TMS to OpenStreetMap/Google Maps tile naming – node.js script that inverts row order/y axis

tms2osm.js

/**
 * TMS to OSM/Google Maps tile naming – node.js script that inverts row order/y axis
 * assumes subfolders ./tiles/{z}/{x}/{y}.png
 */

(function() {

	// ShellJS
	require('shelljs/global');

	// Variables
	var dirs, dir, numeric, tiles, tmp,
		path = require('path'),
		extImg = '.png',
		extTmp = '.tmp';

	// Sort helper
	numeric = function(a, b) {
		var rx = /\D+/g;
		return a.replace(rx, '') - b.replace(rx, '');
	};

	// Create directory list
	dirs = find('./tiles').filter(function(el) {
		return test('-d', el);
	});

	// Walk directories
	for (var i = 0; i < dirs.length; i++) {
		dir = dirs[i];

		// Rename files
		tiles = ls(dir + '/*' + extImg).sort(numeric);
		for (var j = 0; j < tiles.length; j++) {
			mv(tiles[j], dir + '/' + (tiles.length-1-j) + extImg + extTmp);
		}

		// Clean up temporaries
		tiles = ls(dir + '/*' + extTmp).sort(numeric);
		for (var k = 0; k < tiles.length; k++) {
			mv(tiles[k], tiles[k].replace(extTmp, ''));
		}
	}

}).call(this);