refactor: use event type constants correctly

core/command_tokens.go

@@ -5,7 +5,7 @@ import (
 )
 
 func replaceTokens(text string, event *ChangeEvent) string {
-	text = strings.ReplaceAll(text, "{type}", event.Type)
+	text = strings.ReplaceAll(text, "{type}", event.Type.String())
 	return strings.ReplaceAll(text, "{file}", event.FileName)
 }
 

core/event_types/event_types.go

@@ -1,10 +1,22 @@
 package event_types
 
-type EventType = string
+type EventType string
 
 var (
 	Create EventType = "CREATE"
-	Write            = "WRITE"
-	Remove           = "REMOVE"
-	Rename           = "RENAME"
+	Write  EventType = "WRITE"
+	Remove EventType = "REMOVE"
+	Rename EventType = "RENAME"
 )
+
+func (e EventType) IsValid() bool {
+	switch e {
+	case Create, Write, Remove, Rename:
+		return true
+	}
+	return false
+}
+
+func (e EventType) String() string {
+	return string(e)
+}

infrastructure/file_watcher.go

@@ -14,7 +14,7 @@ func loop(watcher *fsnotify.Watcher, callback core.ChangeCallback) {
 			if !ok {
 				continue
 			}
-			changeEvent := core.ChangeEvent{Type: event.Op.String(), FileName: event.Name}
+			changeEvent := core.ChangeEvent{Type: event.Op, FileName: event.Name}
 			callback(&changeEvent, nil)
 		case err, _ := <-watcher.Errors:
 			if err != nil {