Add purge user from channel command

src/cogs/management.py

@@ -38,6 +38,57 @@ class Administration:
     async def _prune_user(self, ctx):
         pass
 
+    @_prune_user.command(name='channel', aliases=['channels', 'chans', 'chan', 'ch', 'c'])
+    async def _prune_user_channel(self, ctx, user: d.User, *channels: d.TextChannel):
+        def confirm(r, u):
+            if u is ctx.author:
+                if r.emoji == '\N{OCTAGONAL SIGN}':
+                    raise exc.Abort
+                if r.emoji == '\N{THUMBS UP SIGN}':
+                    return True
+            return False
+
+        if not channels:
+            channels = [ctx.channel]
+
+        try:
+            pruning = await ctx.send(f'\N{HOURGLASS} **Pruning** {user.mention}**\'s messages from** {"**,** ".join([channel.mention for channel in channels])} **might take some time.** Proceed, {ctx.author.mention}?')
+            await pruning.add_reaction('\N{THUMBS UP SIGN}')
+            await pruning.add_reaction('\N{OCTAGONAL SIGN}')
+            await asyncio.sleep(1)
+
+            await self.bot.wait_for('reaction_add', check=confirm, timeout=10 * 60)
+
+            deleting = await ctx.send(f'\N{WASTEBASKET} **Deleting** {user.mention}**\'s messages...**')
+            await asyncio.sleep(1)
+
+            c = 0
+            for channel in channels:
+                await deleting.edit(content=f'\N{WASTEBASKET} **Deleting** {user.mention}**\'s messages from** {channel.mention}')
+
+                deleted = await channel.purge(check=lambda m: m.author.id == user.id, before=pruning, limit=None)
+                c += len(deleted)
+
+            await asyncio.sleep(1)
+
+            for channel in channels:
+                missed = 0
+                async for message in channel.history(before=pruning, limit=None):
+                    if message.author.id == user.id:
+                        missed += 1
+
+                if missed > 0:
+                    await ctx.send(f'\N{DOUBLE EXCLAMATION MARK} `{missed}` **messages were not deleted in** {channel.mention}')
+
+            await ctx.send(f'\N{WHITE HEAVY CHECK MARK} **Finished deleting** `{c}` **of** {user.mention}**\'s messages**')
+
+        except exc.Abort:
+            await ctx.send('**Deletion aborted**', delete_after=7)
+            await ctx.message.add_reaction('\N{CROSS MARK}')
+        except TimeoutError:
+            await ctx.send('**Deletion timed out**', delete_after=7)
+            await ctx.message.add_reaction('\N{CROSS MARK}')
+
     @_prune_user.command(name='all', aliases=['a'], brief='Prune a user\'s messages from the guild', description='about flag centers on message 50 of 101 messages\n\npfg \{user id\} [before|after|about] [\{message id\}]\n\nExample:\npfg \{user id\} before \{message id\}', hidden=True)
     @cmds.is_owner()
     async def _prune_user_all(self, ctx, user, when=None, reference=None):