[Mod] Add [p]slowmode (#2734)

Makes use of new timedelta converter

redbot/cogs/mod/mod.py

@@ -12,6 +12,7 @@ from .kickban import KickBanMixin
 from .movetocore import MoveToCore
 from .mutes import MuteMixin
 from .names import ModInfo
+from .slowmode import Slowmode
 from .settings import ModSettings
 
 _ = T_ = Translator("Mod", __file__)
@@ -36,6 +37,7 @@ class Mod(
     MoveToCore,
     MuteMixin,
     ModInfo,
+    Slowmode,
     commands.Cog,
     metaclass=CompositeMetaClass,
 ):

redbot/cogs/mod/slowmode.py

@@ -0,0 +1,41 @@
+import re
+from .abc import MixinMeta
+from datetime import timedelta
+from redbot.core import commands, i18n, checks
+from redbot.core.utils.chat_formatting import humanize_timedelta
+
+_ = i18n.Translator("Mod", __file__)
+
+
+class Slowmode(MixinMeta):
+    """
+    Commands regarding channel slowmode management.
+    """
+
+    @commands.command()
+    @commands.guild_only()
+    @commands.bot_has_permissions(manage_channels=True)
+    @checks.admin_or_permissions(manage_channels=True)
+    async def slowmode(
+        self,
+        ctx,
+        *,
+        interval: commands.TimedeltaConverter(
+            minimum=timedelta(seconds=0), maximum=timedelta(hours=6)
+        ) = timedelta(seconds=0),
+    ):
+        """Changes channel's slowmode setting.
+
+        Interval can be anything from 0 seconds to 6 hours.
+        Use without parameters to disable.
+        """
+        seconds = interval.total_seconds()
+        await ctx.channel.edit(slowmode_delay=seconds)
+        if seconds > 0:
+            await ctx.send(
+                _("Slowmode interval is now {interval}.").format(
+                    interval=humanize_timedelta(timedelta=interval)
+                )
+            )
+        else:
+            await ctx.send(_("Slowmode has been disabled."))