Merge branch 'config-cache'

A read was a lock, a hash of the path and a conversion (a colour parsed from its text),
160 to 570 ns in the unoptimised shell, a few hundred a frame with a card open. Now an
atomic load and a copy while nothing changed. Every write to the settings goes through
change(), which bumps the generation the caches compare against

README.md

@@ -113,7 +113,7 @@ Whether the open card takes the song cover's colours instead (`appearance.colors
 
 ## Side pills
 
-Two small one-icon pills sit left of the island and two right of it, on every monitor; they move outward while the island opens. A click morphs a pill into its card. Only one card is open across the shell: opening the island closes a card, and opening a card closes the island. Esc, the cross or a click elsewhere closes it.
+Two small one-icon pills sit left of the island and two right of it, on every monitor, each in its own colour (`pills.colors.*`; Home's follows the sky). A click grows a pill into a big card in the middle of the top of the screen; meanwhile the row becomes a carousel: the other pills and the island's pill line up two left and two right of the card in their usual order (around Home: AI and System left, the island and the bell right), and clicking one switches straight to its card (the island's pill closes the card, then opens the island). A closing card shrinks back into its own pill's place. Only one card is open across the shell. Esc, the cross or a click elsewhere closes it.
 
 - **AI** (sparkle): a chat with an Ollama model on your own servers, `gemma4:e4b` at `http://localhost:11434` by default. `pills.ai.servers` takes several, comma-separated, in order: the model chip in the header lists every server's models (each once, with its server when there are several) and switches at once, and a question goes to the first server that has the chosen model. Answers stream in through curl. When Ollama doesn't answer, the shell starts the OpenRC service with `doas rc-service ollama start` (`pills.ai.start_service`). Stop ends an answer and New chat starts over. Nothing goes to a cloud service, only to the servers listed.
 - **System** (pulse): CPU, the integrated GPU's clock, the external GPU's load (with its video memory and the programs on it, formerly in the control centre), memory, swap, network and disk read/write as graphs over the last minute, plus the hottest sensors with icons, in cool/warm/hot colours (`pills.monitor.warm|hot`). Everything is read from `/proc` and `/sys`, so there is no process list. Processes opens `ghostty --class=amane.monitor -e btm` on the special workspace `monitor`; a second press shows or hides it.
@@ -134,6 +134,8 @@ The config window edits the same file: Settings at the foot of the control centr
 
 `appearance.surface.design` picks what the island, the pills, the tray menu, the control centre and its popups are made of: `solid` (the wallpaper's gradient with an accent glow), `frosted` (a thin tint, a hairline white rim, a sheen along the top, a soft shadow) or `liquid` (clear glass, denser toward the bottom right, a light-catching edge, the accent's glow). Each design's opacity, rim and light are settings of their own (`appearance.solid|frosted|liquid.*`); the look itself is `src/surface.rs`, drawn by one shader (`src/surface.wgsl`: the shadow, the fill and the sheen or lit edge in one pass; the rim stays a border). On see-through glass a face fades with `.opacity()` instead of a veil, a GPU layer only while it fades.
 
+Screenshots of each design, from when they were made: `docs/design/` (`base-solid-card.png`, `base-glass-0.5-card.png` for solid below 1, `frosted-0.62-card.png`, `liquid-0.4-card.png`, and a board for each glass design: the card three times side by side, with the pills below).
+
 ### Performance
 
 Amane draws rectangles, borders, letters and pictures as cheap quads, and gradients, shadows and `Canvas` paths with vello, which renders over the whole window and then lays the result on top. vello keeps a result between frames only when its shapes didn't change and hold no gradient, so anything drawn with it on every frame costs a pass over the whole window. What redraws every frame is therefore kept off vello: the surfaces are a shader, the pill's bars are rounded rectangles, the candle ring and the equalizer's curve are shaders (`src/ring.wgsl`, `src/curve.wgsl`). A shader's file is written to `$XDG_RUNTIME_DIR/magic-island/` when it is first drawn. A shader must not contain the word `time`, or amane redraws its window on every frame.

src/config.rs

@@ -1,7 +1,10 @@
 use std::collections::HashMap;
 use std::fs;
 use std::path::PathBuf;
+use std::cell::RefCell;
+use std::sync::atomic::{AtomicU64, Ordering};
 use std::sync::{LazyLock, Mutex, PoisonError, RwLock};
+use std::thread::LocalKey;
 
 use amane::Color;
 
