add NoopUI and NoopLogger

Signed-off-by: Michael Maximilien <[email protected]>

Author: cppforlife

ui/noop_logger.go

@@ -0,0 +1,12 @@
+package ui
+
+type NoopLogger struct{}
+
+func NewNoopLogger() NoopLogger {
+	return NoopLogger{}
+}
+
+var _ ExternalLogger = NoopLogger{}
+
+func (l NoopLogger) Error(tag, msg string, args ...interface{}) {}
+func (l NoopLogger) Debug(tag, msg string, args ...interface{}) {}

ui/noop_ui.go

@@ -0,0 +1,9 @@
+package ui
+
+import (
+	"io/ioutil"
+)
+
+func NewNoopUI() *WriterUI {
+	return NewWriterUI(ioutil.Discard, ioutil.Discard, NewNoopLogger())
+}