;;; -*- mode: emacs-lisp; indent-tabs-mode: nil -*-

(if (not noninteractive)

    (error "to be used only with -batch"))

;; Avoid vc-mode interference.

(setq vc-handled-backends nil)

;; for debugging

(defun report-tabs ()

  (let ((tab-found (search-forward "\t" nil t)))

    (if tab-found

        (message "Tab found @%s." tab-found)

      (message "No tabs found."))))

(defun whitespace-new ()

    ;; Sometimes whitespace-cleanup gets its internals confused

    ;; when whitespace-mode hasn't been activated on the buffer.

    (let ((whitespace-indent-tabs-mode indent-tabs-mode)

          (whitespace-style '(empty trailing)))

      ;; Only clean up tab issues if indent-tabs-mode is explicitly

      ;; set in the file local variables.

      (if (local-variable-p 'indent-tabs-mode)

          (progn

            (message "Enabling tab cleanups.")

            (add-to-list 'whitespace-style 'indentation)

            (add-to-list 'whitespace-style 'space-before-tab)

            (add-to-list 'whitespace-style 'space-after-tab)))

;;      (message "indent-tabs-mode=%s" indent-tabs-mode)

      (message "Cleaning whitespace...")

      (whitespace-cleanup)))

;; Old style whitespace.el uses different variables.

(defun whitespace-old ()

  (let (whitespace-check-buffer-indent

        whitespace-check-buffer-spacetab)

    (if (local-variable-p 'indent-tabs-mode)

        (progn

          (message "Enabling tab cleanups.")

          (setq whitespace-check-buffer-indent indent-tabs-mode)

          (setq whitespace-check-buffer-spacetab t)))

    (message "Cleaning whitespace...")

    (whitespace-cleanup)))

(while command-line-args-left

  (let ((filename (car command-line-args-left))

        ;; No backup files; we have version control.

        (make-backup-files nil))

    (find-file filename)

    (message "Read %s." filename)

    (if (not indent-tabs-mode)

        (progn

          (message "Untabifying...")

          (untabify (point-min) (point-max))))

    ;; Only reindent if the file C style is guessed to be "krb5".

    ;; Note that krb5-c-style.el already has a heuristic for setting

    ;; the C style if the file has "c-basic-offset: 4;

    ;; indent-tabs-mode: nil".

    (if (equal c-indentation-style "krb5")

        (c-indent-region (point-min) (point-max)))

    (if (fboundp 'whitespace-newline-mode)

        (whitespace-new)

      (whitespace-old))

    (save-buffer)

    (kill-buffer nil)

    (setq command-line-args-left (cdr command-line-args-left))))