How Can I Achieve Non-Blocking Character Input in Go?

Non-Blocking Character Input in Go

Reading a character from standard input without pressing Enter can be achieved using Go's standard library and executing operating system commands.

For Windows users, a non-canonical input mode may be available using the syscall package. However, this approach is platform-dependent and may not be suitable cross-platform development.

UNIX-Based Solution

The provided solution works for UNIX-based systems and disables input buffering and character echoing:

package main

import (
    "fmt"
    "os"
    "os/exec"
)

func main() {
    // disable input buffering
    exec.Command("stty", "-F", "/dev/tty", "cbreak", "min", "1").Run()
    // do not display entered characters on the screen
    exec.Command("stty", "-F", "/dev/tty", "-echo").Run()

    var b []byte = make([]byte, 1)
    for {
        os.Stdin.Read(b)
        fmt.Println("I got the byte", b, "("+string(b)+")")
    }
}

This program will repeatedly read a character from standard input until it is terminated. The cbreak mode disables line buffering, while the -echo flag prevents the entered character from being displayed on the screen.

Note:

This solution assumes that you are using a terminal emulator that supports non-canonical input mode. If your terminal does not support it, you may need to adjust the code accordingly.

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