feat(appd): add QueryInstalledApps IPC request; wire launcher in system UI

crates/weft-appd/Cargo.toml

@@ -11,6 +11,7 @@ path = "src/main.rs"
 [dependencies]
 anyhow = "1.0"
 sd-notify = "0.4"
+toml = "0.8"
 tokio = { version = "1", features = ["rt-multi-thread", "macros", "net", "io-util", "signal", "sync", "process", "time"] }
 serde = { version = "1", features = ["derive"] }
 rmp-serde = "1"

crates/weft-appd/src/ipc.rs

@@ -8,6 +8,7 @@ pub enum Request {
     TerminateApp { session_id: u64 },
     QueryRunning,
     QueryAppState { session_id: u64 },
+    QueryInstalledApps,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -16,6 +17,12 @@ pub struct SessionInfo {
     pub app_id: String,
 }
 
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct AppInfo {
+    pub app_id: String,
+    pub name: String,
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(tag = "type", rename_all = "SCREAMING_SNAKE_CASE")]
 pub enum Response {
@@ -34,6 +41,9 @@ pub enum Response {
         session_id: u64,
         state: AppStateKind,
     },
+    InstalledApps {
+        apps: Vec<AppInfo>,
+    },
     Error {
         code: u32,
         message: String,

crates/weft-appd/src/main.rs

@@ -9,7 +9,7 @@ mod ipc;
 mod runtime;
 mod ws;
 
-use ipc::{AppStateKind, Request, Response, SessionInfo};
+use ipc::{AppInfo, AppStateKind, Request, Response, SessionInfo};
 
 pub(crate) type Registry = Arc<Mutex<SessionRegistry>>;
 
@@ -254,8 +254,67 @@ pub(crate) async fn dispatch(req: Request, registry: &Registry) -> Response {
             let state = registry.lock().await.state(session_id);
             Response::AppState { session_id, state }
         }
+        Request::QueryInstalledApps => {
+            let apps = scan_installed_apps();
+            Response::InstalledApps { apps }
         }
     }
+}
+
+fn app_store_roots() -> Vec<std::path::PathBuf> {
+    if let Ok(explicit) = std::env::var("WEFT_APP_STORE") {
+        return vec![std::path::PathBuf::from(explicit)];
+    }
+    let mut roots = Vec::new();
+    if let Ok(home) = std::env::var("HOME") {
+        roots.push(
+            std::path::PathBuf::from(home)
+                .join(".local")
+                .join("share")
+                .join("weft")
+                .join("apps"),
+        );
+    }
+    roots.push(std::path::PathBuf::from("/usr/share/weft/apps"));
+    roots
+}
+
+#[derive(serde::Deserialize)]
+struct WappPackage {
+    id: String,
+    name: String,
+}
+
+#[derive(serde::Deserialize)]
+struct WappManifest {
+    package: WappPackage,
+}
+
+fn scan_installed_apps() -> Vec<AppInfo> {
+    let mut seen = std::collections::HashSet::new();
+    let mut apps = Vec::new();
+    for root in app_store_roots() {
+        let Ok(entries) = std::fs::read_dir(&root) else {
+            continue;
+        };
+        for entry in entries.flatten() {
+            let manifest_path = entry.path().join("wapp.toml");
+            let Ok(contents) = std::fs::read_to_string(&manifest_path) else {
+                continue;
+            };
+            let Ok(m) = toml::from_str::<WappManifest>(&contents) else {
+                continue;
+            };
+            if seen.insert(m.package.id.clone()) {
+                apps.push(AppInfo {
+                    app_id: m.package.id,
+                    name: m.package.name,
+                });
+            }
+        }
+    }
+    apps
+}
 
 fn appd_socket_path() -> anyhow::Result<PathBuf> {
     if let Ok(p) = std::env::var("WEFT_APPD_SOCKET") {
@@ -432,6 +491,36 @@ mod tests {
         assert!(matches!(reg.state(42), AppStateKind::NotFound));
     }
 
+    #[test]
+    fn scan_installed_apps_finds_valid_packages() {
+        use std::fs;
+        let store = std::env::temp_dir().join(format!("weft_appd_scan_{}", std::process::id()));
+        let app_dir = store.join("com.example.scanner");
+        fs::create_dir_all(&app_dir).unwrap();
+        fs::write(
+            app_dir.join("wapp.toml"),
+            "[package]\nid = \"com.example.scanner\"\nname = \"Scanner\"\nversion = \"1.0.0\"\n\
+             [runtime]\nmodule = \"app.wasm\"\n[ui]\nentry = \"ui/index.html\"\n",
+        )
+        .unwrap();
+
+        let prior = std::env::var("WEFT_APP_STORE").ok();
+        unsafe { std::env::set_var("WEFT_APP_STORE", &store) };
+
+        let apps = scan_installed_apps();
+        assert_eq!(apps.len(), 1);
+        assert_eq!(apps[0].app_id, "com.example.scanner");
+        assert_eq!(apps[0].name, "Scanner");
+
+        unsafe {
+            match prior {
+                Some(v) => std::env::set_var("WEFT_APP_STORE", v),
+                None => std::env::remove_var("WEFT_APP_STORE"),
+            }
+        }
+        let _ = fs::remove_dir_all(&store);
+    }
+
     #[cfg(unix)]
     #[tokio::test(flavor = "current_thread")]
     async fn supervisor_transitions_through_ready_to_stopped() {

