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package main
import (
"os"
"path/filepath"
"github.com/fsnotify/fsnotify"
)
// Watch one or more files, but instead of watching the file directly it watches
// the parent directory. This solves various issues where files are frequently
// renamed, such as editors saving them.
func file(files ...string) {
if len(files) < 1 {
exit("must specify at least one file to watch")
}
// Create a new watcher.
w, err := fsnotify.NewWatcher()
if err != nil {
exit("creating a new watcher: %s", err)
}
defer w.Close()
// Start listening for events.
go fileLoop(w, files)
// Add all files from the commandline.
for _, p := range files {
st, err := os.Lstat(p)
if err != nil {
exit("%s", err)
}
if st.IsDir() {
exit("%q is a directory, not a file", p)
}
// Watch the directory, not the file itself.
err = w.Add(filepath.Dir(p))
if err != nil {
exit("%q: %s", p, err)
}
}
printTime("ready; press ^C to exit")
<-make(chan struct{}) // Block forever
}
func fileLoop(w *fsnotify.Watcher, files []string) {
i := 0
for {
select {
// Read from Errors.
case err, ok := <-w.Errors:
if !ok { // Channel was closed (i.e. Watcher.Close() was called).
return
}
printTime("ERROR: %s", err)
// Read from Events.
case e, ok := <-w.Events:
if !ok { // Channel was closed (i.e. Watcher.Close() was called).
return
}
// Ignore files we're not interested in. Can use a
// map[string]struct{} if you have a lot of files, but for just a
// few files simply looping over a slice is faster.
var found bool
for _, f := range files {
if f == e.Name {
found = true
}
}
if !found {
continue
}
// Just print the event nicely aligned, and keep track how many
// events we've seen.
i++
printTime("%3d %s", i, e)
}
}
}
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