remove singleton enforcement from plugins

The plugin system itself now enforces single instances.

beets/plugins.py

@@ -44,6 +44,8 @@ class BeetsPlugin(object):
         self.import_stages = []
         self.name = name or self.__module__.split('.')[-1]
         self.config = beets.config[self.name]
+        self.template_funcs = {}
+        self.template_fields = {}
 
     def commands(self):
         """Should return a list of beets.ui.Subcommand objects for

beetsplug/ihate.py

@@ -17,7 +17,6 @@
 import re
 import logging
 from beets.plugins import BeetsPlugin
-from beets import config
 from beets.importer import action
 
 
@@ -39,14 +38,10 @@ class IHatePlugin(BeetsPlugin):
     skip_album = []
     skip_whitelist = []
 
-    def __new__(cls, *args, **kwargs):
-        if cls._instance is None:
-            cls._instance = super(IHatePlugin,
-                                  cls).__new__(cls, *args, **kwargs)
-        return cls._instance
-    
     def __init__(self):
         super(IHatePlugin, self).__init__()
+        self.register_listener('import_task_choice',
+                               self.import_task_choice_event)
         self.config.add({
             'warn_genre': [],
             'warn_artist': [],
@@ -98,7 +93,7 @@ class IHatePlugin(BeetsPlugin):
                    ('warn_genre', 'warn_artist', 'warn_album',
                     'skip_genre', 'skip_artist', 'skip_album'))
 
-    def import_task_choice_event(self, task):
+    def import_task_choice_event(self, session, task):
         if task.choice_flag == action.APPLY:
             if self.job_to_do():
                 self._log.debug('[ihate] processing your hate')
@@ -122,8 +117,3 @@ class IHatePlugin(BeetsPlugin):
                 self._log.debug('[ihate] nothing to do')
         else:
             self._log.debug('[ihate] user made a decision, nothing to do')
-
-
-@IHatePlugin.listen('import_task_choice')
-def ihate_import_task_choice(task, session):
-    IHatePlugin().import_task_choice_event(task)

beetsplug/the.py

@@ -36,15 +36,11 @@ class ThePlugin(BeetsPlugin):
     strip = False
     patterns = []
 
-    def __new__(cls, *args, **kwargs):
-        if cls._instance is None:
-            cls._instance = super(ThePlugin,
-                                  cls).__new__(cls, *args, **kwargs)
-        return cls._instance
-
     def __init__(self):
         super(ThePlugin, self).__init__()
 
+        self.template_funcs['the'] = self.the_template_func
+
         self.config.add({
             'the': True,
             'a': True,
@@ -108,8 +104,3 @@ class ThePlugin(BeetsPlugin):
             return r
         else:
             return u''
-
-@ThePlugin.template_func('the')
-def func_the(text):
-    """Provides beets template function %the"""
-    return ThePlugin().the_template_func(text)

beetsplug/zero.py

@@ -30,15 +30,14 @@ class ZeroPlugin(BeetsPlugin):
     _instance = None
     _log = logging.getLogger('beets')
 
-    def __new__(cls, *args, **kwargs):
-        if cls._instance is None:
-            cls._instance = super(ZeroPlugin,
-                                  cls).__new__(cls, *args, **kwargs)
-        return cls._instance
-
     def __init__(self):
         super(ZeroPlugin, self).__init__()
 
+        # Listeners.
+        self.register_listener('write', self.write_event)
+        self.register_listener('import_task_choice',
+                               self.import_task_choice_event)
+
         self.config.add({
             'fields': [],
         })
@@ -57,7 +56,7 @@ class ZeroPlugin(BeetsPlugin):
                 except confit.NotFoundError:
                     self.patterns[f] = [u'']
 
-    def import_task_choice_event(self, task):
+    def import_task_choice_event(self, session, task):
         """Listen for import_task_choice event."""
         if task.choice_flag == action.ASIS and not self.warned:
             self._log.warn(u'[zero] cannot zero in \"as-is\" mode')
@@ -95,12 +94,3 @@ class ZeroPlugin(BeetsPlugin):
                 setattr(item, fn, type(fval)())
                 self._log.debug(u'[zero] {0}={1}'
                                 .format(fn, getattr(item, fn)))
-
-
-@ZeroPlugin.listen('import_task_choice')
-def zero_choice(session, task):
-    ZeroPlugin().import_task_choice_event(task)
-
-@ZeroPlugin.listen('write')
-def zero_write(item):
-    ZeroPlugin().write_event(item)

test/test_zero.py

@@ -6,12 +6,6 @@ from beetsplug.zero import ZeroPlugin
 
 
 class ZeroPluginTest(unittest.TestCase):
-
-    def test_singleton(self):
-        z1 = ZeroPlugin()
-        z2 = ZeroPlugin()
-        self.assertTrue(z1 is z2)
-
     def test_no_patterns(self):
         v = {'comments' : 'test comment',
              'day' : 13,