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// try to find the most reasonable prefix to use
module.exports = findPrefix
var fs = require('fs')
var path = require('path')
function findPrefix (p, cb_) {
function cb (er, p) {
process.nextTick(function () {
cb_(er, p)
})
}
p = path.resolve(p)
// if there's no node_modules folder, then
// walk up until we hopefully find one.
// if none anywhere, then use cwd.
var walkedUp = false
while (path.basename(p) === 'node_modules') {
p = path.dirname(p)
walkedUp = true
}
if (walkedUp) return cb(null, p)
findPrefix_(p, p, cb)
}
function findPrefix_ (p, original, cb) {
if (p === '/' ||
(process.platform === 'win32' && p.match(/^[a-zA-Z]:(\\|\/)?$/))) {
return cb(null, original)
}
fs.readdir(p, function (er, files) {
// an error right away is a bad sign.
// unless the prefix was simply a non
// existent directory.
if (er && p === original) {
if (er.code === 'ENOENT') return cb(null, original)
return cb(er)
}
// walked up too high or something.
if (er) return cb(null, original)
if (files.indexOf('node_modules') !== -1 ||
files.indexOf('package.json') !== -1) {
return cb(null, p)
}
var d = path.dirname(p)
if (d === p) return cb(null, original)
return findPrefix_(d, original, cb)
})
}
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