Read a character from standard input in Go (without pressing Enter)

Question

I want my app to show:

press any key to exit ...

And to exit when I press any key.

How can I achieve this?

Note: I have googled but all of what I've found needed to press Enter at the end. I want something like Console.ReadKey() in C#.

I am running MS Windows.

Answer 1

The package "golang.org/x/term" allows you to switch the stdin into raw mode to read each byte at a time.

package main

import (
    "fmt"
    "os"

    "golang.org/x/term"
)

func main() {
    // switch stdin into 'raw' mode
    oldState, err := term.MakeRaw(int(os.Stdin.Fd()))
    if err != nil {
        fmt.Println(err)
        return
    }
    defer term.Restore(int(os.Stdin.Fd()), oldState)

    b := make([]byte, 1)
    _, err = os.Stdin.Read(b)
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Printf("the char %q was hit", string(b[0]))
}