apprt: action to change conditional state, implement for embedded

include/ghostty.h

@@ -567,6 +567,7 @@ typedef enum {
   GHOSTTY_ACTION_SECURE_INPUT,
   GHOSTTY_ACTION_KEY_SEQUENCE,
   GHOSTTY_ACTION_COLOR_CHANGE,
+  GHOSTTY_ACTION_CONFIG_CHANGE_CONDITIONAL_STATE,
 } ghostty_action_tag_e;
 
 typedef union {

src/Surface.zig

@@ -94,11 +94,6 @@ keyboard: Keyboard,
 /// less important.
 pressed_key: ?input.KeyEvent = null,
 
-/// The current color scheme of the GUI element containing this surface.
-/// This will default to light until the apprt sends us the actual color
-/// scheme. This is used by mode 3031 and CSI 996 n.
-color_scheme: apprt.ColorScheme = .light,
-
 /// The hash value of the last keybinding trigger that we performed. This
 /// is only set if the last key input matched a keybinding, consumed it,
 /// and performed it. This is used to prevent sending release/repeat events
@@ -121,6 +116,12 @@ size: renderer.Size,
 /// the lifetime of. This makes updating config at runtime easier.
 config: DerivedConfig,
 
+/// The conditional state of the configuration. This can affect
+/// how certain configurations take effect such as light/dark mode.
+/// This is managed completely by Ghostty core but an apprt action
+/// is sent whenever this changes.
+config_conditional_state: configpkg.ConditionalState,
+
 /// This is set to true if our IO thread notifies us our child exited.
 /// This is used to determine if we need to confirm, hold open, etc.
 child_exited: bool = false,
@@ -480,6 +481,7 @@ pub fn init(
         .io_thr = undefined,
         .size = size,
         .config = derived_config,
+        .config_conditional_state = .{},
     };
 
     // The command we're going to execute
@@ -777,7 +779,7 @@ pub fn needsConfirmQuit(self: *Surface) bool {
 /// surface.
 pub fn handleMessage(self: *Surface, msg: Message) !void {
     switch (msg) {
-        .change_config => |config| try self.changeConfig(config),
+        .change_config => |config| try self.updateConfig(config),
 
         .set_title => |*v| {
             // We ignore the message in case the title was set via config.
@@ -935,7 +937,7 @@ fn passwordInput(self: *Surface, v: bool) !void {
 
 /// Sends a DSR response for the current color scheme to the pty.
 fn reportColorScheme(self: *Surface) !void {
-    const output = switch (self.color_scheme) {
+    const output = switch (self.config_conditional_state.theme) {
         .light => "\x1B[?997;2n",
         .dark => "\x1B[?997;1n",
     };
@@ -1058,8 +1060,25 @@ fn updateRendererHealth(self: *Surface, health: renderer.Health) void {
     };
 }
 
-/// Update our configuration at runtime.
+/// This should be called anytime `config_conditional_state` changes
-fn changeConfig(self: *Surface, config: *const configpkg.Config) !void {
+/// so that the apprt can reload the configuration.
+fn notifyConfigConditionalState(self: *Surface) void {
+    self.rt_app.performAction(
+        .{ .surface = self },
+        .config_change_conditional_state,
+        {},
+    ) catch |err| {
+        log.warn("failed to notify app of config state change err={}", .{err});
+    };
+}
+
+/// Update our configuration at runtime. This can be called by the apprt
+/// to set a surface-specific configuration that differs from the app
+/// or other surfaces.
+pub fn updateConfig(
+    self: *Surface,
+    config: *const configpkg.Config,
+) !void {
     // Update our new derived config immediately
     const derived = DerivedConfig.init(self.alloc, config) catch |err| {
         // If the derivation fails then we just log and return. We don't
@@ -3590,11 +3609,17 @@ pub fn colorSchemeCallback(self: *Surface, scheme: apprt.ColorScheme) !void {
     crash.sentry.thread_state = self.crashThreadState();
     defer crash.sentry.thread_state = null;
 
-    // If our scheme didn't change, then we don't do anything.
+    const new_scheme: configpkg.ConditionalState.Theme = switch (scheme) {
-    if (self.color_scheme == scheme) return;
+        .light => .light,
+        .dark => .dark,
+    };
 
-    // Set our new scheme
+    // If our scheme didn't change, then we don't do anything.
-    self.color_scheme = scheme;
+    if (self.config_conditional_state.theme == new_scheme) return;
+
+    // Setup our conditional state which has the current color theme.
+    self.config_conditional_state.theme = new_scheme;
+    self.notifyConfigConditionalState();
 
