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53 lines
1.3 KiB
53 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("graceful-fs")
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, path = require("path")
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, npm = require("../npm.js")
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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 (npm.config.get("global")) return cb(null, 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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if (er && p === original) return cb(er)
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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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