ref: b24ed2bfac81798221977ffed8980d2b4eeab199
dir: /sys/src/cmd/hg/hgext/bookmarks.py/
# Mercurial extension to provide the 'hg bookmark' command
#
# Copyright 2008 David Soria Parra <[email protected]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2, incorporated herein by reference.
'''track a line of development with movable markers
Bookmarks are local movable markers to changesets. Every bookmark
points to a changeset identified by its hash. If you commit a
changeset that is based on a changeset that has a bookmark on it, the
bookmark shifts to the new changeset.
It is possible to use bookmark names in every revision lookup (e.g. hg
merge, hg update).
By default, when several bookmarks point to the same changeset, they
will all move forward together. It is possible to obtain a more
git-like experience by adding the following configuration option to
your .hgrc::
[bookmarks]
track.current = True
This will cause Mercurial to track the bookmark that you are currently
using, and only update it. This is similar to git's approach to
branching.
'''
from mercurial.i18n import _
from mercurial.node import nullid, nullrev, hex, short
from mercurial import util, commands, localrepo, repair, extensions
import os
def parse(repo):
'''Parse .hg/bookmarks file and return a dictionary
Bookmarks are stored as {HASH}\\s{NAME}\\n (localtags format) values
in the .hg/bookmarks file. They are read by the parse() method and
returned as a dictionary with name => hash values.
The parsed dictionary is cached until a write() operation is done.
'''
try:
if repo._bookmarks:
return repo._bookmarks
repo._bookmarks = {}
for line in repo.opener('bookmarks'):
sha, refspec = line.strip().split(' ', 1)
repo._bookmarks[refspec] = repo.lookup(sha)
except:
pass
return repo._bookmarks
def write(repo, refs):
'''Write bookmarks
Write the given bookmark => hash dictionary to the .hg/bookmarks file
in a format equal to those of localtags.
We also store a backup of the previous state in undo.bookmarks that
can be copied back on rollback.
'''
if os.path.exists(repo.join('bookmarks')):
util.copyfile(repo.join('bookmarks'), repo.join('undo.bookmarks'))
if current(repo) not in refs:
setcurrent(repo, None)
wlock = repo.wlock()
try:
file = repo.opener('bookmarks', 'w', atomictemp=True)
for refspec, node in refs.iteritems():
file.write("%s %s\n" % (hex(node), refspec))
file.rename()
finally:
wlock.release()
def current(repo):
'''Get the current bookmark
If we use gittishsh branches we have a current bookmark that
we are on. This function returns the name of the bookmark. It
is stored in .hg/bookmarks.current
'''
if repo._bookmarkcurrent:
return repo._bookmarkcurrent
mark = None
if os.path.exists(repo.join('bookmarks.current')):
file = repo.opener('bookmarks.current')
# No readline() in posixfile_nt, reading everything is cheap
mark = (file.readlines() or [''])[0]
if mark == '':
mark = None
file.close()
repo._bookmarkcurrent = mark
return mark
def setcurrent(repo, mark):
'''Set the name of the bookmark that we are currently on
Set the name of the bookmark that we are on (hg update <bookmark>).
The name is recorded in .hg/bookmarks.current
'''
if current(repo) == mark:
return
refs = parse(repo)
# do not update if we do update to a rev equal to the current bookmark
if (mark and mark not in refs and
current(repo) and refs[current(repo)] == repo.changectx('.').node()):
return
if mark not in refs:
mark = ''
wlock = repo.wlock()
try:
file = repo.opener('bookmarks.current', 'w', atomictemp=True)
file.write(mark)
file.rename()
finally:
wlock.release()
repo._bookmarkcurrent = mark
def bookmark(ui, repo, mark=None, rev=None, force=False, delete=False, rename=None):
'''track a line of development with movable markers
Bookmarks are pointers to certain commits that move when
committing. Bookmarks are local. They can be renamed, copied and
deleted. It is possible to use bookmark names in 'hg merge' and
'hg update' to merge and update respectively to a given bookmark.
You can use 'hg bookmark NAME' to set a bookmark on the working
directory's parent revision with the given name. If you specify
a revision using -r REV (where REV may be an existing bookmark),
the bookmark is assigned to that revision.
