def copybranchcache(fname):
     srcbranchcache = srcrepo.join("cache/%s" % fname)
     dstbranchcache = os.path.join(dstcachedir, fname)
     if os.path.exists(srcbranchcache):
         if not os.path.exists(dstcachedir):
             os.mkdir(dstcachedir)
         util.copyfile(srcbranchcache, dstbranchcache)

def _premerge(repo, toolconf, files, labels=None):
    tool, toolpath, binary, symlink = toolconf
    if symlink:
        return 1
    a, b, c, back = files

    ui = repo.ui

    validkeep = ['keep', 'keep-merge3']

    # do we attempt to simplemerge first?
    try:
        premerge = _toolbool(ui, tool, "premerge", not binary)
    except error.ConfigError:
        premerge = _toolstr(ui, tool, "premerge").lower()
        if premerge not in validkeep:
            _valid = ', '.join(["'" + v + "'" for v in validkeep])
            raise error.ConfigError(_("%s.premerge not valid "
                                      "('%s' is neither boolean nor %s)") %
                                    (tool, premerge, _valid))

    if premerge:
        if premerge == 'keep-merge3':
            if not labels:
                labels = _defaultconflictlabels
            if len(labels) < 3:
                labels.append('base')
        r = simplemerge.simplemerge(ui, a, b, c, quiet=True, label=labels)
        if not r:
            ui.debug(" premerge successful\n")
            return 0
        if premerge not in validkeep:
            util.copyfile(back, a) # restore from backup and try again
    return 1 # continue merging

    def addbackup(self, file, hardlink=True, location=''):
        """Adds a backup of the file to the transaction

        Calling addbackup() creates a hardlink backup of the specified file
        that is used to recover the file in the event of the transaction
        aborting.

        * `file`: the file path, relative to .hg/store
        * `hardlink`: use a hardlink to quickly create the backup
        """
        if self._queue:
            msg = 'cannot use transaction.addbackup inside "group"'
            raise RuntimeError(msg)

        if file in self.map or file in self._backupmap:
            return
        vfs = self._vfsmap[location]
        dirname, filename = vfs.split(file)
        backupfilename = "%s.backup.%s" % (self.journal, filename)
        backupfile = vfs.reljoin(dirname, backupfilename)
        if vfs.exists(file):
            filepath = vfs.join(file)
            backuppath = vfs.join(backupfile)
            util.copyfile(filepath, backuppath, hardlink=hardlink)
        else:
            backupfile = ''

        self._addbackupentry((location, file, backupfile, False))

def _premerge(repo, toolconf, files):
    tool, toolpath, binary, symlink = toolconf
    if symlink:
        return 1
    a, b, c, back = files

    ui = repo.ui

    # do we attempt to simplemerge first?
    try:
        premerge = _toolbool(ui, tool, "premerge", not binary)
    except error.ConfigError:
        premerge = _toolstr(ui, tool, "premerge").lower()
        valid = 'keep'.split()
        if premerge not in valid:
            _valid = ', '.join(["'" + v + "'" for v in valid])
            raise error.ConfigError(_("%s.premerge not valid "
                                      "('%s' is neither boolean nor %s)") %
                                    (tool, premerge, _valid))

    if premerge:
        r = simplemerge.simplemerge(ui, a, b, c, quiet=True)
        if not r:
            ui.debug(" premerge successful\n")
            return 0
        if premerge != 'keep':
            util.copyfile(back, a) # restore from backup and try again
    return 1 # continue merging

def _playback(journal, report, opener, vfsmap, entries, backupentries,
              unlink=True):
    for f, o, _ignore in entries:
        if o or not unlink:
            try:
                fp = opener(f, 'a')
                fp.truncate(o)
                fp.close()
            except IOError:
                report(_("failed to truncate %s\n") % f)
                raise
        else:
            try:
                opener.unlink(f)
            except (IOError, OSError) as inst:
                if inst.errno != errno.ENOENT:
                    raise

