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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
package fzf
import (
"bufio"
"context"
"io"
"os"
"os/exec"
"path/filepath"
"sync"
"sync/atomic"
"time"
"github.com/charlievieth/fastwalk"
"github.com/junegunn/fzf/src/util"
)
// Reader reads from command or standard input
type Reader struct {
pusher func([]byte) bool
eventBox *util.EventBox
delimNil bool
event int32
finChan chan bool
mutex sync.Mutex
exec *exec.Cmd
command *string
killed bool
wait bool
}
// NewReader returns new Reader object
func NewReader(pusher func([]byte) bool, eventBox *util.EventBox, delimNil bool, wait bool) *Reader {
return &Reader{pusher, eventBox, delimNil, int32(EvtReady), make(chan bool, 1), sync.Mutex{}, nil, nil, false, wait}
}
func (r *Reader) startEventPoller() {
go func() {
ptr := &r.event
pollInterval := readerPollIntervalMin
for {
if atomic.CompareAndSwapInt32(ptr, int32(EvtReadNew), int32(EvtReady)) {
r.eventBox.Set(EvtReadNew, (*string)(nil))
pollInterval = readerPollIntervalMin
} else if atomic.LoadInt32(ptr) == int32(EvtReadFin) {
if r.wait {
r.finChan <- true
}
return
} else {
pollInterval += readerPollIntervalStep
if pollInterval > readerPollIntervalMax {
pollInterval = readerPollIntervalMax
}
}
time.Sleep(pollInterval)
}
}()
}
func (r *Reader) fin(success bool) {
atomic.StoreInt32(&r.event, int32(EvtReadFin))
if r.wait {
<-r.finChan
}
r.mutex.Lock()
ret := r.command
if success || r.killed {
ret = nil
}
r.mutex.Unlock()
r.eventBox.Set(EvtReadFin, ret)
}
func (r *Reader) terminate() {
r.mutex.Lock()
r.killed = true
if r.exec != nil && r.exec.Process != nil {
util.KillCommand(r.exec)
} else {
os.Stdin.Close()
}
r.mutex.Unlock()
}
func (r *Reader) restart(command string) {
r.event = int32(EvtReady)
r.startEventPoller()
success := r.readFromCommand(command)
r.fin(success)
}
// ReadSource reads data from the default command or from standard input
func (r *Reader) ReadSource() {
r.startEventPoller()
var success bool
if util.IsTty() {
cmd := os.Getenv("FZF_DEFAULT_COMMAND")
if len(cmd) == 0 {
success = r.readFiles()
} else {
success = r.readFromCommand(cmd)
}
} else {
success = r.readFromStdin()
}
r.fin(success)
}
func (r *Reader) feed(src io.Reader) {
delim := byte('\n')
if r.delimNil {
delim = '\000'
}
reader := bufio.NewReaderSize(src, readerBufferSize)
for {
// ReadBytes returns err != nil if and only if the returned data does not
// end in delim.
bytea, err := reader.ReadBytes(delim)
byteaLen := len(bytea)
if byteaLen > 0 {
if err == nil {
// get rid of carriage return if under Windows:
if util.IsWindows() && byteaLen >= 2 && bytea[byteaLen-2] == byte('\r') {
bytea = bytea[:byteaLen-2]
} else {
bytea = bytea[:byteaLen-1]
}
}
if r.pusher(bytea) {
atomic.StoreInt32(&r.event, int32(EvtReadNew))
}
}
if err != nil {
break
}
}
}
func (r *Reader) readFromStdin() bool {
r.feed(os.Stdin)
return true
}
func (r *Reader) readFiles() bool {
r.killed = false
conf := fastwalk.Config{Follow: true}
fn := func(path string, de os.DirEntry, err error) error {
if err != nil {
return nil
}
path = filepath.Clean(path)
if path != "." {
isDir := de.IsDir()
if isDir && filepath.Base(path)[0] == '.' {
return filepath.SkipDir
}
if !isDir && r.pusher([]byte(path)) {
atomic.StoreInt32(&r.event, int32(EvtReadNew))
}
}
r.mutex.Lock()
defer r.mutex.Unlock()
if r.killed {
return context.Canceled
}
return nil
}
return fastwalk.Walk(&conf, ".", fn) == nil
}
func (r *Reader) readFromCommand(command string) bool {
r.mutex.Lock()
r.killed = false
r.command = &command
r.exec = util.ExecCommand(command, true)
out, err := r.exec.StdoutPipe()
if err != nil {
r.mutex.Unlock()
return false
}
err = r.exec.Start()
r.mutex.Unlock()
if err != nil {
return false
}
r.feed(out)
return r.exec.Wait() == nil
}
|
