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 < 16; i += 1 { // Set the first 16 colors to predictable near-black RGB values tcolor := tcell.Color(i) var r uint8 = 0 var g uint8 = 0 var b uint8 = uint8(i + 1) state.SetPaletteColor(i, vterm.NewVTermColorRGB(gocolor.RGBA{r, g, b, 255})) 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 }