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'use strict'
const promisify = require('./util.js').promisify
const path = require('path')
const statAsync = promisify(require('fs').stat)
module.exports = getPrefix
function getPrefix (root) {
const original = root = path.resolve(root)
while (path.basename(root) === 'node_modules') {
root = path.dirname(root)
}
if (original !== root) {
return Promise.resolve(root)
} else {
return Promise.resolve(getPrefixFromTree(root))
}
}
function getPrefixFromTree (current) {
if (isRootPath(current, process.platform)) {
return false
} else {
return Promise.all([
fileExists(path.join(current, 'package.json')),
fileExists(path.join(current, 'node_modules'))
]).then(args => {
const hasPkg = args[0]
const hasModules = args[1]
if (hasPkg || hasModules) {
return current
} else {
return getPrefixFromTree(path.dirname(current))
}
})
}
}
module.exports._fileExists = fileExists
function fileExists (f) {
return statAsync(f).catch(err => {
if (err.code !== 'ENOENT') {
throw err
}
})
}
module.exports._isRootPath = isRootPath
function isRootPath (p, platform) {
return platform === 'win32'
? p.match(/^[a-z]+:[/\\]?$/i)
: p === '/'
}