feat: add YouTube search to !play and fix NA URL fallback

Non-URL input (e.g. !play classical music) searches YouTube for 10
results and picks one randomly. Also fixes --flat-playlist returning
"NA" as the URL for single videos by falling back to the original
input URL.

docs/CHEATSHEET.md

@@ -548,6 +548,7 @@ HTML stripped on receive, escaped on send. IRC-only commands are no-ops.
 ```
 !play <url|playlist>     # Play audio (YouTube, SoundCloud, etc.)
 !play <playlist-url>     # Playlist tracks expanded into queue
+!play classical music    # YouTube search, random pick from top 10
 !stop                    # Stop playback, clear queue
 !skip                    # Skip current track
 !queue                   # Show queue

docs/USAGE.md

@@ -1566,6 +1566,7 @@ and voice transmission.
 
 ```
 !play <url|playlist> Play audio or add to queue (playlists expanded)
+!play <query>        Search YouTube, play a random result
 !stop                Stop playback, clear queue
 !skip                Skip current track
 !queue               Show queue
@@ -1576,6 +1577,8 @@ and voice transmission.
 ```
 
 - Queue holds up to 50 tracks
+- Non-URL input is treated as a YouTube search; 10 results are fetched
+  and one is picked randomly
 - Playlists are expanded into individual tracks; excess tracks are
   truncated at the queue limit
 - Volume changes ramp smoothly over ~200ms (no abrupt jumps)

plugins/music.py

@@ -4,6 +4,7 @@ from __future__ import annotations
 
 import asyncio
 import logging
+import random
 import subprocess
 from dataclasses import dataclass
 
@@ -51,6 +52,11 @@ def _truncate(text: str, max_len: int = _MAX_TITLE_LEN) -> str:
     return text[: max_len - 3].rstrip() + "..."
 
 
+def _is_url(text: str) -> bool:
+    """Check if text looks like a URL rather than a search query."""
+    return text.startswith(("http://", "https://", "ytsearch:"))
+
+
 def _resolve_tracks(url: str, max_tracks: int = _MAX_QUEUE) -> list[tuple[str, str]]:
     """Resolve URL into (url, title) pairs via yt-dlp. Blocking, run in executor.
 
@@ -73,8 +79,10 @@ def _resolve_tracks(url: str, max_tracks: int = _MAX_QUEUE) -> list[tuple[str, s
         for i in range(0, len(lines) - 1, 2):
             track_url = lines[i].strip()
             track_title = lines[i + 1].strip()
-            if track_url:
+            # --flat-playlist prints "NA" for single videos (no extraction)
-                tracks.append((track_url, track_title or track_url))
+            if not track_url or track_url == "NA":
+                track_url = url
+            tracks.append((track_url, track_title or track_url))
         return tracks if tracks else [(url, url)]
     except Exception:
         return [(url, url)]
@@ -126,12 +134,13 @@ def _ensure_loop(bot) -> None:
 # -- Commands ----------------------------------------------------------------
 
 
-@command("play", help="Music: !play <url|playlist>")
+@command("play", help="Music: !play <url|query>")
 async def cmd_play(bot, message):
     """Play a URL or add to queue if already playing.
 
     Usage:
-        !play <url>     Play audio from URL (YouTube, SoundCloud, etc.)
+        !play <url>       Play audio from URL (YouTube, SoundCloud, etc.)
+        !play <query>     Search YouTube and play the first result
 
     Playlists are expanded into individual tracks. If the queue is nearly
     full, only as many tracks as will fit are enqueued.
@@ -142,10 +151,13 @@ async def cmd_play(bot, message):
 
     parts = message.text.split(None, 1)
     if len(parts) < 2:
-        await bot.reply(message, "Usage: !play <url>")
+        await bot.reply(message, "Usage: !play <url|query>")
         return
 
     url = parts[1].strip()
+    is_search = not _is_url(url)
+    if is_search:
+        url = f"ytsearch10:{url}"
     ps = _ps(bot)
 
     if len(ps["queue"]) >= _MAX_QUEUE:
@@ -156,6 +168,10 @@ async def cmd_play(bot, message):
     loop = asyncio.get_running_loop()
     resolved = await loop.run_in_executor(None, _resolve_tracks, url, remaining)
 
+    # Search: pick one random result instead of enqueuing all
+    if is_search and len(resolved) > 1:
+        resolved = [random.choice(resolved)]
+
     was_idle = ps["current"] is None
     requester = message.nick or "?"
     added = 0

tests/test_music.py

@@ -134,6 +134,25 @@ class TestPlayCommand:
         assert len(ps["queue"]) == 1
         assert ps["queue"][0].title == "Test Track"
 
+    def test_play_search_query(self):
+        bot = _FakeBot()
+        msg = _Msg(text="!play classical music")
+        tracks = [
+            ("https://youtube.com/watch?v=a", "Result 1"),
+            ("https://youtube.com/watch?v=b", "Result 2"),
+            ("https://youtube.com/watch?v=c", "Result 3"),
+        ]
+        with patch.object(_mod, "_resolve_tracks", return_value=tracks) as mock_rt:
+            with patch.object(_mod, "_ensure_loop"):
+                asyncio.run(_mod.cmd_play(bot, msg))
+        # Should prepend ytsearch10: for non-URL input
+        mock_rt.assert_called_once()
+        assert mock_rt.call_args[0][0] == "ytsearch10:classical music"
+        # Should pick one random result, not enqueue all
+        ps = _mod._ps(bot)
+        assert len(ps["queue"]) == 1
+        assert any("Playing" in r for r in bot.replied)
+
     def test_play_shows_queued_when_busy(self):
         bot = _FakeBot()
         ps = _mod._ps(bot)
@@ -354,6 +373,21 @@ class TestMusicHelpers:
         assert len(result) == 80
         assert result.endswith("...")
 
+    def test_is_url_http(self):
+        assert _mod._is_url("https://youtube.com/watch?v=abc") is True
+
+    def test_is_url_plain_http(self):
+        assert _mod._is_url("http://example.com") is True
+
+    def test_is_url_ytsearch(self):
+        assert _mod._is_url("ytsearch:classical music") is True
+
+    def test_is_url_search_query(self):
+        assert _mod._is_url("classical music") is False
+
+    def test_is_url_single_word(self):
+        assert _mod._is_url("jazz") is False
+
 
 # ---------------------------------------------------------------------------
 # TestPlaylistExpansion
@@ -431,6 +465,14 @@ class TestPlaylistExpansion:
             tracks = _mod._resolve_tracks("https://example.com/v1")
         assert tracks == [("https://example.com/v1", "Single Video")]
 
+    def test_resolve_tracks_na_url_fallback(self):
+        """--flat-playlist prints NA for single videos; use original URL."""
+        result = MagicMock()
+        result.stdout = "NA\nSingle Video\n"
+        with patch("subprocess.run", return_value=result):
+            tracks = _mod._resolve_tracks("https://example.com/v1")
+        assert tracks == [("https://example.com/v1", "Single Video")]
+
     def test_resolve_tracks_playlist(self):
         """Subprocess returning multiple url+title pairs."""
         result = MagicMock()