✨ Add AddFormatter function to allow custom builds to register new formatters

formatters/null.go

@@ -5,28 +5,19 @@ import (
 	"github.com/spf13/viper"
 )
 
-func newNull(ff *viper.Viper) (Formatter, error) {
-	return &Null{}, nil
+const FormatNull = "zero"
+
+func newNull(*viper.Viper) (Formatter, error) {
+	return Null{}, nil
 }
 
 type Null struct{}
 
-func (n *Null) Name() string {
-	return "zero"
+func (Null) Name() string {
+	return FormatNull
 }
 
-func (n *Null) Meta(m models.Meta) (o []byte, err error) {
-	return
-}
-
-func (n *Null) Entry(e models.Entry) (o []byte, err error) {
-	return
-}
-
-func (n *Null) Log(l models.Log) (o []byte, err error) {
-	return
-}
-
-func (n *Null) Logs(logs []models.Log) (out []byte, err error) {
-	return
-}
+func (Null) Meta(m models.Meta) (o []byte, err error)       { return }
+func (Null) Entry(e models.Entry) (o []byte, err error)     { return }
+func (Null) Log(l models.Log) (o []byte, err error)         { return }
+func (Null) Logs(logs []models.Log) (out []byte, err error) { return }