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396 lines
16 KiB
EmacsLisp
396 lines
16 KiB
EmacsLisp
;;; compare-w.el --- compare text between windows for Emacs
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;; Copyright (C) 1986, 1989, 1993, 1997, 2001, 2002, 2003, 2004,
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;; 2005, 2006, 2007 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; Keywords: convenience files
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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 3, 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 the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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;; Boston, MA 02110-1301, USA.
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;;; Commentary:
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;; This package provides one entry point, compare-windows. It compares
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;; text starting from point in two adjacent windows, advancing point
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;; until it finds a difference. Option variables permit you to ignore
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;; whitespace differences, or case differences, or both.
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;;; Code:
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(defgroup compare-windows nil
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"Compare text between windows."
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:prefix "compare-"
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:group 'tools)
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(defcustom compare-windows-whitespace "\\(\\s-\\|\n\\)+"
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"*Regexp or function that defines whitespace sequences for `compare-windows'.
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That command optionally ignores changes in whitespace.
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The value of `compare-windows-whitespace' is normally a regexp, but it
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can also be a function. The function's job is to categorize any
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whitespace around (including before) point; it should also advance
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past any whitespace. The function is called in each window, with
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point at the current scanning point. It gets one argument, the point
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where \\[compare-windows] was originally called; it should not look at
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any text before that point.
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If the function returns the same value for both windows, then the
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whitespace is considered to match, and is skipped."
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:type '(choice regexp function)
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:group 'compare-windows)
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(defcustom compare-ignore-whitespace nil
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"*Non-nil means `compare-windows' ignores whitespace."
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:type 'boolean
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:group 'compare-windows
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:version "22.1")
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(defcustom compare-ignore-case nil
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"*Non-nil means `compare-windows' ignores case differences."
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:type 'boolean
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:group 'compare-windows)
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(defcustom compare-windows-sync 'compare-windows-sync-default-function
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"*Function or regexp that is used to synchronize points in two
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windows if before calling `compare-windows' points are located
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on mismatched positions.
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The value of `compare-windows-sync' can be a function. The
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function's job is to advance points in both windows to the next
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matching text. If the value of `compare-windows-sync' is a
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regexp, then points in both windows are advanced to the next
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occurrence of this regexp.
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The current default value is the general function
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`compare-windows-sync-default-function' that is able to
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synchronize points by using quadratic algorithm to find the first
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matching 32-character string in two windows.
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The other useful values of this variable could be such functions
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as `forward-word', `forward-sentence', `forward-paragraph', or a
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regexp containing some field separator or a newline, depending on
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the nature of the difference units separator. The variable can
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be made buffer-local.
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If the value of this variable is `nil' (option \"No sync\"), then
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no synchronization is performed, and the function `ding' is called
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to beep or flash the screen when points are mismatched."
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:type '(choice function regexp (const :tag "No sync" nil))
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:group 'compare-windows
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:version "22.1")
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(defcustom compare-windows-sync-string-size 32
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"*Size of string from one window that is searched in second window.
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Small number makes difference regions more fine-grained, but it
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may fail by finding the wrong match. The bigger number makes
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difference regions more coarse-grained.
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The default value 32 is good for the most cases."
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:type 'integer
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:group 'compare-windows
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:version "22.1")
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(defcustom compare-windows-recenter nil
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"*List of two values, each of which is used as argument of
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function `recenter' called in each of two windows to place
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matching points side-by-side.
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The value `(-1 0)' is useful if windows are split vertically,
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and the value `((4) (4))' for horizontally split windows."
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:type '(list sexp sexp)
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:group 'compare-windows
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:version "22.1")
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(defcustom compare-windows-highlight t
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"*Non-nil means compare-windows highlights the differences.
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The value t removes highlighting immediately after invoking a command
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other than `compare-windows'.
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The value `persistent' leaves all highlighted differences. You can clear
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out all highlighting later with the command `compare-windows-dehighlight'."
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:type '(choice (const :tag "No highlighting" nil)
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(const :tag "Persistent highlighting" persistent)
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(other :tag "Highlight until next command" t))
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:group 'compare-windows
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:version "22.1")
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(defface compare-windows
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'((t :inherit lazy-highlight))
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"Face for highlighting of compare-windows difference regions."
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:group 'compare-windows
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:version "22.1")
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(defvar compare-windows-overlay1 nil)
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(defvar compare-windows-overlay2 nil)
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(defvar compare-windows-overlays1 nil)
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(defvar compare-windows-overlays2 nil)
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(defvar compare-windows-sync-point nil)
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;;;###autoload
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(defun compare-windows (ignore-whitespace)
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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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This command pushes the mark in each window
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at the prior location of point in that window.
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If both windows display the same buffer,
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the mark is pushed twice in that buffer:
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first in the other window, then in the selected window.
