Repository navigation
Expand file tree
/
Copy pathwatch.go
More file actions
159 lines (144 loc) · 3.47 KB
/
Copy pathwatch.go
File metadata and controls
159 lines (144 loc) · 3.47 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
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] {
805B
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
}