Add `EventEmitter` + fix `User` constructor not being able to set key, values

2 files changed, 30 insertions, 0 deletions

diff --git a/discord/utils/__init__.py b/discord/utils/__init__.py
new file mode 100644
index 0000000..7fdb52b
--- /dev/null
+++ b/discord/utils/__init__.py
@@ -0,0 +1 @@
+from .event_emitter import *
\ No newline at end of file
diff --git a/discord/utils/event_emitter.py b/discord/utils/event_emitter.py
new file mode 100644
index 0000000..77fff72
--- /dev/null
+++ b/discord/utils/event_emitter.py
@@ -0,0 +1,29 @@
+import asyncio
+from types import NoneType
+from typing import Coroutine
+
+class EventEmitter():
+    def __init__(self):
+        self.listeners = {}
+
+    def add_listener(self, event_name: str, func: Coroutine):
+        if not self.listeners.get(event_name, None):
+            self.listeners[event_name] = {func}
+        else:
+            self.listeners[event_name].add(func)
+
+    def remove_listener(self, event_name: str, func: Coroutine):
+        self.listeners[event_name].remove(func)
+        if len(self.listeners[event_name]) == 0:
+            del self.listeners[event_name]
+
+    def emit(self, event_name: str, args_required=False, *args, **kwargs):
+        listeners = self.listeners.get(event_name, [])
+        for func in listeners:
+            if args_required:
+                if len(args) == 0:
+                    raise TypeError('event registered must have arguments')
+                else:
+                    asyncio.create_task(func(*args, **kwargs))
+            else:
+                asyncio.create_task(func(*args, **kwargs))