first commit

pkg/config/options.go

@@ -0,0 +1,23 @@
+package config
+
+type (
+	// Option defines the method to customize the config options.
+	Option func(opt *options)
+
+	options struct {
+		env bool
+	}
+)
+
+// UseEnv customizes the config to use environment variables.
+func UseEnv() Option {
+	return func(opt *options) {
+		opt.env = true
+	}
+}
+
+func SetEnv(f bool) Option {
+	return func(opt *options) {
+		opt.env = f
+	}
+}