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Annotation of GNUtools/emacs/lisp/compare-w.el, revision 1.1

1.1     ! root        1: ;; Compare text between windows for Emacs.
        !             2: ;; Copyright (C) 1986 Free Software Foundation, Inc.
        !             3: 
        !             4: ;; This file is part of GNU Emacs.
        !             5: 
        !             6: ;; GNU Emacs is free software; you can redistribute it and/or modify
        !             7: ;; it under the terms of the GNU General Public License as published by
        !             8: ;; the Free Software Foundation; either version 1, or (at your option)
        !             9: ;; any later version.
        !            10: 
        !            11: ;; GNU Emacs is distributed in the hope that it will be useful,
        !            12: ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            13: ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            14: ;; GNU General Public License for more details.
        !            15: 
        !            16: ;; You should have received a copy of the GNU General Public License
        !            17: ;; along with GNU Emacs; see the file COPYING.  If not, write to
        !            18: ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
        !            19: 
        !            20: 
        !            21: (defun compare-windows ()
        !            22:   "Compare text in current window with text in next window.
        !            23: Compares the text starting at point in each window,
        !            24: moving over text in each one as far as they match."
        !            25:   (interactive)
        !            26:   (let (p1 p2 maxp1 maxp2 b1 b2 w2
        !            27:           success size
        !            28:           (opoint (point)))
        !            29:     (setq p1 (point) b1 (current-buffer))
        !            30:     (setq w2 (next-window (selected-window)))
        !            31:     (if (eq w2 (selected-window))
        !            32:        (error "No other window."))
        !            33:     (setq p2 (window-point w2)
        !            34:          b2 (window-buffer w2))
        !            35:     (setq maxp1 (point-max))
        !            36:     (save-excursion
        !            37:      (set-buffer b2)
        !            38:      (setq maxp2 (point-max)))
        !            39: 
        !            40:     ;; Try advancing comparing 1000 chars at a time.
        !            41:     ;; When that fails, go 500 chars at a time, and so on.
        !            42:     (setq size 1000)
        !            43:     (while (> size 0)
        !            44:       (setq success t)
        !            45:       (while success
        !            46:        (setq size (min size (- maxp1 p1) (- maxp2 p2)))
        !            47:        (save-excursion
        !            48:         (set-buffer b2)
        !            49:         (setq s2 (buffer-substring p2 (+ size p2))))
        !            50:        (setq s1 (buffer-substring p1 (+ size p1)))
        !            51:        (setq success (and (> size 0) (equal s1 s2)))
        !            52:        (if success
        !            53:            (setq p1 (+ p1 size) p2 (+ p2 size))))
        !            54:       (setq size (/ size 2)))
        !            55: 
        !            56:     (goto-char p1)
        !            57:     (set-window-point w2 p2)
        !            58:     (if (= (point) opoint)
        !            59:        (ding))))

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