@@ -181,7 +184,11 @@ macro_rules! settings {
                 $(
                     #[allow(dead_code)]
                     pub fn $name() -> $ty {
-                        super::super::get(concat!(stringify!($module), ".", stringify!($group), ".", stringify!($name)), || $default)
+                        std::thread_local! {
+                            static SLOT: std::cell::RefCell<(u64, Option<$ty>)> = const { std::cell::RefCell::new((0, None)) };
+                        }
+
+                        super::super::cached(&SLOT, concat!(stringify!($module), ".", stringify!($group), ".", stringify!($name)), || $default)
                     }
                 )*
             } )*
@@ -504,25 +511,38 @@ settings! {
         layout {
             gap: f32 = 10.0, 0..=200; "Space between the island's pill and the small pills beside it"
             spacing: f32 = 8.0, 0..=100; "Space between the small pills on one side"
-            icon: f32 = 16.0, 6..=40; "Size of the small pills' icons"
+            icon: f32 = 18.0, 6..=40; "Size of the small pills' icons"
             open_ms: u64 = 420, 0..=5000; "How long a small pill takes to open into its card, and to close"
-            radius: f32 = 22.0, 0..=60; "Corner radius of the opened cards"
-            pad: f32 = 18.0, 0..=60; "Padding inside the opened cards"
-            reveal_at: f32 = 0.2, 0..=1; "How much of a closing card's growth is left when the pills beside it start to show again behind it (0 = only once it's closed)"
+            radius: f32 = 28.0, 0..=60; "Corner radius of the opened cards"
+            pad: f32 = 24.0, 0..=60; "Padding inside the opened cards"
+        }
+        colors {
+            ai: Color = Color::rgb(160, 128, 255); "The AI pill's own colour, mixed into its pill and card"
+            monitor: Color = Color::rgb(64, 208, 190); "The system monitor pill's own colour"
+            notifications: Color = Color::rgb(255, 128, 104); "The notification pill's own colour"
+            home_clear_day: Color = Color::rgb(255, 190, 92); "The home pill's colour under a clear or partly cloudy day sky"
+            home_clear_night: Color = Color::rgb(104, 118, 230); "The home pill's colour on a clear night"
+            home_cloudy: Color = Color::rgb(150, 170, 200); "The home pill's colour under clouds (and before the weather is known)"
+            home_fog: Color = Color::rgb(176, 176, 190); "The home pill's colour in fog"
+            home_rain: Color = Color::rgb(84, 156, 244); "The home pill's colour in rain"
+            home_snow: Color = Color::rgb(206, 232, 255); "The home pill's colour in snow"
+            home_storm: Color = Color::rgb(160, 104, 230); "The home pill's colour in a storm"
+            pill_mix: f32 = 0.55, 0..=1; "How much of its own colour a small pill takes (0 = the wallpaper's only)"
+            card_mix: f32 = 0.28, 0..=1; "How much of its pill's colour an open card takes"
         }
         ai {
-            width: f32 = 440.0, 280..=1200; "Width of the AI card"
-            height: f32 = 520.0, 200..=1200; "Height of the AI card"
+            width: f32 = 760.0, 280..=1400; "Width of the AI card"
+            height: f32 = 680.0, 200..=1200; "Height of the AI card"
             servers: String = String::from("http://localhost:11434"); "The Ollama servers the AI card talks to, comma-separated, in order: the model list shows all their models, a question goes to the first that has the chosen one"
             model: String = String::from("gemma4:e4b"); "The Ollama model to chat with, with its tag (ollama list shows them)"
             start_service: bool = true; "Start the local ollama service (doas rc-service ollama start) when it isn't answering"
             system: String = String::from("You are a helpful assistant inside a Linux desktop shell. Answer briefly and plainly."); "What the model is told before every chat"
         }
         monitor {
-            width: f32 = 420.0, 280..=1200; "Width of the system monitor card"
+            width: f32 = 620.0, 280..=1400; "Width of the system monitor card"
             interval_ms: u64 = 1000, 200..=10000; "How often the system monitor reads the system"
             history: usize = 60, 10..=600; "How many readings the graphs show"
-            graph_height: f32 = 34.0, 10..=200; "Height of each graph"
+            graph_height: f32 = 46.0, 10..=200; "Height of each graph"
             temperatures: usize = 6, 0..=20; "How many temperature sensors to show, always in the same order: CPU, iGPU, eGPU, NVMe, memory, board, then the rest"
             warm: f32 = 65.0, 20..=120; "From this temperature (°C) a sensor shows in the warm colour"
             hot: f32 = 85.0, 20..=130; "From this temperature (°C) a sensor shows in the hot colour"
@@ -535,7 +555,7 @@ settings! {
             workspace: String = String::from("processes"); "The special workspace the process list opens on"
         }
         home {
-            width: f32 = 820.0, 300..=1600; "Width of the home card. It opens rightwards from beside the island, so on a 1920 px wide monitor about 820 fits"
+            width: f32 = 880.0, 300..=1600; "Width of the home card. It opens in the middle with the AI, system and island pills on its left, which on a 1920 px wide monitor leaves room for about 900 beside the workspace pill"
             clock_size: f32 = 64.0, 20..=200; "Size of the big clock"
             clock_font: String = String::new(); "The big clock's font family, any installed one (fc-list : family lists them); empty takes the shell's font"
             clock_weight: u64 = 700, 100..=900; "The big clock's weight, 100 (thin) to 900 (black); a font without that weight shows its nearest one"
@@ -596,15 +616,18 @@ settings! {
             blocked: String = String::new(); "Apps whose notifications are dropped at once, comma-separated (Block app on a notification adds it)"
         }
         history {
-            width: f32 = 420.0, 280..=1200; "Width of the notification card"
-            height: f32 = 560.0, 200..=1400; "Height of the notification card"
+            width: f32 = 620.0, 280..=1400; "Width of the notification card"
+            height: f32 = 700.0, 200..=1400; "Height of the notification card"
         }
     }
 }
 
-// what config.toml set, by path; a missing or bad setting takes its default
+// what config.toml set, by path; a missing or bad setting takes its default. written only through change()
 static VALUES: LazyLock<RwLock<HashMap<String, Value>>> = LazyLock::new(Default::default);
 
+// how many times VALUES changed; an accessor's cached answer from an older count is read again
+static GENERATION: AtomicU64 = AtomicU64::new(1);
+
 // what was wrong in the file when it was last read, for the config window
 static ERRORS: Mutex<Vec<String>> = Mutex::new(Vec::new());
 
@@ -619,11 +642,43 @@ fn written() -> std::sync::MutexGuard<'static, String> {
     WRITTEN.lock().unwrap_or_else(PoisonError::into_inner)
 }
 
-// ponytail: a lock and a hash lookup per call, a few hundred a frame; a snapshot struct if a profile ever shows it
 fn get<T: Setting>(path: &str, default: impl FnOnce() -> T) -> T {
     VALUES.read().unwrap_or_else(PoisonError::into_inner).get(path).and_then(T::read).unwrap_or_else(default)
 }
 
+// an accessor's last answer on this thread, with the GENERATION it was read at
+type Slot<T> = LocalKey<RefCell<(u64, Option<T>)>>;
+
+/*
+ * what every accessor (settings!) returns: its last answer while VALUES hasn't changed
+ * since, else a fresh get(). a few hundred reads a frame with a card open, each a lock,
+ * a hash of the path and a conversion (a colour parsed from its text) at 160 to 570 ns
+ * unoptimised; a cached one is an atomic load and a copy, 13 ns. per thread, so it takes
+ * no lock. a read racing a change may return the old value once, as get() could
+ */
+fn cached<T: Setting + Clone>(slot: &'static Slot<T>, path: &str, default: impl FnOnce() -> T) -> T {
+    let now = GENERATION.load(Ordering::Acquire);
+
+    if let Some(value) = slot.with_borrow(|(seen, value)| value.clone().filter(|_| *seen == now)) {
+        return value;
+    }
+
+    let value = get(path, default);
+
+    slot.set((now, Some(value.clone())));
+
+    value
+}
+
+// every change to VALUES: made, then counted (the write lock is gone by then), so the accessors read again
+fn change<R>(edit: impl FnOnce(&mut HashMap<String, Value>) -> R) -> R {
+    let done = edit(&mut VALUES.write().unwrap_or_else(PoisonError::into_inner));
+
+    GENERATION.fetch_add(1, Ordering::Release);
+
+    done
+}
+
 pub fn file() -> PathBuf {
     theme::config_file("config.toml")
 }
@@ -670,8 +725,8 @@ pub fn reread() -> bool {
 // shell.conf's four settings, moved to their places in config.toml
 fn migrate() {
     let old = fs::read_to_string(theme::config_file("shell.conf")).unwrap_or_default();
-    let mut values = VALUES.write().unwrap_or_else(PoisonError::into_inner);
 
+    change(|values| {
         for (key, text) in parse::settings(&old) {
             let path = match key.as_str() {
                 "cover_colors" => "appearance.colors.cover_colors",
@@ -687,6 +742,7 @@ fn migrate() {
                 values.insert(path.to_string(), value);
             }
         }
+    });
 }
 
 // the file's text, read anew: what it sets replaces everything set before
@@ -703,7 +759,7 @@ pub fn apply_text(text: &str) {
         }
     }
 
-    *VALUES.write().unwrap_or_else(PoisonError::into_inner) = values;
+    change(|old| *old = values);
     *ERRORS.lock().unwrap_or_else(PoisonError::into_inner) = errors;
 
     hypr::sync_soon();
@@ -803,7 +859,7 @@ pub fn set(path: &str, value: Value) -> Result<(), String> {
 
     let mut written = written();
 
