check for existing leetcode thread

nightly/nightly/night.py

@@ -26,6 +26,12 @@ FORMATTED_CODE_REGEX = re.compile(
 # https://github.com/python-discord/bot-core/blob/main/pydis_core/utils/regex.py#L44C1-L49C2
 RAW_CODE_REGEX = re.compile(r"^(?:[ \t]*\n)*" r"(?P<code>.*?)" r"\s*$", flags=re.DOTALL)
 
+async def threads(channel: discord.TextChannel):
+    for t in channel.threads:
+        yield t
+    async for t in channel.archived_threads():
+        yield t
+
 
 # https://github.com/python-discord/bot/blob/main/bot/exts/utils/snekbox/_cog.py#L97
 class CodeblockConverter(commands.Converter):
@@ -106,6 +112,10 @@ class Night(commands.Cog):
                 if not isinstance(ctx.channel, discord.TextChannel):
                     await ctx.reply("not available outside text channels")
                     return
+                async for thread in threads(ctx.channel):
+                    if thread.name == title:
+                        await ctx.reply(f"exists: {thread.jump_url}")
+                        return
                 thread = await ctx.channel.create_thread(name=title, type=discord.ChannelType.public_thread)
                 message = await thread.send(f"https://leetcode.com/problems/{name}/")
                 if not ctx.bot_permissions.manage_messages: