sc4/lib/cli/prompts/hex-prompt.js

A command line utility for automating SimCity 4 modding tasks & modifying savegames

// # hex-prompt.js
import input from '@inquirer/input';
// # hex(opts)
// Helper function for requesting a single hexadecimal number as input, with 
// validation.
export async function hex(opts) {
    return +await input({
        validate(input) {
            if (!input.startsWith('0x')) {
                return 'Please input a valid hexadecimal number (prefixed with 0x)';
            }
            let nr = +input;
            if (Number.isNaN(nr)) {
                return 'Please input a valid hexadecimal number (prefixed with 0x)';
            }
            return true;
        },
        ...opts,
        default: typeof opts.default === 'number' ? stringify(opts.default) : undefined,
    });
}
// # stringify(nr)
function stringify(nr) {
    return `0x${nr.toString(16)}`;
}