--- /dev/null
+var path = require('path');
+
+module.exports = function (start, opts) {
+ var modules = opts.moduleDirectory
+ ? [].concat(opts.moduleDirectory)
+ : ['node_modules']
+ ;
+
+ // ensure that `start` is an absolute path at this point,
+ // resolving against the process' current working directory
+ start = path.resolve(start);
+
+ var prefix = '/';
+ if (/^([A-Za-z]:)/.test(start)) {
+ prefix = '';
+ } else if (/^\\\\/.test(start)) {
+ prefix = '\\\\';
+ }
+
+ var splitRe = process.platform === 'win32' ? /[\/\\]/ : /\/+/;
+
+ var parts = start.split(splitRe);
+
+ var dirs = [];
+ for (var i = parts.length - 1; i >= 0; i--) {
+ if (modules.indexOf(parts[i]) !== -1) continue;
+ dirs = dirs.concat(modules.map(function(module_dir) {
+ return prefix + path.join(
+ path.join.apply(path, parts.slice(0, i + 1)),
+ module_dir
+ );
+ }));
+ }
+ if (process.platform === 'win32'){
+ dirs[dirs.length-1] = dirs[dirs.length-1].replace(":", ":\\");
+ }
+ return dirs.concat(opts.paths);
+}