--- /dev/null
+var path = require('path')
+var fs = require('graceful-fs')
+var mkdir = require('../mkdirs')
+
+function createLink (srcpath, dstpath, callback) {
+ function makeLink (srcpath, dstpath) {
+ fs.link(srcpath, dstpath, function (err) {
+ if (err) return callback(err)
+ callback(null)
+ })
+ }
+
+ fs.exists(dstpath, function (destinationExists) {
+ if (destinationExists) return callback(null)
+ fs.lstat(srcpath, function (err, stat) {
+ if (err) {
+ err.message = err.message.replace('lstat', 'ensureLink')
+ return callback(err)
+ }
+
+ var dir = path.dirname(dstpath)
+ fs.exists(dir, function (dirExists) {
+ if (dirExists) return makeLink(srcpath, dstpath)
+ mkdir.mkdirs(dir, function (err) {
+ if (err) return callback(err)
+ makeLink(srcpath, dstpath)
+ })
+ })
+ })
+ })
+}
+
+function createLinkSync (srcpath, dstpath, callback) {
+ var destinationExists = fs.existsSync(dstpath)
+ if (destinationExists) return undefined
+
+ try {
+ fs.lstatSync(srcpath)
+ } catch (err) {
+ err.message = err.message.replace('lstat', 'ensureLink')
+ throw err
+ }
+
+ var dir = path.dirname(dstpath)
+ var dirExists = fs.existsSync(dir)
+ if (dirExists) return fs.linkSync(srcpath, dstpath)
+ mkdir.mkdirsSync(dir)
+
+ return fs.linkSync(srcpath, dstpath)
+}
+
+module.exports = {
+ createLink: createLink,
+ createLinkSync: createLinkSync,
+ // alias
+ ensureLink: createLink,
+ ensureLinkSync: createLinkSync
+}