add vendoring

vendor/gitlab.com/etke.cc/go/env/env.go

@@ -0,0 +1,59 @@
+package env
+
+import (
+	"os"
+	"strconv"
+	"strings"
+)
+
+var envprefix string
+
+// SetPrefix sets prefix for all env vars
+func SetPrefix(prefix string) {
+	envprefix = prefix
+}
+
+// String returns string vars
+func String(shortkey string, defaultValue string) string {
+	key := strings.ToUpper(envprefix + "_" + strings.ReplaceAll(shortkey, ".", "_"))
+	value := strings.TrimSpace(os.Getenv(key))
+	if value == "" {
+		return defaultValue
+	}
+
+	return value
+}
+
+// Int returns int vars
+func Int(shortkey string, defaultValue int) int {
+	str := String(shortkey, "")
+	if str == "" {
+		return defaultValue
+	}
+
+	val, err := strconv.Atoi(str)
+	if err != nil {
+		return defaultValue
+	}
+
+	return val
+}
+
+// Bool returns boolean vars (1, true, yes)
+func Bool(shortkey string) bool {
+	str := strings.ToLower(String(shortkey, ""))
+	if str == "" {
+		return false
+	}
+	return (str == "1" || str == "true" || str == "yes")
+}
+
+// Slice returns slice from space-separated strings, eg: export VAR="one two three" => []string{"one", "two", "three"}
+func Slice(shortkey string) []string {
+	str := String(shortkey, "")
+	if str == "" {
+		return nil
+	}
+
+	return strings.Split(str, " ")
+}