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module.exports = link
link.ifExists = linkIfExists
var fs = require('graceful-fs')
var chain = require('slide').chain
var mkdir = require('mkdirp')
var rm = require('./gently-rm.js')
var path = require('path')
var 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
)
}