112 lines
2.2 KiB
Go
112 lines
2.2 KiB
Go
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// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package fsnotify implements file system notification.
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package fsnotify
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import "fmt"
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const (
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FSN_CREATE = 1
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FSN_MODIFY = 2
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FSN_DELETE = 4
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FSN_RENAME = 8
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FSN_ALL = FSN_MODIFY | FSN_DELETE | FSN_RENAME | FSN_CREATE
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)
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// Purge events from interal chan to external chan if passes filter
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func (w *Watcher) purgeEvents() {
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for ev := range w.internalEvent {
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sendEvent := false
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w.fsnmut.Lock()
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fsnFlags := w.fsnFlags[ev.Name]
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w.fsnmut.Unlock()
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if (fsnFlags&FSN_CREATE == FSN_CREATE) && ev.IsCreate() {
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sendEvent = true
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}
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if (fsnFlags&FSN_MODIFY == FSN_MODIFY) && ev.IsModify() {
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sendEvent = true
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}
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if (fsnFlags&FSN_DELETE == FSN_DELETE) && ev.IsDelete() {
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sendEvent = true
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}
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if (fsnFlags&FSN_RENAME == FSN_RENAME) && ev.IsRename() {
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sendEvent = true
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}
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if sendEvent {
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w.Event <- ev
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}
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// If there's no file, then no more events for user
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// BSD must keep watch for internal use (watches DELETEs to keep track
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// what files exist for create events)
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if ev.IsDelete() {
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w.fsnmut.Lock()
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delete(w.fsnFlags, ev.Name)
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w.fsnmut.Unlock()
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}
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}
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close(w.Event)
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}
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// Watch a given file path
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func (w *Watcher) Watch(path string) error {
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return w.WatchFlags(path, FSN_ALL)
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}
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// Watch a given file path for a particular set of notifications (FSN_MODIFY etc.)
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func (w *Watcher) WatchFlags(path string, flags uint32) error {
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w.fsnmut.Lock()
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w.fsnFlags[path] = flags
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w.fsnmut.Unlock()
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return w.watch(path)
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}
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// Remove a watch on a file
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func (w *Watcher) RemoveWatch(path string) error {
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w.fsnmut.Lock()
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delete(w.fsnFlags, path)
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w.fsnmut.Unlock()
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return w.removeWatch(path)
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}
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// String formats the event e in the form
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// "filename: DELETE|MODIFY|..."
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func (e *FileEvent) String() string {
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var events string = ""
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if e.IsCreate() {
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events += "|" + "CREATE"
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}
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if e.IsDelete() {
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events += "|" + "DELETE"
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}
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if e.IsModify() {
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events += "|" + "MODIFY"
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}
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if e.IsRename() {
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events += "|" + "RENAME"
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}
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if e.IsAttrib() {
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events += "|" + "ATTRIB"
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}
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if len(events) > 0 {
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events = events[1:]
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}
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return fmt.Sprintf("%q: %s", e.Name, events)
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}
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