feat: playlist import, show, and shuffle-on-load

Add !playlist import <name> <url> to resolve and save tracks from a URL
without queueing them. Add !playlist show <name> to display tracks in a
saved playlist via long_reply (auto-pastes on overflow). Add optional
'shuffle' keyword to !playlist load for randomized playback order.

plugins/music.py

@@ -1676,13 +1676,15 @@ async def _kept_repair(bot, message) -> None:
 
 @command("playlist", help="Music: !playlist save|load|list|del <name>")
 async def cmd_playlist(bot, message):
-    """Save, load, list, or delete named playlists.
+    """Save, load, list, delete, import, or show named playlists.
 
     Usage:
-        !playlist save <name>   Save current + queued tracks as a playlist
-        !playlist load <name>   Append saved playlist to queue and start playback
-        !playlist list          Show saved playlists with track counts
-        !playlist del <name>    Delete a saved playlist
+        !playlist save <name>          Save current + queued tracks as a playlist
+        !playlist load <name> [shuffle] Append saved playlist to queue
+        !playlist list                 Show saved playlists with track counts
+        !playlist del <name>           Delete a saved playlist
+        !playlist import <name> <url>  Import tracks from URL as a named playlist
+        !playlist show <name>          Display tracks in a saved playlist
     """
     if not _is_mumble(bot):
         await bot.reply(message, "Mumble-only feature")
@@ -1691,7 +1693,7 @@ async def cmd_playlist(bot, message):
     parts = message.text.split()
     if len(parts) < 2:
         await bot.reply(
-            message, "Usage: !playlist save|load|list|del <name>",
+            message, "Usage: !playlist save|load|list|del|import|show <name>",
         )
         return
 
@@ -1723,9 +1725,10 @@ async def cmd_playlist(bot, message):
 
     elif sub == "load":
         if len(parts) < 3:
-            await bot.reply(message, "Usage: !playlist load <name>")
+            await bot.reply(message, "Usage: !playlist load <name> [shuffle]")
             return
         name = parts[2].lower()
+        shuffle = len(parts) >= 4 and parts[3].lower() == "shuffle"
         raw = bot.state.get("music", f"playlist:{name}")
         if not raw:
             await bot.reply(message, f"No playlist named '{name}'")
@@ -1746,9 +1749,12 @@ async def cmd_playlist(bot, message):
                 requester=e.get("requester", "?"),
             ))
             added += 1
+        if shuffle and ps["queue"]:
+            random.shuffle(ps["queue"])
+        suffix = " (shuffled)" if shuffle else ""
         await bot.reply(
             message,
-            f"Loaded '{name}': {added} track{'s' if added != 1 else ''}",
+            f"Loaded '{name}': {added} track{'s' if added != 1 else ''}{suffix}",
         )
         if was_idle:
             _ensure_loop(bot)
@@ -1791,9 +1797,58 @@ async def cmd_playlist(bot, message):
         bot.state.delete("music", f"playlist:{name}")
         await bot.reply(message, f"Deleted playlist '{name}'")
 
+    elif sub == "import":
+        if len(parts) < 4:
+            await bot.reply(message, "Usage: !playlist import <name> <url>")
+            return
+        name = parts[2].lower()
+        url = parts[3]
+        await bot.reply(message, f"Importing '{name}' from URL...")
+        loop = asyncio.get_running_loop()
+        try:
+            resolved = await loop.run_in_executor(None, _resolve_tracks, url)
+        except Exception:
+            await bot.reply(message, "Failed to resolve URL")
+            return
+        if not resolved:
+            await bot.reply(message, "No tracks found")
+            return
+        requester = message.nick or "?"
+        entries = [{"url": u, "title": t, "requester": requester}
+                   for u, t in resolved]
+        bot.state.set("music", f"playlist:{name}", json.dumps(entries))
+        await bot.reply(
+            message,
+            f"Imported playlist '{name}' ({len(entries)} track"
+            f"{'s' if len(entries) != 1 else ''})",
+        )
+
+    elif sub == "show":
+        if len(parts) < 3:
+            await bot.reply(message, "Usage: !playlist show <name>")
+            return
+        name = parts[2].lower()
+        raw = bot.state.get("music", f"playlist:{name}")
+        if not raw:
+            await bot.reply(message, f"No playlist named '{name}'")
+            return
+        try:
+            entries = json.loads(raw)
+        except (json.JSONDecodeError, TypeError):
+            await bot.reply(message, f"Corrupt playlist '{name}'")
+            return
+        if not entries:
+            await bot.reply(message, f"Playlist '{name}' is empty")
+            return
+        lines = [f"Playlist '{name}' ({len(entries)} tracks):"]
+        for i, e in enumerate(entries, 1):
+            title = _truncate(e.get("title", e["url"]))
+            lines.append(f"  {i:>2}. {title}")
+        await bot.long_reply(message, lines, label=name)
+
     else:
         await bot.reply(
-            message, "Usage: !playlist save|load|list|del <name>",
+            message, "Usage: !playlist save|load|list|del|import|show <name>",
         )