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# plugins: handle add-on modules for rawdog.
# Copyright 2004, 2005 Adam Sampson <ats@offog.org>
#
# rawdog is free software; you can redistribute and/or modify it
# under the terms of that license as published by the Free Software
# Foundation; either version 2 of the License, or (at your option)
# any later version.
#
# rawdog 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 rawdog; see the file COPYING. If not, write to the Free
# Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301, USA, or see http://www.gnu.org/.
import os, imp
class Box:
"""Utility class that holds a mutable value. Useful for passing
immutable types by reference."""
def __init__(self, value = None):
self.value = value
plugin_count = 0
def load_plugins(dir, config):
global plugin_count
try:
files = os.listdir(dir)
except OSError:
# Ignore directories that can't be read.
return
for file in files:
if file == "" or file[0] == ".":
continue
desc = None
for d in imp.get_suffixes():
if file.endswith(d[0]) and d[2] == imp.PY_SOURCE:
desc = d
if desc is None:
continue
fn = os.path.join(dir, file)
config.log("Loading plugin ", fn)
f = open(fn, "r")
mod = imp.load_module("plugin%d" % (plugin_count,), f, fn, desc)
plugin_count += 1
f.close()
attached = {}
def attach_hook(hookname, func):
"""Attach a function to a hook. The function should take the
appropriate arguments for the hook, and should return either True or
False to indicate whether further functions should be processed."""
attached.setdefault(hookname, []).append(func)
def call_hook(hookname, *args):
"""Call all the functions attached to a hook with the given
arguments, in the order they were added, stopping if a hook function
returns False. Returns True if any hook function returned False (i.e.
returns True if any hook function handled the request)."""
for func in attached.get(hookname, []):
if not func(*args):
return True
return False
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