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# -*- coding: utf-8 -*-
#
# File: portato/plugin.py
# This file is part of the Portato-Project, a graphical portage-frontend.
#
# Copyright (C) 2007 René 'Necoro' Neumann
# This is free software. You may redistribute copies of it under the terms of
# the GNU General Public License version 2.
# There is NO WARRANTY, to the extent permitted by law.
#
# Written by René 'Necoro' Neumann <necoro@necoro.net>
"""A module containing the management of the plugin system."""
from __future__ import absolute_import
import os, os.path
from xml.dom.minidom import parse
from lxml import etree
from gettext import lgettext as _
from .constants import PLUGIN_DIR, XSD_LOCATION
from .helper import debug, info, warning, error, flatten
class PluginImportException (ImportError):
pass
class Options (object):
"""The <options>-element."""
__options = ("disabled", "blocking")
def __init__ (self, options = None):
self.disabled = False
self.blocking = False
if options:
self.parse(options)
def parse (self, options):
for opt in options:
nodes = opt.childNodes
type = str(nodes[0].nodeValue.strip())
if type in self.__options:
self.set(type, True)
def get (self, name):
return self.__getattribute__(name)
def set (self, name, value):
return self.__setattr__(name, value)
class Menu:
"""A single <menu>-element."""
def __init__ (self, plugin, label, call):
"""Constructor.
@param plugin: the plugin this menu belongs to
@type plugin: Plugin
@param label: the label to show
@type label: string
@param call: the function to call relative to the import statement
@type call: string
@raises PluginImportException: if the plugin's import could not be imported"""
self.label = label
self.plugin = plugin
if self.plugin.needs_import(): # get import
imp = self.plugin.get_import()
try:
mod = __import__(imp, globals(), locals(), [call])
except ImportError:
raise PluginImportException, imp
try:
self.call = eval("mod."+call) # build function
except AttributeError:
raise PluginImportException, imp
else:
try:
self.call = eval(call)
except AttributeError:
raise PluginImportException, imp
class Connect:
"""A single <connect>-element."""
def __init__ (self, hook, type, depend_plugin):
"""Constructor.
@param hook: the parent Hook
@type hook: Hook
@param type: the type of the connect ("before", "after", "override")
@type type: string
@param depend_plugin: a plugin we are dependant on
@type depend_plugin: string or None"""
self.type = type
self.hook = hook
self.depend_plugin = depend_plugin
def is_before_type (self):
return self.type == "before"
def is_after_type (self):
return self.type == "after"
def is_override_type (self):
return self.type == "override"
class Hook:
"""A single <hook>-element."""
def __init__ (self, plugin, hook, call):
"""Constructor.
@param plugin: the parent Plugin
@type plugin: Plugin
@param hook: the hook to add to
@type hook: string
@param call: the call to make
@type call: string"""
self.plugin = plugin
self.hook = hook
self.call = call
self.connects = []
def parse_connects (self, connects):
"""This gets a list of <connect>-elements and parses them.
@param connects: the list of <connect>'s
@type connects: NodeList"""
if not connects: # no connects - assume "before" connect
self.connects.append(Connect(self, "before", None))
for c in connects:
type = c.getAttribute("type")
if type == '':
type = "before"
# get dep_plugin if available
dep_plugin = None
if c.hasChildNodes():
nodes = c.childNodes
dep_plugin = nodes[0].nodeValue.strip()
connect = Connect(self, type, dep_plugin)
self.connects.append(connect)
class Plugin:
"""A complete plugin."""
(STAT_DISABLED, STAT_TEMP_ENABLED, STAT_ENABLED, STAT_TEMP_DISABLED) = range(4)
def __init__ (self, file, name, author):
"""Constructor.
@param file: the file name of the plugin.xml
@type file: string
@param name: the name of the plugin
@type name: Node
@param author: the author of the plugin
@type author: Node"""
self.file = file
self.name = name.firstChild.nodeValue.strip()
self.author = author.firstChild.nodeValue.strip()
self._import = None
self.hooks = []
self.menus = []
self.options = Options()
self.status = self.STAT_ENABLED
def parse_hooks (self, hooks):
"""Gets an <hooks>-elements and parses it.
