| var path = require('path'); |
| |
| module.exports = function (basedir, relfiles) { |
| if (relfiles) { |
| var files = relfiles.map(function (r) { |
| return path.resolve(basedir, r); |
| }); |
| } |
| else { |
| var files = basedir; |
| } |
| |
| var res = files.slice(1).reduce(function (ps, file) { |
| if (!file.match(/^([A-Za-z]:)?\/|\\/)) { |
| throw new Error('relative path without a basedir'); |
| } |
| |
| var xs = file.split(/\/+|\\+/); |
| for ( |
| var i = 0; |
| ps[i] === xs[i] && i < Math.min(ps.length, xs.length); |
| i++ |
| ); |
| return ps.slice(0, i); |
| }, files[0].split(/\/+|\\+/)); |
| |
| // Windows correctly handles paths with forward-slashes |
| return res.length > 1 ? res.join('/') : '/' |
| }; |