    backupfiles = []
    for l, f, b, c in backupentries:
        if l not in vfsmap and c:
            report("couldn't handle %s: unknown cache location %s\n"
                        % (b, l))
        vfs = vfsmap[l]
        try:
            if f and b:
                filepath = vfs.join(f)
                backuppath = vfs.join(b)
                try:
                    util.copyfile(backuppath, filepath)
                    backupfiles.append(b)
                except IOError:
                    report(_("failed to recover %s\n") % f)
            else:
                target = f or b
                try:
                    vfs.unlink(target)
                except (IOError, OSError) as inst:
                    if inst.errno != errno.ENOENT:
                        raise
        except (IOError, OSError, util.Abort) as inst:
            if not c:
                raise

    opener.unlink(journal)
    backuppath = "%s.backupfiles" % journal
    if opener.exists(backuppath):
        opener.unlink(backuppath)
    try:
        for f in backupfiles:
            if opener.exists(f):
                opener.unlink(f)
    except (IOError, OSError, util.Abort) as inst:
        # only pure backup file remains, it is sage to ignore any error
        pass

def copyfile(src, dst, basedir):
    abssrc, absdst = [util.canonpath(basedir, basedir, x) for x in [src, dst]]
    if os.path.exists(absdst):
        raise util.Abort(_("cannot create %s: destination already exists") % dst)

    dstdir = os.path.dirname(absdst)
    if dstdir and not os.path.isdir(dstdir):
        try:
            os.makedirs(dstdir)
        except IOError:
            raise util.Abort(_("cannot create %s: unable to create destination directory") % dst)

    util.copyfile(abssrc, absdst)

    def copyfile(abssrc, relsrc, otarget, exact):
        abstarget = scmutil.canonpath(repo.root, cwd, otarget)
        reltarget = repo.pathto(abstarget, cwd)
        target = repo.wjoin(abstarget)
        src = repo.wjoin(abssrc)
        state = repo.dirstate[abstarget]

        scmutil.checkportable(ui, abstarget)

        # check for collisions
        prevsrc = targets.get(abstarget)
        if prevsrc is not None:
            ui.warn(_('%s: not overwriting - %s collides with %s\n') %
                    (reltarget, repo.pathto(abssrc, cwd),
                     repo.pathto(prevsrc, cwd)))
            return

        # check for overwrites
        exists = os.path.lexists(target)
        if not after and exists or after and state in 'mn':
            if not opts['force']:
                ui.warn(_('%s: not overwriting - file exists\n') %
                        reltarget)
                return

        if after:
            if not exists:
                if rename:
                    ui.warn(_('%s: not recording move - %s does not exist\n') %
                            (relsrc, reltarget))
                else:
                    ui.warn(_('%s: not recording copy - %s does not exist\n') %
                            (relsrc, reltarget))
                return
        elif not dryrun:
            try:
                if exists:
                    os.unlink(target)
                targetdir = os.path.dirname(target) or '.'
                if not os.path.isdir(targetdir):
                    os.makedirs(targetdir)
                util.copyfile(src, target)
                srcexists = True
            except IOError, inst:
                if inst.errno == errno.ENOENT:
                    ui.warn(_('%s: deleted in working copy\n') % relsrc)
                    srcexists = False
                else:
                    ui.warn(_('%s: cannot copy - %s\n') %
                            (relsrc, inst.strerror))
                    return True # report a failure

def copyfile(src, dst, basedir=None):
    if not basedir:
        basedir = os.getcwd()

    abssrc, absdst = [os.path.join(basedir, n) for n in (src, dst)]
    if os.path.exists(absdst):
        raise util.Abort(_("cannot create %s: destination already exists") %
                         dst)

    targetdir = os.path.dirname(absdst)
    if not os.path.isdir(targetdir):
        os.makedirs(targetdir)

    util.copyfile(abssrc, absdst)

