Move app quit to apprt action (#4577)

This changes quit signaling from a boolean return from core app `tick()`
to an apprt action. This simplifies the API and conceptually makes more
sense to me now.

This wasn't done just for that; this change was also needed so that
macOS can quit cleanly while fixing #4540 since we may no longer trigger
menu items. I wanted to split this out into a separate commit/PR because
it adds complexity making the diff harder to read.

include/ghostty.h

@@ -559,6 +559,7 @@ typedef struct {
 
 // apprt.Action.Key
 typedef enum {
+  GHOSTTY_ACTION_QUIT,
   GHOSTTY_ACTION_NEW_WINDOW,
   GHOSTTY_ACTION_NEW_TAB,
   GHOSTTY_ACTION_NEW_SPLIT,
@@ -681,7 +682,7 @@ void ghostty_config_open();
 ghostty_app_t ghostty_app_new(const ghostty_runtime_config_s*,
                               ghostty_config_t);
 void ghostty_app_free(ghostty_app_t);
-bool ghostty_app_tick(ghostty_app_t);
+void ghostty_app_tick(ghostty_app_t);
 void* ghostty_app_userdata(ghostty_app_t);
 void ghostty_app_set_focus(ghostty_app_t, bool);
 bool ghostty_app_key(ghostty_app_t, ghostty_input_key_s);

macos/Sources/Ghostty/Ghostty.App.swift

@@ -117,23 +117,7 @@ extension Ghostty {
 
         func appTick() {
             guard let app = self.app else { return }
-
+            ghostty_app_tick(app)
-            // Tick our app, which lets us know if we want to quit
-            let exit = ghostty_app_tick(app)
-            if (!exit) { return }
-
-            // On iOS, applications do not terminate programmatically like they do
-            // on macOS. On iOS, applications are only terminated when a user physically
-            // closes the application (i.e. going to the home screen). If we request
-            // exit on iOS we ignore it.
-            #if os(iOS)
-            logger.info("quit request received, ignoring on iOS")
-            #endif
-
-            #if os(macOS)
-            // We want to quit, start that process
-            NSApplication.shared.terminate(nil)
-            #endif
         }
 
         func openConfig() {
@@ -454,6 +438,9 @@ extension Ghostty {
 
             // Action dispatch
             switch (action.tag) {
+            case GHOSTTY_ACTION_QUIT:
+                quit(app)
+
             case GHOSTTY_ACTION_NEW_WINDOW:
                 newWindow(app, target: target)
 
@@ -559,6 +546,21 @@ extension Ghostty {
             }
         }
 
+        private static func quit(_ app: ghostty_app_t) {
+            // On iOS, applications do not terminate programmatically like they do
+            // on macOS. On iOS, applications are only terminated when a user physically
+            // closes the application (i.e. going to the home screen). If we request
+            // exit on iOS we ignore it.
+            #if os(iOS)
+            logger.info("quit request received, ignoring on iOS")
+            #endif
+
+            #if os(macOS)
+            // We want to quit, start that process
+            NSApplication.shared.terminate(nil)
+            #endif
+        }
+
         private static func newWindow(_ app: ghostty_app_t, target: ghostty_target_s) {
             switch (target.tag) {
             case GHOSTTY_TARGET_APP:

src/App.zig

@@ -54,9 +54,6 @@ focused_surface: ?*Surface = null,
 /// this is a blocking queue so if it is full you will get errors (or block).
 mailbox: Mailbox.Queue,
 
-/// Set to true once we're quitting. This never goes false again.
-quit: bool,
-
 /// The set of font GroupCache instances shared by surfaces with the
 /// same font configuration.
 font_grid_set: font.SharedGridSet,
@@ -98,7 +95,6 @@ pub fn create(
         .alloc = alloc,
         .surfaces = .{},
         .mailbox = .{},
-        .quit = false,
         .font_grid_set = font_grid_set,
         .config_conditional_state = .{},
     };
@@ -125,9 +121,7 @@ pub fn destroy(self: *App) void {
 /// Tick ticks the app loop. This will drain our mailbox and process those
 /// events. This should be called by the application runtime on every loop
 /// tick.
-///
+pub fn tick(self: *App, rt_app: *apprt.App) !void {
-/// This returns whether the app should quit or not.
-pub fn tick(self: *App, rt_app: *apprt.App) !bool {
     // If any surfaces are closing, destroy them
     var i: usize = 0;
     while (i < self.surfaces.items.len) {
@@ -142,13 +136,6 @@ pub fn tick(self: *App, rt_app: *apprt.App) !bool {
 
     // Drain our mailbox
     try self.drainMailbox(rt_app);
-
-    // No matter what, we reset the quit flag after a tick. If the apprt
-    // doesn't want to quit, then we can't force it to.
-    defer self.quit = false;
-
-    // We quit if our quit flag is on
-    return self.quit;
 }
 
 /// Update the configuration associated with the app. This can only be
@@ -272,7 +259,7 @@ fn drainMailbox(self: *App, rt_app: *apprt.App) !void {
             // can try to quit as quickly as possible.
             .quit => {
                 log.info("quit message received, short circuiting mailbox drain", .{});
-                self.setQuit();
+                try self.performAction(rt_app, .quit);
                 return;
             },
         }
@@ -314,12 +301,6 @@ pub fn newWindow(self: *App, rt_app: *apprt.App, msg: Message.NewWindow) !void {
     );
 }
 
