adds function to modlg API to get cases by member (#2453)

adds command using this to view all of a member's cases demonstrating this

closes #2266

redbot/cogs/modlog/modlog.py

@@ -1,4 +1,4 @@
-from typing import Optional
+from typing import Optional, Union
 
 import discord
 
@@ -6,6 +6,8 @@ from redbot.core import checks, modlog, commands
 from redbot.core.bot import Red
 from redbot.core.i18n import Translator, cog_i18n
 from redbot.core.utils.chat_formatting import box
+from redbot.core.utils.menus import menu, DEFAULT_CONTROLS
+
 
 _ = Translator("ModLog", __file__)
 
@@ -105,6 +107,37 @@ class ModLog(commands.Cog):
             else:
                 await ctx.send(await case.message_content(embed=False))
 
+    @commands.command()
+    @commands.guild_only()
+    async def casesfor(self, ctx: commands.Context, member: Union[discord.Member, int]):
+        """
+        Displays the cases for the specified member
+        """
+        try:
+            if isinstance(member, int):
+                cases = await modlog.get_cases_for_member(
+                    bot=ctx.bot, guild=ctx.guild, member_id=member
+                )
+            else:
+                cases = await modlog.get_cases_for_member(
+                    bot=ctx.bot, guild=ctx.guild, member=member
+                )
+        except discord.NotFound:
+            return await ctx.send(_("That user does not exist."))
+        except discord.HTTPException:
+            return await ctx.send(
+                _("Something unexpected went wrong while fetching that user by ID.")
+            )
+
+        if not cases:
+            return await ctx.send(_("That user does not have any cases."))
+
+        embed_requested = await ctx.embed_requested()
+
+        rendered_cases = [await case.message_content(embed=embed_requested) for case in cases]
+
+        await menu(ctx, rendered_cases, DEFAULT_CONTROLS)
+
     @commands.command()
     @commands.guild_only()
     async def reason(self, ctx: commands.Context, case: Optional[int], *, reason: str):