feat: lazy initialization codec

internal/encoding/codec/codec.go

@@ -0,0 +1,11 @@
+package codec
+
+type Codec interface {
+	// Decode decodes the contents of b into v.
+	// It's primarily used for decoding contents of a file into a map[string]interface{}.
+	Decode(b []byte, v map[string]interface{}) error
+
+	// Encode encodes the contents of v into a byte representation.
+	// It's primarily used for encoding a map[string]interface{} into a file format.
+	Encode(v map[string]interface{}) ([]byte, error)
+}

internal/encoding/dotenv/codec.go

@@ -6,16 +6,21 @@ import (
 	"sort"
 	"strings"
 
+	"github.com/spf13/viper/internal/encoding/codec"
 	"github.com/subosito/gotenv"
 )
 
 const keyDelimiter = "_"
 
-// Codec implements the encoding.Encoder and encoding.Decoder interfaces for encoding data containing environment variables
+// Codec implements the Codec interface for encoding data containing environment variables
 // (commonly called as dotenv format).
 type Codec struct{}
 
-func (Codec) Encode(v map[string]interface{}) ([]byte, error) {
+func New(args ...interface{}) codec.Codec {
+	return &Codec{}
+}
+
+func (*Codec) Encode(v map[string]interface{}) ([]byte, error) {
 	flattened := map[string]interface{}{}
 
 	flattened = flattenAndMergeMap(flattened, v, "", keyDelimiter)
@@ -40,7 +45,7 @@ func (Codec) Encode(v map[string]interface{}) ([]byte, error) {
 	return buf.Bytes(), nil
 }
 
-func (Codec) Decode(b []byte, v map[string]interface{}) error {
+func (*Codec) Decode(b []byte, v map[string]interface{}) error {
 	var buf bytes.Buffer
 
 	_, err := buf.Write(b)

internal/encoding/hcl/codec.go

@@ -4,15 +4,21 @@ import (
 	"bytes"
 	"encoding/json"
 
+	"github.com/spf13/viper/internal/encoding/codec"
+
 	"github.com/hashicorp/hcl"
 	"github.com/hashicorp/hcl/hcl/printer"
 )
 
-// Codec implements the encoding.Encoder and encoding.Decoder interfaces for HCL encoding.
+// Codec implements the encoding.Codec interface for HCL encoding.
 // TODO: add printer config to the codec?
 type Codec struct{}
 
-func (Codec) Encode(v map[string]interface{}) ([]byte, error) {
+func New(args ...interface{}) codec.Codec {
+	return &Codec{}
+}
+
+func (*Codec) Encode(v map[string]interface{}) ([]byte, error) {
 	b, err := json.Marshal(v)
 	if err != nil {
 		return nil, err
@@ -35,6 +41,6 @@ func (Codec) Encode(v map[string]interface{}) ([]byte, error) {
 	return buf.Bytes(), nil
 }
 
-func (Codec) Decode(b []byte, v map[string]interface{}) error {
+func (*Codec) Decode(b []byte, v map[string]interface{}) error {
 	return hcl.Unmarshal(b, &v)
 }