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A prefix arg means reverse the value of variable
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`compare-ignore-whitespace'. If `compare-ignore-whitespace' is
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nil, then a prefix arg means ignore changes in whitespace. If
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`compare-ignore-whitespace' is non-nil, then a prefix arg means
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don't ignore changes in whitespace. The variable
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`compare-windows-whitespace' controls how whitespace is skipped.
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If `compare-ignore-case' is non-nil, changes in case are also
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ignored.
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If `compare-windows-sync' is non-nil, then successive calls of
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this command work in interlaced mode:
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on first call it advances points to the next difference,
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on second call it synchronizes points by skipping the difference,
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on third call it again advances points to the next difference and so on."
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(interactive "P")
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(if compare-ignore-whitespace
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(setq ignore-whitespace (not ignore-whitespace)))
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(let* (p1 p2 maxp1 maxp2 b1 b2 w2
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(progress 1)
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(opoint1 (point))
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opoint2
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skip-func-1
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skip-func-2
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(sync-func (if (stringp compare-windows-sync)
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'compare-windows-sync-regexp
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compare-windows-sync)))
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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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(setq w2 (next-window (selected-window) nil 'visible)))
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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 opoint2 p2)
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(setq maxp1 (point-max))
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(setq skip-func-1 (if ignore-whitespace
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(if (stringp compare-windows-whitespace)
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(lambda (pos)
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(compare-windows-skip-whitespace pos)
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t)
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compare-windows-whitespace)))
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(with-current-buffer b2
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(setq skip-func-2 (if ignore-whitespace
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(if (stringp compare-windows-whitespace)
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(lambda (pos)
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(compare-windows-skip-whitespace pos)
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t)
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compare-windows-whitespace)))
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(push-mark p2 t)
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(setq maxp2 (point-max)))
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(push-mark)
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(while (> progress 0)
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;; If both windows have whitespace next to point,
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;; optionally skip over it.
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(and skip-func-1
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(save-excursion
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(let (p1a p2a w1 w2 result1 result2)
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(setq result1 (funcall skip-func-1 opoint1))
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(setq p1a (point))
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(set-buffer b2)
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(goto-char p2)
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(setq result2 (funcall skip-func-2 opoint2))
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(setq p2a (point))
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(if (and result1 result2 (eq result1 result2))
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(setq p1 p1a
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p2 p2a)))))
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(let ((size (min (- maxp1 p1) (- maxp2 p2)))
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(case-fold-search compare-ignore-case))
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(setq progress (compare-buffer-substrings b2 p2 (+ size p2)
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b1 p1 (+ size p1)))
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(setq progress (if (zerop progress) size (1- (abs progress))))
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(setq p1 (+ p1 progress) p2 (+ p2 progress)))
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;; Advance point now rather than later, in case we're interrupted.
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(goto-char p1)
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(set-window-point w2 p2)
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(when compare-windows-recenter
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(recenter (car compare-windows-recenter))
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(with-selected-window w2 (recenter (cadr compare-windows-recenter)))))
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(if (= (point) opoint1)
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(if (not sync-func)
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(ding)
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;; If points are not advanced (i.e. already on mismatch position),
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;; then synchronize points between both windows
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(save-excursion
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(setq compare-windows-sync-point nil)
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(funcall sync-func)
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(setq p1 (point))
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(set-buffer b2)
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(goto-char p2)
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(funcall sync-func)
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(setq p2 (point)))
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(goto-char p1)
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(set-window-point w2 p2)
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(when compare-windows-recenter
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(recenter (car compare-windows-recenter))
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(with-selected-window w2 (recenter (cadr compare-windows-recenter))))
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;; If points are still not synchronized, then ding
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(when (and (= p1 opoint1) (= p2 opoint2))
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;; Display error message when current points in two windows
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;; are unmatched and next matching points can't be found.
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(compare-windows-dehighlight)
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(ding)
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(message "No more matching points"))))))
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;; Move forward over whatever might be called whitespace.
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;; compare-windows-whitespace is a regexp that matches whitespace.
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;; Match it at various starting points before the original point
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;; and find the latest point at which a match ends.
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;; Don't try starting points before START, though.
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;; Value is non-nil if whitespace is found.
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;; If there is whitespace before point, but none after,
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;; then return t, but don't advance point.
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(defun compare-windows-skip-whitespace (start)
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(let ((end (point))
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(beg (point))
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(opoint (point)))
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(while (or (and (looking-at compare-windows-whitespace)
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(<= end (match-end 0))
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;; This match goes past END, so advance END.
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(progn (setq end (match-end 0))
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(> (point) start)))
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(and (/= (point) start)
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;; Consider at least the char before point,
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;; unless it is also before START.
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(= (point) opoint)))
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;; keep going back until whitespace
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;; doesn't extend to or past end
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(forward-char -1))
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(setq beg (point))
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(goto-char end)
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(or (/= beg opoint)
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(/= end opoint))))
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;; Move forward to the next synchronization regexp.
