Fix the bugs in #1032945, Observer.list exceptions and exceptions when adding

an observer after a plugin reload.

plugins/Observer.py

@@ -56,11 +56,15 @@ def configure(advanced):
 
 class Probability(registry.Float):
     """Value must be a floating point number in the range (0, 1]."""
+    def __init__(self, *args, **kwargs):
+        self.__parent = super(Probability, self)
+        self.__parent.__init__(*args, **kwargs)
+
     def setValue(self, v):
         if not 0 < v <= 1:
             self.error()
         else:
-            super(Probability, self).setValue(v)
+            self.__parent.setValue(v)
 
 class Observers(registry.SpaceSeparatedListOfStrings):
     List = callbacks.CanonicalNameSet
@@ -103,9 +107,13 @@ class Observer(callbacks.Privmsg):
     def _isValidObserverName(self, name):
         return name != 'active' and registry.isValidRegistryName(name)
 
+    def __init__(self):
+        self.__parent = super(Observer, self)
+        self.__parent.__init__()
+
     def callCommand(self, *args, **kwargs):
         self.commandCalled = True
-        super(Observer, self).callCommand(*args, **kwargs)
+        self.__parent.callCommand(*args, **kwargs)
 
     def doPrivmsg(self, irc, msg):
         if self.commandCalled:
@@ -152,7 +160,7 @@ class Observer(callbacks.Privmsg):
             # We don't sort because order matters.
         else:
             observers = self.registryValue('observers')
-            utils.sortBy(str.lower, observers)
+            observers = utils.sorted(observers, key=str.lower)
         if observers:
             irc.reply(utils.commaAndify(observers))
         else:

src/utils.py

@@ -427,7 +427,7 @@ def sortBy(f, L):
 def sorted(iterable, cmp=None, key=None, reversed=False):
     L = list(iterable)
     if key is not None:
-        assert cmp is not None, 'Can\'t use both cmp and key.'
+        assert cmp is None, 'Can\'t use both cmp and key.'
         sortBy(key, L)
     else:
         L.sort(cmp)

test/test_Observer.py

@@ -51,6 +51,10 @@ class ObserverTestCase(ChannelPluginTestCase):
         self.assertResponse('testing, 1 2 3' , '1')
         self.assertNotError('observer disable digits')
 
+    def testList(self):
+        self.assertNotError('add foo m/foo/i echo I saw foo.')
+        self.assertRegexp('observer list', 'foo')
+
 
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