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# Copyright (C) 2007, 2008 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""Support for plugin hooking logic."""
from bzrlib.lazy_import import lazy_import
from bzrlib.symbol_versioning import deprecated_method, one_five
lazy_import(globals(), """
from bzrlib import (
errors,
)
""")
class Hooks(dict):
"""A dictionary mapping hook name to a list of callables.
e.g. ['FOO'] Is the list of items to be called when the
FOO hook is triggered.
"""
def __init__(self):
dict.__init__(self)
self._callable_names = {}
def get_hook_name(self, a_callable):
"""Get the name for a_callable for UI display.
If no name has been registered, the string 'No hook name' is returned.
We use a fixed string rather than repr or the callables module because
the code names are rarely meaningful for end users and this is not
intended for debugging.
"""
return self._callable_names.get(a_callable, "No hook name")
@deprecated_method(one_five)
def install_hook(self, hook_name, a_callable):
"""Install a_callable in to the hook hook_name.
:param hook_name: A hook name. See the __init__ method of BranchHooks
for the complete list of hooks.
:param a_callable: The callable to be invoked when the hook triggers.
The exact signature will depend on the hook - see the __init__
method of BranchHooks for details on each hook.
"""
self.install_named_hook(hook_name, a_callable, None)
def install_named_hook(self, hook_name, a_callable, name):
"""Install a_callable in to the hook hook_name, and label it name.
:param hook_name: A hook name. See the __init__ method of BranchHooks
for the complete list of hooks.
:param a_callable: The callable to be invoked when the hook triggers.
The exact signature will depend on the hook - see the __init__
method of BranchHooks for details on each hook.
:param name: A name to associate a_callable with, to show users what is
running.
"""
try:
self[hook_name].append(a_callable)
except KeyError:
raise errors.UnknownHook(self.__class__.__name__, hook_name)
if name is not None:
self.name_hook(a_callable, name)
def name_hook(self, a_callable, name):
"""Associate name with a_callable to show users what is running."""
self._callable_names[a_callable] = name
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