fix: add error detail for package import path detection

internal/arcgen/lang/util/package_import_name.go

@@ -21,7 +21,7 @@ func DetectPackageImportPath(path string) (string, error) {
 
 	if pkg.ImportPath == "." {
 		// If ImportPath is ".", it means the directory is not in GOPATH or inside a module
-		return "", fmt.Errorf("path=%s: %w", absDir, apperr.ErrFailedToDetectPackageImportPath)
+		return "", fmt.Errorf("path=%s: pkg=%#v: %w", absDir, *pkg, apperr.ErrFailedToDetectPackageImportPath)
 	}
 
 	return pkg.ImportPath, nil

pkg/errors/errors.go

@@ -8,7 +8,7 @@ import (
 
 var (
 	ErrLanguageNotSupported                  = errors.New("language not supported")
-	ErrFailedToDetectPackageImportPath       = errors.New("failed to detect package import path. Please use the --" + config.OptionGoORMStructPackageImportPath + " option")
+	ErrFailedToDetectPackageImportPath       = errors.New("failed to detect package import path. Please use the --" + config.OptionGoORMStructPackageImportPath + " option, or run include the package in your GOPATH or module (GO111MODULE=auto may be required)")
 	ErrSourceFileOrDirectoryIsNotSet         = errors.New("source file or directory is not set")
 	ErrInvalidSourceSet                      = errors.New("invalid source set")
 	ErrGoColumnTagAnnotationNotFoundInSource = errors.New("go-column-tag annotation not found in source")