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(compare-windows-whitespace): Doc fix.

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(compare-windows-sync, compare-windows-sync-string-size)
(compare-windows-recenter, compare-ignore-whitespace)
(compare-windows-highlight, compare-windows-face): New variables.
(compare-windows): Use compare-windows-sync.
(compare-windows-highlight, compare-windows-dehighlight)
(compare-windows-sync-regexp)
(compare-windows-sync-default-function): New functions.
This commit is contained in:
Richard M. Stallman 2003-10-20 23:31:51 +00:00
parent 59bb4146a3
commit 6166a68eef
1 changed files with 216 additions and 19 deletions
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235
lisp/compare-w.el
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@ -1,6 +1,6 @@
;;; compare-w.el --- compare text between windows for Emacs
;; Copyright (C) 1986, 1989, 1993, 1997 Free Software Foundation, Inc.
;; Copyright (C) 1986, 1989, 1993, 1997, 2003 Free Software Foundation, Inc.
;; Maintainer: FSF
;; Keywords: convenience files
@ -37,27 +37,100 @@
:group 'tools)
(defcustom compare-windows-whitespace "\\(\\s-\\|\n\\)+"
"*Regexp that defines whitespace sequences for \\[compare-windows].
"*Regexp or function that defines whitespace sequences for `compare-windows'.
That command optionally ignores changes in whitespace.
The value of `compare-windows-whitespace' is normally a regexp, but it
can also be a function. The function's job is to categorize any
whitespace around (including before) point; it should also advance
past any whitespace. The function is called in each buffer, with
past any whitespace. The function is called in each window, with
point at the current scanning point. It gets one argument, the point
where `compare-windows' was originally called; it should not look at
where \\[compare-windows] was originally called; it should not look at
any text before that point.
If the function returns the same value for both buffers, then the
If the function returns the same value for both windows, then the
whitespace is considered to match, and is skipped."
:type '(choice regexp function)
:group 'compare-w)
(defcustom compare-ignore-case nil
"*Non-nil means \\[compare-windows] ignores case differences."
(defcustom compare-ignore-whitespace nil
"*Non-nil means `compare-windows' ignores whitespace."
:type 'boolean
:group 'compare-w)
(defcustom compare-ignore-case nil
"*Non-nil means `compare-windows' ignores case differences."
:type 'boolean
:group 'compare-w)
(defcustom compare-windows-sync 'compare-windows-sync-default-function
"*Function or regexp that is used to synchronize points in two
windows if before calling `compare-windows' points are located
on mismatched positions.
The value of `compare-windows-sync' can be a function. The
function's job is to advance points in both windows to the next
matching text. If the value of `compare-windows-sync' is a
regexp, then points in both windows are advanced to the next
occurrence of this regexp.
The current default value is the general function
`compare-windows-sync-default-function' that is able to
synchronize points by using quadratic algorithm to find the first
matching 32-character string in two windows.
The other useful values of this variable could be such functions
as `forward-word', `forward-sentence', `forward-paragraph', or a
regexp containing some field separator or a newline, depending on
the nature of the difference units separator. The variable can
be made buffer-local.
If the value of this variable is `nil', then function `ding' is
called to beep or flash the screen when points are mismatched."
:type '(choice regexp function)
:group 'compare-w)
(defcustom compare-windows-sync-string-size 32
"*Size of string from one window that is searched in second window.
Small number makes difference regions more fine-grained, but it
may fail by finding the wrong match. The bigger number makes
difference regions more coarse-grained.
The default value 32 is good for the most cases."
:type 'integer
:group 'compare-w)
(defcustom compare-windows-recenter nil
"*List of two values, each of which is used as argument of
function `recenter' called in each of two windows to place
matching points side-by-side.
The value `(-1 0)' is useful if windows are split vertically,
and the value `((4) (4))' for horizontally split windows."
:type '(list sexp sexp)
:group 'compare-w)
(defcustom compare-windows-highlight t
"*Non-nil means compare-windows highlights the differences."
:type 'boolean
:group 'compare-w)
(defface compare-windows-face
'((((type tty pc) (class color))
(:background "turquoise3"))
(((class color) (background light))
(:background "paleturquoise"))
(((class color) (background dark))
(:background "paleturquoise4"))
(t (:underline t)))
"Face for highlighting of compare-windows difference regions."
