No Forced Paths

internal/project/project.go

@@ -138,11 +138,15 @@ func (p *Project) ValidateLayout() error {
 		}
 	}
 
-	for label, path := range map[string]string{
+	for label, pathFn := range map[string]func() string{
-		"paths.source": p.SourceDir(),
+		"paths.source": p.SourceDir,
-		"paths.assets": p.AssetsDir(),
+		"paths.assets": p.AssetsDir,
-		"paths.build":  p.BuildDir(),
+		"paths.build":  p.BuildDir,
 	} {
+		path := pathFn()
+		if path == "" || filepath.Clean(path) == p.Root {
+			continue
+		}
 		info, err := os.Stat(path)
 		if err != nil {
 			if label == "paths.assets" && errors.Is(err, os.ErrNotExist) {
@@ -164,13 +168,22 @@ func (p *Project) ValidateLayout() error {
 }
 
 func (p *Project) Scan() error {
-	sourceFiles, sourceExts, err := scanDir(p.SourceDir(), func(path string) bool {
+	var sourceFiles []string
+	var sourceExts []string
+
+	sourceDir := p.SourceDir()
+	if sourceDir != "" && filepath.Clean(sourceDir) != p.Root {
+		var err error
+		sourceFiles, sourceExts, err = scanDir(sourceDir, func(path string) bool {
 			ext := strings.ToLower(filepath.Ext(path))
 			return ext == ".json" || ext == ".nss"
 		})
 		if err != nil {
+			if !errors.Is(err, os.ErrNotExist) {
 				return fmt.Errorf("scan source tree: %w", err)
 			}
+		}
+	}
 
 	assetFiles, _, err := scanDir(p.AssetsDir(), func(path string) bool {
 		ext := strings.ToLower(filepath.Ext(path))