feat: handle other options for prefix

viper.go

@@ -1241,7 +1241,8 @@ func (v *Viper) BindFlagValue(key string, flag FlagValue) error {
 // If more arguments are provided, they will represent the env variable names that
 // should bind to this key and will be taken in the specified order.
 // EnvPrefix will be used when set when env name is not provided.
-func BindEnv(input ...string) error { return v.BindEnv(input...) }
+func BindEnv(input ...string) error         { return v.BindEnv(input...) }
+func BindEnvNoPrefix(input ...string) error { return v.BindEnvNoPrefix(input...) }
 
 func (v *Viper) BindEnv(input ...string) error {
 	if len(input) == 0 {
@@ -1253,7 +1254,27 @@ func (v *Viper) BindEnv(input ...string) error {
 	if len(input) == 1 {
 		v.env[key] = append(v.env[key], v.mergeWithEnvPrefix(key))
 	} else {
-		v.env[key] = append(v.env[key], input[1:]...)
+		for _, otherKey := range input[1:] {
+			v.env[key] = append(v.env[key], v.mergeWithEnvPrefix(otherKey))
+		}
+	}
+
+	return nil
+}
+
+func (v *Viper) BindEnvNoPrefix(input ...string) error {
+	if len(input) == 0 {
+		return fmt.Errorf("missing key to bind to")
+	}
+
+	key := strings.ToLower(input[0])
+
+	if len(input) == 1 {
+		v.env[key] = append(v.env[key], strings.ToUpper(key))
+	} else {
+		for _, otherKey := range input[1:] {
+			v.env[key] = append(v.env[key], strings.ToUpper(otherKey))
+		}
 	}
 
 	return nil

viper_test.go

@@ -694,6 +694,48 @@ func TestAutoEnvWithPrefix(t *testing.T) {
 	assert.Equal(t, "13", Get("bar"))
 }
 
+func TestAutoEnvWithPrefixAndOthers(t *testing.T) {
+	Reset()
+
+	AutomaticEnv()
+	replacer := strings.NewReplacer("-", "_", ".", "_")
+	SetEnvKeyReplacer(replacer)
+	SetEnvPrefix("foo")
+	BindEnv([]string{"bar", "baz.id", "qux"}...)
+
+	t.Setenv("FOO_BAZ_ID", "13")
+
+	assert.Equal(t, "13", Get("bar"))
+}
+
+func TestAutoEnvWithPrefixAndOthersNoPrefixArray(t *testing.T) {
+	Reset()
+
+	AutomaticEnv()
+	replacer := strings.NewReplacer("-", "_", ".", "_")
+	SetEnvKeyReplacer(replacer)
+	SetEnvPrefix("foo")
+	BindEnvNoPrefix([]string{"bar", "OTHER"}...)
+
+	t.Setenv("OTHER", "13")
+
+	assert.Equal(t, "13", Get("bar"))
+}
+
+func TestAutoEnvWithPrefixAndOthersNoPrefixSingle(t *testing.T) {
+	Reset()
+
+	AutomaticEnv()
+	replacer := strings.NewReplacer("-", "_", ".", "_")
+	SetEnvKeyReplacer(replacer)
+	SetEnvPrefix("foo")
+	BindEnvNoPrefix([]string{"bar"}...)
+
+	t.Setenv("BAR", "13")
+
+	assert.Equal(t, "13", Get("bar"))
+}
+
 func TestSetEnvKeyReplacer(t *testing.T) {
 	Reset()