'''
hexfn = ui.debugflag and hex or short
marks = parse(repo)
cur = repo.changectx('.').node()
if rename:
if rename not in marks:
raise util.Abort(_("a bookmark of this name does not exist"))
if mark in marks and not force:
raise util.Abort(_("a bookmark of the same name already exists"))
if mark is None:
raise util.Abort(_("new bookmark name required"))
marks[mark] = marks[rename]
del marks[rename]
if current(repo) == rename:
setcurrent(repo, mark)
write(repo, marks)
return
if delete:
if mark is None:
raise util.Abort(_("bookmark name required"))
if mark not in marks:
raise util.Abort(_("a bookmark of this name does not exist"))
if mark == current(repo):
setcurrent(repo, None)
del marks[mark]
write(repo, marks)
return
if mark != None:
if "\n" in mark:
raise util.Abort(_("bookmark name cannot contain newlines"))
mark = mark.strip()
if mark in marks and not force:
raise util.Abort(_("a bookmark of the same name already exists"))
if ((mark in repo.branchtags() or mark == repo.dirstate.branch())
and not force):
raise util.Abort(
_("a bookmark cannot have the name of an existing branch"))
if rev:
marks[mark] = repo.lookup(rev)
else:
marks[mark] = repo.changectx('.').node()
setcurrent(repo, mark)
write(repo, marks)
return
if mark is None:
if rev:
raise util.Abort(_("bookmark name required"))
if len(marks) == 0:
ui.status("no bookmarks set\n")
else:
for bmark, n in marks.iteritems():
if ui.configbool('bookmarks', 'track.current'):
prefix = (bmark == current(repo) and n == cur) and '*' or ' '
else:
prefix = (n == cur) and '*' or ' '
ui.write(" %s %-25s %d:%s\n" % (
prefix, bmark, repo.changelog.rev(n), hexfn(n)))
return
def _revstostrip(changelog, node):
srev = changelog.rev(node)
tostrip = [srev]
saveheads = []
for r in xrange(srev, len(changelog)):
parents = changelog.parentrevs(r)
if parents[0] in tostrip or parents[1] in tostrip:
tostrip.append(r)
if parents[1] != nullrev:
for p in parents:
if p not in tostrip and p > srev:
saveheads.append(p)
return [r for r in tostrip if r not in saveheads]
def strip(oldstrip, ui, repo, node, backup="all"):
"""Strip bookmarks if revisions are stripped using
the mercurial.strip method. This usually happens during
qpush and qpop"""
revisions = _revstostrip(repo.changelog, node)
marks = parse(repo)
update = []
for mark, n in marks.iteritems():
if repo.changelog.rev(n) in revisions:
update.append(mark)
oldstrip(ui, repo, node, backup)
if len(update) > 0:
for m in update:
marks[m] = repo.changectx('.').node()
write(repo, marks)
def reposetup(ui, repo):
if not isinstance(repo, localrepo.localrepository):
return
# init a bookmark cache as otherwise we would get a infinite reading
# in lookup()
repo._bookmarks = None
repo._bookmarkcurrent = None
class bookmark_repo(repo.__class__):
def rollback(self):
if os.path.exists(self.join('undo.bookmarks')):
util.rename(self.join('undo.bookmarks'), self.join('bookmarks'))
return super(bookmark_repo, self).rollback()
def lookup(self, key):
if self._bookmarks is None:
self._bookmarks = parse(self)
if key in self._bookmarks:
key = self._bookmarks[key]
return super(bookmark_repo, self).lookup(key)
def commitctx(self, ctx, error=False):
"""Add a revision to the repository and
move the bookmark"""
wlock = self.wlock() # do both commit and bookmark with lock held
try:
node = super(bookmark_repo, self).commitctx(ctx, error)
if node is None:
return None
parents = self.changelog.parents(node)
if parents[1] == nullid:
parents = (parents[0],)
marks = parse(self)
update = False
if ui.configbool('bookmarks', 'track.current'):
mark = current(self)
if mark and marks[mark] in parents:
marks[mark] = node
update = True
else:
for mark, n in marks.items():
if n in parents:
marks[mark] = node
update = True
if update:
write(self, marks)
return node
finally:
wlock.release()
def addchangegroup(self, source, srctype, url, emptyok=False):
parents = self.dirstate.parents()
result = super(bookmark_repo, self).addchangegroup(
source, srctype, url, emptyok)
if result > 1:
# We have more heads than before
return result
node = self.changelog.tip()
marks = parse(self)
update = False
if ui.configbool('bookmarks', 'track.current'):
mark = current(self)
if mark and marks[mark] in parents:
marks[mark] = node
update = True
else:
for mark, n in marks.items():
if n in parents:
marks[mark] = node
update = True
if update:
write(self, marks)
return result
def _findtags(self):
"""Merge bookmarks with normal tags"""
(tags, tagtypes) = super(bookmark_repo, self)._findtags()
tags.update(parse(self))
return (tags, tagtypes)
repo.__class__ = bookmark_repo
def uisetup(ui):
extensions.wrapfunction(repair, "strip", strip)
if ui.configbool('bookmarks', 'track.current'):
extensions.wrapcommand(commands.table, 'update', updatecurbookmark)
def updatecurbookmark(orig, ui, repo, *args, **opts):
'''Set the current bookmark
If the user updates to a bookmark we update the .hg/bookmarks.current
file.
'''
res = orig(ui, repo, *args, **opts)
rev = opts['rev']
if not rev and len(args) > 0:
rev = args[0]
setcurrent(repo, rev)
return res
cmdtable = {
"bookmarks":
(bookmark,
[('f', 'force', False, _('force')),
('r', 'rev', '', _('revision')),
('d', 'delete', False, _('delete a given bookmark')),
('m', 'rename', '', _('rename a given bookmark'))],
_('hg bookmarks [-f] [-d] [-m NAME] [-r REV] [NAME]')),
}