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node_modules/fs-extra/lib/ensure/symlink.js

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+'use strict'
+
+const u = require('universalify').fromCallback
+const path = require('path')
+const fs = require('../fs')
+const _mkdirs = require('../mkdirs')
+const mkdirs = _mkdirs.mkdirs
+const mkdirsSync = _mkdirs.mkdirsSync
+
+const _symlinkPaths = require('./symlink-paths')
+const symlinkPaths = _symlinkPaths.symlinkPaths
+const symlinkPathsSync = _symlinkPaths.symlinkPathsSync
+
+const _symlinkType = require('./symlink-type')
+const symlinkType = _symlinkType.symlinkType
+const symlinkTypeSync = _symlinkType.symlinkTypeSync
+
+const pathExists = require('../path-exists').pathExists
+
+const { areIdentical } = require('../util/stat')
+
+function createSymlink (srcpath, dstpath, type, callback) {
+  callback = (typeof type === 'function') ? type : callback
+  type = (typeof type === 'function') ? false : type
+
+  fs.lstat(dstpath, (err, stats) => {
+    if (!err && stats.isSymbolicLink()) {
+      Promise.all([
+        fs.stat(srcpath),
+        fs.stat(dstpath)
+      ]).then(([srcStat, dstStat]) => {
+        if (areIdentical(srcStat, dstStat)) return callback(null)
+        _createSymlink(srcpath, dstpath, type, callback)
+      })
+    } else _createSymlink(srcpath, dstpath, type, callback)
+  })
+}
+
+function _createSymlink (srcpath, dstpath, type, callback) {
+  symlinkPaths(srcpath, dstpath, (err, relative) => {
+    if (err) return callback(err)
+    srcpath = relative.toDst
+    symlinkType(relative.toCwd, type, (err, type) => {
+      if (err) return callback(err)
+      const dir = path.dirname(dstpath)
+      pathExists(dir, (err, dirExists) => {
+        if (err) return callback(err)
+        if (dirExists) return fs.symlink(srcpath, dstpath, type, callback)
+        mkdirs(dir, err => {
+          if (err) return callback(err)
+          fs.symlink(srcpath, dstpath, type, callback)
+        })
+      })
+    })
+  })
+}
+
+function createSymlinkSync (srcpath, dstpath, type) {
+  let stats
+  try {
+    stats = fs.lstatSync(dstpath)
+  } catch {}
+  if (stats && stats.isSymbolicLink()) {
+    const srcStat = fs.statSync(srcpath)
+    const dstStat = fs.statSync(dstpath)
+    if (areIdentical(srcStat, dstStat)) return
+  }
+
+  const relative = symlinkPathsSync(srcpath, dstpath)
+  srcpath = relative.toDst
+  type = symlinkTypeSync(relative.toCwd, type)
+  const dir = path.dirname(dstpath)
+  const exists = fs.existsSync(dir)
+  if (exists) return fs.symlinkSync(srcpath, dstpath, type)
+  mkdirsSync(dir)
+  return fs.symlinkSync(srcpath, dstpath, type)
+}
+
+module.exports = {
+  createSymlink: u(createSymlink),
+  createSymlinkSync
+}