How to Send Keystrokes to a Channel Without Newline in Real Time?

Sending Keystrokes to a Channel Without Newline

A common need in programming is to send keystrokes from the user's input to a channel in real-time. However, by default, stdin is line-buffered, meaning it requires a newline character to trigger any input.

The code snippet you provided:

func chars() <-chan byte {
    ch := make(chan byte)
    reader := bufio.NewReader(os.Stdin)
    go func() {
        for {
            char, err := reader.ReadByte()
            if err != nil {
                log.Fatal(err)
            }
            ch <- char
        }
    }()
    return ch
}

attempts to achieve this but fails due to the line-buffered nature of stdin. The reader.ReadByte() method will block until a newline is entered.

One solution, as suggested in the answer, is to use ncurses, a library that provides a set of functions for terminal control. Ncurses allows you to configure the terminal to switch to non-buffered mode, ensuring that each keystroke is immediately sent to the channel.

Another solution is to use the go-termbox package, which provides a higher-level API for working with input and output on the terminal. With go-termbox, you can achieve non-buffered input by calling SetInputMode(InputEsc) before reading user input.

For Linux-specific implementations, you can explore the termios library or make direct syscalls using the syscall package to configure terminal behavior. The specifics of each platform's handling of buffered input and non-buffered input should be investigated in their respective documentation or source code.

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