:group 'compare-w)
(defvar compare-windows-overlay1 nil)
(defvar compare-windows-overlay2 nil)
(defvar compare-windows-sync-point nil)
;;;###autoload
(defun compare-windows (ignore-whitespace)
"Compare text in current window with text in next window.
@ -70,18 +143,34 @@ If both windows display the same buffer,
the mark is pushed twice in that buffer:
first in the other window, then in the selected window.
A prefix arg means ignore changes in whitespace.
The variable `compare-windows-whitespace' controls how whitespace is skipped.
If `compare-ignore-case' is non-nil, changes in case are also ignored."
A prefix arg means reverse the value of variable
`compare-ignore-whitespace'. If `compare-ignore-whitespace' is
nil, then a prefix arg means ignore changes in whitespace. If
`compare-ignore-whitespace' is non-nil, then a prefix arg means
don't ignore changes in whitespace. The variable
`compare-windows-whitespace' controls how whitespace is skipped.
If `compare-ignore-case' is non-nil, changes in case are also
ignored.
If `compare-windows-sync' is non-nil, then successive calls of
this command work in interlaced mode:
on first call it advances points to the next difference,
on second call it synchronizes points by skipping the difference,
on third call it again advances points to the next difference and so on."
(interactive "P")
(let* (p1 p2 maxp1 maxp2 b1 b2 w2
(progress 1)
(opoint1 (point))
opoint2
(skip-func (if ignore-whitespace
(if (stringp compare-windows-whitespace)
'compare-windows-skip-whitespace
compare-windows-whitespace))))
(skip-func (if (if ignore-whitespace ; XOR
(not compare-ignore-whitespace)
compare-ignore-whitespace)
(if (stringp compare-windows-whitespace)
'compare-windows-skip-whitespace
compare-windows-whitespace)))
(sync-func (if (stringp compare-windows-sync)
'compare-windows-sync-regexp
compare-windows-sync)))
(setq p1 (point) b1 (current-buffer))
(setq w2 (next-window (selected-window)))
(if (eq w2 (selected-window))
@ -99,9 +188,8 @@ If `compare-ignore-case' is non-nil, changes in case are also ignored."
(push-mark)
(while (> progress 0)
;; If both buffers have whitespace next to point,
;; If both windows have whitespace next to point,
;; optionally skip over it.
(and skip-func
(save-excursion
(let (p1a p2a w1 w2 result1 result2)
@ -124,10 +212,36 @@ If `compare-ignore-case' is non-nil, changes in case are also ignored."
(setq p1 (+ p1 progress) p2 (+ p2 progress)))
;; Advance point now rather than later, in case we're interrupted.
(goto-char p1)
(set-window-point w2 p2))
(set-window-point w2 p2)
(when compare-windows-recenter
(recenter (car compare-windows-recenter))
(with-selected-window w2 (recenter (cadr compare-windows-recenter)))))
(if (= (point) opoint1)
(ding))))
(if (not sync-func)
(ding)
;; If points are not advanced (i.e. already on mismatch position),
;; then synchronize points between both windows
(save-excursion
(setq compare-windows-sync-point nil)
(funcall sync-func)
(setq p1 (point))
(set-buffer b2)
(goto-char p2)
(funcall sync-func)
(setq p2 (point)))
(goto-char p1)
(set-window-point w2 p2)
(when compare-windows-recenter
(recenter (car compare-windows-recenter))
(with-selected-window w2 (recenter (cadr compare-windows-recenter))))
;; If points are still not synchronized, then ding
(when (and (= p1 opoint1) (= p2 opoint2))
;; Display error message when current points in two windows
;; are unmatched and next matching points can't be found.
(compare-windows-dehighlight)
(ding)
(message "No more matching points"))))))
;; Move forward over whatever might be called whitespace.
;; compare-windows-whitespace is a regexp that matches whitespace.
@ -135,7 +249,6 @@ If `compare-ignore-case' is non-nil, changes in case are also ignored."
;; and find the latest point at which a match ends.
;; Don't try starting points before START, though.
;; Value is non-nil if whitespace is found.
;; If there is whitespace before point, but none after,
;; then return t, but don't advance point.
