package widgets
import (
gocolor "image/color"
"os"
"os/exec"
"git.sr.ht/~sircmpwn/aerc/lib/ui"
"git.sr.ht/~sircmpwn/go-libvterm"
"git.sr.ht/~sircmpwn/pty"
"github.com/gdamore/tcell"
)
type vtermKey struct {
Key vterm.Key
Rune rune
Mod vterm.Modifier
}
var keyMap map[tcell.Key]vtermKey
func directKey(key vterm.Key) vtermKey {
return vtermKey{key, 0, vterm.ModNone}
}
func runeMod(r rune, mod vterm.Modifier) vtermKey {
return vtermKey{vterm.KeyNone, r, mod}
}
func keyMod(key vterm.Key, mod vterm.Modifier) vtermKey {
return vtermKey{key, 0, mod}
}
func init() {
keyMap = make(map[tcell.Key]vtermKey)
keyMap[tcell.KeyCtrlSpace] = runeMod(' ', vterm.ModCtrl)
keyMap[tcell.KeyCtrlA] = runeMod('a', vterm.ModCtrl)
keyMap[tcell.KeyCtrlB] = runeMod('b', vterm.ModCtrl)
keyMap[tcell.KeyCtrlC] = runeMod('c', vterm.ModCtrl)
keyMap[tcell.KeyCtrlD] = runeMod('d', vterm.ModCtrl)
keyMap[tcell.KeyCtrlE] = runeMod('e', vterm.ModCtrl)
keyMap[tcell.KeyCtrlF] = runeMod('f', vterm.ModCtrl)
keyMap[tcell.KeyCtrlG] = runeMod('g', vterm.ModCtrl)
keyMap[tcell.KeyCtrlH] = runeMod('h', vterm.ModCtrl)
keyMap[tcell.KeyCtrlI] = runeMod('i', vterm.ModCtrl)
keyMap[tcell.KeyCtrlJ] = runeMod('j', vterm.ModCtrl)
keyMap[tcell.KeyCtrlK] = runeMod('k', vterm.ModCtrl)
keyMap[tcell.KeyCtrlL] = runeMod('l', vterm.ModCtrl)
keyMap[tcell.KeyCtrlM] = runeMod('m', vterm.ModCtrl)
keyMap[tcell.KeyCtrlN] = runeMod('n', vterm.ModCtrl)
keyMap[tcell.KeyCtrlO] = runeMod('o', vterm.ModCtrl)
keyMap[tcell.KeyCtrlP] = runeMod('p', vterm.ModCtrl)
keyMap[tcell.KeyCtrlQ] = runeMod('q', vterm.ModCtrl)
keyMap[tcell.KeyCtrlR] = runeMod('r', vterm.ModCtrl)
keyMap[tcell.KeyCtrlS] = runeMod('s', vterm.ModCtrl)
keyMap[tcell.KeyCtrlT] = runeMod('t', vterm.ModCtrl)
keyMap[tcell.KeyCtrlU] = runeMod('u', vterm.ModCtrl)
keyMap[tcell.KeyCtrlV] = runeMod('v', vterm.ModCtrl)
keyMap[tcell.KeyCtrlW] = runeMod('w', vterm.ModCtrl)
keyMap[tcell.KeyCtrlX] = runeMod('x', vterm.ModCtrl)
keyMap[tcell.KeyCtrlY] = runeMod('y', vterm.ModCtrl)
keyMap[tcell.KeyCtrlZ] = runeMod('z', vterm.ModCtrl)
keyMap[tcell.KeyCtrlBackslash] = runeMod('\\', vterm.ModCtrl)
keyMap[tcell.KeyCtrlCarat] = runeMod('^', vterm.ModCtrl)
keyMap[tcell.KeyCtrlUnderscore] = runeMod('_', vterm.ModCtrl)
keyMap[tcell.KeyEnter] = directKey(vterm.KeyEnter)
keyMap[tcell.KeyTab] = directKey(vterm.KeyTab)
keyMap[tcell.KeyBackspace] = directKey(vterm.KeyBackspace)
keyMap[tcell.KeyEscape] = directKey(vterm.KeyEscape)
keyMap[tcell.KeyUp] = directKey(vterm.KeyUp)
keyMap[tcell.KeyDown] = directKey(vterm.KeyDown)
keyMap[tcell.KeyLeft] = directKey(vterm.KeyLeft)
keyMap[tcell.KeyRight] = directKey(vterm.KeyRight)
keyMap[tcell.KeyInsert] = directKey(vterm.KeyIns)
keyMap[tcell.KeyDelete] = directKey(vterm.KeyDel)
keyMap[tcell.KeyHome] = directKey(vterm.KeyHome)
keyMap[tcell.KeyEnd] = directKey(vterm.KeyEnd)
keyMap[tcell.KeyPgUp] = directKey(vterm.KeyPageUp)
keyMap[tcell.KeyPgDn] = directKey(vterm.KeyPageDown)
for i := 0; i < 64; i++ {
keyMap[tcell.Key(int(tcell.KeyF1)+i)] =
directKey(vterm.Key(int(vterm.KeyFunction0) + i))
}
keyMap[tcell.KeyTAB] = directKey(vterm.KeyTab)
keyMap[tcell.KeyESC] = directKey(vterm.KeyEscape)
keyMap[tcell.KeyDEL] = directKey(vterm.KeyBackspace)
}
type Terminal struct {
ui.Invalidatable
closed bool
cmd *exec.Cmd
colors map[tcell.Color]tcell.Color
ctx *ui.Context
cursorPos vterm.Pos
cursorShown bool
damage []vterm.Rect
destroyed bool
err error
focus bool
pty *os.File
start chan interface{}
vterm *vterm.VTerm
OnClose func(err error)
OnEvent func(event tcell.Event) bool
OnStart func()
OnTitle func(title string)
}
func NewTerminal(cmd *exec.Cmd) (*Terminal, error) {
term := &Terminal{
cursorShown: true,
}
term.cmd = cmd
term.vterm = vterm.New(24, 80)
term.vterm.SetUTF8(true)
term.start = make(chan interface{})
