"""implements bookmark-based branching (EXPERIMENTAL)

 - Disables creation of new branches (config: enable_branches=False).

 - Requires an active bookmark on commit (config: require_bookmark=True).

 - Doesn't move the active bookmark on update, only on commit.

 - Requires '--rev' for moving an existing bookmark.

 - Protects special bookmarks (config: protect=@).

 flow related commands

    :hg book NAME: create a new bookmark

    :hg book NAME -r REV: move bookmark to revision (fast-forward)

    :hg up|co NAME: switch to bookmark

    :hg push -B .: push active bookmark

"""

from __future__ import absolute_import

from mercurial.i18n import _

from mercurial import (

    bookmarks,

    commands,

    error,

    extensions,

    registrar,

)

MY_NAME = 'bookflow'

configtable = {}

configitem = registrar.configitem(configtable)

configitem(MY_NAME, 'protect', ['@'])

configitem(MY_NAME, 'require-bookmark', True)

configitem(MY_NAME, 'enable-branches', False)

cmdtable = {}

command = registrar.command(cmdtable)

def commit_hook(ui, repo, **kwargs):

    active = repo._bookmarks.active

    if active:

        if active in ui.configlist(MY_NAME, 'protect'):

            raise error.Abort(

                _('cannot commit, bookmark {} is protected').format(active))

        if not cwd_at_bookmark(repo, active):

            raise error.Abort(

       _('cannot commit, working directory out of sync with active bookmark'),

                hint=_("run 'hg up {}'").format(active))

    elif ui.configbool(MY_NAME, 'require-bookmark', True):

        raise error.Abort(_('cannot commit without an active bookmark'))

    return 0

def bookmarks_update(orig, repo, parents, node):

    if len(parents) == 2:

        # called during commit

        return orig(repo, parents, node)

    else:

        # called during update

        return False

def bookmarks_addbookmarks(

        orig, repo, tr, names, rev=None, force=False, inactive=False):

    if not rev:

        marks = repo._bookmarks

        for name in names:

            if name in marks:

                raise error.Abort(

                    _("bookmark {} already exists, to move use the --rev option"

                    ).format(name))

    return orig(repo, tr, names, rev, force, inactive)

def commands_commit(orig, ui, repo, *args, **opts):

    commit_hook(ui, repo)

    return orig(ui, repo, *args, **opts)

def commands_pull(orig, ui, repo, *args, **opts):

    rc = orig(ui, repo, *args, **opts)

    active = repo._bookmarks.active

    if active and not cwd_at_bookmark(repo, active):

        ui.warn(_(

            "working directory out of sync with active bookmark, run 'hg up {}'"

        ).format(active))

    return rc

def commands_branch(orig, ui, repo, label=None, **opts):

    if label and not opts.get(r'clean') and not opts.get(r'rev'):

        raise error.Abort(

         _("creating named branches is disabled and you should use bookmarks"),

            hint="see 'hg help bookflow'")

    return orig(ui, repo, label, **opts)

def cwd_at_bookmark(repo, mark):

    mark_id = repo._bookmarks[mark]

    cur_id = repo.lookup('.')

    return cur_id == mark_id

def uisetup(ui):

    extensions.wrapfunction(bookmarks, 'update', bookmarks_update)

    extensions.wrapfunction(bookmarks, 'addbookmarks', bookmarks_addbookmarks)

    extensions.wrapcommand(commands.table, 'commit', commands_commit)

    extensions.wrapcommand(commands.table, 'pull', commands_pull)

    if not ui.configbool(MY_NAME, 'enable-branches'):

        extensions.wrapcommand(commands.table, 'branch', commands_branch)