Compare the difference in PO fuzzy string

po-fuzzy-diff.el

;;; po-fuzzy-diff.el --- Compare the difference in PO fuzzy string

;; Copyright (C) 2013  Akihiro Motoki <amotoki@gmail.com>

;; Author: Akihiro Motoki <amotoki@gmail.com>
;; Keywords: convenience po-mode

;; This file is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; This file is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to
;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Commentary:

;; po-fuzzy-diff makes it easier to check the difference
;; in a PO fuzzy msgid string.
;; This command works only in po-mode.
;; Run this command around fuzzy msgid string in a PO file.

;;; Installation

;;   (require 'po-fuzzy-diff)
;;   (define-key po-mode-map "\M-=" 'po-fuzzy-diff)

;;; History:

;; 1.0: Initial revision

;;; Code:

(defun po-fuzzy-diff ()
  "Check a difference in fuzzy contents."
  (interactive)
  (let (begin end prevfile newfile diffbuf)
    (save-excursion
      (re-search-backward "^$" nil t)
      (setq begin (point))
      (re-search-forward "^msgstr " nil t)
      (beginning-of-line)
      (setq end (point))
      (goto-char begin)
      (if (not (and (re-search-forward "^#| msgid " nil t)
  	    (< (point) end)))
	  (error "Valid fuzzy section not found."))
      (beginning-of-line)
      (setq begin (point))
      ;; cut text from the original buffer
      (kill-ring-save begin end)
      ;; previous string
      (with-temp-buffer
	(yank)
	(goto-char (point-min))
	(re-search-forward "^msgid " nil t)
	(move-beginning-of-line nil)
	(kill-region (point) (point-max))

	(goto-char (point-min))
	(replace-regexp "^#| " "" nil (point-min) (point-max))
	(replace-regexp "^msgid " "" nil (point-min) (point-max))
	(replace-regexp "^\"" "" nil (point-min) (point-max))
	(replace-regexp "\"$" "" nil (point-min) (point-max))

	(setq prevfile (make-temp-file "podiff"))
	(write-region (point-min) (point-max) prevfile))
      (with-temp-buffer
	(yank)

	(goto-char (point-min))
	(replace-regexp "^msgid " "" nil (point-min) (point-max))
	(replace-regexp "^\"" "" nil (point-min) (point-max))
	(replace-regexp "\"$" "" nil (point-min) (point-max))

	(setq newfile (make-temp-file "podiff"))
	(write-region (point-min) (point-max) newfile))

      (setq diffbuf (diff prevfile newfile "-c" 'no-async))
      (set-buffer diffbuf)
      (toggle-read-only t)
      (set-buffer-modified-p nil)
      (pop-to-buffer diffbuf)
      (diff-hunk-next)

      (delete-file prevfile)
      (delete-file newfile))))

(provide 'po-fuzzy-diff)

;;; po-fuzzy-diff.el ends here