naisys/dist/utils/input/escKeyListener.js

NAISYS - Autonomous AI agent runner with built-in context management and cost tracking

/**
 * Utility for listening to ESC key presses during async operations.
 * Uses raw mode stdin to capture key events without requiring Enter.
 */
const ESC_KEY = "\x1b";
const CTRL_C_KEY = "\x03";
export function createEscKeyListener() {
    function start(onEsc) {
        // Store original raw mode state
        const wasRaw = process.stdin.isRaw;
        // Handler for keypress data
        const onData = (data) => {
            const key = data.toString();
            if (key === ESC_KEY) {
                onEsc();
            }
            else if (key === CTRL_C_KEY) {
                // readline is paused during LLM queries, so raw mode must forward
                // Ctrl+C back to the process-level shutdown handler.
                process.emit("SIGINT", "SIGINT");
            }
        };
        // Enable raw mode to get individual keystrokes
        if (process.stdin.isTTY) {
            process.stdin.setRawMode(true);
            process.stdin.resume();
            process.stdin.on("data", onData);
        }
        // Return cleanup function
        return () => {
            if (process.stdin.isTTY) {
                process.stdin.off("data", onData);
                // Restore original raw mode state
                if (!wasRaw) {
                    process.stdin.setRawMode(false);
                }
                process.stdin.pause();
            }
        };
    }
    return {
        start,
    };
}
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