264 lines
5.5 KiB
Go
264 lines
5.5 KiB
Go
package widgets
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import (
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gocolor "image/color"
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"os"
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"os/exec"
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"git.sr.ht/~sircmpwn/aerc2/lib/ui"
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"git.sr.ht/~sircmpwn/go-libvterm"
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"github.com/gdamore/tcell"
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"github.com/kr/pty"
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)
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type Terminal struct {
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closed bool
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cmd *exec.Cmd
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colors map[tcell.Color]tcell.Color
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ctx *ui.Context
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cursorPos vterm.Pos
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cursorShown bool
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damage []vterm.Rect
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err error
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focus bool
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onInvalidate func(d ui.Drawable)
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pty *os.File
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start chan interface{}
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vterm *vterm.VTerm
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OnClose func(err error)
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OnTitle func(title string)
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}
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func NewTerminal(cmd *exec.Cmd) (*Terminal, error) {
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term := &Terminal{}
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term.cmd = cmd
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term.vterm = vterm.New(24, 80)
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term.vterm.SetUTF8(true)
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term.start = make(chan interface{})
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go func() {
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<-term.start
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buf := make([]byte, 2048)
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for {
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n, err := term.pty.Read(buf)
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if err != nil {
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term.Close(err)
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}
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n, err = term.vterm.Write(buf[:n])
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if err != nil {
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term.Close(err)
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}
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term.Invalidate()
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}
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}()
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screen := term.vterm.ObtainScreen()
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screen.OnDamage = term.onDamage
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screen.OnMoveCursor = term.onMoveCursor
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screen.OnSetTermProp = term.onSetTermProp
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screen.Reset(true)
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state := term.vterm.ObtainState()
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term.colors = make(map[tcell.Color]tcell.Color)
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for i := 0; i < 16; i += 1 {
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// Set the first 16 colors to predictable near-black RGB values
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tcolor := tcell.Color(i)
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var r uint8 = 0
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var g uint8 = 0
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var b uint8 = uint8(i + 1)
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state.SetPaletteColor(i,
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vterm.NewVTermColorRGB(gocolor.RGBA{r, g, b, 255}))
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term.colors[tcell.NewRGBColor(int32(r), int32(g), int32(b))] = tcolor
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}
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fg, bg := state.GetDefaultColors()
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r, g, b := bg.GetRGB()
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term.colors[tcell.NewRGBColor(
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int32(r), int32(g), int32(b))] = tcell.ColorDefault
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r, g, b = fg.GetRGB()
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term.colors[tcell.NewRGBColor(
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int32(r), int32(g), int32(b))] = tcell.ColorDefault
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return term, nil
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}
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func (term *Terminal) Close(err error) {
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term.err = err
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if term.vterm != nil {
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term.vterm.Close()
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term.vterm = nil
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}
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if term.pty != nil {
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term.pty.Close()
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term.pty = nil
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}
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if term.cmd != nil && term.cmd.Process != nil {
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term.cmd.Process.Kill()
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term.cmd = nil
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}
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if !term.closed && term.OnClose != nil {
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term.OnClose(err)
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}
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term.closed = true
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}
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func (term *Terminal) OnInvalidate(cb func(d ui.Drawable)) {
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term.onInvalidate = cb
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}
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func (term *Terminal) Invalidate() {
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if term.onInvalidate != nil {
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term.onInvalidate(term)
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}
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}
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func (term *Terminal) Draw(ctx *ui.Context) {
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if term.closed {
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if term.err != nil {
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ui.NewText(term.err.Error()).Strategy(ui.TEXT_CENTER).Draw(ctx)
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} else {
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ui.NewText("Terminal closed").Strategy(ui.TEXT_CENTER).Draw(ctx)
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}
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return
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}
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winsize := pty.Winsize{
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Cols: uint16(ctx.Width()),
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Rows: uint16(ctx.Height()),
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}
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if term.pty == nil {
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term.vterm.SetSize(ctx.Height(), ctx.Width())
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tty, err := pty.StartWithSize(term.cmd, &winsize)
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term.pty = tty
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if err != nil {
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term.Close(err)
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return
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}
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term.start <- nil
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}
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term.ctx = ctx // gross
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rows, cols, err := pty.Getsize(term.pty)
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if err != nil {
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return
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}
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if ctx.Width() != cols || ctx.Height() != rows {
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pty.Setsize(term.pty, &winsize)
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term.vterm.SetSize(ctx.Height(), ctx.Width())
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return
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}
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screen := term.vterm.ObtainScreen()
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screen.Flush()
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type coords struct {
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x int
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y int
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}
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// naive optimization
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visited := make(map[coords]interface{})
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for _, rect := range term.damage {
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for x := rect.StartCol(); x < rect.EndCol() && x < ctx.Width(); x += 1 {
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for y := rect.StartCol(); y < rect.EndCol() && y < ctx.Height(); y += 1 {
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coords := coords{x, y}
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if _, ok := visited[coords]; ok {
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continue
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}
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visited[coords] = nil
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cell, err := screen.GetCellAt(y, x)
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if err != nil {
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continue
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}
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style := term.styleFromCell(cell)
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ctx.Printf(x, y, style, "%s", string(cell.Chars()))
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}
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}
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}
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}
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func (term *Terminal) Focus(focus bool) {
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term.focus = focus
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term.resetCursor()
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}
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func (term *Terminal) Event(event tcell.Event) bool {
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return false
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}
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func (term *Terminal) styleFromCell(cell *vterm.ScreenCell) tcell.Style {
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style := tcell.StyleDefault
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background := cell.Bg()
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r, g, b := background.GetRGB()
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bg := tcell.NewRGBColor(int32(r), int32(g), int32(b))
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foreground := cell.Fg()
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r, g, b = foreground.GetRGB()
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fg := tcell.NewRGBColor(int32(r), int32(g), int32(b))
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if color, ok := term.colors[bg]; ok {
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style = style.Background(color)
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} else {
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style = style.Background(bg)
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}
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if color, ok := term.colors[fg]; ok {
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style = style.Foreground(color)
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} else {
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style = style.Foreground(fg)
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}
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if cell.Attrs().Bold != 0 {
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style = style.Bold(true)
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}
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if cell.Attrs().Underline != 0 {
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style = style.Underline(true)
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}
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if cell.Attrs().Blink != 0 {
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style = style.Blink(true)
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}
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if cell.Attrs().Reverse != 0 {
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style = style.Reverse(true)
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}
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return style
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}
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func (term *Terminal) onDamage(rect *vterm.Rect) int {
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term.damage = append(term.damage, *rect)
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term.Invalidate()
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return 1
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}
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func (term *Terminal) resetCursor() {
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if term.ctx != nil && term.focus {
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if !term.cursorShown {
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term.ctx.HideCursor()
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} else {
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term.ctx.SetCursor(term.cursorPos.Col(), term.cursorPos.Row())
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}
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}
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}
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func (term *Terminal) onMoveCursor(old *vterm.Pos,
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pos *vterm.Pos, visible bool) int {
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term.cursorShown = visible
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term.cursorPos = *pos
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term.resetCursor()
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return 1
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}
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func (term *Terminal) onSetTermProp(prop int, val *vterm.VTermValue) int {
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switch prop {
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case vterm.VTERM_PROP_TITLE:
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if term.OnTitle != nil {
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term.OnTitle(val.String)
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}
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}
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return 1
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}
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