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58 lines
1.5 KiB
58 lines
1.5 KiB
module.exports = link
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link.ifExists = linkIfExists
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var fs = require('graceful-fs')
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var chain = require('slide').chain
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var mkdir = require('mkdirp')
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var rm = require('./gently-rm.js')
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var path = require('path')
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var npm = require('../npm.js')
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function linkIfExists (from, to, gently, cb) {
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fs.stat(from, function (er) {
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if (er) return cb()
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fs.readlink(to, function (er, fromOnDisk) {
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// if the link already exists and matches what we would do,
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// we don't need to do anything
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if (!er) {
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var toDir = path.dirname(to)
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var absoluteFrom = path.resolve(toDir, from)
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var absoluteFromOnDisk = path.resolve(toDir, fromOnDisk)
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if (absoluteFrom === absoluteFromOnDisk) return cb()
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}
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link(from, to, gently, cb)
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})
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})
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}
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function link (from, to, gently, abs, cb) {
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if (typeof cb !== 'function') {
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cb = abs
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abs = false
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}
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if (typeof cb !== 'function') {
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cb = gently
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gently = null
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}
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if (npm.config.get('force')) gently = false
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to = path.resolve(to)
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var target = from = path.resolve(from)
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if (!abs && process.platform !== 'win32') {
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// junctions on windows must be absolute
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target = path.relative(path.dirname(to), from)
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// if there is no folder in common, then it will be much
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// longer, and using a relative link is dumb.
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if (target.length >= from.length) target = from
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}
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chain(
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[
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[fs, 'stat', from],
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[rm, to, gently],
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[mkdir, path.dirname(to)],
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[fs, 'symlink', target, to, 'junction']
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],
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cb
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)
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}
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