/**
 * This code is copied from page:
 *   https://github.com/isaacs/npm/blob/master/lib/install.js
 *
 * Modified by unclechu for demonstration tabs with spaces coding:
 *   http://unclechumind.blogspot.com/2012/08/blog-post.html
 */
function localLink (target, where, context, cb) {
	log.verbose("localLink", target._id)
	var jsonFile = path.resolve( npm.globalDir, target.name
	                           , "package.json" )
	  , parent = context.parent

	readJson(jsonFile, function (er, data) {
		if (er || data._id === target._id) {
			if (er) {
				install( path.resolve(npm.globalDir, "..")
				       , target._id
				       , function (er) {
				         	if (er) return cb(er, [])
				         	thenLink()
				         }
				       )
			} else thenLink()

			function thenLink () {
				npm.commands.link([target.name], function (er, d) {
					log.silly("localLink", "back from link", [er, d])
					cb(er, [resultList(target, where, parent && parent._id)])
				})
			}

		} else {
			log.verbose("localLink", "install locally (no link)", target._id)
			installOne_(target, where, context, cb)
		}
	})
}