diff --git a/main.go b/main.go
index 9dd1b82..fcf7883 100644
--- a/main.go
+++ b/main.go
@@ -48,11 +48,11 @@ func main() {
 	outdir := flag.String("o", ".", "Output directory")
 	flag.Parse()
 	files := flag.Args()
-	// if len(files) == 0 {
-	// 	Error.Printf("No files specified")
-	// 	flag.Usage()
-	// 	return
-	// }
+	if len(files) == 0 {
+		Error.Printf("No files specified")
+		flag.Usage()
+		return
+	}
 
 	ltemplate, err := template.New("class").Funcs(fns).Parse(templatestr)
 	if err != nil {
@@ -70,13 +70,7 @@ func main() {
 				Error.Printf("Error parsing file: %v", err)
 				return
 			}
-
-			outfile, err := class.GetOutFile(*outdir)
-			if err != nil {
-				Error.Printf("Error creating output file: %v", err)
-				return
-			}
-			ltemplate.Execute(outfile, class)
+			class.Write(*outdir, ltemplate)
 		}(file)
 	}
 	wg.Wait()
diff --git a/types.go b/types.go
index 65d7838..a932e12 100644
--- a/types.go
+++ b/types.go
@@ -5,6 +5,7 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"text/template"
 )
 
 type (
@@ -57,3 +58,15 @@ func (c *Class) GetOutFile(root string) (*os.File, error) {
 	}
 	return f, nil
 }
+
+func (c *Class) Write(root string, tmpl *template.Template) error {
+	outfile, err := c.GetOutFile(root)
+	if err != nil {
+		return fmt.Errorf("error creating output file %v: %v", c.ClassName, err)
+	}
+	err = tmpl.Execute(outfile, c)
+	if err != nil {
+		return fmt.Errorf("error writing output file %v: %v", c.ClassName, err)
+	}
+	return nil
+}