Add show name and track progress bar

README.md

@@ -1,8 +1,9 @@
 # subwave-nowplaying
 
 Tronbyt/Tidbyt app showing the current track on a [SUB/WAVE](https://github.com/perminder-klair/subwave)
-internet radio station: album art, track title, artist, and station name,
-with title/artist scrolling if they don't fit.
+internet radio station: album art, track title, artist, the current show
+name, and a progress bar for the track, with title/artist scrolling if they
+don't fit.
 
 Not tied to any specific station — set your own station's base URL in the
 app's config when adding it to a device.
@@ -24,6 +25,18 @@ app's config when adding it to a device.
   instead of stale track info.
 - If a track has no `subsonic_id`, or the cover fetch fails, falls back to a
   full-width layout with no art rather than a broken image.
+- Shows the current show name (`context.activeShow.name`) below the artist,
+  and a track progress bar at the bottom.
+
+**Progress bar caveat:** the now-playing API reports track `duration` but
+not elapsed/remaining time, so the app tracks playback position itself —
+the first time it sees a given `subsonic_id`, it stamps the current
+wall-clock time in pixlet's cache, then diffs against that stamp on later
+renders to compute elapsed seconds. This only works correctly on a
+long-lived server process with a persistent cache (true for
+`tronbyt/server`'s in-memory cache) — a one-shot `pixlet render` CLI
+invocation always starts a fresh process with an empty cache, so the bar
+will always show 0% when testing locally. This is expected, not a bug.
 
 **Note on unreachable hosts:** if the station URL is wrong or the host is
 completely unreachable (DNS failure, connection refused), `http.get` raises

subwave_nowplaying.star

@@ -1,13 +1,15 @@
 """
 Applet: SUB/WAVE Now Playing
 Summary: Shows what's playing on a SUB/WAVE station
-Description: Configure with your SUB/WAVE (github.com/perminder-klair/subwave) station's base URL to display the current track, artist, and album art.
+Description: Configure with your SUB/WAVE (github.com/perminder-klair/subwave) station's base URL to display the current track, artist, show, album art, and a progress bar.
 Author: poprhythm
 """
 
 load("render.star", "render")
 load("schema.star", "schema")
 load("http.star", "http")
+load("cache.star", "cache")
+load("time.star", "time")
 
 DEFAULT_STATION_URL = ""
 NOWPLAYING_TTL = 20
@@ -29,14 +31,18 @@ def main(config):
         return render.Root(child = _message_screen([now["station"], "offline"]))
 
     art = _fetch_cover(station_url, now["subsonic_id"])
+    progress = _track_progress(now["subsonic_id"], now["duration"])
 
-    text_column = render.Column(
-        children = [
-            render.Marquee(width = 32, child = render.Text(now["title"])),
-            render.Marquee(width = 32, child = render.Text(now["artist"], color = "#aaaaaa")),
-            render.Marquee(width = 32, child = render.Text(now["station"], font = "tom-thumb", color = "#666666")),
-        ],
-    )
+    lines = [
+        render.Marquee(width = 32, child = render.Text(now["title"])),
+        render.Marquee(width = 32, child = render.Text(now["artist"], color = "#aaaaaa")),
+    ]
+    if now["show"]:
+        lines.append(render.Marquee(width = 32, child = render.Text(now["show"], font = "tom-thumb", color = "#666666")))
+    if progress != None:
+        lines.append(_progress_bar(progress["fraction"], width = 32))
+
+    text_column = render.Column(children = lines)
 
     if art:
         content = render.Row(children = [render.Image(src = art, width = 32, height = 32), text_column])
@@ -61,6 +67,16 @@ def _message_screen(lines):
         children = [render.Text(line, font = "tom-thumb") for line in lines],
     )
 
+def _progress_bar(fraction, width = 32, height = 2):
+    filled = int(width * fraction + 0.5)
+    filled = max(0, min(filled, width))
+    children = []
+    if filled > 0:
+        children.append(render.Box(width = filled, height = height, color = "#66bb6a"))
+    if filled < width:
+        children.append(render.Box(width = width - filled, height = height, color = "#333333"))
+    return render.Row(children = children)
+
 def _fetch_now_playing(station_url):
     rep = http.get(station_url + "/api/now-playing", ttl_seconds = NOWPLAYING_TTL)
     if rep.status_code != 200:
@@ -69,12 +85,15 @@ def _fetch_now_playing(station_url):
     data = rep.json()
     np = data.get("nowPlaying", {})
     dj = data.get("dj", {})
+    active_show = data.get("context", {}).get("activeShow", {})
 
     return {
         "title": np.get("title", "Unknown title"),
         "artist": np.get("artist", "Unknown artist"),
         "subsonic_id": np.get("subsonic_id", ""),
+        "duration": np.get("duration", 0),
         "station": dj.get("station", "SUB/WAVE"),
+        "show": active_show.get("name", ""),
         "online": bool(data.get("streamOnline", False)),
     }
 
@@ -86,6 +105,34 @@ def _fetch_cover(station_url, subsonic_id):
         return None
     return rep.body()
 
+# The now-playing API reports track duration but not elapsed/remaining time,
+# so we track playback position ourselves: the first time we see a given
+# subsonic_id, we stamp the current wall-clock time in the cache; on later
+# renders (while the cache entry is still alive) we diff against that stamp
+# to get elapsed seconds. This only works on a long-lived server process
+# with a persistent cache (confirmed true for tronbyt/server's in-memory
+# cache) -- a one-shot `pixlet render` CLI call always starts a fresh
+# process with an empty cache, so progress will always show 0% locally.
+def _track_progress(subsonic_id, duration):
+    if not subsonic_id or not duration:
+        return None
+
+    key = "subwave_track_start_" + subsonic_id
+    now_unix = time.now().unix
+    cached = cache.get(key)
+
+    if cached == None:
+        cache.set(key, str(now_unix), ttl_seconds = int(duration) + 30)
+        start_unix = now_unix
+    else:
+        start_unix = int(cached)
+
+    elapsed = max(0, now_unix - start_unix)
+    remaining = max(0, duration - elapsed)
+    fraction = min(1.0, float(elapsed) / float(duration))
+
+    return {"elapsed": elapsed, "remaining": remaining, "fraction": fraction}
+
 def get_schema():
     return schema.Schema(
         version = "1",