Implement a better config system

lib/config.py

@@ -0,0 +1,92 @@
+import json
+from typing import Optional
+
+CONFIG = 'config.json'
+config: dict = {
+    'inf19x-insiders-enable': False,
+    'loeh-cooldown': 20,
+    'loeh-enable': False,
+    'loeh-timeout': 10,
+    'prefix': 'och!',
+}
+config_meta: dict = {
+    'inf19x-insiders-enable': (
+        True,
+        'Enables university insider jokes of INF19X'
+    ),
+    'loeh-cooldown': (
+        True,
+        'Number of seconds between timeouts'
+    ),
+    'loeh-enable': (
+        True,
+        'Enable time-outing Löh'
+    ),
+    'loeh-timeout': (
+        True,
+        'The timeout for Löh in seconds'
+    ),
+    'prefix': (
+        False,
+        'Sets the prefix for this bot'
+    ),
+}
+
+
+def config_load() -> dict:
+    try:
+        config_file = open(CONFIG, 'r')
+        config.update(json.load(config_file))
+    except (json.JSONDecodeError, FileNotFoundError):
+        pass
+    return config
+
+
+def config_save():
+    with open(CONFIG, 'w') as config_file:
+        json.dump(config, config_file)
+
+
+def config_get(key: str, guild: Optional[int] = None):
+    guild = str(guild)
+    if guild in config:
+        guild = config[guild]
+        if key in guild:
+            return guild[key]
+    return config[key]
+
+
+def config_set(key: str, value, guild: Optional[int] = None) -> str:
+    if guild is None:
+        return _config_set_in_scope(config, key, value, type(config[key]))
+    else:
+        if config_meta[key][0]:
+            return _config_set_in_scope(config[str(guild)], key, value, type(config[key]))
+        else:
+            return 'This config can only be changed globally by the bot owner!'
+
+
+def config_get_descriptions() -> iter:
+    return map(lambda entry: (entry[0], entry[1]), config_meta.items())
+
+
+def _config_set_in_scope(scope: dict, key: str, value, cfg_type: type) -> str:
+    success = False
+    try:
+        if type(value) == cfg_type:
+            scope[key] = value
+            success = True
+        if type(value) == str:
+            if cfg_type == int:
+                scope[key] = int(value)
+                success = True
+            elif cfg_type == float:
+                scope[key] = float(value)
+                success = True
+    except (TypeError, ValueError):
+        success = False
+    if success:
+        config_save()
+        return 'Successfully updated config for `' + key + '`'
+    else:
+        return 'Unable to determine type of given argument'