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68 lines
1.5 KiB
68 lines
1.5 KiB
// 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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// +build !plan9
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// Package fsnotify provides a platform-independent interface for file system notifications.
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package fsnotify
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import (
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"bytes"
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"errors"
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"fmt"
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)
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// Event represents a single file system notification.
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type Event struct {
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Name string // Relative path to the file or directory.
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Op Op // File operation that triggered the event.
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}
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// Op describes a set of file operations.
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type Op uint32
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// These are the generalized file operations that can trigger a notification.
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const (
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Create Op = 1 << iota
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Write
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Remove
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Rename
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Chmod
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)
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func (op Op) String() string {
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// Use a buffer for efficient string concatenation
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var buffer bytes.Buffer
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if op&Create == Create {
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buffer.WriteString("|CREATE")
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}
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if op&Remove == Remove {
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buffer.WriteString("|REMOVE")
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}
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if op&Write == Write {
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buffer.WriteString("|WRITE")
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}
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if op&Rename == Rename {
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buffer.WriteString("|RENAME")
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}
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if op&Chmod == Chmod {
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buffer.WriteString("|CHMOD")
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}
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if buffer.Len() == 0 {
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return ""
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}
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return buffer.String()[1:] // Strip leading pipe
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}
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// String returns a string representation of the event in the form
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// "file: REMOVE|WRITE|..."
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func (e Event) String() string {
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return fmt.Sprintf("%q: %s", e.Name, e.Op.String())
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}
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// Common errors that can be reported by a watcher
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var (
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ErrEventOverflow = errors.New("fsnotify queue overflow")
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)
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