Update go dependencies

vendor/github.com/imkira/go-interpol/options.go

@@ -0,0 +1,68 @@
+package interpol
+
+import "io"
+
+// Options contains all options supported by an Interpolator.
+type Options struct {
+	Template io.Reader
+	Format   Func
+	Output   io.Writer
+}
+
+// Option is an option that can be applied to an Interpolator.
+type Option func(OptionSetter)
+
+// OptionSetter is an interface that contains the setters for all options
+// supported by Interpolator.
+type OptionSetter interface {
+	SetTemplate(template io.Reader)
+	SetFormat(format Func)
+	SetOutput(output io.Writer)
+}
+
+// WithTemplate assigns Template to Options.
+func WithTemplate(template io.Reader) Option {
+	return func(setter OptionSetter) {
+		setter.SetTemplate(template)
+	}
+}
+
+// WithFormat assigns Format to Options.
+func WithFormat(format Func) Option {
+	return func(setter OptionSetter) {
+		setter.SetFormat(format)
+	}
+}
+
+// WithOutput assigns Output to Options.
+func WithOutput(output io.Writer) Option {
+	return func(setter OptionSetter) {
+		setter.SetOutput(output)
+	}
+}
+
+type optionSetter struct {
+	opts *Options
+}
+
+func newOptionSetter(opts *Options) *optionSetter {
+	return &optionSetter{opts: opts}
+}
+
+func (s *optionSetter) SetTemplate(template io.Reader) {
+	s.opts.Template = template
+}
+
+func (s *optionSetter) SetFormat(format Func) {
+	s.opts.Format = format
+}
+
+func (s *optionSetter) SetOutput(output io.Writer) {
+	s.opts.Output = output
+}
+
+func setOptions(opts []Option, setter OptionSetter) {
+	for _, opt := range opts {
+		opt(setter)
+	}
+}