     // If mode 2031 is on, then we report the change live.
     const report = report: {

src/apprt/action.zig

@@ -193,6 +193,13 @@ pub const Action = union(Key) {
     /// such as OSC 10/11.
     color_change: ColorChange,
 
+    /// The state of conditionals in the configuration has changed, so
+    /// the configuration should be reloaded. The apprt doesn't need
+    /// to do a full physical reload; it should call the
+    /// `changeConditionalState` function and then `updateConfig`
+    /// on the app or surface.
+    config_change_conditional_state,
+
     /// Sync with: ghostty_action_tag_e
     pub const Key = enum(c_int) {
         new_window,
@@ -228,6 +235,7 @@ pub const Action = union(Key) {
         secure_input,
         key_sequence,
         color_change,
+        config_change_conditional_state,
     };
 
     /// Sync with: ghostty_action_u

src/apprt/embedded.zig

@@ -430,6 +430,28 @@ pub const App = struct {
         comptime action: apprt.Action.Key,
         value: apprt.Action.Value(action),
     ) !void {
+        // Special case certain actions before they are sent to the
+        // embedded apprt.
+        self.performPreAction(target, action, value);
+
+        log.debug("dispatching action target={s} action={} value={}", .{
+            @tagName(target),
+            action,
+            value,
+        });
+        self.opts.action(
+            self,
+            target.cval(),
+            @unionInit(apprt.Action, @tagName(action), value).cval(),
+        );
+    }
+
+    fn performPreAction(
+        self: *App,
+        target: apprt.Target,
+        comptime action: apprt.Action.Key,
+        value: apprt.Action.Value(action),
+    ) void {
         // Special case certain actions before they are sent to the embedder
         switch (action) {
             .set_title => switch (target) {
@@ -443,19 +465,32 @@ pub const App = struct {
                 },
             },
 
+            .config_change_conditional_state => switch (target) {
+                .app => {},
+                .surface => |surface| action: {
+                    // Build our new configuration. We can free the memory
+                    // immediately after because the surface will derive any
+                    // values it needs to.
+                    var new_config = self.config.changeConditionalState(
+                        surface.config_conditional_state,
+                    ) catch |err| {
+                        // Not a big deal if we error... we just don't update
+                        // the config. We log the error and move on.
+                        log.warn("error changing config conditional state err={}", .{err});
+                        break :action;
+                    };
+                    defer new_config.deinit();
+
+                    // Update our surface.
+                    surface.updateConfig(&new_config) catch |err| {
+                        log.warn("error updating surface config for state change err={}", .{err});
+                        break :action;
+                    };
+                },
+            },
+
             else => {},
         }
-
-        log.debug("dispatching action target={s} action={} value={}", .{
-            @tagName(target),
-            action,
-            value,
-        });
-        self.opts.action(
-            self,
-            target.cval(),
-            @unionInit(apprt.Action, @tagName(action), value).cval(),
-        );
     }
 };
 

src/apprt/glfw.zig

@@ -225,6 +225,7 @@ pub const App = struct {
             .renderer_health,
             .color_change,
             .pwd,
+            .config_change_conditional_state,
             => log.info("unimplemented action={}", .{action}),
         }
     }

src/apprt/gtk/App.zig

@@ -487,6 +487,7 @@ pub fn performAction(
         .render_inspector,
         .renderer_health,
         .color_change,
+        .config_change_conditional_state,
         => log.warn("unimplemented action={}", .{action}),
     }
 }

src/config.zig

@@ -7,6 +7,7 @@ pub const string = @import("config/string.zig");
 pub const edit = @import("config/edit.zig");
 pub const url = @import("config/url.zig");
 
+pub const ConditionalState = conditional.State;
 pub const FileFormatter = formatter.FileFormatter;
 pub const entryFormatter = formatter.entryFormatter;
 pub const formatEntry = formatter.formatEntry;

src/config/Config.zig

@@ -2583,7 +2583,7 @@ pub fn loadRecursiveFiles(self: *Config, alloc_gpa: Allocator) !void {
 /// deleted a file that was referenced in the configuration, then the
 /// configuration can still be reloaded.
 pub fn changeConditionalState(
-    self: *Config,
+    self: *const Config,
     new: conditional.State,
 ) !Config {
     // Create our new configuration