-    VALUES.write().unwrap_or_else(PoisonError::into_inner).insert(path.to_string(), value);
+    change(|values| values.insert(path.to_string(), value));
 
     save(&mut written)
 }
@@ -812,7 +868,7 @@ pub fn set(path: &str, value: Value) -> Result<(), String> {
 pub fn reset(path: &str) -> Result<(), String> {
     let mut written = written();
 
-    VALUES.write().unwrap_or_else(PoisonError::into_inner).remove(path);
+    change(|values| values.remove(path));
 
     save(&mut written)
 }
@@ -991,3 +1047,29 @@ pub fn label(name: &str) -> String {
 
     title(name)
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    // the cached accessors follow every change, on this thread and on others
+    #[test]
+    fn accessors_follow_changes() {
+        let (width, family, accent) = (island::pill::width(), appearance::font::family(), appearance::fallback::accent());
+
+        change(|values| {
+            values.insert("island.pill.width".into(), Value::Float(321.0));
+            values.insert("appearance.font.family".into(), Value::Text("Iosevka".into()));
+            values.insert("appearance.fallback.accent".into(), Value::Text("#102030".into()));
+        });
+
+        assert_eq!(island::pill::width(), 321.0);
+        assert_eq!(appearance::font::family(), "Iosevka");
+        assert_eq!(appearance::fallback::accent(), Color::rgb(16, 32, 48));
+        assert_eq!(std::thread::spawn(island::pill::width).join().unwrap(), 321.0);
+
+        change(|values| values.clear());
+
+        assert_eq!((island::pill::width(), appearance::font::family(), appearance::fallback::accent()), (width, family, accent));
+    }
+}

src/home.rs

@@ -349,7 +349,11 @@ fn sync_settings() -> (String, String, String, bool) {
     (agenda_settings::account(), agenda_settings::server(), agenda_settings::contacts_server(), agenda_settings::birthdays())
 }
 
-// whether the card has a form to type into: then it keeps the keyboard and stays open
+// the sky now and whether it's day, once the weather is known (the home pill takes its colour from it)
+pub fn sky() -> Option<(parse::Sky, bool)> {
+    Forecast::read().weather.as_ref().map(|weather| (parse::sky(weather.code), weather.is_day))
+}
+
 // the event form closes without saving
 fn cancel() {
     Agenda::write().form = None;
@@ -366,6 +370,7 @@ pub fn escape() -> bool {
     open
 }
 
+// whether the card has a form to type into: then it keeps the keyboard and stays open
 pub fn typing() -> bool {
     Agenda::read().form.is_some()
 }

src/island.rs

@@ -225,8 +225,12 @@ pub fn view(monitor: &Monitor) -> LayerWindow {
         .space(Zone::Ignore)
         .namespace("magic-island");
 
-    // out of sight: empty and click-through (never hidden, see below), and nothing else read, so a playing player doesn't redraw it
-    if slide <= -edge::hide_h() {
+    /*
+     * out of sight: empty and click-through (never hidden, see below), and nothing else
+     * read, so a playing player doesn't redraw it. also while a side pill's card is open in
+     * the middle: the pods' window draws this pill in the row beside it meanwhile
+     */
+    if slide <= -edge::hide_h() || crate::pods::holds_island(here) {
         return window.click_through().child(Rectangle::new().width(0.0).height(0.0));
     }
 
@@ -297,9 +301,9 @@ pub fn view(monitor: &Monitor) -> LayerWindow {
 
             veiled(card(&scene), width, height, radius, reveal, &colors)
         }
-        Some(player) if pill > 0.0 => veiled(compact(player, playing(player, &island), &art.path, levels), width, height, radius, pill, &colors),
+        Some(player) if pill > 0.0 => veiled(compact(player, playing(player, &island), &art.path, levels, c::pill::width()), width, height, radius, pill, &colors),
         None if reveal > 0.0 => veiled(crate::last::card(), width, height, radius, reveal, &colors),
-        None if pill > 0.0 => veiled(idle(), width, height, radius, pill, &colors),
+        None if pill > 0.0 => veiled(idle_face(c::pill::width()), width, height, radius, pill, &colors),
         // mid-grow: the empty shape alone, the cheapest frames of the animation
         _ => Rectangle::new().width(0.0).height(0.0),
     };
@@ -356,8 +360,74 @@ pub fn view(monitor: &Monitor) -> LayerWindow {
     )
 }
 
+/*
+ * the island's pill as the side pills' carousel draws it while one of their cards is
+ * open in the middle (the island's own window leaves it to them meanwhile, see
+ * pods::holds_island). `small` shrinks it from the pill (0) to its least (1): the song's
+ * cover, or its live bars when there's no cover, or a note with nothing playing. the
+ * pill's face fades out over the first half, the small one in over the second
+ */
+pub fn pill_face(monitor: &str, small: f32) -> Rectangle {
+    let media = Media::read();
+    let island = Island::read();
+    let colors = theme::now().surfaces();
+    let art = Art::read();
+    let h = c::pill::height();
+
+    let player = shown(&media, island.selected.as_deref());
+    let small_w = small_width_for(player.is_some(), &art.path);
+    let width = mix(c::pill::width(), small_w, small);
+
+    let live = player.is_some() && focused_monitor().as_deref().is_none_or(|name| name == monitor);
+    let spectrum = live.then(Spectrum::read);
+    let levels: &[f32] = spectrum.as_deref().map_or(&[], |spectrum| spectrum.levels.as_slice());
+
+    if !levels.is_empty() {
+        amane::request_frame();
+    }
+
+    /*
+     * the pill's face fades out, then the small one in: they swap halfway, or with nothing
+     * playing as soon as the shape gets too narrow for the words, so these never vanish while seen
+     */
+    let turn = if player.is_some() { 0.5 } else { ((c::pill::width() - idle_room()) / (c::pill::width() - small_w).max(1.0)).clamp(0.05, 0.5) };
+
+    let face = if small < turn {
+        let big = match player {
+            Some(player) => compact(player, playing(player, &island), &art.path, levels, width),
+            None => idle_face(width),
+        };
+
+        veiled(big, width, h, h / 2.0, 1.0 - small / turn, &colors)
+    } else {
+        let little: Box<dyn Widget> = match player {
+            Some(_) if !art.path.is_empty() => Box::new(cover(&art.path, h - 10.0, 1.5, false)),
+            Some(player) => Box::new(pill_levels(playing(player, &island), levels)),
+            None => Box::new(icon(Glyph::Note, IDLE_NOTE, theme::now().accent)),
+        };
+
+        veiled(Rectangle::new().width(width).height(h).align_child(Center, Center).child(Stack::new(vec![little])), width, h, h / 2.0, (small - turn) / (1.0 - turn), &colors)
+    };
+
+    surface::shell(width, h, h / 2.0, &colors, 0.0, face)
+}
+
+// the island's pill at its least in the carousel: as wide as tall with a cover or nothing playing, else room for its bars
+pub fn small_width() -> f32 {
+    let media = Media::read();
+    let island = Island::read();
+
+    small_width_for(shown(&media, island.selected.as_deref()).is_some(), &Art::read().path)
+}
+
+fn small_width_for(playing_something: bool, art: &str) -> f32 {
+    let h = c::pill::height();
+
+    if !playing_something || !art.is_empty() { h } else { (c::pill::bars_width() + 24.0).max(h) }
+}
+
 // a click on the island of `monitor`: closes an open dropdown, else opens the card there
-fn tap(monitor: &str) {
+pub fn tap(monitor: &str) {
     let mut island = Island::write();
 
     if island.menu.take().is_none() {
@@ -587,21 +657,36 @@ pub fn faded(color: Color, alpha: u8) -> Color {
     Color::rgba(color.red(), color.green(), color.blue(), alpha)
 }
 
