macos: log configuration errors

include/ghostty.h

@@ -250,6 +250,10 @@ typedef struct {
 // Fully defined types. This MUST be kept in sync with equivalent Zig
 // structs. To find the Zig struct, grep for this type name. The documentation
 // for all of these types is available in the Zig source.
+typedef struct {
+    const char *message;
+} ghostty_error_s;
+
 typedef struct {
     void *userdata;
     void *nsview;
@@ -303,6 +307,8 @@ void ghostty_config_load_recursive_files(ghostty_config_t);
 void ghostty_config_finalize(ghostty_config_t);
 bool ghostty_config_get(ghostty_config_t, void *, const char *, uintptr_t);
 ghostty_input_trigger_s ghostty_config_trigger(ghostty_config_t, const char *, uintptr_t);
+uint32_t ghostty_config_errors_count(ghostty_config_t);
+ghostty_error_s ghostty_config_get_error(ghostty_config_t, uint32_t);
 
 ghostty_app_t ghostty_app_new(const ghostty_runtime_config_s *, ghostty_config_t);
 void ghostty_app_free(ghostty_app_t);

macos/Sources/Ghostty/AppState.swift

@@ -128,6 +128,20 @@ extension Ghostty {
             // Finalize will make our defaults available.
             ghostty_config_finalize(cfg)
             
+            // Log any configuration errors. These will be automatically shown in a
+            // pop-up window too.
+            let errCount = ghostty_config_errors_count(cfg)
+            if errCount > 0 {
+                AppDelegate.logger.warning("config error: \(errCount) configuration errors on reload")
+                var errors: [String] = [];
+                for i in 0..<errCount {
+                    let err = ghostty_config_get_error(cfg, UInt32(i))
+                    let message = String(cString: err.message)
+                    errors.append(message)
+                    AppDelegate.logger.warning("config error: \(message)")
+                }
+            }
+            
             return cfg
         }
         

src/config/CAPI.zig

@@ -108,3 +108,18 @@ fn config_trigger_(
     const action = try inputpkg.Binding.Action.parse(str);
     return self.keybind.set.getTrigger(action) orelse .{};
 }
+
+export fn ghostty_config_errors_count(self: *Config) u32 {
+    return @intCast(self._errors.list.items.len);
+}
+
+export fn ghostty_config_get_error(self: *Config, idx: u32) Error {
+    if (idx >= self._errors.list.items.len) return .{};
+    const err = self._errors.list.items[idx];
+    return .{ .message = err.message.ptr };
+}
+
+/// Sync with ghostty_error_s
+const Error = extern struct {
+    message: [*:0]const u8 = "",
+};