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