package widgets
import (
"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
ctx *ui.Context
cursorPos vterm.Pos
cursorShown bool
damage []vterm.Rect
focus bool
onInvalidate func(d ui.Drawable)
pty *os.File
vterm *vterm.VTerm
}
func NewTerminal(cmd *exec.Cmd) (*Terminal, error) {
term := &Terminal{}
term.cmd = cmd
tty, err := pty.Start(cmd)
if err != nil {
return nil, err
}
term.pty = tty
rows, cols, err := pty.Getsize(term.pty)
if err != nil {
return nil, err
}
term.vterm = vterm.New(rows, cols)
term.vterm.SetUTF8(true)
go func() {
buf := make([]byte, 2048)
for {
n, err := term.pty.Read(buf)
if err != nil {
term.Close()
}
n, err = term.vterm.Write(buf[:n])
if err != nil {
term.Close()
}
term.Invalidate()
}
}()
screen := term.vterm.ObtainScreen()
screen.OnDamage = term.onDamage
screen.OnMoveCursor = term.onMoveCursor
screen.Reset(true)
return term, nil
}
func (term *Terminal) Close() {
if term.closed {
return
}
term.closed = true
term.vterm.Close()
term.pty.Close()
term.cmd.Process.Kill()
}
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) {
term.ctx = ctx // gross
if term.closed {
return
}
rows, cols, err := pty.Getsize(term.pty)
if err != nil {
return
}
if ctx.Width() != cols || ctx.Height() != rows {
winsize := pty.Winsize{
Cols: uint16(ctx.Width()),
Rows: uint16(ctx.Height()),
}
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 := 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 {
// TODO
return false
}
func styleFromCell(cell *vterm.ScreenCell) tcell.Style {
background := cell.Bg()
br, bg, bb := background.GetRGB()
foreground := cell.Fg()
fr, fg, fb := foreground.GetRGB()
style := tcell.StyleDefault.
Background(tcell.NewRGBColor(int32(br), int32(bg), int32(bb))).
Foreground(tcell.NewRGBColor(int32(fr), int32(fg), int32(fb)))
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
}