// Watches the html/*.html templates for changes:
func WatchTemplates(name, templatePath, glob string, preParse func(*template.Template) *template.Template, uiTmpl **template.Template) (watcher *notify.Watcher, deferClean func(), err error) {
if preParse == nil {
preParse = func(t *template.Template) *template.Template { return t }
}
// Parse template files:
ui, err := preParse(template.New(name)).ParseGlob(path.Join(base.CanonicalPath(templatePath), glob))
if err != nil {
return nil, nil, err
}
*uiTmpl = ui
// Watch template directory for file changes:
watcher, err = notify.NewWatcher()
if err != nil {
return nil, nil, err
}
deferClean = func() { watcher.RemoveWatch(templatePath); watcher.Close() }
// Process watcher events
go func() {
for {
select {
case ev := <-watcher.Event:
if ev == nil {
break
}
//log.Println("event:", ev)
// Update templates:
var err error
ui, err := preParse(template.New(name)).ParseGlob(path.Join(base.CanonicalPath(templatePath), glob))
if err != nil {
log.Println(err)
break
}
*uiTmpl = ui
case err := <-watcher.Error:
if err == nil {
break
}
log.Println("watcher error:", err)
}
}
}()
// Watch template file for changes:
watcher.Watch(templatePath)
return
}
func ExampleNewWatcher() {
watcher, err := notify.NewWatcher()
if err != nil {
log.Fatal(err)
}
go func() {
for {
select {
case ev := <-watcher.Event:
log.Println("event:", ev)
case err := <-watcher.Error:
log.Println("error:", err)
}
}
}()
err = watcher.Watch("/tmp/foo")
if err != nil {
log.Fatal(err)
}
}