Merge pull request #822 from gpanders/split-resizing

macos: implement split resizing

src/apprt/embedded.zig

@@ -92,6 +92,9 @@ pub const App = struct {
         /// Focus the previous/next split (if any).
         focus_split: ?*const fn (SurfaceUD, input.SplitFocusDirection) callconv(.C) void = null,
 
+        /// Resize the current split.
+        resize_split: ?*const fn (SurfaceUD, input.SplitResizeDirection, u16) callconv(.C) void = null,
+
         /// Zoom the current split.
         toggle_split_zoom: ?*const fn (SurfaceUD) callconv(.C) void = null,
 
@@ -384,6 +387,15 @@ pub const Surface = struct {
         func(self.opts.userdata, direction);
     }
 
+    pub fn resizeSplit(self: *const Surface, direction: input.SplitResizeDirection, amount: u16) void {
+        const func = self.app.opts.resize_split orelse {
+            log.info("runtime embedder does not support resize split", .{});
+            return;
+        };
+
+        func(self.opts.userdata, direction, amount);
+    }
+
     pub fn toggleSplitZoom(self: *const Surface) void {
         const func = self.app.opts.toggle_split_zoom orelse {
             log.info("runtime embedder does not support split zoom", .{});
@@ -1374,6 +1386,14 @@ pub const CAPI = struct {
         ptr.gotoSplit(direction);
     }
 
+    /// Resize the current split by moving the split divider in the given
+    /// direction. `direction` specifies which direction the split divider will
+    /// move relative to the focused split. `amount` is a fractional value
+    /// between 0 and 1 that specifies by how much the divider will move.
+    export fn ghostty_surface_split_resize(ptr: *Surface, direction: input.SplitResizeDirection, amount: u16) void {
+        ptr.resizeSplit(direction, amount);
+    }
+
     /// Invoke an action on the surface.
     export fn ghostty_surface_binding_action(
         ptr: *Surface,