input.js
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	'use strict';

	const Prompt = require('../types/string');
	const completer = require('../completer');

	class Input extends Prompt {
	constructor(options) {
	super(options);
	let history = this.options.history;
	if (history && history.store) {
	let initial = history.values \|\| this.initial;
	this.autosave = !!history.autosave;
	this.store = history.store;
	this.data = this.store.get('values') \|\| { past: [], present: initial };
	this.initial = this.data.present \|\| this.data.past[this.data.past.length - 1];
	}
	}

	completion(action) {
	if (!this.store) return this.alert();
	this.data = completer(action, this.data, this.input);
	if (!this.data.present) return this.alert();
	this.input = this.data.present;
	this.cursor = this.input.length;
	return this.render();
	}

	altUp() {
	return this.completion('prev');
	}

	altDown() {
	return this.completion('next');
	}

	prev() {
	this.save();
	return super.prev();
	}

	save() {
	if (!this.store) return;
	this.data = completer('save', this.data, this.input);
	this.store.set('values', this.data);
	}

	submit() {
	if (this.store && this.autosave === true) {
	this.save();
	}
	return super.submit();
	}
	}

	module.exports = Input;