Fix diff with noop logger

cmd/dots/diff.go

@@ -7,6 +7,7 @@ import (
 	"os/exec"
 	"strings"
 
+	"go.evanpurkhiser.com/dots/events"
 	"go.evanpurkhiser.com/dots/installer"
 	"go.evanpurkhiser.com/dots/resolver"
 
@@ -50,6 +51,12 @@ var diffCmd = cobra.Command{
 			OverrideInstallPath: sourceTmp,
 		}
 
+		// No need to output any logging, but we must process the events.
+		noopLogger := events.NewNoopLogger()
+		installConfig.EventLogger = noopLogger.GetEventChan()
+
+		defer noopLogger.LogEvents()()
+
 		dotfiles := resolver.ResolveDotfiles(*sourceConfig, *sourceLockfile)
 		prepared := installer.PrepareDotfiles(dotfiles.Filter(files), *sourceConfig)
 		installer.InstallDotfiles(prepared, installConfig)

events/events.go

@@ -35,3 +35,41 @@ type Event struct {
 	Type   EventType
 	Object interface{}
 }
+
+// NewNoopLogger creates a NoopLogger.
+func NewNoopLogger() *NoopLogger {
+	logger := &NoopLogger{
+		eventChan: make(chan Event),
+	}
+
+	return logger
+}
+
+// NoopLogger may be used to handle event processing without doing
+// anything with the events.
+type NoopLogger struct {
+	eventChan chan Event
+}
+
+// GetEventChan returns the event channel in which no events will be logged.
+func (l *NoopLogger) GetEventChan() chan<- Event {
+	return l.eventChan
+}
+
+// LogEvents processes the Event channel, but will do nothing with the events
+func (l *NoopLogger) LogEvents() func() {
+	stop := make(chan bool)
+
+	go func() {
+		for {
+			select {
+			case <-l.eventChan:
+				continue
+			case <-stop:
+				return
+			}
+		}
+	}()
+
+	return func() { stop <- true }
+}

output/logger.go

@@ -26,7 +26,8 @@ type Config struct {
 // New creates a output logger given a configuration.
 func New(config Config) *Output {
 	logger := &Output{
-		Config: config,
+		Config:    config,
+		eventChan: make(chan events.Event),
 	}
 
 	// Get the max length of the groups
@@ -36,7 +37,6 @@ func New(config Config) *Output {
 			maxDotfileLength = len(d.Path)
 		}
 	}
-	logger.eventChan = make(chan events.Event)
 	logger.maxDotfileLength = maxDotfileLength
 
 	return logger