1 // try to find the most reasonable prefix to use
3 module.exports = findPrefix
6 var path = require("path")
8 function findPrefix (p, cb_) {
10 process.nextTick(function () {
16 // if there's no node_modules folder, then
17 // walk up until we hopefully find one.
18 // if none anywhere, then use cwd.
20 while (path.basename(p) === "node_modules") {
24 if (walkedUp) return cb(null, p)
29 function findPrefix_ (p, original, cb) {
31 || (process.platform === "win32" && p.match(/^[a-zA-Z]:(\\|\/)?$/))) {
32 return cb(null, original)
34 fs.readdir(p, function (er, files) {
35 // an error right away is a bad sign.
36 // unless the prefix was simply a non
37 // existent directory.
38 if (er && p === original) {
39 if (er.code === "ENOENT") return cb(null, original);
43 // walked up too high or something.
44 if (er) return cb(null, original)
46 if (files.indexOf("node_modules") !== -1
47 || files.indexOf("package.json") !== -1) {
51 var d = path.dirname(p)
52 if (d === p) return cb(null, original)
54 return findPrefix_(d, original, cb)