def _idump(repo, mynode, orig, fcd, fco, fca, toolconf, files, labels=None):
    """
    Creates three versions of the files to merge, containing the
    contents of local, other and base. These files can then be used to
    perform a merge manually. If the file to be merged is named
    ``a.txt``, these files will accordingly be named ``a.txt.local``,
    ``a.txt.other`` and ``a.txt.base`` and they will be placed in the
    same directory as ``a.txt``."""
    r = _premerge(repo, toolconf, files, labels=labels)
    if r:
        a, b, c, back = files

        fd = fcd.path()

        util.copyfile(a, a + ".local")
        repo.wwrite(fd + ".other", fco.data(), fco.flags())
        repo.wwrite(fd + ".base", fca.data(), fca.flags())
    return False, r

def run():
    print("Creating search")
    util.makedirs("../search")
    util.copyfile("database/countries.csv", "../search/countries.csv")
    util.copyfile("database/estudiantes.csv", "../search/estudiantes.csv")
    util.copyfile("templates/search/search.js", "../search/search.js")
    util.copyfile("templates/search/asciify.js", "../search/asciify.js")
    html = templates.get("search/index")
    html = templates.initial_replace(html, 3)
    html = templates.final_replace(html, "..")
    util.writefile("../search/index.html", html)

 def _writeundo(self):
     """write transaction data for possible future undo call"""
     if self.undoname is None:
         return
     undobackupfile = self.opener.open("%s.backupfiles" % self.undoname, 'w')
     undobackupfile.write('%d\n' % version)
     for l, f, b, c in self._backupentries:
         if not f:  # temporary file
             continue
         if not b:
             u = ''
         else:
             if l not in self._vfsmap and c:
                 self.report("couldn't remote %s: unknown cache location"
                             "%s\n" % (b, l))
                 continue
             vfs = self._vfsmap[l]
             base, name = vfs.split(b)
             assert name.startswith(self.journal), name
             uname = name.replace(self.journal, self.undoname, 1)
             u = vfs.reljoin(base, uname)
             util.copyfile(vfs.join(b), vfs.join(u), hardlink=True)
         undobackupfile.write("%s\0%s\0%s\0%d\n" % (l, f, u, c))
     undobackupfile.close()

def filemerge(repo, mynode, orig, fcd, fco, fca):
    """perform a 3-way merge in the working directory

    mynode = parent node before merge
    orig = original local filename before merge
    fco = other file context
    fca = ancestor file context
    fcd = local file context for current/destination file
    """

    def temp(prefix, ctx):
        pre = "%s~%s." % (os.path.basename(ctx.path()), prefix)
        (fd, name) = tempfile.mkstemp(prefix=pre)
        data = repo.wwritedata(ctx.path(), ctx.data())
        f = os.fdopen(fd, "wb")
        f.write(data)
        f.close()
        return name

    if not fco.cmp(fcd):  # files identical?
        return None

    ui = repo.ui
    fd = fcd.path()
    binary = fcd.isbinary() or fco.isbinary() or fca.isbinary()
    symlink = "l" in fcd.flags() + fco.flags()
    tool, toolpath = _picktool(repo, ui, fd, binary, symlink)
    ui.debug("picked tool '%s' for %s (binary %s symlink %s)\n" % (tool, fd, binary, symlink))

    if not tool or tool == "internal:prompt":
        tool = "internal:local"
        if ui.promptchoice(
            _(" no tool found to merge %s\n" "keep (l)ocal or take (o)ther?") % fd, (_("&Local"), _("&Other")), 0
        ):
            tool = "internal:other"
    if tool == "internal:local":
        return 0
    if tool == "internal:other":
        repo.wwrite(fd, fco.data(), fco.flags())
        return 0
    if tool == "internal:fail":
        return 1

