vt100test.go

package main

import (
	"fmt"
	"os"
	"time"

	"golang.org/x/sys/unix"
)

const (
	tcgetattr = unix.TCGETS
	tcsetattr = unix.TCSETS
)

func read(escape, cmd string) string {
	t, err := unix.IoctlGetTermios(unix.Stdout, tcgetattr)
	if err != nil {
		panic(err)
	}

	defer unix.IoctlSetTermios(unix.Stdout, tcsetattr, t)

	noecho := *t
	noecho.Lflag = noecho.Lflag &^ unix.ECHO
	noecho.Lflag = noecho.Lflag &^ unix.ICANON
	if err := unix.IoctlSetTermios(unix.Stdout, tcsetattr, &noecho); err != nil {
		panic(err)
	}

	start := time.Now()
	fmt.Printf(escape, cmd)

	buf := make([]byte, 100)
	n, err := os.Stdin.Read(buf)
	if err != nil {
		panic(err)
	}

	buf = buf[:n]
	fmt.Printf("read after %.6fs: %q\n", time.Since(start).Seconds(), buf)

	return string(buf)
}

const (
	cmdCursorPosition  = "\033[6n"
	cmdBackgroundColor = "\033]11;?\a"

	escapeRaw    = "%s"
	escapeScreen = "\033P\033%s\033\\"
	escapeTmux   = "\033Ptmux;\033%s\033\\"
)

func main() {
	read(escapeRaw, cmdCursorPosition)
	read(escapeScreen, cmdCursorPosition)
	read(escapeTmux, cmdCursorPosition)

	read(escapeRaw, cmdBackgroundColor)
	read(escapeScreen, cmdBackgroundColor)
	read(escapeTmux, cmdBackgroundColor)
}