From 7fecf73ff0116005aebbdf2d9f3238ba7b714727 Mon Sep 17 00:00:00 2001
From: misson20000 <xenotoad@xenotoad.net>
Date: Wed, 26 Dec 2018 01:45:00 -0800
Subject: [PATCH] add clearreacts commands

---
 cogs/mod.py | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)

diff --git a/cogs/mod.py b/cogs/mod.py
index e88dc8b..96c56cb 100644
--- a/cogs/mod.py
+++ b/cogs/mod.py
@@ -1,3 +1,4 @@
+import asyncio
 import discord
 from discord.ext import commands
 import config
@@ -609,6 +610,85 @@ class Mod:
         else:
             await ctx.send(del_warn)
 
+    @commands.guild_only()
+    @commands.check(check_if_staff)
+    @commands.command()
+    async def clearreactsbyuser(self, ctx, user: discord.Member, *, channel: discord.TextChannel = None, limit: int = 50):
+        """Clears reacts from a given user in the given channel, staff only."""
+        log_channel = self.bot.get_channel(config.log_channel)
+        if not channel:
+            channel = ctx.channel
+        count = 0
+        async for msg in channel.history(limit = limit):
+            for react in msg.reactions:
+                if (await react.users().find(lambda u: u == user)) is not None:
+                    count = count + 1
+                    async for u in react.users():
+                        await msg.remove_reaction(react, u)
+        msg = f"✏️ **Cleared reacts**: {ctx.author.mention} cleared {user.mention}'s "\
+              f"reacts from the last {limit} messages in {channel.mention}."
+        await ctx.channel.send(f"Cleared {count} unique reactions")
+        await log_channel.send(msg)
+
+    @commands.guild_only()
+    @commands.check(check_if_staff)
+    @commands.command()
+    async def clearallreacts(self, ctx, *, limit: int = 50, channel: discord.TextChannel = None):
+        """Clears all reacts in a given channel, staff only. Use with care."""
+        log_channel = self.bot.get_channel(config.log_channel)
+        if not channel:
+            channel = ctx.channel
+        count = 0
+        async for msg in channel.history(limit = limit):
+            if msg.reactions:
+                count = count + 1
+                await msg.clear_reactions()
+        msg = f"✏️ **Cleared reacts**: {ctx.author.mention} cleared all "\
+              f"reacts from the last {limit} messages in {channel.mention}."
+        await ctx.channel.send(f"Cleared reacts from {count} messages!")
+        await log_channel.send(msg)
+        
+    @commands.guild_only()
+    @commands.check(check_if_staff)
+    @commands.command()
+    async def clearreactsinteractive(self, ctx):
+        """Clears reacts interactively, staff only. Use with care."""
+        log_channel = self.bot.get_channel(config.log_channel)
+
+        msg_text = f"{ctx.author.mention}, react to the reactions you want to remove. React to this message when you're done."
+        msg = await ctx.channel.send(msg_text)
+
+        tasks = []
+        
+        def check(event):
+            # we only care about the user who is clearing reactions
+            if event.user_id != ctx.author.id:
+                return False
+            # this is how the user finishes
+            if event.message_id == msg.id:
+                return True
+            else:
+                # remove a reaction
+                async def impl():
+                    msg = await self.bot.get_guild(event.guild_id).get_channel(event.channel_id).get_message(event.message_id)
+                    def check_emoji(r):
+                        if event.emoji.is_custom_emoji():
+                            return event.emoji.id == r.emoji.id
+                        else:
+                            return event.emoji.name == r.emoji # gotta love consistent APIs
+                    for reaction in filter(check_emoji, msg.reactions):
+                        async for u in reaction.users():
+                            await reaction.message.remove_reaction(reaction, u)
+                tasks.append(asyncio.create_task(impl())) # schedule immediately
+                return False
+        
+        try:
+            await self.bot.wait_for("raw_reaction_add", timeout=120.0, check=check)
+        except asyncio.TimeoutError:
+            await msg.edit(content = msg_text + " Timed out.")
+        else:
+            await asyncio.gather(*tasks)
+            await msg.edit(content = msg_text + " Done!")
 
 def setup(bot):
     bot.add_cog(Mod(bot))