    # do the actual merge
    a = repo.wjoin(fd)
    b = temp("base", fca)
    c = temp("other", fco)
    out = ""
    back = a + ".orig"
    util.copyfile(a, back)

    if orig != fco.path():
        ui.status(_("merging %s and %s to %s\n") % (orig, fco.path(), fd))
    else:
        ui.status(_("merging %s\n") % fd)

    ui.debug("my %s other %s ancestor %s\n" % (fcd, fco, fca))

    # do we attempt to simplemerge first?
    try:
        premerge = _toolbool(ui, tool, "premerge", not (binary or symlink))
    except error.ConfigError:
        premerge = _toolstr(ui, tool, "premerge").lower()
        valid = "keep".split()
        if premerge not in valid:
            _valid = ", ".join(["'" + v + "'" for v in valid])
            raise error.ConfigError(
                _("%s.premerge not valid " "('%s' is neither boolean nor %s)") % (tool, premerge, _valid)
            )

    if premerge:
        r = simplemerge.simplemerge(ui, a, b, c, quiet=True)
        if not r:
            ui.debug(" premerge successful\n")
            os.unlink(back)
            os.unlink(b)
            os.unlink(c)
            return 0
        if premerge != "keep":
            util.copyfile(back, a)  # restore from backup and try again

    env = dict(
        HG_FILE=fd,
        HG_MY_NODE=short(mynode),
        HG_OTHER_NODE=str(fco.changectx()),
        HG_BASE_NODE=str(fca.changectx()),
        HG_MY_ISLINK="l" in fcd.flags(),
        HG_OTHER_ISLINK="l" in fco.flags(),
        HG_BASE_ISLINK="l" in fca.flags(),
    )

    if tool == "internal:merge":
        r = simplemerge.simplemerge(ui, a, b, c, label=["local", "other"])
    elif tool == "internal:dump":
        a = repo.wjoin(fd)
        util.copyfile(a, a + ".local")
        repo.wwrite(fd + ".other", fco.data(), fco.flags())
        repo.wwrite(fd + ".base", fca.data(), fca.flags())
        os.unlink(b)
        os.unlink(c)
#.........这里部分代码省略.........

#.........这里部分代码省略.........
    stream: stream raw data uncompressed from repository (fast over
    LAN, slow over WAN)

    rev: revision to clone up to (implies pull=True)

    update: update working directory after clone completes, if
    destination is local repository (True means update to default rev,
    anything else is treated as a revision)

    branch: branches to clone
    """

    if isinstance(source, str):
        origsource = ui.expandpath(source)
        source, branch = parseurl(origsource, branch)
        srcpeer = peer(ui, peeropts, source)
    else:
        srcpeer = source.peer() # in case we were called with a localrepo
        branch = (None, branch or [])
        origsource = source = srcpeer.url()
    rev, checkout = addbranchrevs(srcpeer, srcpeer, branch, rev)

    if dest is None:
        dest = defaultdest(source)
        ui.status(_("destination directory: %s\n") % dest)
    else:
        dest = ui.expandpath(dest)

    dest = util.urllocalpath(dest)
    source = util.urllocalpath(source)

    if not dest:
        raise util.Abort(_("empty destination path is not valid"))
    if os.path.exists(dest):
        if not os.path.isdir(dest):
            raise util.Abort(_("destination '%s' already exists") % dest)
        elif os.listdir(dest):
            raise util.Abort(_("destination '%s' is not empty") % dest)

    srclock = destlock = cleandir = None
    srcrepo = srcpeer.local()
    try:
        abspath = origsource
        if islocal(origsource):
            abspath = os.path.abspath(util.urllocalpath(origsource))

        if islocal(dest):
            cleandir = dest

        copy = False
        if (srcrepo and srcrepo.cancopy() and islocal(dest)
            and not phases.hassecret(srcrepo)):
            copy = not pull and not rev

        if copy:
            try:
                # we use a lock here because if we race with commit, we
                # can end up with extra data in the cloned revlogs that's
                # not pointed to by changesets, thus causing verify to
                # fail
                srclock = srcrepo.lock(wait=False)
            except error.LockError:
                copy = False

        if copy:
            srcrepo.hook('preoutgoing', throw=True, source='clone')
            hgdir = os.path.realpath(os.path.join(dest, ".hg"))
            if not os.path.exists(dest):
                os.mkdir(dest)
            else:
                # only clean up directories we create ourselves
                cleandir = hgdir
            try:
                destpath = hgdir
                util.makedir(destpath, notindexed=True)
            except OSError, inst:
                if inst.errno == errno.EEXIST:
                    cleandir = None
                    raise util.Abort(_("destination '%s' already exists")
                                     % dest)
                raise

            destlock = copystore(ui, srcrepo, destpath)

            # Recomputing branch cache might be slow on big repos,
            # so just copy it
            dstcachedir = os.path.join(destpath, 'cache')
            srcbranchcache = srcrepo.sjoin('cache/branchheads')
            dstbranchcache = os.path.join(dstcachedir, 'branchheads')
            if os.path.exists(srcbranchcache):
                if not os.path.exists(dstcachedir):
                    os.mkdir(dstcachedir)
                util.copyfile(srcbranchcache, dstbranchcache)

            # we need to re-init the repo after manually copying the data
            # into it
            destpeer = peer(srcrepo, peeropts, dest)
            srcrepo.hook('outgoing', source='clone',
                          node=node.hex(node.nullid))
        else:

#.........这里部分代码省略.........

        if copy:
            try:
                # we use a lock here because if we race with commit, we
                # can end up with extra data in the cloned revlogs that's
                # not pointed to by changesets, thus causing verify to
                # fail
                srclock = srcrepo.lock(wait=False)
            except error.LockError:
                copy = False

        if copy:
            srcrepo.hook("preoutgoing", throw=True, source="clone")
            hgdir = os.path.realpath(os.path.join(dest, ".hg"))
            if not os.path.exists(dest):
                os.mkdir(dest)
            else:
                # only clean up directories we create ourselves
                cleandir = hgdir
            try:
                destpath = hgdir
                util.makedir(destpath, notindexed=True)
            except OSError as inst:
                if inst.errno == errno.EEXIST:
                    cleandir = None
                    raise util.Abort(_("destination '%s' already exists") % dest)
                raise

            destlock = copystore(ui, srcrepo, destpath)
            # copy bookmarks over
            srcbookmarks = srcrepo.join("bookmarks")
            dstbookmarks = os.path.join(destpath, "bookmarks")
            if os.path.exists(srcbookmarks):
                util.copyfile(srcbookmarks, dstbookmarks)

            # Recomputing branch cache might be slow on big repos,
            # so just copy it
            def copybranchcache(fname):
                srcbranchcache = srcrepo.join("cache/%s" % fname)
                dstbranchcache = os.path.join(dstcachedir, fname)
                if os.path.exists(srcbranchcache):
                    if not os.path.exists(dstcachedir):
                        os.mkdir(dstcachedir)
                    util.copyfile(srcbranchcache, dstbranchcache)

            dstcachedir = os.path.join(destpath, "cache")
            # In local clones we're copying all nodes, not just served
            # ones. Therefore copy all branch caches over.
            copybranchcache("branch2")
            for cachename in repoview.filtertable:
                copybranchcache("branch2-%s" % cachename)

            # we need to re-init the repo after manually copying the data
            # into it
            destpeer = peer(srcrepo, peeropts, dest)
            srcrepo.hook("outgoing", source="clone", node=node.hex(node.nullid))
        else:
            try:
                destpeer = peer(srcrepo or ui, peeropts, dest, create=True)
                # only pass ui when no srcrepo
            except OSError as inst:
                if inst.errno == errno.EEXIST:
                    cleandir = None
                    raise util.Abort(_("destination '%s' already exists") % dest)
                raise

def filemerge(repo, fw, fd, fo, wctx, mctx):
    """perform a 3-way merge in the working directory

