@@ -13,13 +13,17 @@ "gitlab.com/tozd/go/errors"
 )
 
 func GenerateCSP() errors.E {
-	t := reflect.TypeFor[csp.Header]()
+	headerType := reflect.TypeFor[csp.Header]()
 	file, err := os.OpenFile("./csp.go", os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0)
 	if err != nil {
-
-		return errors.WithMessage(err, "could not write to output")
+		return errors.WithMessage(err, "could not open file")
 	}
-	defer file.Close()
+	defer func() {
+		err := file.Close()
+		if err != nil {
+			panic("could not close file: " + err.Error())
+		}
+	}()
 
 	_, err = fmt.Fprintf(file, `package config
 
@@ -29,21 +33,14 @@ import (
 	"github.com/crewjam/csp"
 )
 
+type CSP struct {
 `)
 	if err != nil {
-
 		return errors.WithMessage(err, "could not write to output")
 	}
 
-	_, err = fmt.Fprintf(file, "type CSP struct {\n")
-	if err != nil {
-		return errors.WithMessage(err, "could not write to output")
-	}
-
-	for i := 0; i < t.NumField(); i++ {
-		field := t.Field(i)
-		var t reflect.Type
-		t = field.Type
+	for _, field := range reflect.VisibleFields(headerType) {
+		fieldType := field.Type
 		tags, err := structtag.Parse(string(field.Tag))
 		if err != nil {
 			return errors.WithMessage(err, "could not write to output")
@@ -60,7 +57,7 @@ if err != nil {
 			return errors.WithMessage(err, "could not set toml tag")
 		}
 
-		_, err = fmt.Fprintf(file, "\t%-23s %-28s `%s`\n", field.Name, t, tags.String())
+		_, err = fmt.Fprintf(file, "\t%-23s %-28s `%s`\n", field.Name, fieldType, tags.String())
 		if err != nil {
 			return errors.WithMessage(err, "could not write to output")
 		}