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module.exports = loadPrefix

var findPrefix = require('find-npm-prefix')
var path = require('path')

function loadPrefix (cb) {
  var cli = this.list[0]

  Object.defineProperty(this, 'prefix',
    {
      set: function (prefix) {
        var g = this.get('global')
        this[g ? 'globalPrefix' : 'localPrefix'] = prefix
      }.bind(this),
      get: function () {
        var g = this.get('global')
        return g ? this.globalPrefix : this.localPrefix
      }.bind(this),
      enumerable: true
    })

  Object.defineProperty(this, 'globalPrefix',
    {
      set: function (prefix) {
        this.set('prefix', prefix)
      }.bind(this),
      get: function () {
        return path.resolve(this.get('prefix'))
      }.bind(this),
      enumerable: true
    })

  var p
  Object.defineProperty(this, 'localPrefix',
    { set: function (prefix) { p = prefix },
      get: function () { return p },
      enumerable: true })

  // try to guess at a good node_modules location.
  // If we are *explicitly* given a prefix on the cli, then
  // always use that.  otherwise, infer local prefix from cwd.
  if (Object.prototype.hasOwnProperty.call(cli, 'prefix')) {
    p = path.resolve(cli.prefix)
    process.nextTick(cb)
  } else {
    findPrefix(process.cwd()).then((found) => {
      p = found
      cb()
    }, cb)
  }
}