(defvar scala-packages
  '(
    ensime
    sbt-mode
    scala-mode2
    noflet
    )
  "List of all packages to install and/or initialize. Built-in packages
which require an initialization must be listed explicitly in the list.")

(defun spacemacs/init-ensime ()
  (use-package ensime
    :commands (ensime-mode)
    :init
    (add-hook 'scala-mode-hook 'ensime-mode)
    :config
    (progn
      (evil-define-key 'normal scala-mode-map "J" 'spacemacs/scala-join-line)

      (evil-define-key 'normal ensime-popup-buffer-map
        (kbd "q") 'ensime-popup-buffer-quit-function)

      (evil-define-key 'normal ensime-refactor-info-map
        (kbd "q") 'spacemacs/ensime-refactor-cancel
        (kbd "c") 'spacemacs/ensime-refactor-accept
        (kbd "RET") 'spacemacs/ensime-refactor-accept)

      (evil-define-key 'normal ensime-compile-result-map
        (kbd "g") 'ensime-show-all-errors-and-warnings
        (kbd "TAB") 'forward-button
        (kbd "<backtab>") 'backward-button
        (kbd "M-n") 'forward-button
        (kbd "M-p") 'backward-button)

      ;; Don't use scala checker if ensime mode is active, since it provides
      ;; better error checking.

      (eval-after-load 'flycheck
        '(progn
           (defun spacemacs/flycheck-use-scalastyle ()
             (when ensime-mode
               (flycheck-select-checker 'scala-scalastyle)))

           (add-hook 'flycheck-before-syntax-check-hook
                     'spacemacs/flycheck-use-scalastyle))))))

(defun spacemacs/init-scala-mode2 ()
  (use-package scala-mode2
    :defer t
    :init
    (dolist (ext '(".cfe" ".cfs" ".si" ".gen" ".lock"))
      (add-to-list 'completion-ignored-extensions ext))
    :config
    (progn
      ;; Compatibility with `aggressive-indent'
      (custom-set-variables
       (scala-indent:align-forms t)
       (scala-indent:align-parameters t)
       (scala-indent:default-run-on-strategy scala-indent:operator-strategy))

      (defadvice scala-indent:indent-code-line (around retain-trailing-ws activate)
        "Keep trailing-whitespace when indenting."
        (noflet ((scala-lib:delete-trailing-whitespace ()))
          ad-do-it)))))