-// the pill while no player is open: a music note and "Nothing playing"; the words only
-// where they fit with half the pill's height to spare at each end, else the note alone, so it never nears the rim
-fn idle() -> Rectangle {
-    let (width, h, note) = (c::pill::width(), c::pill::height(), 15.0);
-    let words = Text::new("Nothing playing").size(text::body()).color(theme::now().dim);
-    let fits = matches!(words.width(), amane::Size::Fixed(words_w) if note + 8.0 + words_w + h <= width);
+/*
+ * a note and "Nothing playing", centred. the words only where they fit with half the
+ * pill's height to spare at each end, else the note alone: an elided text takes the whole
+ * width, which put the note against the rim, and a pill narrower than the words did too
+ */
+fn idle_face(width: f32) -> Rectangle {
+    let note = icon(Glyph::Note, IDLE_NOTE, theme::now().accent);
+    let row = if idle_room() <= width { Row::new(children![note, idle_words()]) } else { Row::new(children![note]) };
 
-    let row = if fits { Row::new(children![icon(Glyph::Note, note, theme::now().accent), words]) } else { Row::new(children![icon(Glyph::Note, note, theme::now().accent)]) };
-    Rectangle::new().width(width).height(h).align_child(Center, Center).child(row.gap(8.0).align(Center))
+    Rectangle::new().width(width).height(c::pill::height()).align_child(Center, Center).child(row.gap(8.0).align(Center))
 }
 
-// the pill: cover, title, the player's live levels
-fn compact(player: &MediaPlayer, playing: bool, art: &str, levels: &[f32]) -> Rectangle {
+const IDLE_NOTE: f32 = 15.0;
+
+fn idle_words() -> Text {
+    Text::new("Nothing playing").size(text::body()).color(theme::now().dim)
+}
+
+// the width the note and the words need, with half the pill's height to spare at each end
+fn idle_room() -> f32 {
+    match idle_words().width() {
+        amane::Size::Fixed(words) => IDLE_NOTE + 8.0 + words + c::pill::height(),
+        amane::Size::Parent => f32::MAX,
+    }
+}
+
+// the pill, `width` wide: cover, title, the player's live levels
+fn compact(player: &MediaPlayer, playing: bool, art: &str, levels: &[f32], width: f32) -> Rectangle {
     Rectangle::new()
-        .width(c::pill::width())
+        .width(width)
         .height(c::pill::height())
         .padding(Padding { top: 0.0, right: 12.0, bottom: 0.0, left: 6.0 })
         .child(

src/main.rs

@@ -47,9 +47,9 @@ fn main() {
         .window_per_monitor(edge::spacer)
         .window_per_monitor(edge::view)
         .window_per_monitor(island::view)
-        // the small pills beside the island, and their cards
-        .window_per_monitor(pods::left)
-        .window_per_monitor(pods::right)
+        // the small pills beside the island, and their cards in the middle
+        .window_per_monitor(pods::row_view)
+        .window_per_monitor(pods::card_view)
         .window_per_monitor(workspaces::view)
         .window_per_monitor(control::view)
         .window_per_monitor(control::menu_view)

src/pods.rs

@@ -8,20 +8,27 @@ use amane::{
 };
 
 use crate::config::appearance::{motion, overlays, text};
-use crate::config::island::{card as island_card, pill as island_pill};
+use crate::config::island::pill as island_pill;
 use crate::config::notifications::history;
-use crate::config::pills::{self as settings, layout};
+use crate::config::pills::{self as settings, colors as hues, layout};
 use crate::edge::{self, Edge};
 use crate::glyph::{Glyph, icon};
 use crate::island::{self, CLEAR, mix, phases, veiled};
+use crate::parse::Sky;
 use crate::{ai, home, notices, stats, surface, theme};
 
 /*
- * four small one-icon pills beside the island, each opening into a card the way the
- * island does: left of it the AI chat and the system monitor, right of it home and
- * notifications. one window per side and monitor (magic-pods-left|right) placed beside
- * the island's pill; while the island opens they move out of its way. one card at a
- * time across the shell: opening one collapses the island and the other way round
+ * four small one-icon pills beside the island, each opening into a big card in the
+ * middle of the top of the screen. while a card is open the row becomes a carousel:
+ * every other pill and the island's pill line up left and right of the card in their
+ * usual order ([AI][System] island [Home][Bell]), and clicking one switches to its card.
+ * a closing card shrinks back into its own pill's place.
+ *
+ * one window per monitor (magic-pods), as wide as the monitor and anchored to its left
+ * edge, so it never moves: only its height changes, at the top edge. while a card is
+ * open it also draws the island's pill (island::pill_face), which the island's own
+ * window leaves out meanwhile (holds_island); the two overlap for a moment at each
+ * hand-over, at the same place, so the pill never blinks
  */
 #[derive(Clone, Copy, PartialEq, Eq, Hash, Debug)]
 pub enum Pod {
@@ -31,15 +38,18 @@ pub enum Pod {
     Notifications,
 }
 
-// left of the island, outermost first; right of it, innermost first
-const LEFT: [Pod; 2] = [Pod::Ai, Pod::Monitor];
-const RIGHT: [Pod; 2] = [Pod::Home, Pod::Notifications];
+// the row, left to right
+#[derive(Clone, Copy, PartialEq, Eq)]
+enum Item {
+    Pod(Pod),
+    Island,
+}
+
+const ROW: [Item; 5] = [Item::Pod(Pod::Ai), Item::Pod(Pod::Monitor), Item::Island, Item::Pod(Pod::Home), Item::Pod(Pod::Notifications)];
+
+const PODS: [Pod; 4] = [Pod::Ai, Pod::Monitor, Pod::Home, Pod::Notifications];
 
 impl Pod {
-    fn left(self) -> bool {
-        matches!(self, Self::Ai | Self::Monitor)
-    }
-
     fn glyph(self) -> Glyph {
         match self {
             Self::Ai => Glyph::Sparkle,
@@ -59,6 +69,24 @@ impl Pod {
         }
     }
 
+    // its own colour; home's follows the sky
+    fn hue(self) -> Color {
+        match self {
+            Self::Ai => hues::ai(),
+            Self::Monitor => hues::monitor(),
+            Self::Notifications => hues::notifications(),
+            Self::Home => match home::sky() {
+                Some((Sky::Clear | Sky::PartlyCloudy, true)) => hues::home_clear_day(),
+                Some((Sky::Clear | Sky::PartlyCloudy, false)) => hues::home_clear_night(),
+                Some((Sky::Cloudy, _)) | None => hues::home_cloudy(),
+                Some((Sky::Fog, _)) => hues::home_fog(),
+                Some((Sky::Rain, _)) => hues::home_rain(),
+                Some((Sky::Snow, _)) => hues::home_snow(),
+                Some((Sky::Storm, _)) => hues::home_storm(),
+            },
+        }
+    }
+
     // whether its card takes typing: then it has the keyboard and stays open when the pointer leaves
     fn types(self) -> bool {
         self == Self::Ai || (self == Self::Home && home::typing())
@@ -74,16 +102,25 @@ impl Pod {
     }
 
     fn from_word(word: &str) -> Option<Self> {
-        [Self::Ai, Self::Monitor, Self::Home, Self::Notifications].into_iter().find(|pod| pod.word() == word)
+        PODS.into_iter().find(|pod| pod.word() == word)
     }
 }
 
