From 45a2e290aa2bc59deb5971255accba517500cc25 Mon Sep 17 00:00:00 2001
From: Alan Pearce
Date: Wed, 19 Jun 2024 13:50:37 +0200
Subject: fix dev server/live reload

---
 internal/server/dev.go | 55 ++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 44 insertions(+), 11 deletions(-)

(limited to 'internal/server/dev.go')

diff --git a/internal/server/dev.go b/internal/server/dev.go
index f7ebb82..ce718eb 100644
--- a/internal/server/dev.go
+++ b/internal/server/dev.go
@@ -5,7 +5,9 @@ import (
 	"io/fs"
 	"log/slog"
 	"os"
+	"path"
 	"path/filepath"
+	"slices"
 	"time"
 	"website/internal/log"
 
@@ -17,6 +19,29 @@ type FileWatcher struct {
 	*fsnotify.Watcher
 }
 
+var (
+	ignores = []string{
+		"*.templ",
+		"*.go",
+	}
+	checkSettleInterval = 200 * time.Millisecond
+)
+
+func matches(name string) func(string) bool {
+	return func(pattern string) bool {
+		matched, err := path.Match(pattern, name)
+		if err != nil {
+			log.Warn("error checking watcher ignores", "error", err)
+		}
+
+		return matched
+	}
+}
+
+func ignored(pathname string) bool {
+	return slices.ContainsFunc(ignores, matches(path.Base(pathname)))
+}
+
 func NewFileWatcher() (*FileWatcher, error) {
 	watcher, err := fsnotify.NewWatcher()
 	if err != nil {
@@ -46,23 +71,31 @@ func (watcher FileWatcher) AddRecursive(from string) error {
 }
 
 func (watcher FileWatcher) Start(callback func(string)) {
+	var timer *time.Timer
 	for {
 		select {
 		case event := <-watcher.Events:
-			if event.Has(fsnotify.Create) || event.Has(fsnotify.Rename) {
-				f, err := os.Stat(event.Name)
-				if err != nil {
-					slog.Error(fmt.Sprintf("error handling %s event: %v", event.Op.String(), err))
-				} else if f.IsDir() {
-					err = watcher.Add(event.Name)
+			if !ignored(event.Name) {
+				log.Info("watcher event", "name", event.Name, "op", event.Op.String())
+				if event.Has(fsnotify.Create) || event.Has(fsnotify.Rename) {
+					f, err := os.Stat(event.Name)
 					if err != nil {
-						slog.Error(fmt.Sprintf("error adding new folder to watcher: %v", err))
+						slog.Error(fmt.Sprintf("error handling %s event: %v", event.Op.String(), err))
+					} else if f.IsDir() {
+						err = watcher.Add(event.Name)
+						if err != nil {
+							slog.Error(fmt.Sprintf("error adding new folder to watcher: %v", err))
+						}
 					}
 				}
-			}
-			if event.Has(fsnotify.Rename) || event.Has(fsnotify.Write) {
-				callback(event.Name)
-				time.Sleep(500 * time.Millisecond)
+				if event.Has(fsnotify.Rename) || event.Has(fsnotify.Write) {
+					if timer == nil {
+						timer = time.AfterFunc(checkSettleInterval, func() {
+							callback(event.Name)
+						})
+					}
+					timer.Reset(checkSettleInterval)
+				}
 			}
 		case err := <-watcher.Errors:
 			slog.Error(fmt.Sprintf("error in watcher: %v", err))
-- 
cgit 1.4.1