feat: add utility to get boolean env var

Author: marjune163

src/util/env.go

@@ -0,0 +1,30 @@
+package util
+
+import (
+	"os"
+	"strings"
+)
+
+func GetBoolEnv(key string) bool {
+	return isTruthyEnvValue(os.Getenv(key))
+}
+
+func isTruthyEnvValue(value string) bool {
+	valueLen := len(value)
+
+	if valueLen == 0 {
+		return false
+	}
+
+	if strings.EqualFold(value, "false") {
+		return false
+	}
+
+	for i := 0; i < valueLen; i++ {
+		if value[i] != '0' {
+			return true
+		}
+	}
+
+	return false
+}

src/util/env_test.go

@@ -0,0 +1,42 @@
+package util
+
+import "testing"
+
+func TestIsTruthyEnvValue(t *testing.T) {
+	expect := func(input string, expectResult bool) bool {
+		result := isTruthyEnvValue(input)
+		return result == expectResult
+	}
+
+	if !expect("", false) {
+		t.Error()
+	}
+
+	if !expect("false", false) {
+		t.Error()
+	}
+
+	if !expect("fAlse", false) {
+		t.Error()
+	}
+
+	if !expect("true", true) {
+		t.Error()
+	}
+
+	if !expect("truE", true) {
+		t.Error()
+	}
+
+	if !expect("1", true) {
+		t.Error()
+	}
+
+	if !expect("0", false) {
+		t.Error()
+	}
+
+	if !expect("0000", false) {
+		t.Error()
+	}
+}