lookout: package the Outlook-alike GNOME mail client

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

apps/lookout.nix

@@ -0,0 +1,53 @@
+#./apps/lookout.nix
+{ pkgs, lib, config, ... }:
+let
+  lookout = pkgs.rustPlatform.buildRustPackage (finalAttrs: {
+    pname = "lookout";
+    version = "0.9.99";
+
+    src = pkgs.fetchFromGitHub {
+      owner = "gavindi";
+      repo = "lookout";
+      tag = finalAttrs.version;
+      hash = "sha256-X0m5f/Kk8Uf4e330vY/E5OHb8i5O/JI0zLGWqYS2BzE=";
+    };
+
+    # Cargo workspace lives in source/, data/ next to it.
+    sourceRoot = "${finalAttrs.src.name}/source";
+    cargoHash = "sha256-6f9aNjvDcdpxxkGbxBDrEB94YZikpc3bNtYex0EREXE=";
+
+    # The app crate's tests instantiate GTK widgets, which needs a display.
+    doCheck = false;
+
+    nativeBuildInputs = with pkgs; [ pkg-config glib wrapGAppsHook4 ];
+    buildInputs = with pkgs; [ gtk4 libadwaita webkitgtk_6_0 ];
+
+    postInstall = ''
+      install -Dm644 data/io.github.gavindi.Lookout.desktop -t $out/share/applications
+      install -Dm644 data/io.github.gavindi.Lookout.metainfo.xml -t $out/share/metainfo
+      install -Dm644 data/icons/hicolor/scalable/apps/io.github.gavindi.Lookout.svg \
+        -t $out/share/icons/hicolor/scalable/apps
+      install -Dm644 data/gschema/io.github.gavindi.Lookout.gschema.xml \
+        -t $out/share/glib-2.0/schemas
+    '';
+
+    meta = {
+      description = "Native GNOME mail, calendar and contacts client shaped like Outlook";
+      homepage = "https://github.com/gavindi/lookout";
+      license = lib.licenses.gpl3Plus;
+      mainProgram = "lookout";
+      platforms = lib.platforms.linux;
+    };
+  });
+in
+{
+  config = lib.mkIf (lib.elem config.networking.hostName [ "FredOS-Gaming" "FredOS-Macbook" ]) {
+    environment.systemPackages = [
+      lookout
+      # Lookout reads accounts from GOA over D-Bus; nothing on Hyprland can add
+      # one without this settings panel.
+      pkgs.gnome-online-accounts-gtk
+    ];
+    services.gnome.gnome-online-accounts.enable = true;
+  };
+}

common.nix

@@ -89,6 +89,7 @@ in
     ./settings/users.nix
     ./settings/shell.nix
     ./apps/zen.nix
+    ./apps/lookout.nix
 
     # Services #
     ./services/server-permissions.nix