60 lines
2.0 KiB
EmacsLisp
60 lines
2.0 KiB
EmacsLisp
;; Compare text between windows for Emacs.
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;; Copyright (C) 1986 Free Software Foundation, Inc.
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 1, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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(defun compare-windows ()
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"Compare text in current window with text in next window.
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Compares the text starting at point in each window,
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moving over text in each one as far as they match."
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(interactive)
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(let (p1 p2 maxp1 maxp2 b1 b2 w2
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success size
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(opoint (point)))
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(setq p1 (point) b1 (current-buffer))
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(setq w2 (next-window (selected-window)))
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(if (eq w2 (selected-window))
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(error "No other window."))
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(setq p2 (window-point w2)
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b2 (window-buffer w2))
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(setq maxp1 (point-max))
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(save-excursion
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(set-buffer b2)
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(setq maxp2 (point-max)))
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;; Try advancing comparing 1000 chars at a time.
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;; When that fails, go 500 chars at a time, and so on.
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(setq size 1000)
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(while (> size 0)
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(setq success t)
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(while success
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(setq size (min size (- maxp1 p1) (- maxp2 p2)))
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(save-excursion
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(set-buffer b2)
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(setq s2 (buffer-substring p2 (+ size p2))))
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(setq s1 (buffer-substring p1 (+ size p1)))
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(setq success (and (> size 0) (equal s1 s2)))
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(if success
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(setq p1 (+ p1 size) p2 (+ p2 size))))
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(setq size (/ size 2)))
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(goto-char p1)
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(set-window-point w2 p2)
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(if (= (point) opoint)
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(ding))))
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