Deep hard link / copy

deep.js.coffee

fs = require 'fs'
path = require 'path'
RSVP = require 'rsvp'
rimraf = require 'rimraf'
mkdirp = require 'mkdirp'
walkSync = require 'walk-sync'

# Passing in a srcDir allow us to know where the path should be relative to.
# This means we can autocreate subdirectories for all files.
exports.linkFiles = (files, srcDir, destDir) ->
  new RSVP.Promise (resolve, reject) ->
    for file in files
      # stat follows symlinks. fstat does not. stat will follow a symlink all
      # the way to the end. Circular references will throw:
      # Error: ELOOP, too many symbolic links encountered
      srcFile = srcDir + '/' + file
      stats = fs.statSync srcFile

      # Skip for now? I think no need for empty directories.
      continue if stats.isDirectory()

      reject "Can't copy #{file}" unless stats.isFile()

      destFile = destDir + '/' + file
      mkdirp.sync path.dirname(destFile)
      fs.linkSync srcFile, destFile

    resolve()

# Hard link a directory structure
exports.link = (srcDir, destDir) ->
  rimraf.sync destDir
  files = walkSync srcDir
  exports.linkFiles files, srcDir, destDir

exports.copy = (srcDir, destDir) ->
  new RSVP.Promise (resolve, reject) ->
    ncp srcDir, destDir, stopOnErr: true, clobber: true, (err) ->
      if err
        console.log "Copy error".red, err
        reject(err)
      else
        resolve()