 
     else if @outputFile
       if @inputFiles.length > 1
-        @error "autoprefixer: For several files you can specify only output " +
-               "dir (by `-d DIR`),\nnot one output file"
+        @error """autoprefixer: For several files you can specify only output \
+                    dir (by `-d DIR`),
+                  not one output file"""
         return
 
       [file, @outputFile] for file in @inputFiles

      Separate browsers by comma. For example, `-b "> 1%, opera 12"'.
      You can set browsers by global usage statictics: `-b \"> 1%\"'.
      or last version: `-b "last 2 versions"'.
    '''.replace(/\+\s+/g, '')

  # Print to stdout
  print: (str) ->


    if @outputDir
      if @inputFiles.length == 0
        @error """autoprefixer: For STDIN input you need to specify output \
                    file (by `-o FILE`),
                  not output dir"""
        return

      if fs.existsSync(@outputDir) and not fs.statSync(@outputDir).isDirectory()
