    XXX handle merge
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    XXX check immutable first
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    """
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    wlock = repo.wlock()
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    try:
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        targetnodes = set(noderange(repo, revs))
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        for n in targetnodes:
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            repo.addobsolete(node.nullid, n)
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        # update to an unkilled parent
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        wdp = repo['.']
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        newnode = wdp
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        while newnode.obsolete():
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            newnode = newnode.parents()[0]
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        if newnode.node() != wdp.node():
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            commands.update(ui, repo, newnode.rev())
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            ui.status(_('working directory now at %s\n') % newnode)
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    finally:
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        wlock.release()
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@command('^amend',
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    [('A', 'addremove', None,
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     _('mark new/missing files as added/removed before committing')),
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    ('n', 'note', '',
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     _('use text as commit message for this update')),
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    ('c', 'change', '',
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     _('specifies the changeset to amend'), _('REV'))
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    ] + walkopts + commitopts + commitopts2,
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    _('[OPTION]... [FILE]...'))
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def amend(ui, repo, *pats, **opts):
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    """combine a changeset with updates and replace it with a new one
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    Commits a new changeset incorporating both the changes to the given files
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    and all the changes from the current parent changeset into the repository.
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    See :hg:`commit` for details about committing changes.
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    If you don't specify -m, the parent's message will be reused.
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    If you specify --change, amend additionally considers all changesets between
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    the indicated changeset and the working copy parent as updates to be subsumed.
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    This allows you to commit updates manually first. As a special shorthand you
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    can say `--amend .` instead of '--amend p1(p1())', which subsumes your latest
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    commit as an update of its parent.
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    Behind the scenes, Mercurial first commits the update as a regular child
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    of the current parent. Then it creates a new commit on the parent's parents
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    with the updated contents. Then it changes the working copy parent to this
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    new combined changeset. Finally, the old changeset and its update are hidden
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    from :hg:`log` (unless you use --hidden with log).
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    Returns 0 on success, 1 if nothing changed.
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    """
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    # determine updates to subsume
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    change = opts.get('change')
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    if change == '.':
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        change = 'p1(p1())'
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    old = scmutil.revsingle(repo, change)
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    wlock = repo.wlock()
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    try:
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        if not old.state().mutable:
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            raise util.Abort(_("can not rewrite immutable changeset %s") % old)
82
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        # commit current changes as update
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        # code copied from commands.commit to avoid noisy messages
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        ciopts = dict(opts)
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        ciopts['message'] = opts.get('note') or ('amends %s' % old.hex())
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        e = cmdutil.commiteditor
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        if ciopts.get('force_editor'):
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            e = cmdutil.commitforceeditor
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        def commitfunc(ui, repo, message, match, opts):
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            return repo.commit(message, opts.get('user'), opts.get('date'), match,
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                               editor=e)
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        cmdutil.commit(ui, repo, commitfunc, pats, ciopts)
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        # find all changesets to be considered updates
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        cl = repo.changelog
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        head = repo['.']
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        updatenodes = set(cl.nodesbetween(roots=[old.node()],
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                                          heads=[head.node()])[0])
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        updatenodes.remove(old.node())
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        if not updatenodes:
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            raise error.Abort(_('no updates found'))
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        updates = [repo[n] for n in updatenodes]
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        # perform amend
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        newid = rewrite(repo, old, updates, head,
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                        [old.p1().node(), old.p2().node()], opts)
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        # reroute the working copy parent to the new changeset
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        repo.dirstate.setparents(newid, node.nullid)
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    finally:
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        wlock.release()