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
|
package gui
import (
"os"
"path/filepath"
"github.com/fsnotify/fsnotify"
"github.com/jesseduffield/lazygit/pkg/commands"
"github.com/sirupsen/logrus"
)
// macs for some bizarre reason cap the number of watchable files to 256.
// there's no obvious platform agonstic way to check the situation of the user's
// computer so we're just arbitrarily capping at 200. This isn't so bad because
// file watching is only really an added bonus for faster refreshing.
const MAX_WATCHED_FILES = 50
type fileWatcher struct {
Watcher *fsnotify.Watcher
WatchedFilenames []string
Log *logrus.Entry
}
func NewFileWatcher(log *logrus.Entry) *fileWatcher {
watcher, err := fsnotify.NewWatcher()
if err != nil {
log.Error(err)
return nil
}
return &fileWatcher{
Watcher: watcher,
Log: log,
WatchedFilenames: make([]string, 0, MAX_WATCHED_FILES),
}
}
func (w *fileWatcher) watchingFilename(filename string) bool {
for _, watchedFilename := range w.WatchedFilenames {
if watchedFilename == filename {
return true
}
}
return false
}
func (w *fileWatcher) popOldestFilename() {
// shift the last off the array to make way for this one
oldestFilename := w.WatchedFilenames[0]
w.WatchedFilenames = w.WatchedFilenames[1:]
if err := w.Watcher.Remove(oldestFilename); err != nil {
// swallowing errors here because it doesn't really matter if we can't unwatch a file
w.Log.Warn(err)
}
}
func (w *fileWatcher) watchFilename(filename string) {
w.Log.Warn(filename)
if err := w.Watcher.Add(filename); err != nil {
// swallowing errors here because it doesn't really matter if we can't watch a file
w.Log.Warn(err)
}
// assume we're watching it now to be safe
w.WatchedFilenames = append(w.WatchedFilenames, filename)
}
func (w *fileWatcher) addFilesToFileWatcher(files []*commands.File) error {
if len(files) == 0 {
return nil
}
// watch the files for changes
dirName, err := os.Getwd()
if err != nil {
return err
}
for _, file := range files[0:min(MAX_WATCHED_FILES, len(files))] {
if file.Deleted {
continue
}
filename := filepath.Join(dirName, file.Name)
if w.watchingFilename(filename) {
continue
}
if len(w.WatchedFilenames) > MAX_WATCHED_FILES {
w.popOldestFilename()
}
w.watchFilename(filename)
}
return nil
}
func min(a int, b int) int {
if a < b {
return a
}
return b
}
// NOTE: given that we often edit files ourselves, this may make us end up refreshing files too often
// TODO: consider watching the whole directory recursively (could be more expensive)
func (gui *Gui) watchFilesForChanges() {
gui.fileWatcher = NewFileWatcher(gui.Log)
if gui.fileWatcher == nil {
return
}
go func() {
for {
select {
// watch for events
case event := <-gui.fileWatcher.Watcher.Events:
if event.Op == fsnotify.Chmod {
// for some reason we pick up chmod events when they don't actually happen
continue
}
// only refresh if we're not already
if !gui.State.IsRefreshingFiles {
if err := gui.refreshFiles(); err != nil {
err = gui.createErrorPanel(gui.g, err.Error())
if err != nil {
gui.Log.Error(err)
}
}
}
// watch for errors
case err := <-gui.fileWatcher.Watcher.Errors:
if err != nil {
gui.Log.Warn(err)
}
}
}
}()
}
|