Move Generation Destinations

internal/project/project.go

@@ -145,6 +145,12 @@ func (p *Project) ValidateLayout() error {
 	} {
 		info, err := os.Stat(path)
 		if err != nil {
+			if label == "paths.assets" && errors.Is(err, os.ErrNotExist) && p.isCachePath(path) {
+				if mkErr := os.MkdirAll(path, 0o755); mkErr != nil {
+					failures = append(failures, fmt.Errorf("%s: create cache directory %s: %w", label, path, mkErr))
+				}
+				continue
+			}
 			failures = append(failures, fmt.Errorf("%s: %w", label, err))
 			continue
 		}
@@ -160,6 +166,15 @@ func (p *Project) ValidateLayout() error {
 	return nil
 }
 
+func (p *Project) isCachePath(path string) bool {
+	rel, err := filepath.Rel(p.Root, path)
+	if err != nil || strings.HasPrefix(rel, ".."+string(filepath.Separator)) || rel == ".." {
+		return false
+	}
+	parts := strings.Split(filepath.Clean(rel), string(filepath.Separator))
+	return len(parts) > 0 && parts[0] == ".cache"
+}
+
 func (p *Project) Scan() error {
 	sourceFiles, sourceExts, err := scanDir(p.SourceDir(), func(path string) bool {
 		ext := strings.ToLower(filepath.Ext(path))
@@ -334,7 +349,7 @@ func defaultConfig() Config {
 			Build:  "build",
 		},
 		TopData: TopDataConfig{
-			Build: "build/topdata",
+			Build: ".cache/topdata",
 		},
 	}
 }

internal/project/project_test.go

@@ -82,6 +82,29 @@ func TestTopDataAssetsDirReturnsEmptyForNoConfig(t *testing.T) {
 	}
 }
 
+func TestValidateLayoutCreatesMissingCacheAssetsDir(t *testing.T) {
+	root := t.TempDir()
+	mkdirAll(t, filepath.Join(root, "src"))
+	mkdirAll(t, filepath.Join(root, "build"))
+
+	proj := &Project{
+		Root: root,
+		Config: Config{
+			Module: ModuleConfig{Name: "Test", ResRef: "test"},
+			Paths:  PathConfig{Source: "src", Assets: ".cache/module-assets", Build: "build"},
+		},
+	}
+
+	if err := proj.ValidateLayout(); err != nil {
+		t.Fatalf("ValidateLayout returned error: %v", err)
+	}
+	if info, err := os.Stat(filepath.Join(root, ".cache", "module-assets")); err != nil {
+		t.Fatalf("expected cache assets dir to be created: %v", err)
+	} else if !info.IsDir() {
+		t.Fatalf("expected cache assets path to be a directory")
+	}
+}
+
 func mkdirAll(t *testing.T, path string) {
 	t.Helper()
 	if err := os.MkdirAll(path, 0o755); err != nil {