(defun compare-windows-skip-whitespace (start)
@ -159,6 +272,90 @@ If `compare-ignore-case' is non-nil, changes in case are also ignored."
(or (/= beg opoint)
(/= end opoint))))
;; Move forward to the next synchronization regexp.
(defun compare-windows-sync-regexp ()
(if (stringp compare-windows-sync)
(re-search-forward compare-windows-sync nil t)))
;; Function works in two passes: one call on each window.
;; On the first call both matching points are computed,
;; and one of them is stored in compare-windows-sync-point
;; to be used when this function is called on second window.
(defun compare-windows-sync-default-function ()
(if (not compare-windows-sync-point)
(let* ((w2 (next-window (selected-window)))
(b2 (window-buffer w2))
(point-max2 (with-current-buffer b2 (point-max)))
(op2 (window-point w2))
(op1 (point))
(region-size compare-windows-sync-string-size)
(string-size compare-windows-sync-string-size)
in-bounds-p s1 p2 p12s p12)
(while (and
;; until matching points are found
(not p12s)
;; until size exceeds the maximum points of both buffers
;; (bounds below take care to not overdo in each of them)
(or (setq in-bounds-p (< region-size (max (- (point-max) op1)
(- point-max2 op2))))
;; until string size becomes smaller than 4
(> string-size 4)))
(if in-bounds-p
;; make the next search in the double-sized region;
;; on first iteration it is 2*compare-windows-sync-string-size,
;; on last iterations it exceeds both buffers maximum points
(setq region-size (* region-size 2))
;; if region size exceeds the maximum points of both buffers,
;; then start to halve the string size until 4;
;; this helps to find differences near the end of buffers
(setq string-size (/ string-size 2)))
(let ((p1 op1)
(bound1 (- (min (+ op1 region-size) (point-max)) string-size))
(bound2 (min (+ op2 region-size) point-max2)))
(while (< p1 bound1)
(setq s1 (buffer-substring-no-properties p1 (+ p1 string-size)))
(setq p2 (with-current-buffer b2
(goto-char op2)
(let ((case-fold-search compare-ignore-case))
(search-forward s1 bound2 t))))
(when p2
(setq p2 (- p2 string-size))
(setq p12s (cons (list (+ p1 p2) p1 p2) p12s)))
(setq p1 (1+ p1)))))
(when p12s
;; use closest matching points (i.e. points with minimal sum)
(setq p12 (cdr (assq (apply 'min (mapcar 'car p12s)) p12s)))
(goto-char (car p12))
(compare-windows-highlight op1 (car p12) op2 (cadr p12) b2))
(setq compare-windows-sync-point (or (cadr p12) t)))
;; else set point in the second window to the pre-calculated value
(if (numberp compare-windows-sync-point)
(goto-char compare-windows-sync-point))
(setq compare-windows-sync-point nil)))
;; Highlight differences
(defun compare-windows-highlight (beg1 end1 beg2 end2 buf2)
(when compare-windows-highlight
(if compare-windows-overlay1
(move-overlay compare-windows-overlay1 beg1 end1 (current-buffer))
(setq compare-windows-overlay1 (make-overlay beg1 end1 (current-buffer)))
(overlay-put compare-windows-overlay1 'face 'compare-windows-face)
(overlay-put compare-windows-overlay1 'priority 1))
(if compare-windows-overlay2
(move-overlay compare-windows-overlay2 beg2 end2 buf2)
(setq compare-windows-overlay2 (make-overlay beg2 end2 buf2))
(overlay-put compare-windows-overlay2 'face 'compare-windows-face)
(overlay-put compare-windows-overlay2 'priority 1))
;; Remove highlighting before next command is executed
(add-hook 'pre-command-hook 'compare-windows-dehighlight)))
(defun compare-windows-dehighlight ()
"Remove highlighting created by `compare-windows-highlight'."
(interactive)
(remove-hook 'pre-command-hook 'compare-windows-dehighlight)
(and compare-windows-overlay1 (delete-overlay compare-windows-overlay1))
(and compare-windows-overlay2 (delete-overlay compare-windows-overlay2)))
(provide 'compare-w)
;;; arch-tag: 4177aab1-48e6-4a98-b7a1-000ee285de46