Music player in the sound settings: pick any calm track or automatic

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/menu.rs

@@ -67,12 +67,13 @@ pub enum Item {
     Events,
     TouchUi,
     Voice,
+    Track,
 }
 
 fn tab_items(tab: usize) -> &'static [Item] {
     use Item::*;
     match tab {
-        0 => &[Language, Volume, MusicVolume, Mute, Voice],
+        0 => &[Language, Volume, MusicVolume, Track, Mute, Voice],
         1 => &[RotateSpeed, PanSpeed, ZoomSpeed, EdgeScroll, InvertMouse],
         2 => &[Outlines, WallDetail, Lights, UiScale, RenderScale],
         3 => &[GameSpeed, Hints, Events, TouchUi],
@@ -108,6 +109,7 @@ fn item_label(it: Item) -> String {
         Item::Events => "set.events",
         Item::TouchUi => "set.touch_ui",
         Item::Voice => "set.voice",
+        Item::Track => "set.track",
     })
 }
 
@@ -126,6 +128,7 @@ fn item_value(it: Item, s: &Settings) -> String {
         Item::MusicVolume => pct(s.music_volume),
         Item::Mute => onoff(s.muted),
         Item::Voice => onoff(s.voice),
+        Item::Track => crate::audio::track_by_id(&s.music_track).map_or_else(|| tr("val.track_auto"), crate::audio::track_title),
         Item::RotateSpeed => pct(s.rotate_speed),
         Item::PanSpeed => pct(s.pan_speed),
         Item::ZoomSpeed => pct(s.zoom_speed),
@@ -184,6 +187,13 @@ fn item_change(it: Item, s: &mut Settings, d: i32) {
         Item::MusicVolume => s.music_volume = step(s.music_volume, d, 0.0, 1.0, 0.1),
         Item::Mute => s.muted = !s.muted,
         Item::Voice => s.voice = !s.voice,
+        Item::Track => {
+            // automatic, then every calm track
+            let mut opts: Vec<String> = vec![String::new()];
+            opts.extend(crate::audio::player_tracks().into_iter().map(|t| crate::audio::track_id(t).to_string()));
+            let i = opts.iter().position(|o| *o == s.music_track).unwrap_or(0) as i32;
+            s.music_track = opts[(i + d).rem_euclid(opts.len() as i32) as usize].clone();
+        }
         Item::RotateSpeed => s.rotate_speed = step(s.rotate_speed, d, 0.25, 2.5, 0.25),
         Item::PanSpeed => s.pan_speed = step(s.pan_speed, d, 0.25, 2.5, 0.25),
         Item::ZoomSpeed => s.zoom_speed = step(s.zoom_speed, d, 0.25, 2.5, 0.25),