text: 
  module.exports = link
  link.ifExists = linkIfExists
  
  var fs = require("graceful-fs")
    , chain = require("slide").chain
    , mkdir = require("mkdirp")
    , rm = require("./gently-rm.js")
    , path = require("path")
    , npm = require("../npm.js")
  
  function linkIfExists (from, to, gently, cb) {
    fs.stat(from, function (er) {
      if (er) return cb()
      link(from, to, gently, cb)
    })
  }
  
  function link (from, to, gently, abs, cb) {
    if (typeof cb !== "function") cb = abs, abs = false
    if (typeof cb !== "function") cb = gently, gently = null
    if (npm.config.get("force")) gently = false
  
    to = path.resolve(to)
    var target = from = path.resolve(from)
    if (!abs && process.platform !== "win32") {
      // junctions on windows must be absolute
      target = path.relative(path.dirname(to), from)
      // if there is no folder in common, then it will be much
      // longer, and using a relative link is dumb.
      if (target.length >= from.length) target = from
    }
  
    chain
      ( [ [fs, "stat", from]
        , [rm, to, gently]
        , [mkdir, path.dirname(to)]
        , [fs, "symlink", target, to, "junction"] ]
      , cb)
  }
  