+var core = require('./core');
+var fs = require('fs');
+var path = require('path');
+var caller = require('./caller.js');
+var nodeModulesPaths = require('./node-modules-paths.js');
+
+module.exports = function (x, opts) {
+ if (!opts) opts = {};
+ var isFile = opts.isFile || function (file) {
+ try { var stat = fs.statSync(file) }
+ catch (err) { if (err && err.code === 'ENOENT') return false }
+ return stat.isFile() || stat.isFIFO();
+ };
+ var readFileSync = opts.readFileSync || fs.readFileSync;
+
+ var extensions = opts.extensions || [ '.js' ];
+ var y = opts.basedir || path.dirname(caller());
+
+ opts.paths = opts.paths || [];
+
+ if (/^(?:\.\.?(?:\/|$)|\/|([A-Za-z]:)?[\\\/])/.test(x)) {
+ var res = path.resolve(y, x);
+ if (x === '..') res += '/';
+ var m = loadAsFileSync(res) || loadAsDirectorySync(res);
+ if (m) return m;
+ } else {
+ var n = loadNodeModulesSync(x, y);
+ if (n) return n;
+ }
+
+ if (core[x]) return x;
+
+ throw new Error("Cannot find module '" + x + "' from '" + y + "'");
+
+ function loadAsFileSync (x) {
+ if (isFile(x)) {
+ return x;
+ }
+
+ for (var i = 0; i < extensions.length; i++) {
+ var file = x + extensions[i];
+ if (isFile(file)) {
+ return file;
+ }
+ }
+ }
+
+ function loadAsDirectorySync (x) {
+ var pkgfile = path.join(x, '/package.json');
+ if (isFile(pkgfile)) {
+ var body = readFileSync(pkgfile, 'utf8');
+ try {
+ var pkg = JSON.parse(body);
+ if (opts.packageFilter) {
+ pkg = opts.packageFilter(pkg, x);
+ }
+
+ if (pkg.main) {
+ var m = loadAsFileSync(path.resolve(x, pkg.main));
+ if (m) return m;
+ var n = loadAsDirectorySync(path.resolve(x, pkg.main));
+ if (n) return n;
+ }
+ }
+ catch (err) {}
+ }
+
+ return loadAsFileSync(path.join( x, '/index'));
+ }
+
+ function loadNodeModulesSync (x, start) {
+ var dirs = nodeModulesPaths(start, opts);
+ for (var i = 0; i < dirs.length; i++) {
+ var dir = dirs[i];
+ var m = loadAsFileSync(path.join( dir, '/', x));
+ if (m) return m;
+ var n = loadAsDirectorySync(path.join( dir, '/', x ));
+ if (n) return n;
+ }
+ }
+};