Plop.js Inquirer.js multiple inputs e.g. for input tags or taxonomies.

inquirer-input-multiple.js

const BaseInput = require('inquirer/lib/prompts/input');

/**
 * A custom inquirer input plugin that keeps requesting the same input until
 * nothing is specified.
 * Useful for taking in the same input multiple times e.g. tags.
 */
class InputMultiplePrompt extends BaseInput {

	constructor(...args) {
		super(...args)

		this.opt.validate = this.createValidator(this.opt.validate)
		this.multipleInputOutput = []
	}

	createValidator(validate) {
		return (...args) => {
			const [input] = args;
			const isValid = validate(...args);
			// Empty response, simply an Enter.
			const noResponse = !input;
			if (isValid && input) {
				this.multipleInputOutput.push(input);
				// Allow it to print a second time.
				this.screen.done();
			}

			return isValid && noResponse;
		};
	}

	onEnd(state) {
		state.value = this.multipleInputOutput;
		this.answer = state.value;
		this.status = 'answered';

		// No need to re-render prompt.
		// this.render();

		this.screen.done();
		this.done(state.value);
	}

}

/**
 * Plop support - https://github.com/plopjs/plop#3rd-party-prompt-bypass
 */
InputMultiplePrompt.bypass = function bypass(rawValue, promptConfig) {
	let value = rawValue;
	if (typeof rawValue === 'string') {
		try {
			value = JSON.parse( String(rawValue) );
		} catch ( e ) {
			throw new Error(`"${ rawValue }" is not a valid JSON string.`);
		}
	}

	if (!Array.isArray(value)) {
		throw new Error(`"${ rawValue }" is not a valid array.`);
	}

	return value;
};

module.exports = InputMultiplePrompt;