fix: log watched file changes at debug level

internal/watcher/pattern.go

@@ -101,6 +101,7 @@ func (p *pattern) handle(event *watcher.Event) {
 	}
 
 	if p.allowReload(event) {
+		logChangedFile(event)
 		p.events <- eventHolder{p.patternGroup, event}
 	}
 }
@@ -114,13 +115,26 @@ func isValidEventType(effectType watcher.EffectType) bool {
 }
 
 func isValidPathType(event *watcher.Event) bool {
-	if event.PathType == watcher.PathTypeWatcher && globalLogger.Enabled(globalCtx, slog.LevelDebug) {
+	if event.PathType == watcher.PathTypeWatcher && globalLogger != nil && globalLogger.Enabled(globalCtx, slog.LevelDebug) {
 		globalLogger.LogAttrs(globalCtx, slog.LevelDebug, "special e-dant/watcher event", slog.Any("event", event))
 	}
 
 	return event.PathType <= watcher.PathTypeHardLink
 }
 
+func logChangedFile(event *watcher.Event) {
+	if globalLogger == nil || !globalLogger.Enabled(globalCtx, slog.LevelDebug) {
+		return
+	}
+
+	attrs := []slog.Attr{slog.String("path", event.PathName)}
+	if event.AssociatedPathName != "" {
+		attrs = append(attrs, slog.String("associated_path", event.AssociatedPathName))
+	}
+
+	globalLogger.LogAttrs(globalCtx, slog.LevelDebug, "filesystem change detected", attrs...)
+}
+
 func (p *pattern) isValidPattern(fileName string) bool {
 	if fileName == "" {
 		return false

internal/watcher/pattern_test.go

@@ -3,6 +3,9 @@
 package watcher
 
 import (
+	"bytes"
+	"context"
+	"log/slog"
 	"path/filepath"
 	"strings"
 	"testing"
@@ -355,6 +358,29 @@ func TestAnAssociatedEventTriggersTheWatcher(t *testing.T) {
 	assert.Equal(t, e, (<-w.events).event)
 }
 
+func TestAcceptedEventLogsChangedPathAtDebugLevel(t *testing.T) {
+	var logs bytes.Buffer
+	previousCtx := globalCtx
+	previousLogger := globalLogger
+	globalCtx = context.Background()
+	globalLogger = slog.New(slog.NewTextHandler(&logs, &slog.HandlerOptions{Level: slog.LevelDebug}))
+	t.Cleanup(func() {
+		globalCtx = previousCtx
+		globalLogger = previousLogger
+	})
+
+	w := newPattern(t, "/**/*.php")
+	w.events = make(chan eventHolder, 1)
+
+	changedPath := normalizePath(t, "/path/file.php")
+	e := &watcher.Event{PathName: changedPath}
+
+	w.handle(e)
+
+	assert.Equal(t, e, (<-w.events).event)
+	assert.Contains(t, logs.String(), changedPath)
+}
+
 func relativeDir(t *testing.T, relativePath string) string {
 	t.Helper()