Ran update_copyright.py, updating all the copyright blurbs and adding AUTHORS.

[hooke.git] / hooke / plugin / __init__.py

diff --git a/hooke/plugin/__init__.py b/hooke/plugin/__init__.py
index 440c3bfa785f2f5fedbcb8508aa0111f8fb0ef9f..075cdffa0e063c7437a09a666e2f96967e6327dc 100644 (file)
--- a/hooke/plugin/__init__.py
+++ b/hooke/plugin/__init__.py
@@ -1,3 +1,21 @@
+# Copyright (C) 2010 W. Trevor King <wking@drexel.edu>
+#
+# This file is part of Hooke.
+#
+# Hooke is free software: you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation, either
+# version 3 of the License, or (at your option) any later version.
+#
+# Hooke 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 Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with Hooke.  If not, see
+# <http://www.gnu.org/licenses/>.
+
 """The `plugin` module provides optional submodules that add new Hooke
 commands.
 
@@ -7,7 +25,7 @@ All of the science happens in here.
 import ConfigParser as configparser
 
 from ..config import Setting
-from ..util.graph import Node, Graph
+from ..util.pluggable import IsSubclass, construct_graph
 
 
 PLUGIN_MODULES = [
@@ -38,6 +56,7 @@ default.  TODO: autodiscovery
 """
 
 BUILTIN_MODULES = [
+    'config',
     'debug',
     'note',
     'playlist',
@@ -93,81 +112,6 @@ class Builtin (Plugin):
 
 # Construct plugin dependency graph and load plugin instances.
 
-def construct_graph(this_modname, submodnames, class_selector,
-                    assert_name_match=True):
-    """Search the submodules `submodnames` of a module `this_modname`
-    for class objects for which `class_selector(class)` returns
-    `True`.  These classes are instantiated, and the `instance.name`
-    is compared to the `submodname` (if `assert_name_match` is
-    `True`).
-
-    The instances are further arranged into a dependency
-    :class:`hooke.util.graph.Graph` according to their
-    `instance.dependencies()` values.  The topologically sorted graph
-    is returned.
-    """
-    instances = {}
-    for submodname in submodnames:
-        count = len([s for s in submodnames if s == submodname])
-        assert count > 0, 'No %s entries: %s' % (submodname, submodnames)
-        assert count == 1, 'Multiple (%d) %s entries: %s' \
-            % (count, submodname, submodnames)
-        this_mod = __import__(this_modname, fromlist=[submodname])
-        submod = getattr(this_mod, submodname)
-        for objname in dir(submod):
-            obj = getattr(submod, objname)
-            if class_selector(obj):
-                instance = obj()
-                if assert_name_match == True and instance.name != submodname:
-                    raise Exception(
-                        'Instance name %s does not match module name %s'
-                        % (instance.name, submodname))
-                instances[instance.name] = instance
-    nodes = {}
-    for i in instances.values():     # make nodes for each instance
-        nodes[i.name] = Node(data=i)
-    for n in nodes.values():         # fill in dependencies for each node
-        n.extend([nodes[name] for name in n.data.dependencies()])
-    graph = Graph(nodes.values())
-    graph.topological_sort()
-    return graph
-
-class IsSubclass (object):
-    """A safe subclass comparator.
-    
-    Examples
-    --------
-
-    >>> class A (object):
-    ...     pass
-    >>> class B (A):
-    ...     pass
-    >>> C = 5
-    >>> is_subclass = IsSubclass(A)
-    >>> is_subclass(A)
-    True
-    >>> is_subclass = IsSubclass(A, blacklist=[A])
-    >>> is_subclass(A)
-    False
-    >>> is_subclass(B)
-    True
-    >>> is_subclass(C)
-    False
-    """
-    def __init__(self, base_class, blacklist=None):
-        self.base_class = base_class
-        if blacklist == None:
-            blacklist = []
-        self.blacklist = blacklist
-    def __call__(self, other):
-        try:
-            subclass = issubclass(other, self.base_class)
-        except TypeError:
-            return False
-        if other in self.blacklist:
-            return False
-        return subclass
-
 PLUGIN_GRAPH = construct_graph(
     this_modname=__name__,
     submodnames=[name for name,include in PLUGIN_MODULES] + BUILTIN_MODULES,