add mention checker to utils

bot.py

@@ -10,6 +10,8 @@ from pyzxz.pyzxz.pyzxz import ZeroXZero # :sob:
 from lastfmcollagegenerator.collage_generator import CollageGenerator
 # from catbox_async_uploader.catbox_async_uploader.core import CatboxAsyncUploader
 
+import utils as u
+
 class Bot(nerimity.Client):
     """Extended client class for extra functionality."""
     def __init__(self, lastfm_api_key: str, lastfm_api_secret: str,
@@ -101,7 +103,7 @@ class Bot(nerimity.Client):
             if not username:
                 await ctx.send(u.error_msg("Please provide a Last.fm username (or set yours with `/setfm`)."))
 
-        elif username.startswith("[@:"):
+        elif u.is_mention(username):
                 mentioned = self.get_user(username[3:-1])
                 try: username = await self.get_lastfm(mentioned.id)
                 except Exception as e:

utils.py

@@ -37,3 +37,8 @@ def error_msg(message: str) -> str:
 
 def good_msg(message: str) -> str:
     return f"[#52ff54][Success] [#reset]{message}"
+
+def is_mention(mention: str) -> bool:
+    if not mention: return None
+    
+    return True if mention.startswith("[@:") else False