    fw = original filename in the working directory
    fd = destination filename in the working directory
    fo = filename in other parent
    wctx, mctx = working and merge changecontexts
    """

    def temp(prefix, ctx):
        pre = "%s~%s." % (os.path.basename(ctx.path()), prefix)
        (fd, name) = tempfile.mkstemp(prefix=pre)
        data = repo.wwritedata(ctx.path(), ctx.data())
        f = os.fdopen(fd, "wb")
        f.write(data)
        f.close()
        return name

    def isbin(ctx):
        try:
            return util.binary(ctx.data())
        except IOError:
            return False

    fco = mctx.filectx(fo)
    if not fco.cmp(wctx.filectx(fd).data()): # files identical?
        return None

    ui = repo.ui
    fcm = wctx.filectx(fw)
    fca = fcm.ancestor(fco) or repo.filectx(fw, fileid=nullrev)
    binary = isbin(fcm) or isbin(fco) or isbin(fca)
    symlink = fcm.islink() or fco.islink()
    tool, toolpath = _picktool(repo, ui, fw, binary, symlink)
    ui.debug(_("picked tool '%s' for %s (binary %s symlink %s)\n") %
               (tool, fw, binary, symlink))

    if not tool:
        tool = "internal:local"
        if ui.prompt(_(" no tool found to merge %s\n"
                       "keep (l)ocal or take (o)ther?") % fw,
                     _("[lo]"), _("l")) != _("l"):
            tool = "internal:other"
    if tool == "internal:local":
        return 0
    if tool == "internal:other":
        repo.wwrite(fd, fco.data(), fco.fileflags())
        return 0
    if tool == "internal:fail":
        return 1

    # do the actual merge
    a = repo.wjoin(fd)
    b = temp("base", fca)
    c = temp("other", fco)
    out = ""
    back = a + ".orig"
    util.copyfile(a, back)

    if fw != fo:
        repo.ui.status(_("merging %s and %s\n") % (fw, fo))
    else:
        repo.ui.status(_("merging %s\n") % fw)
    repo.ui.debug(_("my %s other %s ancestor %s\n") % (fcm, fco, fca))

    # do we attempt to simplemerge first?
    if _toolbool(ui, tool, "premerge", not (binary or symlink)):
        r = simplemerge.simplemerge(a, b, c, quiet=True)
        if not r:
            ui.debug(_(" premerge successful\n"))
            os.unlink(back)
            os.unlink(b)
            os.unlink(c)
            return 0
        util.copyfile(back, a) # restore from backup and try again

    env = dict(HG_FILE=fd,
               HG_MY_NODE=str(wctx.parents()[0]),
               HG_OTHER_NODE=str(mctx),
               HG_MY_ISLINK=fcm.islink(),
               HG_OTHER_ISLINK=fco.islink(),
               HG_BASE_ISLINK=fca.islink())

    if tool == "internal:merge":
        r = simplemerge.simplemerge(a, b, c, label=['local', 'other'])
    else:
        args = _toolstr(ui, tool, "args", '$local $base $other')
        if "$output" in args:
            out, a = a, back # read input from backup, write to original
        replace = dict(local=a, base=b, other=c, output=out)
        args = re.sub("\$(local|base|other|output)",
                      lambda x: '"%s"' % replace[x.group()[1:]], args)
        r = util.system(toolpath + ' ' + args, cwd=repo.root, environ=env)

    if not r and _toolbool(ui, tool, "checkconflicts"):
        if re.match("^(<<<<<<< .*|=======|>>>>>>> .*)$", fcm.data()):
            r = 1

    if not r and _toolbool(ui, tool, "checkchanged"):
        if filecmp.cmp(repo.wjoin(fd), back):
#.........这里部分代码省略.........

