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watch.go
47 lines (41 loc) · 839 Bytes
/
watch.go
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package main
import (
"log"
"github.com/fsnotify/fsnotify"
)
func watch(name string) <-chan string {
logPrintf("creating new watcher")
w, err := fsnotify.NewWatcher()
if err != nil {
log.Fatalf("unable to create new watcher: %v", err)
}
isWrite := func(op fsnotify.Op) bool {
return op&fsnotify.Create == fsnotify.Create ||
op&fsnotify.Write == fsnotify.Write
}
ch := make(chan string)
go func() {
for {
select {
case event, ok := <-w.Events:
if !ok {
return
}
logPrintf("received event: %v", event)
if isWrite(event.Op) {
ch <- event.Name
}
case err, ok := <-w.Errors:
if !ok {
return
}
logPrintf("received error: %v", err)
}
}
}()
err = w.Add(name)
if err != nil {
log.Fatalf("unable to start watching file or directory %q", err)
}
return ch
}