app bundle

flake.nix

@@ -132,6 +132,35 @@
               unset slermCache slermStale slermTmp slermDir slermGlob slermLib
             fi
           '';
+          # macOS only gives a process a dock icon, a menu bar and a real
+          # application name when it runs from a bundle, so ship one and keep
+          # bin/slerm as a symlink into it for terminal use.
+          appBundle = version: ''
+            app="$out/Applications/slerm.app"
+            mkdir -p "$app/Contents/MacOS" "$app/Contents/Resources"
+            cat > "$app/Contents/Info.plist" <<EOF
+            <?xml version="1.0" encoding="UTF-8"?>
+            <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+            <plist version="1.0">
+            <dict>
+              <key>CFBundleName</key><string>slerm</string>
+              <key>CFBundleDisplayName</key><string>slerm</string>
+              <key>CFBundleExecutable</key><string>slerm</string>
+              <key>CFBundleIdentifier</key><string>org.slerm.slerm</string>
+              <key>CFBundleInfoDictionaryVersion</key><string>6.0</string>
+              <key>CFBundlePackageType</key><string>APPL</string>
+              <key>CFBundleShortVersionString</key><string>${version}</string>
+              <key>CFBundleVersion</key><string>${version}</string>
+              <key>LSApplicationCategoryType</key><string>public.app-category.developer-tools</string>
+              <key>LSMinimumSystemVersion</key><string>11.0</string>
+              <key>NSHighResolutionCapable</key><true/>
+              <key>NSSupportsAutomaticGraphicsSwitching</key><true/>
+            </dict>
+            </plist>
+            EOF
+            mv "$out/bin/slerm" "$app/Contents/MacOS/slerm"
+            ln -s "$app/Contents/MacOS/slerm" "$out/bin/slerm"
+          '';
           ghosttyEnv = {
             GHOSTTY_SOURCE_DIR = "${ghostty-src}";
             GHOSTTY_ZIG_SYSTEM_DIR = "${ghosttyDeps}";
@@ -183,6 +212,10 @@
                 "--skip=tests::osc7_wins_over_the_process_directory_but_only_for_this_machine"
               ];
 
+              postInstall = lib.optionalString pkgs.stdenv.hostPlatform.isDarwin (
+                appBundle manifest.package.version
+              );
+
               postFixup = lib.optionalString pkgs.stdenv.hostPlatform.isLinux ''
                 wrapProgram "$out/bin/slerm" \
                   --suffix LD_LIBRARY_PATH : ${lib.makeLibraryPath runtimeLibraries} \

result

@@ -1 +1 @@
-/nix/store/c0ngrz7m1zjs95pb9qm3rx5ka3sbvpvb-slerm-0.1.0
+/nix/store/6vj9g5xzxd0whdnxd0zsg02m1rwsrlrn-slerm-0.1.0

src/app.rs

@@ -23,6 +23,37 @@ pub struct App {
     suppressed: HashSet<egui::Key>,
 }
 
+/// Width kept free at the left of the tab bar for the macOS traffic lights,
+/// which float over the content once the titlebar is hidden.
+const TITLEBAR_INSET: f32 = 70.0;
+/// Height the tab bar needs so the traffic lights fit inside it.
+const TITLEBAR_HEIGHT: f32 = 28.0;
+
+/// With the titlebar hidden the tab bar takes its place, so let the empty space
+/// beside the tabs drag the window and double-click to zoom, like a titlebar.
+fn drag_window(ui: &mut egui::Ui) {
+    let used = ui.min_rect();
+    let free = Rect::from_min_max(
+        egui::pos2(used.right(), used.top()),
+        egui::pos2(ui.max_rect().right(), used.bottom()),
+    );
+    if free.width() <= 0.0 {
+        return;
+    }
+    let response = ui.interact(
+        free,
+        ui.id().with("titlebar drag"),
+        egui::Sense::click_and_drag(),
+    );
+    if response.double_clicked() {
+        let maximized = ui.input(|i| i.viewport().maximized.unwrap_or(false));
+        ui.ctx()
+            .send_viewport_cmd(egui::ViewportCommand::Maximized(!maximized));
+    } else if response.drag_started_by(egui::PointerButton::Primary) {
+        ui.ctx().send_viewport_cmd(egui::ViewportCommand::StartDrag);
+    }
+}
+
 pub fn fonts(config: &Config) -> Result<egui::FontDefinitions> {
     let mut fonts = egui::FontDefinitions::default();
     if let Some(path) = &config.font_path {
@@ -353,6 +384,10 @@ impl eframe::App for App {
         let mut action = None;
         egui::TopBottomPanel::top("tabs").show(ctx, |ui| {
             ui.horizontal_wrapped(|ui| {
+                if cfg!(target_os = "macos") {
+                    ui.add_space(TITLEBAR_INSET);
+                    ui.set_min_height(TITLEBAR_HEIGHT);
+                }
                 for (index, tab) in self.tabs.iter().enumerate() {
                     let title = self.panes[&tab.active].terminal.title().unwrap_or("");
                     let label = if title.is_empty() {
@@ -396,6 +431,9 @@ impl eframe::App for App {
                     }
                 });
             });
+            if cfg!(target_os = "macos") {
+                drag_window(ui);
+            }
         });
         if let Some(error) = self.error.clone() {
             egui::TopBottomPanel::bottom("error").show(ctx, |ui| {

src/main.rs

@@ -67,12 +67,21 @@ fn main() -> Result<()> {
         return Ok(());
     }
     libghostty_vt::kitty::graphics::set_png_decoder(Some(Box::new(render::PngDecoder)))?;
+    let mut viewport = egui::ViewportBuilder::default()
+        .with_title("slerm")
+        .with_inner_size([config.window_width, config.window_height])
+        .with_min_inner_size([320.0, 200.0])
+        .with_app_id("slerm");
+    if cfg!(target_os = "macos") {
+        // Hide the titlebar and draw under it; the traffic lights stay on top of
+        // the tab bar, which reserves room for them (see app::TITLEBAR_INSET).
+        viewport = viewport
+            .with_fullsize_content_view(true)
+            .with_titlebar_shown(false)
+            .with_title_shown(false);
+    }
     let options = eframe::NativeOptions {
-        viewport: egui::ViewportBuilder::default()
-            .with_title("slerm")
-            .with_inner_size([config.window_width, config.window_height])
-            .with_min_inner_size([320.0, 200.0])
-            .with_app_id("slerm"),
+        viewport,
         renderer: eframe::Renderer::Wgpu,
         ..Default::default()
     };