-/// Start quitting
-pub fn setQuit(self: *App) void {
-    if (self.quit) return;
-    self.quit = true;
-}
-
 /// Handle an app-level focus event. This should be called whenever
 /// the focus state of the entire app containing Ghostty changes.
 /// This is separate from surface focus events. See the `focused`
@@ -437,7 +418,7 @@ pub fn performAction(
     switch (action) {
         .unbind => unreachable,
         .ignore => {},
-        .quit => self.setQuit(),
+        .quit => try rt_app.performAction(.app, .quit, {}),
         .new_window => try self.newWindow(rt_app, .{ .parent = null }),
         .open_config => try rt_app.performAction(.app, .open_config, {}),
         .reload_config => try rt_app.performAction(.app, .reload_config, .{}),

src/apprt/action.zig

@@ -70,6 +70,9 @@ pub const Action = union(Key) {
     //    entry. If the value type is void then only the key needs to be
     //    added. Ensure the order matches exactly with the Zig code.
 
+    /// Quit the application.
+    quit,
+
     /// Open a new window. The target determines whether properties such
     /// as font size should be inherited.
     new_window,
@@ -219,6 +222,7 @@ pub const Action = union(Key) {
 
     /// Sync with: ghostty_action_tag_e
     pub const Key = enum(c_int) {
+        quit,
         new_window,
         new_tab,
         new_split,

src/apprt/embedded.zig

@@ -1332,10 +1332,9 @@ pub const CAPI = struct {
 
     /// Tick the event loop. This should be called whenever the "wakeup"
     /// callback is invoked for the runtime.
-    export fn ghostty_app_tick(v: *App) bool {
+    export fn ghostty_app_tick(v: *App) void {
-        return v.core_app.tick(v) catch |err| err: {
+        v.core_app.tick(v) catch |err| {
             log.err("error app tick err={}", .{err});
-            break :err false;
         };
     }
 

src/apprt/glfw.zig

@@ -35,6 +35,10 @@ pub const App = struct {
     app: *CoreApp,
     config: Config,
 
+    /// Flips to true to quit on the next event loop tick. This
+    /// never goes false and forces the event loop to exit.
+    quit: bool = false,
+
     /// Mac-specific state.
     darwin: if (Darwin.enabled) Darwin else void,
 
@@ -124,8 +128,10 @@ pub const App = struct {
             glfw.waitEvents();
 
             // Tick the terminal app
-            const should_quit = try self.app.tick(self);
+            try self.app.tick(self);
-            if (should_quit or self.app.surfaces.items.len == 0) {
+
+            // If the tick caused us to quit, then we're done.
+            if (self.quit or self.app.surfaces.items.len == 0) {
                 for (self.app.surfaces.items) |surface| {
                     surface.close(false);
                 }
@@ -149,6 +155,8 @@ pub const App = struct {
         value: apprt.Action.Value(action),
     ) !void {
         switch (action) {
+            .quit => self.quit = true,
+
             .new_window => _ = try self.newSurface(switch (target) {
                 .app => null,
                 .surface => |v| v,

src/apprt/gtk/App.zig

@@ -460,6 +460,7 @@ pub fn performAction(
     value: apprt.Action.Value(action),
 ) !void {
     switch (action) {
+        .quit => self.quit(),
         .new_window => _ = try self.newWindow(switch (target) {
             .app => null,
             .surface => |v| v,
@@ -1075,9 +1076,7 @@ fn loadCustomCss(self: *App) !void {
         defer file.close();
 
         log.info("loading gtk-custom-css path={s}", .{path});
-        const contents = try file.reader().readAllAlloc(
+        const contents = try file.reader().readAllAlloc(self.core_app.alloc, 5 * 1024 * 1024 // 5MB
-            self.core_app.alloc,
-            5 * 1024 * 1024 // 5MB
         );
         defer self.core_app.alloc.free(contents);
 
@@ -1174,14 +1173,10 @@ pub fn run(self: *App) !void {
         _ = c.g_main_context_iteration(self.ctx, 1);
 
         // Tick the terminal app and see if we should quit.
-        const should_quit = try self.core_app.tick(self);
+        try self.core_app.tick(self);
 
         // Check if we must quit based on the current state.
         const must_quit = q: {
-            // If we've been told by GTK that we should quit, do so regardless
-            // of any other setting.
-            if (should_quit) break :q true;
-
             // If we are configured to always stay running, don't quit.
             if (!self.config.@"quit-after-last-window-closed") break :q false;
 
@@ -1285,6 +1280,9 @@ fn newWindow(self: *App, parent_: ?*CoreSurface) !void {
 }
 
 fn quit(self: *App) void {
+    // If we're already not running, do nothing.
+    if (!self.running) return;
+
     // If we have no toplevel windows, then we're done.
     const list = c.gtk_window_list_toplevels();
     if (list == null) {
@@ -1625,7 +1623,9 @@ fn gtkActionQuit(
     ud: ?*anyopaque,
 ) callconv(.C) void {
     const self: *App = @ptrCast(@alignCast(ud orelse return));
-    self.core_app.setQuit();
+    self.core_app.performAction(self, .quit) catch |err| {
+        log.err("error quitting err={}", .{err});
+    };
 }
 
 /// Action sent by the window manager asking us to present a specific surface to