+// the wallpaper's surfaces with some of a colour mixed in, keeping their see-through
+fn tinted(colors: &[Color; 3], hue: Color, amount: f32) -> [Color; 3] {
+    colors.map(|color| Color::blend(color, Color::rgba(hue.red(), hue.green(), hue.blue(), color.alpha()), amount))
+}
+
 pub struct Pods {
     // the card open or closing, and the monitor it's on; `shown` whether it's opening or open
     card: Option<(Pod, String)>,
     shown: bool,
     timeline: Animation,
 
+    // a switch from one open card straight to another: the one before, and the switch's progress
+    previous: Option<Pod>,
+    switch: Animation,
+
     hover: HashMap<Pod, Animation>,
 
     // the pointer over the card, and a count every arrival and departure bumps, so a late close does nothing
@@ -93,7 +130,7 @@ pub struct Pods {
 
 impl Service for Pods {
     fn new() -> Self {
-        Self { card: None, shown: false, timeline: timeline(), hover: HashMap::new(), inside: false, moves: 0 }
+        Self { card: None, shown: false, timeline: timeline(), previous: None, switch: switching(1.0), hover: HashMap::new(), inside: false, moves: 0 }
     }
 
     // changes only through input
@@ -104,15 +141,34 @@ fn timeline() -> Animation {
     Animation::new(0.0).duration(Duration::from_millis(layout::open_ms())).easing(Easing::Linear)
 }
 
+fn switching(from: f32) -> Animation {
+    Animation::new(from).duration(Duration::from_millis(layout::open_ms())).easing(Easing::InOut)
+}
+
 pub fn open(pod: Pod, monitor: &str) {
     island::collapse();
 
     let mut pods = Pods::write();
 
-    // another card, or this one on another monitor: it grows from its own pill
-    if pods.card.as_ref().is_none_or(|(open, on)| *open != pod || on != monitor) {
+    let open_here = pods.shown && pods.timeline.value() > 0.5;
+    let current = pods.card.as_ref().filter(|(_, on)| on == monitor).map(|(open, _)| *open);
+
+    match current {
+        Some(open) if open == pod => {}
+        // another card while one is open here: the open one turns into it
+        Some(open) if open_here => {
+            pods.previous = Some(open);
+            pods.switch = switching(0.0);
+            pods.switch.to(1.0);
+            pods.card = Some((pod, monitor.to_string()));
+        }
+        // another card, or one on another monitor: it grows from its own pill
+        _ => {
             pods.card = Some((pod, monitor.to_string()));
             pods.timeline = timeline();
+            pods.previous = None;
+            pods.switch = switching(1.0);
+        }
     }
 
     pods.shown = true;
@@ -152,6 +208,20 @@ pub fn open_card() -> Option<Pod> {
     pods.card.as_ref().filter(|_| pods.shown).map(|(pod, _)| *pod)
 }
 
+/*
+ * whether this window draws the island's pill on `monitor` now: a little past the start
+ * of opening and until a little before the end of closing. this window draws it from
+ * the first frame to the last, so the two overlap at each hand-over, at the same place
+ */
+pub fn holds_island(monitor: &str) -> bool {
+    let pods = Pods::read();
+
+    pods.card.as_ref().is_some_and(|(_, on)| on == monitor) && pods.timeline.value() > HAND_OVER
+}
+
+// a share of the open timeline (420 ms by default: 0.08 is about two frames)
+const HAND_OVER: f32 = 0.08;
+
 fn hovering(pod: Pod) -> impl Fn(bool) + 'static {
     move |inside| {
         edge::over_bar(inside);
@@ -195,138 +265,334 @@ fn over_card(inside: bool) {
     });
 }
 
-pub fn left(monitor: &Monitor) -> LayerWindow {
-    side(monitor, true)
+// the island's pill in the carousel: the card closes back into place, then the island opens
+fn island_tapped(monitor: String) {
+    close();
+
+    thread::spawn(move || {
+        thread::sleep(Duration::from_millis(layout::open_ms()));
+
+        island::tap(&monitor);
+    });
 }
 
-pub fn right(monitor: &Monitor) -> LayerWindow {
-    side(monitor, false)
+// an item's width in the carousel
+fn item_width(item: Item) -> f32 {
+    match item {
+        Item::Pod(_) => island_pill::height(),
+        // beside an open card the island's pill shrinks to its cover or its bars
+        Item::Island => island::small_width(),
+    }
 }
 
