# all files / lib/ link-writer.js

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     module.exports = LinkWriter

    var fs = require('graceful-fs')
    var Writer = require('./writer.js')
    var inherits = require('inherits')
    var path = require('path')
    var rimraf = require('rimraf')

    inherits(LinkWriter, Writer)

    function LinkWriter (props) {
      var self = this
      if (!(self instanceof LinkWriter)) {
        throw new Error('LinkWriter must be called as constructor.')
      }

      // should already be established as a Link type
      if (!((props.type === 'Link' && props.Link) ||
        (props.type === 'SymbolicLink' && props.SymbolicLink))) {
        throw new Error('Non-link type ' + props.type)
      }

      if (props.linkpath === '') props.linkpath = '.'
      if (!props.linkpath) {
        self.error('Need linkpath property to create ' + props.type)
      }

      Writer.call(this, props)
    }

    LinkWriter.prototype._create = function () {
      // console.error(" LW _create")
      var self = this
      var hard = self.type === 'Link' || process.platform === 'win32'
      var link = hard ? 'link' : 'symlink'
      var lp = hard ? path.resolve(self.dirname, self.linkpath) : self.linkpath

      // can only change the link path by clobbering
      // For hard links, let's just assume that's always the case, since
      // there's no good way to read them if we don't already know.
      if (hard) return clobber(self, lp, link)

      fs.readlink(self._path, function (er, p) {
        // only skip creation if it's exactly the same link
        if (p && p === lp) return finish(self)
        clobber(self, lp, link)
      })
    }

    function clobber (self, lp, link) {
      rimraf(self._path, function (er) {
        if (er) return self.error(er)
        create(self, lp, link)
      })
    }

    function create (self, lp, link) {
      fs[link](lp, self._path, function (er) {
        // if this is a hard link, and we're in the process of writing out a
        // directory, it's very possible that the thing we're linking to
        // doesn't exist yet (especially if it was intended as a symlink),
        // so swallow ENOENT errors here and just soldier in.
        // Additionally, an EPERM or EACCES can happen on win32 if it's trying
        // to make a link to a directory.  Again, just skip it.
        // A better solution would be to have fs.symlink be supported on
        // windows in some nice fashion.
        if (er) {
          if ((er.code === 'ENOENT' ||
            er.code === 'EACCES' ||
            er.code === 'EPERM') && process.platform === 'win32') {
            self.ready = true
            self.emit('ready')
            self.emit('end')
            self.emit('close')
            self.end = self._finish = function () {}
          } else return self.error(er)
        }
        finish(self)
      })
    }

    function finish (self) {
      self.ready = true
      self.emit('ready')
      if (self._ended && !self._finished) self._finish()
    }

    LinkWriter.prototype.end = function () {
      // console.error("LW finish in end")
      this._ended = true
      if (this.ready) {
        this._finished = true
        this._finish()
      }
    }