refactor: add Ecosystem() method to PackageManager interface

guard/guard.go

@@ -279,19 +279,8 @@ func (g *packageManagerGuard) clearStatus() {
 func (g *packageManagerGuard) handleManifestInstallation(ctx context.Context, parsedCommand *packagemanager.ParsedCommand) error {
 	g.setStatus("Extracting packages from manifest files")
 
-	// Create extractor with appropriate ecosystem
-	var ecosystem packagev1.Ecosystem
-	switch g.packageManager.Name() {
-	case "pip":
-		ecosystem = packagev1.Ecosystem_ECOSYSTEM_PYPI
-	case "npm", "pnpm":
-		ecosystem = packagev1.Ecosystem_ECOSYSTEM_NPM
-	default:
-		return fmt.Errorf("unsupported package manager for manifest extraction: %s", g.packageManager.Name())
-	}
-
 	extractorConfig := extractor.NewDefaultExtractorConfig()
-	extractorConfig.ExtractorEcosystem = ecosystem
+	extractorConfig.ExtractorEcosystem = g.packageManager.Ecosystem()
 
 	packageExtractor := extractor.New(*extractorConfig)
 

packagemanager/npm.go

@@ -43,6 +43,10 @@ func (npm *npmPackageManager) Name() string {
 	return "npm"
 }
 
+func (npm *npmPackageManager) Ecosystem() packagev1.Ecosystem {
+	return packagev1.Ecosystem_ECOSYSTEM_NPM
+}
+
 func (npm *npmPackageManager) ParseCommand(args []string) (*ParsedCommand, error) {
 	if len(args) > 0 && (args[0] == "npm" || args[0] == "pnpm") {
 		args = args[1:]

packagemanager/packagemanager.go

@@ -60,6 +60,9 @@ type PackageManager interface {
 	// ParseCommand parses the command and returns a parsed command
 	// specific to the package manager implementation
 	ParseCommand(args []string) (*ParsedCommand, error)
+
+	// Ecosystem of the package manager
+	Ecosystem() packagev1.Ecosystem
 }
 
 // PackageResolver is the contract for resolving package info

packagemanager/pypi.go

@@ -37,6 +37,10 @@ func (pip *pipPackageManager) Name() string {
 	return "pip"
 }
 
+func (pip *pipPackageManager) Ecosystem() packagev1.Ecosystem {
+	return packagev1.Ecosystem_ECOSYSTEM_PYPI
+}
+
 func (pip *pipPackageManager) ParseCommand(args []string) (*ParsedCommand, error) {
 	if len(args) > 0 && args[0] == "pip" {
 		args = args[1:]