forked from chzyer/readline
/
terminal.go
132 lines (115 loc) · 2.17 KB
/
terminal.go
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
package readline
import (
"bufio"
"fmt"
"os"
"sync"
"sync/atomic"
"syscall"
"golang.org/x/crypto/ssh/terminal"
)
type Terminal struct {
cfg *Config
state *terminal.State
outchan chan rune
closed int64
stopChan chan struct{}
kickChan chan struct{}
wg sync.WaitGroup
isReading int64
}
func NewTerminal(cfg *Config) (*Terminal, error) {
state, err := MakeRaw(syscall.Stdin)
if err != nil {
return nil, err
}
t := &Terminal{
cfg: cfg,
state: state,
kickChan: make(chan struct{}, 1),
outchan: make(chan rune),
stopChan: make(chan struct{}, 1),
}
go t.ioloop()
return t, nil
}
func (t *Terminal) Write(b []byte) (int, error) {
return os.Stdout.Write(b)
}
func (t *Terminal) Print(s string) {
fmt.Fprintf(os.Stdout, "%s", s)
}
func (t *Terminal) PrintRune(r rune) {
fmt.Fprintf(os.Stdout, "%c", r)
}
func (t *Terminal) Readline() *Operation {
return NewOperation(t, t.cfg)
}
func (t *Terminal) ReadRune() rune {
return <-t.outchan
}
func (t *Terminal) IsReading() bool {
return atomic.LoadInt64(&t.isReading) == 1
}
func (t *Terminal) KickRead() {
select {
case t.kickChan <- struct{}{}:
default:
}
}
func (t *Terminal) ioloop() {
t.wg.Add(1)
defer t.wg.Done()
var (
isEscape bool
isEscapeEx bool
expectNextChar bool
)
buf := bufio.NewReader(os.Stdin)
for {
if !expectNextChar {
atomic.StoreInt64(&t.isReading, 0)
select {
case <-t.kickChan:
atomic.StoreInt64(&t.isReading, 1)
case <-t.stopChan:
return
}
}
expectNextChar = false
r, _, err := buf.ReadRune()
if err != nil {
break
}
if isEscape {
isEscape = false
if r == CharEscapeEx {
expectNextChar = true
isEscapeEx = true
continue
}
r = escapeKey(r)
} else if isEscapeEx {
isEscapeEx = false
r = escapeExKey(r)
}
expectNextChar = true
switch r {
case CharEsc:
isEscape = true
case CharInterrupt, CharEnter, CharCtrlJ:
expectNextChar = false
fallthrough
default:
t.outchan <- r
}
}
}
func (t *Terminal) Close() error {
if atomic.SwapInt64(&t.closed, 1) != 0 {
return nil
}
t.stopChan <- struct{}{}
t.wg.Wait()
return Restore(syscall.Stdin, t.state)
}