Merge pull request #30 from antonmashko/28-yaml

#28 yaml support

external/yaml/go.mod

@@ -0,0 +1,5 @@
+module github.com/antonmashko/envconf/external/yaml
+
+go 1.16
+
+require gopkg.in/yaml.v3 v3.0.1

external/yaml/go.sum

@@ -0,0 +1,4 @@
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

external/yaml/yaml.go

@@ -0,0 +1,13 @@
+package yaml
+
+import "gopkg.in/yaml.v3"
+
+type Yaml []byte
+
+func (y Yaml) TagName() string {
+	return "yaml"
+}
+
+func (y Yaml) Unmarshal(v interface{}) error {
+	return yaml.Unmarshal(y, v)
+}

external/yaml/yaml_test.go

@@ -0,0 +1,31 @@
+package yaml
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestYamlConf_ParseSimple_Ok(t *testing.T) {
+	var data = `
+a: Easy!
+b:
+  c: 2
+  d: [3, 4]
+`
+	tc := struct {
+		A string
+		B struct {
+			RenamedC int   `yaml:"c"`
+			D        []int `yaml:",flow"`
+		}
+	}{}
+	extConf := Yaml([]byte(data))
+	err := extConf.Unmarshal(&tc)
+	if err != nil {
+		t.Error("unexpected error")
+	}
+
+	if tc.A != "Easy!" && tc.B.RenamedC != 2 && !reflect.DeepEqual([]int{3, 4}, tc.B.D) {
+		t.Errorf("incorrect values: %#v", tc)
+	}
+}