hot reload, search refactor begin

app/watch.go

@@ -0,0 +1,136 @@
+package app
+
+import (
+	"io/fs"
+	"log"
+	"os"
+	"path/filepath"
+	"time"
+
+	"github.com/Theodor-Springmann-Stiftung/musenalm/templating"
+	"github.com/fsnotify/fsnotify"
+)
+
+const (
+	WATCHER_DEBOUNCE = 300 * time.Millisecond
+)
+
+// INFO: this is hot reload for poor people
+type Watcher struct {
+	*fsnotify.Watcher
+}
+
+func RefreshWatcher(engine *templating.Engine) (*Watcher, error) {
+	watcher := Watcher{}
+	w, err := fsnotify.NewWatcher()
+	if err != nil {
+		return nil, err
+	}
+	watcher.Watcher = w
+
+	done := make(chan bool)
+
+	go func() {
+		var reloadTimer *time.Timer
+
+		for {
+			select {
+			case event := <-watcher.Events:
+				if event.Op&(fsnotify.Create|fsnotify.Write|fsnotify.Remove|fsnotify.Rename) != 0 {
+					if reloadTimer != nil {
+						reloadTimer.Stop()
+					}
+					reloadTimer = time.AfterFunc(WATCHER_DEBOUNCE, func() {
+						log.Println("Changes detected, reloading templates...")
+						engine.Refresh()
+					})
+				}
+
+				if event.Op&fsnotify.Create == fsnotify.Create {
+					fi, statErr := os.Stat(event.Name)
+					if statErr == nil && fi.IsDir() {
+						_ = watcher.Add(event.Name)
+						log.Printf("Now watching new directory: %s", event.Name)
+					}
+				}
+
+			case err := <-watcher.Errors:
+				if err != nil {
+					log.Printf("fsnotify error: %v\n", err)
+				}
+
+			case <-done:
+				watcher.Close()
+				return
+			}
+		}
+	}()
+
+	return &watcher, nil
+
+}
+
+func EngineWatcher(engine *templating.Engine) (*Watcher, error) {
+	watcher := Watcher{}
+	w, err := fsnotify.NewWatcher()
+	if err != nil {
+		return nil, err
+	}
+	watcher.Watcher = w
+
+	done := make(chan bool)
+
+	go func() {
+		var reloadTimer *time.Timer
+
+		for {
+			select {
+			case event := <-watcher.Events:
+				if event.Op&(fsnotify.Create|fsnotify.Write|fsnotify.Remove|fsnotify.Rename) != 0 {
+					if reloadTimer != nil {
+						reloadTimer.Stop()
+					}
+					reloadTimer = time.AfterFunc(WATCHER_DEBOUNCE, func() {
+						log.Println("Changes detected, reloading templates...")
+						engine.Reload()
+					})
+				}
+
+				if event.Op&fsnotify.Create == fsnotify.Create {
+					fi, statErr := os.Stat(event.Name)
+					if statErr == nil && fi.IsDir() {
+						_ = watcher.Add(event.Name)
+						log.Printf("Now watching new directory: %s", event.Name)
+					}
+				}
+
+			case err := <-watcher.Errors:
+				if err != nil {
+					log.Printf("fsnotify error: %v\n", err)
+				}
+
+			case <-done:
+				watcher.Close()
+				return
+			}
+		}
+	}()
+
+	return &watcher, nil
+}
+
+func (w *Watcher) AddRecursive(root string) error {
+	return filepath.WalkDir(root, func(path string, d fs.DirEntry, err error) error {
+		if err != nil {
+			return err
+		}
+		if d.IsDir() {
+			werr := w.Add(path)
+			if werr != nil {
+				return werr
+			}
+			log.Printf("Now watching directory: %s", path)
+		}
+		return nil
+	})
+}