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