From 9fafb49af210e956d43d6a00106558d1a00d13df Mon Sep 17 00:00:00 2001
From: Simon Poirier <simpoir@gmail.com>
Date: Thu, 02 Jul 2009 05:27:27 +0000
Subject: * Modularized actions and event filters through add-on components

* Working serialization
* Working editor with addons
* began refactoring actions and events
** fixed some tests to work with addons
** filters and actions tests won't pass until refactoring is done
---
(limited to 'src/sugar/tutorius/addon.py')

diff --git a/src/sugar/tutorius/addon.py b/src/sugar/tutorius/addon.py
new file mode 100644
index 0000000..51791d1
--- /dev/null
+++ b/src/sugar/tutorius/addon.py
@@ -0,0 +1,76 @@
+# Copyright (C) 2009, Tutorius.org
+# Copyright (C) 2009, Simon Poirier <simpoir@gmail.com>
+#
+#
+# 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+"""
+This module manages the loading and listing of tutorius addons.
+Addons are modular actions and events that are package in such a way that they
+can be autodetected and can integrate with Tutorius components (the editor)
+without any configuration or explicit dependencies (python import).
+
+An action addon is expected to have a metadata dict such as this one:
+__action__ = {
+    "name" : "HelloWorld",
+    "display_name" : "Hello World!",
+    "icon" : "hello",
+    "class" : HelloAction,
+    "mandatory_props" : ["text"],
+}
+"""
+
+import os
+import re
+import logging
+
+PREFIX = __name__+"s"
+PATH = re.sub("addon\\.py[c]$", "", __file__)+"addons"
+
+_cache = None
+
+def _reload_addons():
+    global _cache
+    _cache = {}
+    for addon in filter(lambda x: x.endswith("py"), os.listdir(PATH)):
+        mod = __import__(PREFIX+'.'+re.sub("\\.py$", "", addon), {}, {}, [""])
+        if hasattr(mod, "__action__"):
+            _cache[mod.__action__['name']] = mod.__action__
+            continue
+        if hasattr(mod, "__event__"):
+            _cache[mod.__event__['name']] = mod.__event__
+
+def create(name, *args, **kwargs):
+    global _cache
+    if not _cache:
+        _reload_addons()
+    try:
+        return _cache[name]['class'](*args, **kwargs)
+    except KeyError:
+        logging.error("Addon not found for class '%s'", name)
+        return None
+
+def list_addons():
+    global _cache
+    if not _cache:
+        _reload_addons()
+    return _cache.keys()
+
+def get_addon_meta(name):
+    global _cache
+    if not _cache:
+        _reload_addons()
+    return _cache[name]
+
+# vim:set ts=4 sts=4 sw=4 et:
--
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