feat(k-ui): text_input (label above, app owns text via on_change, caret, erase, submit, secret, placeholder); keys Left/Right/Space/Char/Erase; settings app filter; apps 8-page stack (k-ui overflowed 16K), args page -> 0x1000

crates/apps/settings/src/main.rs

@@ -14,7 +14,7 @@ extern crate libkos;
 use alloc::format;
 use alloc::string::{String, ToString};
 use alloc::vec::Vec;
-use k_ui::{App, ButtonVariant, Element, Spacing, TextColour, TextStyle, button, column, list_item, text, toggle};
+use k_ui::{App, ButtonVariant, Element, Spacing, TextColour, TextStyle, button, column, list_item, text, text_input, toggle};
 use libkos::apps::Apps;
 use libkos::session::Role;
 use manifest::{Capabilities, Capability};
@@ -34,11 +34,13 @@ enum Screen {
     About,
 }
 
-#[derive(Clone, Copy)]
+#[derive(Clone)]
 enum Event {
     Show(Screen),
     /// Allow or revoke this capability of the app on screen.
     Flip(Capability),
+    /// What the app list is narrowed to.
+    Filter(String),
     /// Use the display's `n`th theme.
     Theme(usize),
     SignOut,
@@ -56,6 +58,8 @@ struct Settings {
     screen: Screen,
     apps: Option<Apps>,
     rows: Vec<AppRow>,
+    /// Only apps whose name or id has this in it are listed.
+    filter: String,
     /// Who is signed in, and how.
     who: Option<(String, Role)>,
     /// The display's themes, and which is in use.
@@ -81,7 +85,8 @@ impl Settings {
     fn reload(&mut self) {
         self.rows.clear();
         let Some(apps) = &self.apps else { return };
-        let mut buf = [0u8; LISTING];
+        // On the heap: an app's stack is a few pages.
+        let mut buf = alloc::vec![0u8; LISTING];
         let Ok(n) = apps.apps(&mut buf) else {
             self.trouble = Some("The permission manager did not answer.".to_string());
             return;
@@ -141,12 +146,15 @@ impl Settings {
     }
 
     fn app_list(&self) -> Element<Event> {
-        let rows = self.rows.iter().enumerate().map(|(i, r)| {
+        let wanted = self.filter.to_ascii_lowercase();
+        let shown = |r: &&AppRow| r.name.to_ascii_lowercase().contains(&wanted) || r.id.contains(&wanted);
+        let rows = self.rows.iter().enumerate().filter(|(_, r)| shown(r)).map(|(i, r)| {
             let allowed = r.granted.intersect(r.requested).iter().count();
             let asked = r.requested.iter().count();
             list_item(r.name.clone(), Event::Show(Screen::App(i))).subtitle(format!("{}  ·  {} of {} allowed", r.id, allowed, asked))
         });
-        let view = Self::hint(Self::heading("Apps"), "Esc goes back").children(rows);
+        let find = text_input("Find an app", self.filter.clone(), Event::Filter).placeholder("Name or id");
+        let view = Self::hint(Self::heading("Apps"), "Esc goes back, Down goes to the list").child(find).children(rows);
         self.with_trouble(view).into()
     }
 
@@ -209,7 +217,7 @@ impl App for Settings {
                 .collect()
         });
         let theme = window.and_then(libkos::display::theme).map_or(0, |(i, _)| i);
-        let mut s = Settings { screen: Screen::Home, apps, rows: Vec::new(), who, themes, theme, trouble: None };
+        let mut s = Settings { screen: Screen::Home, apps, rows: Vec::new(), filter: String::new(), who, themes, theme, trouble: None };
         s.reload();
         s
     }
@@ -219,6 +227,7 @@ impl App for Settings {
             Event::Show(screen) => {
                 self.trouble = None;
                 if screen == Screen::Apps {
+                    self.filter.clear();
                     self.reload();
                 }
                 self.screen = screen;
@@ -228,6 +237,7 @@ impl App for Settings {
                     self.flip(i, cap);
                 }
             }
+            Event::Filter(f) => self.filter = f,
             Event::Theme(i) => self.choose_theme(i),
             Event::SignOut => {
                 if let Some(s) = libkos::start::session() {