use TOML not JSON for configuration

2 files changed, 7 insertions, 6 deletions

diff --git a/internal/hexaicli/run_test.go b/internal/hexaicli/run_test.go
index 77daa8b..d192850 100644
--- a/internal/hexaicli/run_test.go
+++ b/internal/hexaicli/run_test.go
@@ -107,7 +107,7 @@ func TestRunWithClient_ErrorPrint(t *testing.T) {
 func TestRun_OpenAI_NoKey_ShowsError(t *testing.T) {
 	dir := testingTempDir(t)
 	// write config with provider=openai
-	writeJSON(t, filepath.Join(dir, "hexai", "config.json"), map[string]any{"provider": "openai", "openai_model": "gpt-x"})
+	writeTOML(t, filepath.Join(dir, "hexai", "config.toml"), map[string]string{"provider": "openai", "openai_model": "gpt-x"})
 	t.Setenv("XDG_CONFIG_HOME", dir)
 	// Ensure no OpenAI API key is present in environment
 	t.Setenv("HEXAI_OPENAI_API_KEY", "")
diff --git a/internal/hexaicli/testhelpers_test.go b/internal/hexaicli/testhelpers_test.go
index 512a3ba..93f1e3d 100644
--- a/internal/hexaicli/testhelpers_test.go
+++ b/internal/hexaicli/testhelpers_test.go
@@ -3,7 +3,6 @@ package hexaicli
 
 import (
 	"context"
-	"encoding/json"
 	"os"
 	"path/filepath"
 	"testing"
@@ -62,8 +61,8 @@ func (s *fakeStreamer) ChatStream(ctx context.Context, messages []llm.Message, o
 	return nil
 }
 
-// small JSON writer for tests
-func writeJSON(t *testing.T, path string, v any) {
+// small TOML writer for tests (string values only)
+func writeTOML(t *testing.T, path string, m map[string]string) {
 	t.Helper()
 	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
 		t.Fatalf("mkdir: %v", err)
@@ -73,8 +72,10 @@ func writeJSON(t *testing.T, path string, v any) {
 		t.Fatalf("create: %v", err)
 	}
 	defer f.Close()
-	if err := json.NewEncoder(f).Encode(v); err != nil {
-		t.Fatalf("encode: %v", err)
+	for k, v := range m {
+		if _, err := f.WriteString(k + " = \"" + v + "\"\n"); err != nil {
+			t.Fatalf("write: %v", err)
+		}
 	}
 }