emacs.el

(defun flymake-scalastyle-init ()
  (let* ((temp-file (flymake-init-create-temp-buffer-copy
                     'flymake-create-temp-inplace))
         (local-file (file-relative-name
                      temp-file
                      (file-name-directory buffer-file-name))))
    (list "~/.local/bin/scalastyle.sh" (list local-file))))
(add-to-list 'flymake-allowed-file-name-masks
             '("\\.scala\\'" flymake-scalastyle-init))
(add-hook 'scala-mode-hook
          '(lambda ()
             (flymake-mode t)))