package widgets
import (
"os"
"os/exec"
"sync"
"syscall"
"git.sr.ht/~rjarry/aerc/lib/ui"
"github.com/creack/pty"
vterm "github.com/ddevault/go-libvterm"
"github.com/gdamore/tcell/v2"
)
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.KeyBacktab] = keyMod(vterm.KeyTab, vterm.ModShift)
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 + 1))
}
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
ctx *ui.Context
cursorPos vterm.Pos
cursorShown bool
destroyed bool
err error
focus bool
pty *os.File
start chan interface{}
vterm *vterm.VTerm
damage []vterm.Rect // protected by damageMutex
damageMutex sync.Mutex
writeMutex sync.Mutex
readMutex sync.Mutex
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
}
term.writeMutex.Lock()
n, err = term.vterm.Write(buf[:n])
term.writeMutex.Unlock()
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)
return term, nil
}
func (term *Terminal) flushTerminal() {
buf := make([]byte, 4096)
for {
term.readMutex.Lock()
n, err := term.vterm.Read(buf)
term.readMutex.Unlock()
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.Wait()
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.damageMutex.Lock()
term.damage = append(term.damage, *rect)
term.damageMutex.Unlock()
}
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 winsize.Cols == 0 || winsize.Rows == 0 || term.cmd == nil {
return
}
if term.pty == nil {
term.vterm.SetSize(ctx.Height(), ctx.Width())
tty, err := pty.StartWithAttrs(term.cmd, &winsize, &syscall.SysProcAttr{Setsid: true, Setctty: true, Ctty: 1})
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 {
term.writeMutex.Lock()
pty.Setsize(term.pty, &winsize)
term.vterm.SetSize(ctx.Height(), ctx.Width())
term.writeMutex.Unlock()
rect := vterm.NewRect(0, ctx.Width(), 0, ctx.Height())
term.damageMutex.Lock()
term.damage = append(term.damage, *rect)
term.damageMutex.Unlock()
return
}
}
screen := term.vterm.ObtainScreen()
type coords struct {
x int
y int
}
// naive optimization
visited := make(map[coords]interface{})
term.damageMutex.Lock()
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
term.damageMutex.Unlock()
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) MouseEvent(localX int, localY int, event tcell.Event) {
switch event := event.(type) {
case *tcell.EventMouse:
if term.OnEvent != nil {
if term.OnEvent(event) {
return
}
}
if term.closed {
return
}
}
}
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()
foreground := cell.Fg()
var (
bg tcell.Color
fg tcell.Color
)
if background.IsDefaultBg() {
bg = tcell.ColorDefault
} else if background.IsIndexed() {
bg = tcell.Color(tcell.PaletteColor(int(background.GetIndex())))
} else if background.IsRgb() {
r, g, b := background.GetRGB()
bg = tcell.NewRGBColor(int32(r), int32(g), int32(b))
}
if foreground.IsDefaultFg() {
fg = tcell.ColorDefault
} else if foreground.IsIndexed() {
fg = tcell.Color(tcell.PaletteColor(int(foreground.GetIndex())))
} else if foreground.IsRgb() {
r, g, b := foreground.GetRGB()
fg = tcell.NewRGBColor(int32(r), int32(g), int32(b))
}
style = style.Background(bg).Foreground(fg)
attrs := cell.Attrs()
if attrs.Bold != 0 {
style = style.Bold(true)
}
if attrs.Italic != 0 {
style = style.Italic(true)
}
if attrs.Underline != 0 {
style = style.Underline(true)
}
if attrs.Blink != 0 {
style = style.Blink(true)
}
if attrs.Reverse != 0 {
style = style.Reverse(true)
}
return style
}
func (term *Terminal) onDamage(rect *vterm.Rect) int {
term.damageMutex.Lock()
term.damage = append(term.damage, *rect)
term.damageMutex.Unlock()
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
}
