85 lines
2.6 KiB
Go
85 lines
2.6 KiB
Go
// Copyright (c) 2014-2015 The Notify Authors. All rights reserved.
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// Use of this source code is governed by the MIT license that can be
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// found in the LICENSE file.
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// +build linux
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package notify_test
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import (
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"log"
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"golang.org/x/sys/unix"
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"github.com/rjeczalik/notify"
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)
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// This example shows how to watch changes made on file-system by text editor
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// when saving a file. Usually, either InCloseWrite or InMovedTo (when swapping
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// with a temporary file) event is created.
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func ExampleWatch_linux() {
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// Make the channel buffered to ensure no event is dropped. Notify will drop
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// an event if the receiver is not able to keep up the sending pace.
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c := make(chan notify.EventInfo, 1)
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// Set up a watchpoint listening for inotify-specific events within a
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// current working directory. Dispatch each InCloseWrite and InMovedTo
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// events separately to c.
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if err := notify.Watch(".", c, notify.InCloseWrite, notify.InMovedTo); err != nil {
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log.Fatal(err)
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}
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defer notify.Stop(c)
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// Block until an event is received.
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switch ei := <-c; ei.Event() {
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case notify.InCloseWrite:
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log.Println("Editing of", ei.Path(), "file is done.")
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case notify.InMovedTo:
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log.Println("File", ei.Path(), "was swapped/moved into the watched directory.")
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}
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}
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// This example shows how to use Sys() method from EventInfo interface to tie
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// two separate events generated by rename(2) function.
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func ExampleWatch_linuxMove() {
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// Make the channel buffered to ensure no event is dropped. Notify will drop
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// an event if the receiver is not able to keep up the sending pace.
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c := make(chan notify.EventInfo, 2)
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// Set up a watchpoint listening for inotify-specific events within a
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// current working directory. Dispatch each InMovedFrom and InMovedTo
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// events separately to c.
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if err := notify.Watch(".", c, notify.InMovedFrom, notify.InMovedTo); err != nil {
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log.Fatal(err)
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}
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defer notify.Stop(c)
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// Inotify reports move filesystem action by sending two events tied with
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// unique cookie value (uint32): one of the events is of InMovedFrom type
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// carrying move source path, while the second one is of InMoveTo type
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// carrying move destination path.
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moves := make(map[uint32]struct {
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From string
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To string
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})
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// Wait for moves.
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for ei := range c {
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cookie := ei.Sys().(*unix.InotifyEvent).Cookie
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info := moves[cookie]
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switch ei.Event() {
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case notify.InMovedFrom:
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info.From = ei.Path()
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case notify.InMovedTo:
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info.To = ei.Path()
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}
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moves[cookie] = info
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if cookie != 0 && info.From != "" && info.To != "" {
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log.Println("File:", info.From, "was renamed to", info.To)
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delete(moves, cookie)
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}
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}
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}
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