infra/shell/system-ui.html

@@ -94,12 +94,45 @@
       backdrop-filter: blur(32px);
       -webkit-backdrop-filter: blur(32px);
       z-index: 100;
+      padding: 24px;
+      overflow-y: auto;
     }
 
     weft-launcher:not([hidden]) {
       display: block;
     }
 
+    weft-app-grid {
+      display: grid;
+      grid-template-columns: repeat(auto-fill, minmax(96px, 1fr));
+      gap: 16px;
+      max-width: 640px;
+      margin: 0 auto;
+    }
+
+    weft-app-icon {
+      display: flex;
+      flex-direction: column;
+      align-items: center;
+      gap: 6px;
+      padding: 12px 8px;
+      border-radius: 12px;
+      cursor: pointer;
+      color: var(--text-primary);
+      font-size: 12px;
+      text-align: center;
+      word-break: break-word;
+      transition: background 0.15s;
+    }
+
+    weft-app-icon:hover {
+      background: var(--surface-border);
+    }
+
+    weft-app-icon svg {
+      flex-shrink: 0;
+    }
+
     weft-notification-center {
       position: fixed;
       top: 8px;
@@ -138,7 +171,9 @@
     </weft-taskbar>
   </weft-desktop>
 
-  <weft-launcher hidden id="launcher"></weft-launcher>
+  <weft-launcher hidden id="launcher">
+    <weft-app-grid id="app-grid"></weft-app-grid>
+  </weft-launcher>
   <weft-notification-center id="notifications"></weft-notification-center>
 
   <script>
@@ -177,6 +212,7 @@
         ws.addEventListener('open', function () {
           wsReconnectDelay = 1000;
           ws.send(JSON.stringify({ type: 'QUERY_RUNNING' }));
+          ws.send(JSON.stringify({ type: 'QUERY_INSTALLED_APPS' }));
         });
 
         ws.addEventListener('message', function (ev) {
@@ -201,7 +237,9 @@
       }
 
       function handleAppdMessage(msg) {
-        if (msg.type === 'APP_READY') {
+        if (msg.type === 'INSTALLED_APPS') {
+          renderLauncher(msg.apps || []);
+        } else if (msg.type === 'APP_READY') {
           var label = msg.app_id ? msg.app_id.split('.').pop() : String(msg.session_id);
           showNotification(label + ' is ready');
         } else if (msg.type === 'APP_STATE') {
@@ -217,6 +255,38 @@
         }
       }
 
+      function renderLauncher(apps) {
+        var grid = document.getElementById('app-grid');
+        grid.innerHTML = '';
+        if (apps.length === 0) {
+          var empty = document.createElement('p');
+          empty.textContent = 'No apps installed';
+          empty.style.cssText = 'color:var(--text-secondary);font-size:13px;';
+          grid.appendChild(empty);
+          return;
+        }
+        apps.forEach(function (app) {
+          var icon = document.createElement('weft-app-icon');
+          icon.dataset.appId = app.app_id;
+          icon.title = app.app_id;
+          icon.innerHTML =
+            '<svg width="40" height="40" viewBox="0 0 40 40" fill="none"' +
+            ' xmlns="http://www.w3.org/2000/svg" aria-hidden="true">' +
+            '<rect width="40" height="40" rx="10" fill="rgba(91,138,245,0.25)"/>' +
+            '<text x="20" y="27" text-anchor="middle" font-size="18" fill="rgba(255,255,255,0.8)">' +
+            (app.name ? app.name.charAt(0).toUpperCase() : '?') +
+            '</text></svg>' +
+            '<span>' + (app.name || app.app_id) + '</span>';
+          icon.addEventListener('click', function () {
+            if (ws && ws.readyState === WebSocket.OPEN) {
+              ws.send(JSON.stringify({ type: 'LAUNCH_APP', app_id: app.app_id, surface_id: 0 }));
+            }
+            document.getElementById('launcher').setAttribute('hidden', '');
+          });
+          grid.appendChild(icon);
+        });
+      }
+
       function ensureTaskbarEntry(sessionId, appId) {
         var id = 'task-' + sessionId;
         if (document.getElementById(id)) { return; }