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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()
fs.readlink(to, function (er, fromOnDisk) {
// if the link already exists and matches what we would do,
// we don't need to do anything
if (!er) {
var toDir = path.dirname(to)
var absoluteFrom = path.resolve(toDir, from)
var absoluteFromOnDisk = path.resolve(toDir, fromOnDisk)
if (absoluteFrom === absoluteFromOnDisk) 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)
}
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