Add EDN support

Added support for edn files

README.md

@@ -245,6 +245,7 @@ There are several most popular config file formats supported:
 - JSON
 - TOML
 - ENV
+- EDN
 
 ## Integration
 

cleanenv.go

@@ -30,6 +30,7 @@ import (
 	"github.com/BurntSushi/toml"
 	"github.com/joho/godotenv"
 	"gopkg.in/yaml.v2"
+	"olympos.io/encoding/edn"
 )
 
 const (
@@ -124,6 +125,8 @@ func parseFile(path string, cfg interface{}) error {
 		err = parseJSON(f, cfg)
 	case ".toml":
 		err = parseTOML(f, cfg)
+	case ".edn":
+		err = parseEDN(f, cfg)
 	case ".env":
 		err = parseENV(f, cfg)
 	default:
@@ -151,6 +154,11 @@ func parseTOML(r io.Reader, str interface{}) error {
 	return err
 }
 
+// parseEDN parses EDN from reader to data structure
+func parseEDN(r io.Reader, str interface{}) error {
+	return edn.NewDecoder(r).Decode(str)
+}
+
 // parseENV, in fact, doesn't fill the structure with environment variable values.
 // It just parses ENV file and sets all variables to the environment.
 // Thus, the structure should be filled at the next steps.

cleanenv_test.go

@@ -852,10 +852,10 @@ func TestFUsage(t *testing.T) {
 
 func TestReadConfig(t *testing.T) {
 	type config struct {
-		Number    int64  `yaml:"number" env:"TEST_NUMBER" env-default:"1"`
-		String    string `yaml:"string" env:"TEST_STRING" env-default:"default"`
-		NoDefault string `yaml:"no-default" env:"TEST_NO_DEFAULT"`
-		NoEnv     string `yaml:"no-env" env-default:"default"`
+		Number    int64  `edn:"number" yaml:"number" env:"TEST_NUMBER" env-default:"1"`
+		String    string `edn:"string" yaml:"string" env:"TEST_STRING" env-default:"default"`
+		NoDefault string `edn:"no-default" yaml:"no-default" env:"TEST_NO_DEFAULT"`
+		NoEnv     string `edn:"no-env" yaml:"no-env" env-default:"default"`
 	}
 
 	tests := []struct {
@@ -866,6 +866,51 @@ func TestReadConfig(t *testing.T) {
 		want    *config
 		wantErr bool
 	}{
+		{
+			name: "edn_only",
+			file: `
+			{
+				:number 2
+				:string "test"
+				:no-default "NoDefault"
+				:no-env "this"
+			}
+`,
+			ext: "edn",
+			env: nil,
+			want: &config{
+				Number:    2,
+				String:    "test",
+				NoDefault: "NoDefault",
+				NoEnv:     "this",
+			},
+			wantErr: false,
+		},
+
+		{
+			name: "edn_and_env",
+			file: `
+			{
+				:number 2
+				:string "test"
+				:no-default "NoDefault"
+				:no-env "this"
+			}
+`,
+			ext: "edn",
+			env: map[string]string{
+				"TEST_NUMBER": "3",
+				"TEST_STRING": "fromEnv",
+			},
+			want: &config{
+				Number:    3,
+				String:    "fromEnv",
+				NoDefault: "NoDefault",
+				NoEnv:     "this",
+			},
+			wantErr: false,
+		},
+
 		{
 			name: "yaml_only",
 			file: `

go.mod

@@ -4,6 +4,7 @@ require (
 	github.com/BurntSushi/toml v0.3.1
 	github.com/joho/godotenv v1.3.0
 	gopkg.in/yaml.v2 v2.2.2
+	olympos.io/encoding/edn v0.0.0-20200308123125-93e3b8dd0e24
 )
 
 go 1.13

go.sum

@@ -6,3 +6,5 @@ gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+olympos.io/encoding/edn v0.0.0-20200308123125-93e3b8dd0e24 h1:sreVOrDp0/ezb0CHKVek/l7YwpxPJqv+jT3izfSphA4=
+olympos.io/encoding/edn v0.0.0-20200308123125-93e3b8dd0e24/go.mod h1:oVgVk4OWVDi43qWBEyGhXgYxt7+ED4iYNpTngSLX2Iw=