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(defun compare-windows-sync-regexp ()
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(if (stringp compare-windows-sync)
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(re-search-forward compare-windows-sync nil t)))
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;; Function works in two passes: one call on each window.
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;; On the first call both matching points are computed,
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;; and one of them is stored in compare-windows-sync-point
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;; to be used when this function is called on second window.
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(defun compare-windows-sync-default-function ()
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(if (not compare-windows-sync-point)
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(let* ((w1 (selected-window))
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(w2 (next-window w1))
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(b2 (window-buffer w2))
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(point-max2 (with-current-buffer b2 (point-max)))
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(op2 (window-point w2))
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(op1 (point))
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(region-size compare-windows-sync-string-size)
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(string-size compare-windows-sync-string-size)
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in-bounds-p s1 p2 p12s p12)
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(while (and
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;; until matching points are found
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(not p12s)
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;; until size exceeds the maximum points of both buffers
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;; (bounds below take care to not overdo in each of them)
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(or (setq in-bounds-p (< region-size (max (- (point-max) op1)
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(- point-max2 op2))))
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;; until string size becomes smaller than 4
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(> string-size 4)))
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(if in-bounds-p
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;; make the next search in the double-sized region;
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;; on first iteration it is 2*compare-windows-sync-string-size,
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;; on last iterations it exceeds both buffers maximum points
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(setq region-size (* region-size 2))
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;; if region size exceeds the maximum points of both buffers,
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;; then start to halve the string size until 4;
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;; this helps to find differences near the end of buffers
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(setq string-size (/ string-size 2)))
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(let ((p1 op1)
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(bound1 (- (min (+ op1 region-size) (point-max)) string-size))
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(bound2 (min (+ op2 region-size) point-max2)))
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(while (< p1 bound1)
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(setq s1 (buffer-substring-no-properties p1 (+ p1 string-size)))
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(setq p2 (with-current-buffer b2
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(goto-char op2)
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(let ((case-fold-search compare-ignore-case))
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(search-forward s1 bound2 t))))
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(when p2
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(setq p2 (- p2 string-size))
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(setq p12s (cons (list (+ p1 p2) p1 p2) p12s)))
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(setq p1 (1+ p1)))))
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(when p12s
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;; use closest matching points (i.e. points with minimal sum)
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(setq p12 (cdr (assq (apply 'min (mapcar 'car p12s)) p12s)))
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(goto-char (car p12))
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(compare-windows-highlight op1 (car p12) (current-buffer) w1
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op2 (cadr p12) b2 w2))
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(setq compare-windows-sync-point (or (cadr p12) t)))
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;; else set point in the second window to the pre-calculated value
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(if (numberp compare-windows-sync-point)
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(goto-char compare-windows-sync-point))
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(setq compare-windows-sync-point nil)))
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;; Highlight differences
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(defun compare-windows-highlight (beg1 end1 b1 w1 beg2 end2 b2 w2)
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(when compare-windows-highlight
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(if compare-windows-overlay1
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(move-overlay compare-windows-overlay1 beg1 end1 b1)
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(setq compare-windows-overlay1 (make-overlay beg1 end1 b1))
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(overlay-put compare-windows-overlay1 'face 'compare-windows)
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(overlay-put compare-windows-overlay1 'priority 1000))
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(overlay-put compare-windows-overlay1 'window w1)
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(if compare-windows-overlay2
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(move-overlay compare-windows-overlay2 beg2 end2 b2)
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(setq compare-windows-overlay2 (make-overlay beg2 end2 b2))
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(overlay-put compare-windows-overlay2 'face 'compare-windows)
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(overlay-put compare-windows-overlay2 'priority 1000))
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(overlay-put compare-windows-overlay2 'window w2)
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(if (not (eq compare-windows-highlight 'persistent))
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;; Remove highlighting before next command is executed
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(add-hook 'pre-command-hook 'compare-windows-dehighlight)
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(when compare-windows-overlay1
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(push (copy-overlay compare-windows-overlay1) compare-windows-overlays1)
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(delete-overlay compare-windows-overlay1))
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(when compare-windows-overlay2
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(push (copy-overlay compare-windows-overlay2) compare-windows-overlays2)
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(delete-overlay compare-windows-overlay2)))))
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(defun compare-windows-dehighlight ()
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"Remove highlighting created by `compare-windows-highlight'."
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(interactive)
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(remove-hook 'pre-command-hook 'compare-windows-dehighlight)
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(mapc 'delete-overlay compare-windows-overlays1)
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(mapc 'delete-overlay compare-windows-overlays2)
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(and compare-windows-overlay1 (delete-overlay compare-windows-overlay1))
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(and compare-windows-overlay2 (delete-overlay compare-windows-overlay2)))
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(provide 'compare-w)
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;;; arch-tag: 4177aab1-48e6-4a98-b7a1-000ee285de46
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;;; compare-w.el ends here
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