def filemerge(repo, mynode, orig, fcd, fco, fca, labels=None):
    """perform a 3-way merge in the working directory

    mynode = parent node before merge
    orig = original local filename before merge
    fco = other file context
    fca = ancestor file context
    fcd = local file context for current/destination file
    """

    def temp(prefix, ctx):
        pre = "%s~%s." % (os.path.basename(ctx.path()), prefix)
        (fd, name) = tempfile.mkstemp(prefix=pre)
        data = repo.wwritedata(ctx.path(), ctx.data())
        f = os.fdopen(fd, "wb")
        f.write(data)
        f.close()
        return name

    if not fco.cmp(fcd): # files identical?
        return None

    ui = repo.ui
    fd = fcd.path()
    binary = fcd.isbinary() or fco.isbinary() or fca.isbinary()
    symlink = 'l' in fcd.flags() + fco.flags()
    tool, toolpath = _picktool(repo, ui, fd, binary, symlink)
    ui.debug("picked tool '%s' for %s (binary %s symlink %s)\n" %
               (tool, fd, binary, symlink))

    if tool in internals:
        func = internals[tool]
        trymerge = func.trymerge
        onfailure = func.onfailure
    else:
        func = _xmerge
        trymerge = True
        onfailure = _("merging %s failed!\n")

    toolconf = tool, toolpath, binary, symlink

    if not trymerge:
        return func(repo, mynode, orig, fcd, fco, fca, toolconf)

    a = repo.wjoin(fd)
    b = temp("base", fca)
    c = temp("other", fco)
    back = a + ".orig"
    util.copyfile(a, back)

    if orig != fco.path():
        ui.status(_("merging %s and %s to %s\n") % (orig, fco.path(), fd))
    else:
        ui.status(_("merging %s\n") % fd)

    ui.debug("my %s other %s ancestor %s\n" % (fcd, fco, fca))

    markerstyle = ui.config('ui', 'mergemarkers', 'basic')
    if not labels:
        labels = _defaultconflictlabels
    if markerstyle != 'basic':
        labels = _formatlabels(repo, fcd, fco, fca, labels)

    needcheck, r = func(repo, mynode, orig, fcd, fco, fca, toolconf,
                        (a, b, c, back), labels=labels)
    if not needcheck:
        if r:
            if onfailure:
                ui.warn(onfailure % fd)
        else:
            util.unlink(back)

        util.unlink(b)
        util.unlink(c)
        return r

    if not r and (_toolbool(ui, tool, "checkconflicts") or
                  'conflicts' in _toollist(ui, tool, "check")):
        if re.search("^(<<<<<<< .*|=======|>>>>>>> .*)$", fcd.data(),
                     re.MULTILINE):
            r = 1

    checked = False
    if 'prompt' in _toollist(ui, tool, "check"):
        checked = True
        if ui.promptchoice(_("was merge of '%s' successful (yn)?"
                             "$$ &Yes $$ &No") % fd, 1):
            r = 1

    if not r and not checked and (_toolbool(ui, tool, "checkchanged") or
                                  'changed' in _toollist(ui, tool, "check")):
        if filecmp.cmp(a, back):
            if ui.promptchoice(_(" output file %s appears unchanged\n"
                                 "was merge successful (yn)?"
                                 "$$ &Yes $$ &No") % fd, 1):
                r = 1

    if _toolbool(ui, tool, "fixeol"):
        _matcheol(a, back)

#.........这里部分代码省略.........

            except IOError:
                report(_("failed to truncate %s\n") % f)
                raise
        else:
            try:
                opener.unlink(f)
            except (IOError, OSError), inst:
                if inst.errno != errno.ENOENT:
                    raise

    backupfiles = []
    for f, b, ignore in backupentries:
        filepath = opener.join(f)
        backuppath = opener.join(b)
        try:
            util.copyfile(backuppath, filepath)
            backupfiles.append(b)
        except IOError:
            report(_("failed to recover %s\n") % f)
            raise

    opener.unlink(journal)
    backuppath = "%s.backupfiles" % journal
    if opener.exists(backuppath):
        opener.unlink(backuppath)
    for f in backupfiles:
        opener.unlink(f)

