view mercurial/bookmarks.py @ 15257:a8555f9908d1

mq: cleanup of lookup - handling of None is not relevant

Patch specifications in mq is passed around as a string or None. None is
generally used when no patch has been specified and there thus is nothing to
lookup and the calling code should do something else. One code path did however
pass None all the way to lookup. That case was handled in lookup, but there was
really need for that, it was undocumented, and it used to cause trouble back
when patches was specified as integers.

# Mercurial bookmark support code
#
# Copyright 2008 David Soria Parra <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from mercurial.i18n import _
from mercurial.node import hex
from mercurial import encoding, error, util
import errno, os

def valid(mark):
    for c in (':', '\0', '\n', '\r'):
        if c in mark:
            return False
    return True

def read(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.
    Read the file and return a (name=>nodeid) dictionary
    '''
    bookmarks = {}
    try:
        for line in repo.opener('bookmarks'):
            line = line.strip()
            if not line:
                continue
            if ' ' not in line:
                repo.ui.warn(_('malformed line in .hg/bookmarks: %r\n') % line)
                continue
            sha, refspec = line.split(' ', 1)
            refspec = encoding.tolocal(refspec)
            try:
                bookmarks[refspec] = repo.changelog.lookup(sha)
            except error.RepoLookupError:
                pass
    except IOError, inst:
        if inst.errno != errno.ENOENT:
            raise
    return bookmarks

def readcurrent(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
    '''
    mark = None
    try:
        file = repo.opener('bookmarks.current')
    except IOError, inst:
        if inst.errno != errno.ENOENT:
            raise
        return None
    try:
        # No readline() in posixfile_nt, reading everything is cheap
        mark = encoding.tolocal((file.readlines() or [''])[0])
        if mark == '' or mark not in repo._bookmarks:
            mark = None
    finally:
        file.close()
    return mark

def write(repo):
    '''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.
    '''
    refs = repo._bookmarks

    if repo._bookmarkcurrent not in refs:
        setcurrent(repo, None)
    for mark in refs.keys():
        if not valid(mark):
            raise util.Abort(_("bookmark '%s' contains illegal "
                "character" % mark))

    wlock = repo.wlock()
    try:

        file = repo.opener('bookmarks', 'w', atomictemp=True)
        for refspec, node in refs.iteritems():
            file.write("%s %s\n" % (hex(node), encoding.fromlocal(refspec)))
        file.close()

        # touch 00changelog.i so hgweb reloads bookmarks (no lock needed)
        try:
            os.utime(repo.sjoin('00changelog.i'), None)
        except OSError:
            pass

    finally:
        wlock.release()

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
    '''
    current = repo._bookmarkcurrent
    if current == mark:
        return

    if mark not in repo._bookmarks:
        mark = ''
    if not valid(mark):
        raise util.Abort(_("bookmark '%s' contains illegal "
            "character" % mark))

    wlock = repo.wlock()
    try:
        file = repo.opener('bookmarks.current', 'w', atomictemp=True)
        file.write(encoding.fromlocal(mark))
        file.close()
    finally:
        wlock.release()
    repo._bookmarkcurrent = mark

def updatecurrentbookmark(repo, oldnode, curbranch):
    try:
        update(repo, oldnode, repo.branchtags()[curbranch])
    except KeyError:
        if curbranch == "default": # no default branch!
            update(repo, oldnode, repo.lookup("tip"))
        else:
            raise util.Abort(_("branch %s not found") % curbranch)

def update(repo, parents, node):
    marks = repo._bookmarks
    update = False
    mark = repo._bookmarkcurrent
    if mark and marks[mark] in parents:
        old = repo[marks[mark]]
        new = repo[node]
        if new in old.descendants():
            marks[mark] = new.node()
            update = True
    if update:
        repo._writebookmarks(marks)

def listbookmarks(repo):
    # We may try to list bookmarks on a repo type that does not
    # support it (e.g., statichttprepository).
    marks = getattr(repo, '_bookmarks', {})

    d = {}
    for k, v in marks.iteritems():
        d[k] = hex(v)
    return d

def pushbookmark(repo, key, old, new):
    w = repo.wlock()
    try:
        marks = repo._bookmarks
        if hex(marks.get(key, '')) != old:
            return False
        if new == '':
            del marks[key]
        else:
            if new not in repo:
                return False
            marks[key] = repo[new].node()
        write(repo)
        return True
    finally:
        w.release()

def updatefromremote(ui, repo, remote):
    ui.debug("checking for updated bookmarks\n")
    rb = remote.listkeys('bookmarks')
    changed = False
    for k in rb.keys():
        if k in repo._bookmarks:
            nr, nl = rb[k], repo._bookmarks[k]
            if nr in repo:
                cr = repo[nr]
                cl = repo[nl]
                if cl.rev() >= cr.rev():
                    continue
                if cr in cl.descendants():
                    repo._bookmarks[k] = cr.node()
                    changed = True
                    ui.status(_("updating bookmark %s\n") % k)
                else:
                    ui.warn(_("not updating divergent"
                                   " bookmark %s\n") % k)
    if changed:
        write(repo)

def diff(ui, repo, remote):
    ui.status(_("searching for changed bookmarks\n"))

    lmarks = repo.listkeys('bookmarks')
    rmarks = remote.listkeys('bookmarks')

    diff = sorted(set(rmarks) - set(lmarks))
    for k in diff:
        ui.write("   %-25s %s\n" % (k, rmarks[k][:12]))

    if len(diff) <= 0:
        ui.status(_("no changed bookmarks found\n"))
        return 1
    return 0