-fn side(monitor: &Monitor, left: bool) -> LayerWindow {
+// an item's left edge in the row with nothing open, around the island as wide as it is now
+fn closed_x(item: Item, middle: f32, island_w: f32) -> f32 {
+    let (h, spacing, gap) = (island_pill::height(), layout::spacing(), layout::gap());
+
+    match item {
+        Item::Island => middle - island_pill::width() / 2.0,
+        Item::Pod(Pod::Monitor) => middle - island_w / 2.0 - gap - h,
+        Item::Pod(Pod::Ai) => middle - island_w / 2.0 - gap - 2.0 * h - spacing,
+        Item::Pod(Pod::Home) => middle + island_w / 2.0 + gap,
+        Item::Pod(Pod::Notifications) => middle + island_w / 2.0 + gap + h + spacing,
+    }
+}
+
+fn index(item: Item) -> usize {
+    ROW.iter().position(|other| *other == item).unwrap_or(0)
+}
+
+/*
+ * the two items on each side of `open`'s card: the other four in the row's order, the
+ * first two on its left and the last two on its right, so the left-most stays left-most
+ * (around Home: AI and System on its left, the island and the bell on its right; around
+ * AI: System and the island on its left, Home and the bell on its right)
+ */
+fn beside(open: Pod) -> ([Item; 2], [Item; 2]) {
+    let others: Vec<Item> = ROW.into_iter().filter(|item| *item != Item::Pod(open)).collect();
+
+    ([others[0], others[1]], [others[2], others[3]])
+}
+
+// an item's left edge in the carousel around `open`'s card, `card_w` wide, in the middle, and its side of the card (-1, 0 for the card's own, 1)
+fn carousel(item: Item, open: Pod, card_w: f32, middle: f32) -> (f32, i8) {
+    // the card's own pill, while it fades into the card or out of it, sits in the card's middle
+    if item == Item::Pod(open) {
+        return (middle - item_width(item) / 2.0, 0);
+    }
+
+    let (spacing, gap) = (layout::spacing(), layout::gap());
+    let (left, right) = beside(open);
+
+    match left.iter().position(|other| *other == item) {
+        // leftwards from the card, past the one between
+        Some(k) => {
+            let between: f32 = left[k + 1..].iter().map(|other| item_width(*other) + spacing).sum();
+
+            (middle - card_w / 2.0 - gap - between - item_width(item), -1)
+        }
+        None => {
+            let k = right.iter().position(|other| *other == item).unwrap_or(0);
+            let between: f32 = right[..k].iter().map(|other| item_width(*other) + spacing).sum();
+
+            (middle + card_w / 2.0 + gap + between, 1)
+        }
+    }
+}
+
+/*
+ * an item's side of the middle in the closed row, where every card opens: AI and System
+ * left, the island in it (0, so it slides out to whichever side it goes), Home and the
+ * bell right. no item changes sides on opening, so none crosses the card
+ */
+fn closed_side(item: Item) -> i8 {
+    (index(item) as i8 - index(Item::Island) as i8).signum()
+}
+
+/*
+ * from one place to another by `k`, with how much it shows: sliding when it stays on its
+ * side of the card; changing sides it fades out where it is over the first half and in at
+ * its new place over the second, so it never crosses the card
+ */
+fn travel(from: (f32, i8), to: (f32, i8), k: f32) -> (f32, f32) {
+    if from.1 == to.1 || from.1 == 0 || to.1 == 0 {
+        (mix(from.0, to.0, k), 1.0)
+    } else if k < 0.5 {
+        (from.0, 1.0 - 2.0 * k)
+    } else {
+        (to.0, 2.0 * k - 1.0)
+    }
+}
+
+// what both windows need to know about this monitor's card this frame
+struct Scene {
+    // the pod and its timeline, while it's at all open here
+    card: Option<(Pod, f32)>,
+    grow: f32,
+    pill_shown: f32,
+    reveal: f32,
+    switch: f32,
+    previous: Option<Pod>,
+    middle: f32,
+    island_w: f32,
+    // the row's move into the carousel: it starts only after the hand-over (see holds_island), so the island's pill never shows twice
+    row_grow: f32,
+}
+
+fn scene(state: &Pods, monitor: &Monitor) -> Scene {
+    let here = monitor.name.as_str();
+    let card = state.card.as_ref().filter(|(_, on)| on == here).map(|(pod, _)| (*pod, state.timeline.value())).filter(|(_, t)| *t > 0.0);
+    let (grow, pill_shown, reveal) = card.map_or((0.0, 1.0, 0.0), |(_, t)| phases(t));
+
+    // read only here: a running animation redraws every window that reads it
+    let switch = if card.is_some() { state.switch.value() } else { 1.0 };
+    let previous = state.previous.filter(|_| switch < 1.0 && card.is_some());
+
+    let row_grow = card.map_or(0.0, |(_, t)| phases(((t - 2.0 * HAND_OVER) / (1.0 - 2.0 * HAND_OVER)).max(0.0)).0);
+
+    Scene { card, grow, pill_shown, reveal, switch, previous, middle: monitor.width as f32 / 2.0, island_w: island::width_on(here), row_grow }
+}
+
+impl Scene {
+    // an item's left edge on the monitor and how much it shows: between the closed row and the carousel by `row_grow`, between two carousels by `switch`
+    fn place(&self, item: Item) -> (f32, f32) {
+        let closed = closed_x(item, self.middle, self.island_w);
+
+        let Some((open, _)) = self.card else { return (closed, 1.0) };
+
+        let now = carousel(item, open, open.size().0, self.middle);
+
+        let (open_x, open_shown, open_side) = match self.previous {
+            Some(before) => {
+                let from = carousel(item, before, before.size().0, self.middle);
+                let (x, shown) = travel(from, now, self.switch);
+
+                (x, shown, if self.switch < 0.5 { from.1 } else { now.1 })
+            }
+            None => (now.0, 1.0, now.1),
+        };
+
+        let (x, shown) = travel((closed, closed_side(item)), (open_x, open_side), self.row_grow);
+
+        (x, shown * open_shown)
+    }
+}
+
+/*
+ * the row of pills: as wide as the monitor and as tall as a pill, never changing. amane
+ * repaints a whole window every frame and hyprland then recomposites (and re-blurs)
+ * everything under it, so a window as tall as the cards ran the animations at 15 fps;
+ * the cards have their own window (card_view)
+ */
+pub fn row_view(monitor: &Monitor) -> LayerWindow {
     theme::begin();
 
     let here = monitor.name.as_str();
-    let pods = if left { LEFT } else { RIGHT };
-    let colors = theme::now().surfaces();
-
+    let wallpaper = theme::now().surfaces();
     let state = Pods::read();
+    let scene = scene(&state, monitor);
+    let (h, top, shadow) = (island_pill::height(), island_pill::top_gap(), island_pill::shadow());
 
-    // this side's card on this monitor, while it's at all open
-    let card = state.card.as_ref().filter(|(pod, on)| pod.left() == left && on == here).map(|(pod, _)| (*pod, state.timeline.value())).filter(|(_, t)| *t > 0.0);
-
-    // with the bar on a fullscreen monitor, unless its card is open; out of the island's way while it opens
-    let slide = if card.is_some() { 0.0 } else { edge::hidden_by(Edge::read().shown(here), 0.0, edge::hide_h()) };
-    let shift = (island::width_on(here) - island_pill::width()) / 2.0;
-
-    let (h, top, shadow, spacing) = (island_pill::height(), island_pill::top_gap(), island_pill::shadow(), layout::spacing());
-    let count = pods.len() as f32;
-    let group_w = count * h + (count - 1.0) * spacing;
-
-    let (card_w, card_h) = card.map_or((0.0, 0.0), |(pod, _)| pod.size());
-
-    /*
-     * room for the pills to move away from the open island, or for this side's widest
-     * card. the width never follows the open card: a narrower window would move with
-     * its margin, and Hyprland applies size and position on different frames, so the
-     * pills jumped when a card closed
-     */
-    let room = (island_card::width() - island_pill::width()) / 2.0;
-    let widest = pods.iter().map(|pod| pod.size().0).fold(0.0, f32::max);
-    let inner_w = (group_w + room).max(widest);
-    let window_h = top + h.max(card_h) + shadow;
-
-    // the group's edge nearest the island, in the window, and where the window starts on the monitor
-    let near = if left { shadow + inner_w } else { shadow };
-    let middle = monitor.width as f32 / 2.0;
-    let beside = island_pill::width() / 2.0 + layout::gap();
-    let start = if left { middle - beside - near } else { middle + beside - near };
+    // with the bar on a fullscreen monitor, unless a card is open
+    let slide = if scene.card.is_some() { 0.0 } else { edge::hidden_by(Edge::read().shown(here), 0.0, edge::hide_h()) };
 
     let window = LayerWindow::new()
-        .width(inner_w + 2.0 * shadow)
-        .height(window_h)
+        .width(monitor.width as f32)
+        .height(top + h + shadow)
         .anchor_vertical(Vertical::Top)
         .anchor_horizontal(Horizontal::Left)
-        .margin(Margin { top: 0, right: 0, bottom: 0, left: start.round() as i32 })
+        .margin(Margin { top: 0, right: 0, bottom: 0, left: 0 })
         .layer(Layer::Overlay)
         .space(Zone::Ignore)
-        .namespace(if left { "magic-pods-left" } else { "magic-pods-right" });
+        .namespace("magic-pods");
 
