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'use strict'
// try to find the most reasonable prefix to use
module.exports = findPrefix
const fs = require('fs')
const path = require('path')
function findPrefix (dir) {
return new Promise((resolve, reject) => {
dir = path.resolve(dir)
// this is a weird special case where an infinite recurse of
// node_modules folders resolves to the level that contains the
// very first node_modules folder
let walkedUp = false
while (path.basename(dir) === 'node_modules') {
dir = path.dirname(dir)
walkedUp = true
}
if (walkedUp) {
resolve(dir)
} else {
resolve(findPrefix_(dir))
}
})
}
function findPrefix_ (dir, original) {
if (!original) original = dir
const parent = path.dirname(dir)
// this is a platform independent way of checking if we're in the root
// directory
if (parent === dir) return Promise.resolve(original)
return new Promise((resolve, reject) => {
fs.readdir(dir, (err, files) => {
if (err) {
// an error right away is a bad sign.
// unless the prefix was simply a non
// existent directory.
if (err && dir === original && err.code !== 'ENOENT') {
reject(err)
} else {
resolve(original)
}
} else if (files.indexOf('node_modules') !== -1 ||
files.indexOf('package.json') !== -1) {
resolve(dir)
} else {
resolve(findPrefix_(parent, original))
}
})
})
}