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|
package main
import (
"io/fs"
"os"
"path/filepath"
"time"
"github.com/fsnotify/fsnotify"
)
// Watcher is a wrapper for watching file changes in directories.
type Watcher struct {
watcher *fsnotify.Watcher
dirs map[string]bool
paths map[string]bool
ignoreNext map[string]bool
recursive bool
}
// NewWatcher returns a new Watcher.
func NewWatcher(recursive bool) (*Watcher, error) {
watcher, err := fsnotify.NewWatcher()
if err != nil {
return nil, err
}
return &Watcher{
watcher: watcher,
dirs: map[string]bool{},
paths: map[string]bool{},
ignoreNext: map[string]bool{},
recursive: recursive,
}, nil
}
// Close closes the watcher.
func (w *Watcher) Close() error {
return w.watcher.Close()
}
// IgnoreNext ignores the next change on a path.
func (w *Watcher) IgnoreNext(path string) {
path = filepath.Clean(path)
w.ignoreNext[path] = true
}
// AddPath adds a new path to watch.
func (w *Watcher) AddPath(path string) error {
path = filepath.Clean(path)
w.paths[path] = true
info, err := os.Lstat(path)
if err != nil {
return err
}
if info.Mode().IsRegular() {
root := filepath.Dir(path)
if w.dirs[root] {
return nil
}
if err := w.watcher.Add(root); err != nil {
return err
}
w.dirs[root] = true
} else if info.Mode().IsDir() && w.recursive {
return fs.WalkDir(os.DirFS("."), path, func(path string, d fs.DirEntry, err error) error {
if err != nil {
return err
}
if d.IsDir() {
if w.dirs[path] {
return fs.SkipDir
}
if err := w.watcher.Add(path); err != nil {
return err
}
w.dirs[path] = true
}
return nil
})
}
return nil
}
// Run watches for file changes.
func (w *Watcher) Run() chan string {
files := make(chan string, 10)
go func() {
changetimes := map[string]time.Time{}
// prevent reminifying the first time for files with input==output
for path := range w.paths {
if info, err := os.Lstat(path); err == nil && info.Mode().IsRegular() {
changetimes[path] = time.Now()
}
}
for w.watcher.Events != nil && w.watcher.Errors != nil {
select {
case event, ok := <-w.watcher.Events:
if !ok {
w.watcher.Events = nil
break
}
filename := filepath.Clean(event.Name)
if w.ignoreNext[filename] {
w.ignoreNext[filename] = false
changetimes[filename] = time.Now()
continue
}
// check if changed file is being watched (as a file or indirectly in a dir)
watched := false
for path := range w.paths {
if !IsDir(path) {
if path == filename {
watched = true
break
}
} else if _, err := filepath.Rel(path, filename); err == nil {
watched = true
break
}
}
if !watched {
break
}
if info, err := os.Lstat(filename); err == nil {
if info.Mode().IsDir() && w.recursive {
if event.Op&fsnotify.Create == fsnotify.Create {
if err := w.AddPath(filename); err != nil {
Error.Println(err)
}
}
} else if info.Mode().IsRegular() {
if event.Op&fsnotify.Write == fsnotify.Write {
if t, ok := changetimes[filename]; !ok || 100*time.Millisecond < time.Since(t) {
time.Sleep(100 * time.Millisecond) // wait to make sure write is finished
files <- event.Name
changetimes[filename] = time.Now()
}
}
}
}
case err, ok := <-w.watcher.Errors:
if !ok {
w.watcher.Errors = nil
break
}
Error.Println(err)
}
}
close(files)
}()
return files
}
|
