feat: add ui responder that returns the default value (#43)

Author: twelvelabs

ui/responder.go

@@ -30,3 +30,10 @@ func RespondError(err error) Responder {
 		return nil, err
 	}
 }
+
+// RespondDefault creates a responder that returns the prompt's default value.
+func RespondDefault() Responder {
+	return func(p Prompt) (any, error) {
+		return p.Value, nil
+	}
+}

ui/responder_test.go

@@ -34,3 +34,12 @@ func TestRespondError(t *testing.T) {
 	assert.ErrorContains(t, err, "boom")
 	assert.Nil(t, response)
 }
+
+func TestRespondDefault(t *testing.T) {
+	responder := RespondDefault()
+	response, err := responder(Prompt{
+		Value: "foo",
+	})
+	assert.NoError(t, err)
+	assert.Equal(t, "foo", response)
+}