screen := term.vterm.ObtainScreen()
go func() {
<-term.start
buf := make([]byte, 4096)
for {
n, err := term.pty.Read(buf)
if err != nil || term.closed {
// These are generally benine errors when the process exits
term.Close(nil)
return
}
n, err = term.vterm.Write(buf[:n])
if err != nil {
term.Close(err)
return
}
screen.Flush()
term.flushTerminal()
term.invalidate()
}
}()
screen.OnDamage = term.onDamage
screen.OnMoveCursor = term.onMoveCursor
screen.OnSetTermProp = term.onSetTermProp
screen.EnableAltScreen(true)
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) flushTerminal() {
buf := make([]byte, 4096)
for {
n, err := term.vterm.Read(buf)
if err != nil {
term.Close(err)
return
}
if n == 0 {
break
}
n, err = term.pty.Write(buf[:n])
if err != nil {
term.Close(err)
return
}
}
}
func (term *Terminal) Close(err error) {
if term.closed {
return
}
term.err = err
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
term.ctx.HideCursor()
}
func (term *Terminal) Destroy() {
if term.destroyed {
return
}
if term.vterm != nil {
term.vterm.Close()
term.vterm = nil
}
if term.ctx != nil {
term.ctx.HideCursor()
}
term.destroyed = true
}
func (term *Terminal) Invalidate() {
if term.vterm != nil {
width, height := term.vterm.Size()
rect := vterm.NewRect(0, width, 0, height)
term.damage = append(term.damage, *rect)
}
term.invalidate()
}
func (term *Terminal) invalidate() {
term.DoInvalidate(term)
}
func (term *Terminal) Draw(ctx *ui.Context) {
if term.destroyed {
return
}
term.ctx = ctx // gross
if !term.closed {
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
if term.OnStart != nil {
term.OnStart()
}
}
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())
rect := vterm.NewRect(0, ctx.Width(), 0, ctx.Height())
term.damage = append(term.damage, *rect)
return
}
}
screen := term.vterm.ObtainScreen()
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.StartRow(); y < rect.EndRow() && 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()))
}
}
}
term.damage = nil
if term.focus && !term.closed {
if !term.cursorShown {
ctx.HideCursor()
} else {
state := term.vterm.ObtainState()
row, col := state.GetCursorPos()
ctx.SetCursor(col, row)
}
}
}
func (term *Terminal) Focus(focus bool) {
if term.closed {
return
}
term.focus = focus
if term.ctx != nil {
if !term.focus {
term.ctx.HideCursor()
} else {
state := term.vterm.ObtainState()
row, col := state.GetCursorPos()
term.ctx.SetCursor(col, row)
term.Invalidate()
}
}
}
func convertMods(mods tcell.ModMask) vterm.Modifier {
var (
ret uint = 0
mask uint = uint(mods)
)
if mask&uint(tcell.ModShift) > 0 {
ret |= uint(vterm.ModShift)
}
if mask&uint(tcell.ModCtrl) > 0 {
ret |= uint(vterm.ModCtrl)
}
if mask&uint(tcell.ModAlt) > 0 {
ret |= uint(vterm.ModAlt)
}
return vterm.Modifier(ret)
}
func (term *Terminal) Event(event tcell.Event) bool {
if term.OnEvent != nil {
if term.OnEvent(event) {
return true
}
}
if term.closed {
return false
}
switch event := event.(type) {
case *tcell.EventKey:
if event.Key() == tcell.KeyRune {
term.vterm.KeyboardUnichar(
event.Rune(), convertMods(event.Modifiers()))
} else {
if key, ok := keyMap[event.Key()]; ok {
if key.Key == vterm.KeyNone {
term.vterm.KeyboardUnichar(
key.Rune, key.Mod)
} else if key.Mod == vterm.ModNone {
term.vterm.KeyboardKey(key.Key,
convertMods(event.Modifiers()))
} else {
term.vterm.KeyboardKey(key.Key, key.Mod)
}
}
}
term.flushTerminal()
}
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) onMoveCursor(old *vterm.Pos,
pos *vterm.Pos, visible bool) int {
rows, cols, _ := pty.Getsize(term.pty)
if pos.Row() >= rows || pos.Col() >= cols {
return 1
}
term.cursorPos = *pos
term.invalidate()
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)
}
case vterm.VTERM_PROP_CURSORVISIBLE:
term.cursorShown = val.Boolean
term.invalidate()
}
return 1
}