How Can I Handle Keypresses Efficiently in a Go REPL?

Keypress Input Handling in Go

In Go, the ReadString function reads a string from standard input, waiting for the return key to be pressed. However, when building a REPL (read-eval-print loop) application, it is necessary to respond to keypress events promptly.

Alternative Approach

Instead of relying on ReadString, consider using game engines that offer platform-agnostic keyboard input handling. One such library is Azul3D's keyboard library.

Keypress Event Monitoring

The library provides a keyboard watcher that monitors the state of all keys. By querying the watcher for the status map, you can determine whether a specific key is pressed, held down, or released.

import (
    "github.com/azul3d/keyboard"
)

func main() {
    watcher := keyboard.NewWatcher()
    status := watcher.States()

    for {
        left := status[keyboard.ArrowLeft]
        if left == keyboard.Down {
            // The arrow left key is being held down.
        }
    }
}

This code iterates over the status map, detecting any keys that are currently pressed down. You can then perform the appropriate actions based on the key being pressed.

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