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
|
package tui
import (
"os"
"os/signal"
"zgo.at/termfo"
"zgo.at/termfo/keys"
"strings"
"strconv"
"bufio"
"syscall"
"sync"
)
type Event struct {
TextInput rune
Key keys.Key
Mouse MouseEvent
Err error
Resize bool
}
type MouseEvent struct {
Button int
Pressed bool
Released bool
X, Y int
Scroll int
}
var (
evChan chan Event = make(chan Event, 1)
lastEvent chan Event = make(chan Event, 1)
once sync.Once
)
func Events() <-chan Event {
once.Do(func() {
ch := terminfo.FindKeys(bufio.NewReader(os.Stdin))
go readKeys(ch, evChan)
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGWINCH)
go func() {
for _ = range sigs {
sendEvent(Event {Resize: true})
}
}()
})
return evChan
}
func sendEvent(ev Event) {
select {
case lastEvent <- ev:
default:
}
evChan <- ev
}
func getLastEvent() Event {
var ev Event
select {
case ev = <-lastEvent:
default:
}
return ev
}
func readKeys(ch <-chan termfo.Event, evChan chan<- Event) {
var pasting bool
for kev := range ch {
var ev Event
if kev.Err != nil {
ev.Err = kev.Err
sendEvent(ev)
return
}
noMods := kev.Key & (keys.Ctrl | keys.Alt) == 0
notSpecial := kev.Key.WithoutMods() < (1 << 32)
if noMods && notSpecial {
r := rune(kev.Key.WithoutMods())
if kev.Key & keys.Shift != 0 && r >= 'a' && r <= 'z' {
r -= 0x20
}
ev.TextInput = r
}
switch kev.Key {
case keys.Mouse:
if err := parseMouse(&ev, ch); err != nil {
ev.Err = err
sendEvent(ev)
return
}
default:
ev.Key = kev.Key
}
if string(kev.Seq) == "\033[200~" {
pasting = true
}
if pasting {
switch kev.Seq[0] {
case '\n', '\t':
ev.TextInput = rune(kev.Seq[0])
}
ev.Key = 0
}
if string(kev.Seq) == "\033[201~" {
pasting = false
}
sendEvent(ev)
}
}
func parseMouse(ev *Event, ch <-chan termfo.Event) error {
var (
arg strings.Builder
args []int
down bool
)
parse: for kev := range ch {
if kev.Err != nil {
return kev.Err
}
switch {
case kev.Key >= '0' && kev.Key <= '9':
arg.WriteRune(rune(kev.Key))
case kev.Key == ';':
i, _ := strconv.Atoi(arg.String())
args = append(args, i)
arg.Reset()
case kev.Key == 'm' | keys.Shift:
down = true
fallthrough
default:
i, _ := strconv.Atoi(arg.String())
args = append(args, i)
break parse
}
}
if len(args) != 3 {
return nil
}
ev.Mouse.X = args[1] - 1
ev.Mouse.Y = args[2] - 1
switch args[0] {
case 64:
ev.Mouse.Scroll = -1
case 65:
ev.Mouse.Scroll = 1
default:
ev.Mouse.Button = args[0]
ev.Mouse.Pressed = down
ev.Mouse.Released = !down
}
return nil
}
|
