hugolib: Avoid processing the same notify event twice

On `macOS`, at least, we've seen multiple WRITE events for same file, and no need to do the same job twice.

diff --git a/hugolib/site.go b/hugolib/site.go
index 768fe147f9fe5d4983d40d448b44d57ff7d7ff98..d8e40f039f037f5401adb6acd6d92c0d5af5c90b 100644 (file)
--- a/hugolib/site.go
+++ b/hugolib/site.go
@@ -633,8 +633,15 @@ func (s *Site) reProcess(events []fsnotify.Event) (whatChanged, error) {
        shortcodesChanged := make(map[string]bool)
        // prevent spamming the log on changes
        logger := helpers.NewDistinctFeedbackLogger()
+       seen := make(map[fsnotify.Event]bool)
 
        for _, ev := range events {
+               // Avoid processing the same event twice.
+               if seen[ev] {
+                       continue
+               }
+               seen[ev] = true
+
                if s.isContentDirEvent(ev) {
                        logger.Println("Source changed", ev.Name)
                        sourceChanged = append(sourceChanged, ev)