     // empty and click-through rather than hidden: see the island's view for why
     if slide <= -edge::hide_h() {
         return window.click_through().child(Rectangle::new().width(0.0).height(0.0));
     }
 
-    // a pill's left edge in the window; `k` counts from the island outwards
-    let pill_x = |pod: Pod| {
-        let at = pods.iter().position(|other| *other == pod).unwrap_or(0) as f32;
-        let k = if left { count - 1.0 - at } else { at };
-
-        if left { near - shift - (k + 1.0) * h - k * spacing } else { near + shift + k * (h + spacing) }
-    };
-
-    let (grow, pill_shown, reveal) = card.map_or((0.0, 1.0, 0.0), |(_, t)| phases(t));
-
-    /*
-     * the pills beside an open card are gone; a closing card shrinks back into its own
-     * pill's place, and they come back behind it only over the last `reveal_at` of its
-     * shrinking, so they don't pop up around a big card
-     */
-    let reveal_at = layout::reveal_at();
-    let others = if grow <= 0.0 {
-        1.0
-    } else if reveal_at <= 0.0 {
-        0.0
-    } else {
-        let k = (1.0 - grow / reveal_at).clamp(0.0, 1.0);
-
-        k * k * (3.0 - 2.0 * k)
-    };
+    let (card, previous, switch) = (scene.card, scene.previous, scene.switch);
 
     let mut layers: Vec<Box<dyn Widget>> = Vec::new();
     let mut regions: Vec<InputArea> = Vec::new();
 
-    for pod in pods {
-        // the open one is the card, drawn last, over the others
-        if card.is_some_and(|(open, _)| open == pod) || others <= 0.0 {
+    for item in ROW {
+        let (x, seen) = scene.place(item);
+
+        if seen <= 0.0 {
+            continue;
+        }
+
+        match item {
+            Item::Island => {
+                // the island's own window draws its pill while nothing is open here
+                if card.is_none() {
+                    continue;
+                }
+
+                // it shrinks to its cover (or its bars) as it moves aside
+                let small = scene.row_grow;
+                let width = mix(island_pill::width(), island::small_width(), small);
+                let on = here.to_string();
+                let pill = island::pill_face(here, small).cursor(Pointer).on_hover(edge::over_bar).on_click(move |_| island_tapped(on.clone()));
+                let pill = if seen < 1.0 { pill.opacity(seen) } else { pill };
+
+                regions.push(InputArea { x: x as i32, y: top as i32, width: width.ceil() as i32, height: h.ceil() as i32 });
+                layers.push(Box::new(pill.translate(x, top)));
+            }
+            Item::Pod(pod) => {
+                // the open one is the card, drawn last. in a switch, the one switched to slides into
+                // the card and fades over the first half; the one switched away from fades back in as a pill
+                let shown = match previous {
+                    Some(_) if card.is_some_and(|(open, _)| open == pod) => 1.0 - 2.0 * switch,
+                    // its card is in the card window, which starts drawing at HAND_OVER; the pill stays a little longer under it
+                    _ if card.is_some_and(|(open, t)| open == pod && t > 2.0 * HAND_OVER) => continue,
+                    Some(before) if before == pod => switch,
+                    _ => 1.0,
+                } * seen;
+
+                if shown <= 0.0 {
                     continue;
                 }
 
-        let x = pill_x(pod);
                 let lit = state.hover.get(&pod).map_or(0.0, Animation::value);
-        let pill = pill(pod, lit, &colors, here);
-        let pill = if others < 1.0 { pill.opacity(others) } else { pill };
+                let pill = pill(pod, lit, &wallpaper, here);
+                let pill = if shown < 1.0 { pill.opacity(shown) } else { pill };
 
                 regions.push(InputArea { x: x as i32, y: (top + slide) as i32, width: h.ceil() as i32, height: h.ceil() as i32 });
                 layers.push(Box::new(pill.translate(x, top + slide)));
             }
+        }
+    }
 
-    let typing = card.is_some_and(|(pod, _)| pod.types() && state.shown);
+    window.input_region(regions).child(Rectangle::new().width(Parent).height(Parent).child(Stack::new(layers).width(Parent).height(Parent)))
+}
 
-    if let Some((pod, _)) = card {
-        // from the pill to the card, its edge nearest the island staying put
-        let from_x = pill_x(pod);
-        let to_x = if left { near - shift - card_w } else { near + shift };
+/*
+ * the open card, in the middle: a window as big as the biggest card while one is open
+ * here, and an empty pixel otherwise. it changes size only while it shows nothing (the
+ * card starts and ends as its pill, which the row window draws under it meanwhile), so
+ * hyprland's squashed first frame at a new size is never seen
+ */
+pub fn card_view(monitor: &Monitor) -> LayerWindow {
+    theme::begin();
 
-        let width = mix(h, card_w, grow);
-        let height = mix(h, card_h, grow);
+    let wallpaper = theme::now().surfaces();
+    let state = Pods::read();
+    let scene = scene(&state, monitor);
+    let (h, top, shadow) = (island_pill::height(), island_pill::top_gap(), island_pill::shadow());
+
+    let window = |width: f32, height: f32| LayerWindow::new().width(width).height(height).anchor_vertical(Vertical::Top).layer(Layer::Overlay).space(Zone::Ignore).namespace("magic-pods-card");
+
+    let Some((pod, t)) = scene.card else {
+        return window(1.0, 1.0).click_through().child(Rectangle::new().width(0.0).height(0.0));
+    };
+
+    let widest = PODS.iter().map(|pod| pod.size().0).fold(h, f32::max);
+    let tallest = [settings::ai::height(), stats::tallest(), home::height(), history::height()].into_iter().fold(h, f32::max);
+    let window_w = (widest + 2.0 * shadow).round();
+
+    // centred by hyprland: its left edge on the monitor
+    let left = ((monitor.width as f32 - window_w) / 2.0).floor();
+    let window = window(window_w, top + tallest + shadow);
+
+    // the first frames at the new size show at the old place, so they stay empty (the row draws the pill meanwhile)
+    if t <= HAND_OVER {
+        return window.click_through().child(Rectangle::new().width(0.0).height(0.0));
+    }
+
+    let (grow, pill_shown, reveal, switch, previous, middle) = (scene.grow, scene.pill_shown, scene.reveal, scene.switch, scene.previous, scene.middle);
+
+    let mut layers: Vec<Box<dyn Widget>> = Vec::new();
+    let mut regions: Vec<InputArea> = Vec::new();
+
+    let typing = pod.types() && state.shown;
+
+    {
+        let (card_w, card_h) = pod.size();
+
+        // a switch morphs the card from the one before: its size, its colour, and its face crossing over
+        let (full_w, full_h, hue) = match previous {
+            Some(before) => {
+                let (before_w, before_h) = before.size();
+
+                (mix(before_w, card_w, switch), mix(before_h, card_h, switch), Color::blend(before.hue(), pod.hue(), switch))
+            }
+            None => (card_w, card_h, pod.hue()),
+        };
+
+        // from its pill's place in the closed row to the middle, and back into that place; in the window
+        let from_x = closed_x(Item::Pod(pod), middle, scene.island_w) - left;
+        let to_x = middle - full_w / 2.0 - left;
+
+        let width = mix(h, full_w, grow);
+        let height = mix(h, full_h, grow);
         let x = mix(from_x, to_x, grow);
         let radius = mix(h / 2.0, layout::radius(), grow);
         let lit = state.hover.get(&pod).map_or(0.0, Animation::value);
+        let colors = tinted(&wallpaper, hue, mix(hues::pill_mix(), hues::card_mix(), grow));
 
