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Emacs のバッファに対して cdif を実行する関数。本当は、コマンドの実行にした場合のエラー処理を入れたいんだが、やり方がわからない。失敗したら undo してください。
;;; cdif.el --- cdif and ansi-color interface
;;; Code:
(autoload 'ansi-color-apply-on-region "ansi-color" nil t)
(defun cdif-buffer (&optional prefix)
"Execute cdif command on current buffer and apply ansi-color."
(interactive "P")
(if prefix
(cdif-region (region-beginning) (region-end))
(cdif-region (point-min) (point-max))))
(defun cdif-region (begin end)
"Execute cdif command on region and apply ansi-color."
(interactive "r")
(let ((opoint (point))
(modified (buffer-modified-p)))
(set-mark end)
(goto-char begin)
;; shell-command-on-region returns exit status 1 for both successful
;; execution and command-not-found failure, and can't tell which.
(shell-command-on-region begin end "cdif --nocc --no256" t t nil t)
(message "applying ansi-color. can take a while.")
(ansi-color-apply-on-region (region-beginning) (region-end))
(message "done.")
;; save-excursion doesn't recover the point. why?
(goto-char opoint)
(set-buffer-modified-p modified)))
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