class transaction(object):
    def __init__(self, report, opener, journal, after=None, createmode=None,
            onclose=None, onabort=None):

def filemerge(repo, mynode, orig, fcd, fco, fca):
    """perform a 3-way merge in the working directory

    mynode = parent node before merge
    orig = original local filename before merge
    fco = other file context
    fca = ancestor file context
    fcd = local file context for current/destination file
    """

    def temp(prefix, ctx):
        pre = "%s~%s." % (os.path.basename(ctx.path()), prefix)
        (fd, name) = tempfile.mkstemp(prefix=pre)
        data = repo.wwritedata(ctx.path(), ctx.data())
        f = os.fdopen(fd, "wb")
        f.write(data)
        f.close()
        return name

    def isbin(ctx):
        try:
            return util.binary(ctx.data())
        except IOError:
            return False

    if not fco.cmp(fcd.data()): # files identical?
        return None

    ui = repo.ui
    fd = fcd.path()
    binary = isbin(fcd) or isbin(fco) or isbin(fca)
    symlink = 'l' in fcd.flags() + fco.flags()
    tool, toolpath = _picktool(repo, ui, fd, binary, symlink)
    ui.debug(_("picked tool '%s' for %s (binary %s symlink %s)\n") %
               (tool, fd, binary, symlink))

    if not tool or tool == 'internal:prompt':
        tool = "internal:local"
        if ui.prompt(_(" no tool found to merge %s\n"
                       "keep (l)ocal or take (o)ther?") % fd,
                     (_("&Local"), _("&Other")), _("l")) != _("l"):
            tool = "internal:other"
    if tool == "internal:local":
        return 0
    if tool == "internal:other":
        repo.wwrite(fd, fco.data(), fco.flags())
        return 0
    if tool == "internal:fail":
        return 1

    # do the actual merge
    a = repo.wjoin(fd)
    b = temp("base", fca)
    c = temp("other", fco)
    out = ""
    back = a + ".orig"
    util.copyfile(a, back)

    if orig != fco.path():
        ui.status(_("merging %s and %s to %s\n") % (orig, fco.path(), fd))
    else:
        ui.status(_("merging %s\n") % fd)

    ui.debug(_("my %s other %s ancestor %s\n") % (fcd, fco, fca))

    # do we attempt to simplemerge first?
    if _toolbool(ui, tool, "premerge", not (binary or symlink)):
        r = simplemerge.simplemerge(ui, a, b, c, quiet=True)
        if not r:
            ui.debug(_(" premerge successful\n"))
            os.unlink(back)
            os.unlink(b)
            os.unlink(c)
            return 0
        util.copyfile(back, a) # restore from backup and try again

    env = dict(HG_FILE=fd,
               HG_MY_NODE=short(mynode),
               HG_OTHER_NODE=str(fco.changectx()),
               HG_MY_ISLINK='l' in fcd.flags(),
               HG_OTHER_ISLINK='l' in fco.flags(),
               HG_BASE_ISLINK='l' in fca.flags())

    if tool == "internal:merge":
        r = simplemerge.simplemerge(ui, a, b, c, label=['local', 'other'])
    elif tool == 'internal:dump':
        a = repo.wjoin(fd)
        util.copyfile(a, a + ".local")
        repo.wwrite(fd + ".other", fco.data(), fco.flags())
        repo.wwrite(fd + ".base", fca.data(), fca.flags())
        return 1 # unresolved
    else:
        args = _toolstr(ui, tool, "args", '$local $base $other')
        if "$output" in args:
            out, a = a, back # read input from backup, write to original
        replace = dict(local=a, base=b, other=c, output=out)
        args = re.sub("\$(local|base|other|output)",
                      lambda x: '"%s"' % replace[x.group()[1:]], args)
        r = util.system(toolpath + ' ' + args, cwd=repo.root, environ=env)

#.........这里部分代码省略.........