feat(stage): show Bandcamp link in ON AIR

somafm_tui/app.py

@@ -17,7 +17,7 @@ from textual.css.query import NoMatches
 from textual.theme import Theme
 from textual.widgets import Input
 
-from . import api, artwork, config
+from . import api, artwork, bandcamp, config
 from .api import Station
 from .fallback import fallback_channels
 from .mpris import MprisService
@@ -133,6 +133,7 @@ class SomaFMApp(App[None]):
         self.artwork_url = ""
         self.artwork_bytes: bytes | None = None
         self._art_track_key = ""
+        self._bandcamp_key = ""
         self._http: httpx.AsyncClient | None = None
         self._closed = False
         self._tick_timer = None
@@ -415,8 +416,51 @@ class SomaFMApp(App[None]):
             )
         self.mpris.set_status(self._mpris_status())
         self.mpris.set_volume(self.volume / 100.0)
+        self._update_bandcamp()
         self._update_artwork()
 
+    def _update_bandcamp(self) -> None:
+        """Find a Bandcamp track link once per now-playing track."""
+        station = self.current
+        if station is None or self.offline or self._http is None:
+            return
+        song = station.now_playing
+        if song is None or not (song.artist.strip() or song.title.strip()):
+            return
+
+        track_key = f"{station.id}|{song.key()}"
+        if track_key == self._bandcamp_key:
+            return
+        self._bandcamp_key = track_key
+        self._fetch_bandcamp(
+            station.id, song.key(), song.artist, song.album, song.title
+        )
+
+    @work(exclusive=True, group="bandcamp", exit_on_error=False)
+    async def _fetch_bandcamp(
+        self,
+        station_id: str,
+        song_key: str,
+        artist: str,
+        album: str,
+        title: str,
+    ) -> None:
+        if self._http is None or self.offline:
+            return
+        url = await bandcamp.find_track(self._http, artist, album, title)
+        if not url:
+            return
+
+        station = next((s for s in self.stations if s.id == station_id), None)
+        if station is None or self.current is None or self.current.id != station_id:
+            return
+        song = station.now_playing
+        if song is None or song.key() != song_key:
+            return
+        song.bandcamp_url = url
+        with contextlib.suppress(NoMatches):
+            self.query_one(StagePanel).refresh_stage()
+
     def _refresh_art(self) -> None:
         with contextlib.suppress(NoMatches):
             self.query_one(StagePanel).refresh_art()
@@ -758,6 +802,7 @@ class SomaFMApp(App[None]):
 
     def action_refresh(self) -> None:
         self._last_history_fetch = 0.0
+        self._bandcamp_key = ""
         self._set_notice("refreshing…", 2)
         if self.offline:
             self._set_notice("offline mode — nothing to refresh", 3)