@param hooks: the hooks node
@type hooks: Node"""
for h in hooks.getElementsByTagName("hook"):
hook = Hook(self, str(h.getAttribute("type")), str(h.getAttribute("call")))
hook.parse_connects(h.getElementsByTagName("connect"))
self.hooks.append(hook)
def parse_menus (self, menus):
"""Get a list of <menu>-elements and parses them.
@param menus: the menu nodelist
@type menus: NodeList"""
if menus:
for item in menus[0].getElementsByTagName("item"):
menu = Menu(self, item.firstChild.nodeValue.strip(), str(item.getAttribute("call")))
self.menus.append(menu)
def parse_options (self, options):
if options:
for o in options:
self.options.parse(o.getElementsByTagName("option"))
self.status = self.STAT_DISABLED if self.options.get("disabled") else self.STAT_ENABLED
def set_import (self, imports):
"""This gets a list of imports and parses them - setting the import needed to call the plugin.
@param imports: list of imports
@type imports: NodeList
@raises PluginImportException: if the plugin's import could not be imported"""
if imports:
self._import = str(imports[0].firstChild.nodeValue.strip())
try: # try loading
mod = __import__(self._import)
del mod
except ImportError:
raise PluginImportException, self._import
def needs_import (self):
"""Returns True if an import is required prior to calling the plugin.
@rtype: bool"""
return self._import is not None
def get_import (self):
"""Returns the module to import.
@rtype: string"""
return self._import
def get_option(self, name):
return self.options.get(name)
def set_option (self, name, value):
return self.options.set(name, value)
def is_enabled (self):
return (self.status in (self.STAT_ENABLED, self.STAT_TEMP_ENABLED))
class PluginQueue:
"""Class managing and loading the plugins."""
def __init__ (self, frontend, load = True):
"""Constructor.
@param frontend: the frontend used
@type frontend: string
@param load: if False nothing is loaded
@type load: bool"""
self.frontend = frontend
self.list = []
self.hooks = {}
if load:
self._load()
def get_plugins (self, list_disabled = True):
return [x for x in self.list if (x.is_enabled() or list_disabled)]
def get_plugin_data (self, list_disabled = False):
return [(x.name, x.author) for x in self.list if (x.is_enabled() or list_disabled)]
def get_plugin_menus (self, list_disabled = False):
return flatten([x.menus for x in self.list if (x.is_enabled() or list_disabled)])
def hook (self, hook, *hargs, **hkwargs):
"""This is a method taking care of calling the plugins.
B{Example}::
@pluginQueue.hook("some_hook", data)
def function (a, b, c):
orig_call(b,c,data)
def function (a, b, c):
hook = pluginQueue.hook("some_hook", data)
hook(orig_call)(b,c,data)
@param hook: the name of the hook
@type hook: string"""
def call (cmd):
"""Convienience function for calling a connect.
@param cmd: the actual Connect
@type cmd: Connect"""
imp = ""
if cmd.hook.plugin.needs_import(): # get import
imp = cmd.hook.plugin.get_import()
try:
mod = __import__(imp, globals(), locals(), [cmd.hook.call])
except ImportError:
error(_("%s cannot be imported."), imp)
return
try:
f = eval("mod."+cmd.hook.call) # build function
except AttributeError:
error(_("%s cannot be imported."), cmd.hook.call)
else:
try:
f = eval(cmd.hook.call)
except AttributeError:
error(_("%s cannot be imported."), cmd.hook.call)
return f(*hargs, **hkwargs) # call function
def hook_decorator (func):
"""This is the real decorator."""
if hook in self.hooks:
list = self.hooks[hook]
else:
list = ([],[],[])
# remove disabled
_list = ([],[],[])
for i in range(len(list)):
for cmd in list[i]:
if cmd.hook.plugin.is_enabled():
_list[i].append(cmd)
list = _list
def wrapper (*args, **kwargs):
ret = None
# before
for cmd in list
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