feat(theme): themes as files (theme crate: toml subset + ints, contrast check, wire); whimsy dark + light; display reads themes/, serves THEME/THEME_NAME, init SET_THEME -> THEME_CHANGED to all windows, bar themed; k-ui follows; settings appearance; init keeps choice in sealed users/<id>/settings/, reapplies at sign-in + display restart

crates/servers/display-server/src/tests/server.rs

@@ -61,7 +61,7 @@ impl Host for FakeHost {
 type Srv = DisplayServer<GridFramebuffer<W, H>, FakeHost>;
 
 fn server() -> Srv {
-    DisplayServer::new(GridFramebuffer::new(), FakeHost::default())
+    DisplayServer::new(GridFramebuffer::new(), FakeHost::default(), crate::themes::Themes::new())
 }
 
 /// Opens a window through launcher `opener`: its badge.
@@ -187,3 +187,48 @@ fn a_present_outside_the_window_is_clipped() {
     assert_eq!(s.framebuffer().pixel(31, H - 1), Some(RED));
     assert_ne!(s.framebuffer().pixel(29, H - 1), Some(RED), "left of the rectangle is untouched");
 }
+
+#[test]
+fn init_switches_the_theme_and_every_window_hears_of_it() {
+    let light = include_str!("../../../../../disk/themes/whimsy-light.toml");
+    let mut themes = crate::themes::Themes::new();
+    themes.add(light).unwrap();
+    let mut s = DisplayServer::new(GridFramebuffer::new(), FakeHost::default(), themes);
+    let t = open(&mut s, 1, b"Terminal");
+    let snake = open(&mut s, 2, b"Snake");
+    let (n1, n2) = (CapSlot::new(9).unwrap(), CapSlot::new(10).unwrap());
+    s.handle_call(t, [w::SUBSCRIBE, 0, 0, 0], Some(n1));
+    s.handle_call(snake, [w::SUBSCRIBE, 0, 0, 0], Some(n2));
+    let names: Vec<_> = (0..)
+        .map_while(|i| match s.handle_call(t, [w::THEME_NAME, i, 0, 0], None).0 {
+            [w::OK, a, b, c] => {
+                let (n, len) = w::unpack_name([a, b, c]);
+                Some(n[..len].to_vec())
+            }
+            _ => None,
+        })
+        .collect();
+    assert_eq!(names, [b"Whimsy Dark".to_vec(), b"Whimsy Light".to_vec()]);
+
+    let read = |s: &mut Srv| -> (usize, theme::Theme) {
+        let mut words = [0; w::THEME_WORDS];
+        let mut head = 0;
+        for part in 0..w::THEME_WORDS / 2 {
+            let r = s.handle_call(snake, [w::THEME, part, 0, 0], None).0;
+            assert_eq!(r[0], w::OK);
+            head = r[1];
+            words[part * 2..part * 2 + 2].copy_from_slice(&r[2..]);
+        }
+        (head >> 32, theme::wire::decode(words))
+    };
+    assert_eq!(read(&mut s).0, 0);
+    let n = w::pack_name(b"Whimsy Light");
+    assert_eq!(s.handle_call(5, [w::SET_THEME, n[0], n[1], n[2]], None).0[0], MALFORMED, "init's alone");
+    assert_eq!(s.handle_call(0, [w::SET_THEME, n[0], n[1], n[2]], None).0[0], w::OK);
+    let (index, t2) = read(&mut s);
+    assert_eq!((index, t2.background), (1, theme::parse(light).unwrap().background));
+    assert!(s.host().signalled.contains(&n1) && s.host().signalled.contains(&n2), "behind or in front");
+    assert_eq!(s.handle_call(t, [w::POLL, 0, 0, 0], None).0[0], w::THEME_CHANGED);
+    let bogus = w::pack_name(b"Nope");
+    assert_eq!(s.handle_call(0, [w::SET_THEME, bogus[0], bogus[1], bogus[2]], None).0[0], MALFORMED);
+}