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Annotation of GNUtools/emacs/lisp/compare-w.el, revision 1.1.1.1

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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