Add command to join threads that Didier is not in yet

cogs/events.py

@@ -109,6 +109,7 @@ class Events(commands.Cog):
         # Don't handle commands that have their own custom error handler
         if hasattr(ctx.command, 'on_error'):
             return
+
         # Someone just mentioned Didier without calling a real command,
         # don't care about this error
         if isinstance(err, (commands.CommandNotFound, commands.CheckFailure, commands.TooManyArguments, commands.ExpectedClosingQuoteError), ):
@@ -120,9 +121,11 @@ class Events(commands.Cog):
             await ctx.send("Geen message gevonden die overeenkomt met het opgegeven argument.")
         elif isinstance(err, (commands.ChannelNotFound, commands.ChannelNotReadable)):
             await ctx.send("Geen channel gevonden dat overeenkomt met het opgegeven argument.")
+        elif isinstance(err, commands.ThreadNotFound):
+            await ctx.reply("Thread niet gevonden.", mention_author=False)
         # Someone forgot an argument or passed an invalid argument
         elif isinstance(err, (commands.BadArgument, commands.MissingRequiredArgument, commands.UnexpectedQuoteError)):
-            await ctx.send("Controleer je argumenten.")
+            await ctx.reply("Controleer je argumenten.", mention_author=False)
         else:
             usage = stringFormatters.format_command_usage(ctx)
             await self.sendErrorEmbed(err, "Command", usage)

cogs/other.py

@@ -1,3 +1,4 @@
+import discord
 from discord.ext import commands
 
 from data.embeds.snipe import EditSnipe, DeleteSnipe
@@ -24,6 +25,16 @@ class Other(commands.Cog):
         """
         await custom_commands.CommandsList(ctx).send()
 
+    @commands.command(name="Join", usage="[Thread]")
+    @help.Category(category=Category.Didier)
+    async def join_thread(self, ctx, thread: discord.Thread):
+        """
+        Join threads
+        """
+        if thread.me is None:
+            await thread.join()
+            await ctx.message.add_reaction("✅")
+
     @commands.command(name="Snipe")
     @help.Category(category=Category.Other)
     async def snipe(self, ctx):

files/help.json

@@ -55,6 +55,7 @@
   "inspire": "Genereer quotes via [InspiroBot](https://inspirobot.me/).",
   "inventory": "Bekijk de items in jouw inventory.",
   "invest": "Investeer [Aantal] Didier Dinks in jouw Didier Bank om rente te vergaren.",
+  "join": "Laat Didier [Thread] joinen.",
   "jpl": "Informatie over de Jupiler Pro League.",
   "jpl matches": "Bekijk de wedstrijden die gespeeld worden op [Week]. Default naar de huidige speeldag.",
   "jpl table": "De huidige stand van het klassement.",