Implement hook system

HookSystem.py

@@ -0,0 +1,33 @@
+import os
+from Hook import Hook
+from model import model
+import importlib.machinery
+
+
+class HookSystem:
+    hooks_updated: list[Hook] = list()
+
+    def __init__(self):
+        # hooks load
+        for file_name in sorted(os.listdir('hooks')):
+            if file_name.endswith('.py') and not file_name[0] in ['.', '_']:
+                path = os.path.join('hooks', file_name)
+                hook_name = file_name[:-3]
+                module = importlib.machinery.SourceFileLoader(hook_name, path).load_module()
+                setup_func = getattr(module, 'setup', None)
+                if setup_func is not None:
+                    setup_func(self)
+
+                else:
+                    raise AttributeError(f'No setup method in {file_name} hook')
+
+    def add_update_hook(self, hook: Hook) -> None:
+        self.hooks_updated.append(hook)
+
+    def remove_update_hook(self, hook: Hook) -> None:
+        self.hooks_updated.remove(hook)
+
+    def notify_updated(self, action_id: int) -> None:
+        diff_record = model.get_diff_action_id(action_id)
+        for hook in self.hooks_updated:
+            hook.update(action_id, diff_record)