working build of generated file

flake.nix

@@ -23,6 +23,7 @@
 
       perSystem =
         {
+          lib,
           pkgs,
           system,
           ...
@@ -62,6 +63,7 @@
                     pkgs.sqlite
                   ])
                 }:./.dart_tool/hooks_runner/shared/nexus/build/gomuks";
+                CPATH = lib.makeSearchPath "include" [ pkgs.glibc.dev ];
 
                 # ANDROID_HOME = "${android.androidsdk}/libexec/android-sdk";
                 # ANDROID_SDK_ROOT = ANDROID_HOME;

lib/controllers/client_controller.dart

@@ -8,7 +8,11 @@ import "package:nexus/models/sync_status.dart";
 import "package:nexus/src/third_party/gomuks.g.dart";
 import "package:flutter_riverpod/flutter_riverpod.dart";
 
-void gomuksCallback(Pointer<Char> command, int requestId, GomuksBuffer data) {
+void gomuksCallback(
+  Pointer<Char> command,
+  int requestId,
+  GomuksBorrowedBuffer data,
+) {
   try {
     final muksEventType = command.cast<Utf8>().toDartString();
     final Map<String, dynamic> decodedMuksEvent = data.toJson();
@@ -34,9 +38,9 @@ class ClientController extends Notifier<int> {
 
     GomuksStart(
       handle,
-      Pointer.fromFunction<Void Function(Pointer<Char>, Int64, GomuksBuffer)>(
-        gomuksCallback,
-      ),
+      Pointer.fromFunction<
+        Void Function(Pointer<Char>, Int64, GomuksBorrowedBuffer)
+      >(gomuksCallback),
     );
 
     return handle;

lib/helpers/extensions/gomuks_buffer.dart

@@ -5,6 +5,14 @@ import "dart:typed_data";
 import "package:ffi/ffi.dart";
 import "package:nexus/src/third_party/gomuks.g.dart";
 
+extension GomuksBufferToJson on GomuksBorrowedBuffer {
+  Map<String, dynamic> toJson() {
+    final bytes = toBytes();
+    if (bytes.isEmpty) return {};
+    return jsonDecode(utf8.decode(bytes));
+  }
+}
+
 extension JsonToGomuksBuffer on Map<String, dynamic> {
   GomuksBuffer toGomuksBuffer() {
     final jsonString = json.encode(this);

scripts/generate.dart

@@ -76,7 +76,7 @@ void main(List<String> args) async {
     ),
     headers: Headers(
       entryPoints: [File(join(buildDir.path, "libgomuks.h")).uri],
-      // compilerOptions: ["-I${String.fromEnvironment("CPATH")}"],
+      compilerOptions: ["--no-warnings"],
     ),
     functions: Functions.includeAll,
   ).generate();