apprt: add new_window_layout action

include/ghostty.h

@@ -30,6 +30,8 @@ typedef void* ghostty_app_t;
 typedef void* ghostty_config_t;
 typedef void* ghostty_surface_t;
 typedef void* ghostty_inspector_t;
+typedef void* ghostty_layout_window_t;
+typedef void* ghostty_layout_tab_t;
 
 // All the types below are fully defined and must be kept in sync with
 // their Zig counterparts. Any changes to these types MUST have an associated
@@ -776,6 +778,7 @@ typedef enum {
   GHOSTTY_ACTION_NEW_TAB,
   GHOSTTY_ACTION_CLOSE_TAB,
   GHOSTTY_ACTION_NEW_SPLIT,
+  GHOSTTY_ACTION_NEW_WINDOW_LAYOUT,
   GHOSTTY_ACTION_CLOSE_ALL_WINDOWS,
   GHOSTTY_ACTION_TOGGLE_MAXIMIZE,
   GHOSTTY_ACTION_TOGGLE_FULLSCREEN,
@@ -834,6 +837,7 @@ typedef enum {
 
 typedef union {
   ghostty_action_split_direction_e new_split;
+  ghostty_layout_window_t new_window_layout;
   ghostty_action_fullscreen_e toggle_fullscreen;
   ghostty_action_move_tab_s move_tab;
   ghostty_action_goto_tab_e goto_tab;

src/apprt/action.zig

@@ -91,6 +91,9 @@ pub const Action = union(Key) {
     /// relative to the target.
     new_split: SplitDirection,
 
+    /// Create a new window, tab, etc. as necessary to apply the given layout.
+    new_window_layout: Layout,
+
     /// Close all open windows.
     close_all_windows,
 
@@ -320,6 +323,7 @@ pub const Action = union(Key) {
         new_tab,
         close_tab,
         new_split,
+        new_window_layout,
         close_all_windows,
         toggle_maximize,
         toggle_fullscreen,
@@ -448,6 +452,17 @@ pub const Action = union(Key) {
     }
 };
 
+// See apprt.layout
+pub const Layout = struct {
+    window: apprt.layout.Window,
+
+    pub const C = *const apprt.layout.Window;
+
+    pub fn cval(self: *const Layout) C {
+        return &self.window;
+    }
+};
+
 // This is made extern (c_int) to make interop easier with our embedded
 // runtime. The small size cost doesn't make a difference in our union.
 pub const SplitDirection = enum(c_int) {

src/apprt/layout.zig

@@ -3,6 +3,25 @@ const Allocator = std.mem.Allocator;
 const configpkg = @import("../config.zig");
 const datastruct = @import("../datastruct/main.zig");
 
+/// Window represents a desired predefined layout for a window hierarchy:
+/// a set of tabs, each with their own split tree.
+pub const Window = struct {
+    /// NOTE: For now, we guarantee tabs.len == 1. This is to simplify
+    /// the initial implementation. In the future we will support layouts
+    /// for multiple tabs.
+    tabs: []const SplitTree,
+
+    pub const CApi = struct {
+        pub fn get_tabs_len(self: *const Window) callconv(.c) usize {
+            return self.tabs.len;
+        }
+
+        pub fn get_tabs(self: *const Window) callconv(.c) [*]const SplitTree {
+            return &self.tabs;
+        }
+    };
+};
+
 /// SplitTree represents a desired layout of splits and their associated
 /// surface configurations. This is used by apprts to launch and modify
 /// predefined terminal layouts.