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
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
|
package widgets
import (
gocolor "image/color"
"os"
"os/exec"
"git.sr.ht/~sircmpwn/aerc2/lib/ui"
"git.sr.ht/~sircmpwn/go-libvterm"
"github.com/gdamore/tcell"
"github.com/kr/pty"
)
type Terminal struct {
closed bool
cmd *exec.Cmd
colors map[tcell.Color]tcell.Color
ctx *ui.Context
cursorPos vterm.Pos
cursorShown bool
damage []vterm.Rect
err error
focus bool
onInvalidate func(d ui.Drawable)
pty *os.File
start chan interface{}
vterm *vterm.VTerm
OnClose func(err error)
OnTitle func(title string)
}
func NewTerminal(cmd *exec.Cmd) (*Terminal, error) {
term := &Terminal{}
term.cmd = cmd
term.vterm = vterm.New(24, 80)
term.vterm.SetUTF8(true)
term.start = make(chan interface{})
go func() {
<-term.start
buf := make([]byte, 2048)
for {
n, err := term.pty.Read(buf)
if err != nil {
term.Close(err)
}
n, err = term.vterm.Write(buf[:n])
if err != nil {
term.Close(err)
}
term.Invalidate()
}
}()
screen := term.vterm.ObtainScreen()
screen.OnDamage = term.onDamage
screen.OnMoveCursor = term.onMoveCursor
screen.OnSetTermProp = term.onSetTermProp
screen.Reset(true)
state := term.vterm.ObtainState()
term.colors = make(map[tcell.Color]tcell.Color)
for i := 0; i < 256; i += 1 {
tcolor := tcell.Color(i)
var r uint8 = 0
var g uint8 = 0
var b uint8 = uint8(i + 1)
if i < 16 {
// Set the first 16 colors to predictable near-black RGB values
state.SetPaletteColor(i,
vterm.NewVTermColorRGB(gocolor.RGBA{r, g, b, 255}))
} else {
// The rest use RGB
vcolor := state.GetPaletteColor(i)
r, g, b = vcolor.GetRGB()
}
term.colors[tcell.NewRGBColor(int32(r), int32(g), int32(b))] = tcolor
}
fg, bg := state.GetDefaultColors()
r, g, b := bg.GetRGB()
term.colors[tcell.NewRGBColor(
int32(r), int32(g), int32(b))] = tcell.ColorDefault
r, g, b = fg.GetRGB()
term.colors[tcell.NewRGBColor(
int32(r), int32(g), int32(b))] = tcell.ColorDefault
return term, nil
}
func (term *Terminal) Close(err error) {
term.err = err
if term.vterm != nil {
term.vterm.Close()
term.vterm = nil
}
if term.pty != nil {
term.pty.Close()
term.pty = nil
}
if term.cmd != nil && term.cmd.Process != nil {
term.cmd.Process.Kill()
term.cmd = nil
}
if !term.closed && term.OnClose != nil {
term.OnClose(err)
}
term.closed = true
}
func (term *Terminal) OnInvalidate(cb func(d ui.Drawable)) {
term.onInvalidate = cb
}
func (term *Terminal) Invalidate() {
if term.onInvalidate != nil {
term.onInvalidate(term)
}
}
func (term *Terminal) Draw(ctx *ui.Context) {
if term.closed {
if term.err != nil {
ui.NewText(term.err.Error()).Strategy(ui.TEXT_CENTER).Draw(ctx)
} else {
ui.NewText("Terminal closed").Strategy(ui.TEXT_CENTER).Draw(ctx)
}
return
}
winsize := pty.Winsize{
Cols: uint16(ctx.Width()),
Rows: uint16(ctx.Height()),
}
if term.pty == nil {
term.vterm.SetSize(ctx.Height(), ctx.Width())
tty, err := pty.StartWithSize(term.cmd, &winsize)
term.pty = tty
if err != nil {
term.Close(err)
return
}
term.start <- nil
}
term.ctx = ctx // gross
rows, cols, err := pty.Getsize(term.pty)
if err != nil {
return
}
if ctx.Width() != cols || ctx.Height() != rows {
pty.Setsize(term.pty, &winsize)
term.vterm.SetSize(ctx.Height(), ctx.Width())
return
}
screen := term.vterm.ObtainScreen()
screen.Flush()
type coords struct {
x int
y int
}
// naive optimization
visited := make(map[coords]interface{})
for _, rect := range term.damage {
for x := rect.StartCol(); x < rect.EndCol() && x < ctx.Width(); x += 1 {
for y := rect.StartCol(); y < rect.EndCol() && y < ctx.Height(); y += 1 {
coords := coords{x, y}
if _, ok := visited[coords]; ok {
continue
}
visited[coords] = nil
cell, err := screen.GetCellAt(y, x)
if err != nil {
continue
}
style := term.styleFromCell(cell)
ctx.Printf(x, y, style, "%s", string(cell.Chars()))
}
}
}
}
func (term *Terminal) Focus(focus bool) {
term.focus = focus
term.resetCursor()
}
func (term *Terminal) Event(event tcell.Event) bool {
return false
}
func (term *Terminal) styleFromCell(cell *vterm.ScreenCell) tcell.Style {
style := tcell.StyleDefault
background := cell.Bg()
r, g, b := background.GetRGB()
bg := tcell.NewRGBColor(int32(r), int32(g), int32(b))
foreground := cell.Fg()
r, g, b = foreground.GetRGB()
fg := tcell.NewRGBColor(int32(r), int32(g), int32(b))
if color, ok := term.colors[bg]; ok {
style = style.Background(color)
} else {
style = style.Background(bg)
}
if color, ok := term.colors[fg]; ok {
style = style.Foreground(color)
} else {
style = style.Foreground(fg)
}
if cell.Attrs().Bold != 0 {
style = style.Bold(true)
}
if cell.Attrs().Underline != 0 {
style = style.Underline(true)
}
if cell.Attrs().Blink != 0 {
style = style.Blink(true)
}
if cell.Attrs().Reverse != 0 {
style = style.Reverse(true)
}
return style
}
func (term *Terminal) onDamage(rect *vterm.Rect) int {
term.damage = append(term.damage, *rect)
term.Invalidate()
return 1
}
func (term *Terminal) resetCursor() {
if term.ctx != nil && term.focus {
if !term.cursorShown {
term.ctx.HideCursor()
} else {
term.ctx.SetCursor(term.cursorPos.Col(), term.cursorPos.Row())
}
}
}
func (term *Terminal) onMoveCursor(old *vterm.Pos,
pos *vterm.Pos, visible bool) int {
term.cursorShown = visible
term.cursorPos = *pos
term.resetCursor()
return 1
}
func (term *Terminal) onSetTermProp(prop int, val *vterm.VTermValue) int {
switch prop {
case vterm.VTERM_PROP_TITLE:
if term.OnTitle != nil {
term.OnTitle(val.String)
}
}
return 1
}
|
