feat(palette): sixteen ANSI colour ladders, cycled with c

beefy_player/widgets/common.py

@@ -19,23 +19,20 @@ from zoneinfo import ZoneInfo
 from rich.cells import cell_len
 from rich.text import Text
 
+from ..palettes import (
+    DEFAULT_PALETTE,
+    palette_stops,
+)
+
 LOCALTIME_PATH = "/etc/localtime"
 _UTC_NAMES = {"UTC", "UCT", "GMT", "ETC/UTC", "ETC/UCT", "ETC/GMT", "Z"}
 
 LEVELS = " ▁▂▃▄▅▆▇█"
 
-# Bottom-to-top spectrum colours, picked from the terminal's stock ANSI palette.
-SPECTRUM_STOPS = (
-    "cyan",
-    "blue",
-    "magenta",
-    "bright_magenta",
-    "yellow",
-    "bright_yellow",
-    "red",
-)
+def active_stops(app: object) -> tuple[str, ...]:
+    """The colour ladder the app is currently drawing with."""
+    return palette_stops(getattr(app, "palette", DEFAULT_PALETTE))
 
-ART_STOPS = ("blue", "magenta", "bright_magenta", "yellow", "cyan", "green")
 
 STATE_STYLE = {
     "playing": ("●", "green"),
@@ -182,7 +179,9 @@ def state_glyph(state: str) -> tuple[str, str]:
     return STATE_STYLE.get(state, STATE_STYLE["stopped"])
 
 
-def art_lines(key: str, width: int, height: int) -> list[Text]:
+def art_lines(
+    key: str, width: int, height: int, stops: tuple[str, ...]
+) -> list[Text]:
     """Procedural album art as a solid ANSI-colour mosaic.
 
     Filled block glyphs are used (never cell backgrounds), so the cover is
@@ -200,7 +199,7 @@ def art_lines(key: str, width: int, height: int) -> list[Text]:
             nx = column / max(1, width - 1)
             wave = 0.5 + 0.5 * math.sin(nx * 2.9 + ny * 2.1 + (seed % 11))
             position = (nx * 0.55 + (1.0 - ny) * 0.30 + wave * 0.15) % 1.0
-            colour = gradient(ART_STOPS, position)
+            colour = gradient(stops, position)
             # Mostly solid blocks with a little texture, like a tiny cover.
             glyph = "█" if ((seed + column * 7 + row * 11) % 17) not in (0, 5) else "▓"
             line.append(glyph, style=colour)