Fix shared memory initializators not working (fixes #20)

Also added some tests for Component.add_shared_memory_initializer, in
order to prevent this issue in the future.

This is a regression introduced in 350a78a.

Author: Pietro Albini

botogram/hooks.py

@@ -68,7 +68,9 @@ class ProcessMessageHook(Hook):
 
 class SharedMemoryInitializerHook(Hook):
     """Underlying hook for @bot.init_shared_memory"""
-    pass
+
+    def call(self, memory):
+        return self.func(memory)
 
 
 class NoCommandsHook(Hook):

botogram/shared.py

@@ -137,7 +137,7 @@ def apply_inits(self, component, memory):
             return
 
         for init in self._inits[component]:
-            init(memory)
+            init.call(memory)
 
     def switch_driver(self, driver=None):
         """Use another driver for this shared memory"""

tests/test_components.py

@@ -259,6 +259,27 @@ def sample3(chat, message, args):
     assert sample3_processed == True
 
 
+def test_add_shared_memory_initializer(bot, sample_update):
+    expected = "test"
+    actual = None
+
+    def initializer(shared):
+        shared["test"] = expected
+
+    def command(bot, shared):
+        nonlocal actual
+        actual = shared["test"]
+
+    comp = botogram.Component("test")
+    comp.add_shared_memory_initializer(initializer)
+    comp.add_process_message_hook(command)
+
+    bot.use(comp)
+    bot.process(sample_update)
+
+    assert actual == expected
+
+
 def test_add_timer(bot):
     global_bot = bot
 

tests/test_shared.py

@@ -8,6 +8,7 @@
 import pickle
 
 import botogram.shared
+import botogram.hooks
 
 
 def test_shared_memory_creation():
@@ -37,8 +38,12 @@ def init1(shared):
     def init2(shared):
         shared["b"] = 1
 
-    shared.register_inits_list("comp1", [init1, init2])
-    shared.register_inits_list("comp2", [init1])
+    comp = botogram.Component()
+    init1_hook = botogram.hooks.SharedMemoryInitializerHook(init1, comp)
+    init2_hook = botogram.hooks.SharedMemoryInitializerHook(init2, comp)
+
+    shared.register_inits_list("comp1", [init1_hook, init2_hook])
+    shared.register_inits_list("comp2", [init1_hook])
 
     memory1 = shared.of("bot1", "comp1")
     memory2 = shared.of("bot1", "comp2")