-        let face: Rectangle = if reveal > 0.0 {
-            veiled(content(pod, card_w, card_h), width, height, radius, reveal, &colors)
-        } else {
+        let face: Rectangle = match previous {
+            // the card before fades out over the first half of the switch, this one in over the second
+            Some(before) if switch < 0.5 => {
+                let (before_w, before_h) = before.size();
+
+                veiled(content(before, before_w, before_h), width, height, radius, 1.0 - 2.0 * switch, &colors)
+            }
+            Some(_) => veiled(content(pod, card_w, card_h), width, height, radius, 2.0 * switch - 1.0, &colors),
+            None if reveal > 0.0 => veiled(content(pod, card_w, card_h), width, height, radius, reveal, &colors),
+            None => {
                 // the pill's icon fading as the shape grows
-            let tint = Color::blend(CLEAR, theme::now().text, pill_shown);
+                let tint = Color::blend(CLEAR, pod.hue(), pill_shown);
 
                 Rectangle::new().width(h).height(h).align_child(Center, Center).child(icon(pod.glyph(), layout::icon(), tint))
+            }
         };
 
-        let face = Rectangle::new().width(width).height(height).align_child(Start, Start).child(face);
-        let shape = surface::shell(width, height, radius, &colors, lit * pill_shown, face).on_hover(over_card).translate(x, top + slide);
+        let face = Rectangle::new().width(width).height(height).align_child(Center, Start).child(face);
+        let shape = surface::shell(width, height, radius, &colors, lit * pill_shown, face).on_hover(over_card).translate(x, top);
 
-        regions.push(InputArea { x: x as i32, y: (top + slide) as i32, width: width.ceil() as i32, height: height.ceil() as i32 });
+        regions.push(InputArea { x: x as i32, y: top as i32, width: width.ceil() as i32, height: height.ceil() as i32 });
         layers.push(Box::new(shape));
     }
 
@@ -346,12 +612,14 @@ fn side(monitor: &Monitor, left: bool) -> LayerWindow {
     window.child(Rectangle::new().width(Parent).height(Parent).child(Stack::new(layers).width(Parent).height(Parent)))
 }
 
-// a small pill: the surface with one icon; the bell carries the unread count
-fn pill(pod: Pod, lit: f32, colors: &[Color; 3], monitor: &str) -> Rectangle {
+// a small pill in its own colour: the surface with one icon; the bell carries the unread count
+fn pill(pod: Pod, lit: f32, wallpaper: &[Color; 3], monitor: &str) -> Rectangle {
     let h = island_pill::height();
     let theme = theme::now();
+    let hue = pod.hue();
+    let colors = tinted(wallpaper, hue, hues::pill_mix());
 
-    let glyph = icon(pod.glyph(), layout::icon() * (1.0 + 0.08 * lit), Color::blend(theme.dim, theme.text, 0.6 + 0.4 * lit));
+    let glyph = icon(pod.glyph(), layout::icon() * (1.0 + 0.08 * lit), Color::blend(hue, theme.text, 0.25 + 0.5 * lit));
     let mut inside: Vec<Box<dyn Widget>> = vec![Box::new(Rectangle::new().width(h).height(h).align_child(Center, Center).child(glyph))];
 
     let unread = if pod == Pod::Notifications { notices::unread() } else { 0 };
@@ -365,7 +633,7 @@ fn pill(pod: Pod, lit: f32, colors: &[Color; 3], monitor: &str) -> Rectangle {
                 .width(badge)
                 .height(badge)
                 .radius(Full)
-                .fill(theme.accent)
+                .fill(hue)
                 .align_child(Center, Center)
                 .translate(h - badge - 3.0, 3.0)
                 .child(Text::new(words).size(text::tiny() - 1.0).weight(Weight::Bold).color(theme.on_accent)),
@@ -375,7 +643,7 @@ fn pill(pod: Pod, lit: f32, colors: &[Color; 3], monitor: &str) -> Rectangle {
     let content = Rectangle::new().width(h).height(h).child(Stack::new(inside).width(h).height(h));
     let on = monitor.to_string();
 
-    surface::shell(h, h, h / 2.0, colors, lit, content).cursor(Pointer).on_hover(hovering(pod)).on_click(move |_| toggle(pod, &on))
+    surface::shell(h, h, h / 2.0, &colors, lit, content).cursor(Pointer).on_hover(hovering(pod)).on_click(move |_| toggle(pod, &on))
 }
 
 fn content(pod: Pod, width: f32, height: f32) -> Rectangle {
@@ -494,9 +762,9 @@ pub fn command(arguments: &[String]) -> String {
             let card = pods.card.as_ref().filter(|_| pods.shown).map_or("none", |(pod, _)| pod.word());
             let on = pods.card.as_ref().map_or("", |(_, on)| on.as_str());
 
-            format!("card={card} monitor={on} timeline={:.2} unread={}", pods.timeline.value(), notices::unread())
+            format!("card={card} monitor={on} timeline={:.2} switch={:.2} unread={}", pods.timeline.value(), pods.switch.value(), notices::unread())
         }
-        _ => String::from("usage: pods open|toggle <ai|monitor|home|notifications> [monitor] | close | ask <question> | notices list|dismiss <id>|clear | status"),
+        _ => String::from("usage: pods open|toggle <ai|monitor|home|notifications> [monitor] | close | ask <question> | processes | notices list|dismiss <id>|clear | status"),
     }
 }
 
@@ -504,4 +772,3 @@ pub fn command(arguments: &[String]) -> String {
 pub fn rule(width: f32) -> Rectangle {
     Rectangle::new().width(width).height(1.0).fill(overlays::track())
 }
-

src/stats.rs

@@ -293,6 +293,14 @@ pub fn height() -> f32 {
     2.0 * layout::pad() + pods::header_height() + graphs + egpu + 1.0 + label_height() + temp_rows() as f32 * temp_row_height() + (parts - 1.0) * 10.0
 }
 
+// the card's height at its tallest: an external gpu with its whole list of programs
+pub fn tallest() -> f32 {
+    let graphs = 7.0 * (label_height() + settings::graph_height()) + 6.0 * 10.0;
+    let egpu = (1 + settings::programs()) as f32 * program_row_height();
+
+    2.0 * layout::pad() + pods::header_height() + graphs + egpu + 1.0 + label_height() + temp_rows() as f32 * temp_row_height() + 5.0 * 10.0
+}
+
 // bytes a second in words
 fn rate(bytes: f32) -> String {
     match bytes {