move.js

"use strict";

var d     = require("d")
  , trunc = require("es5-ext/math/trunc");

var up, down, right, left, abs = Math.abs, floor = Math.floor, max = Math.max;

var getMove = function (control) {
	return function (num) {
		num = isNaN(num) ? 0 : max(floor(num), 0);
		return num ? "\x1b[" + num + control : "";
	};
};

module.exports = Object.defineProperties(
	function (x, y) {
		x = isNaN(x) ? 0 : floor(x);
		y = isNaN(y) ? 0 : floor(y);
		return (x > 0 ? right(x) : left(-x)) + (y > 0 ? down(y) : up(-y));
	},
	{
		up: d((up = getMove("A"))),
		down: d((down = getMove("B"))),
		right: d((right = getMove("C"))),
		left: d((left = getMove("D"))),
		to: d(function (x, y) {
			x = isNaN(x) ? 1 : max(floor(x), 0) + 1;
			y = isNaN(y) ? 1 : max(floor(y), 0) + 1;
			return "\x1b[" + y + ";" + x + "H";
		}),
		lines: d(function (n) {
			var dir;
			n = trunc(n) || 0;
			dir = n >= 0 ? "B" : "A";
			n = floor(abs(n));
			return "\x1b[" + n + dir + "\x1b[1G";
		}),
		top: d("\x1b[5000F"),
		bottom: d("\x1b[5000B"),
		lineBegin: d("\x1b[5000D"),
		lineEnd: d("\x1b[5000C")
	}
);