spaces in isearch

[Richard Stallman <rms@gnu.org>]

I wrote these changes to isearch.el that take advantage of the new
search feature I just installed.  It fixes the bug, but has a
drawback: C-q SPC would no longer work as a way to search for a
literal space.  One would need to write [ ].  This is actually more
logical, but some users might be accustomed to C-q SPC.  What do
people think?


*** isearch.el	12 Oct 2004 04:45:09 -0400	1.242
--- isearch.el	20 Nov 2004 09:22:33 -0500	
***************
*** 112,117 ****
--- 112,119 ----
  (defcustom search-whitespace-regexp "\\(?:\\s-+\\)"
    "*If non-nil, regular expression to match a sequence of whitespace chars.
  This applies to regular expression incremental search.
+ When you put a space or spaces in the incremental regexp, it stands for
+ this, unless it is inside of a regexp construct such as [...] or *, + or ?.
  You might want to use something like \"\\\\(?:[ \\t\\r\\n]+\\\\)\" instead.
  In the Customization buffer, that is `\\(?:[' followed by a space,
  a tab, a carriage return (control-M), a newline, and `]+\\)'."
***************
*** 260,267 ****
      (define-key map "\r" 'isearch-exit)
      (define-key map "\C-j" 'isearch-printing-char)
      (define-key map "\t" 'isearch-printing-char)
-     (define-key map " " 'isearch-whitespace-chars)
-     (define-key map [?\S-\ ] 'isearch-whitespace-chars)
  
      (define-key map    "\C-w" 'isearch-yank-word-or-char)
      (define-key map "\M-\C-w" 'isearch-del-char)
--- 262,267 ----
***************
*** 485,491 ****
  Do incremental search forward for regular expression.
  With a prefix argument, do a regular string search instead.
  Like ordinary incremental search except that your input
! is treated as a regexp.  See \\[isearch-forward] for more info."
    (interactive "P\np")
    (isearch-mode t (null not-regexp) nil (not no-recursive-edit)))
  
--- 485,496 ----
  Do incremental search forward for regular expression.
  With a prefix argument, do a regular string search instead.
  Like ordinary incremental search except that your input
! is treated as a regexp.  See \\[isearch-forward] for more info.
! 
! In regexp incremental searches, a space or spaces normally matches
! any whitespace (the variable `search-whitespace-regexp' controls
! precisely what that means).  If you want to search for a literal space
! and nothing else, enter `[ ]'."
    (interactive "P\np")
    (isearch-mode t (null not-regexp) nil (not no-recursive-edit)))
  
***************
*** 1704,1725 ****
  	  (isearch-process-search-multibyte-characters char)
  	(isearch-process-search-char char)))))
  
- (defun isearch-whitespace-chars ()
-   "Match all whitespace chars, if in regexp mode.
- If you want to search for just a space, type \\<isearch-mode-map>\\[isearch-quote-char] SPC."
-   (interactive)
-   (if isearch-regexp
-       (if (and search-whitespace-regexp (not isearch-within-brackets)
- 	       (not isearch-invalid-regexp))
- 	  (isearch-process-search-string search-whitespace-regexp " ")
- 	(isearch-printing-char))
-     (progn
-       ;; This way of doing word search doesn't correctly extend current search.
-       ;;      (setq isearch-word t)
-       ;;      (setq isearch-adjusted t)
-       ;;      (goto-char isearch-barrier)
-       (isearch-printing-char))))
- 
  (defun isearch-process-search-char (char)
    ;; Append the char to the search string, update the message and re-search.
    (isearch-process-search-string
--- 1709,1714 ----
***************
*** 1960,1965 ****
--- 1949,1955 ----
        (let ((inhibit-point-motion-hooks search-invisible)
  	    (inhibit-quit nil)
  	    (case-fold-search isearch-case-fold-search)
+ 	    (search-spaces-regexp search-whitespace-regexp)
  	    (retry t))
  	(if isearch-regexp (setq isearch-invalid-regexp nil))
  	(setq isearch-within-brackets nil)
***************
*** 2373,2379 ****
  (defun isearch-lazy-highlight-search ()
    "Search ahead for the next or previous match, for lazy highlighting.
  Attempt to do the search exactly the way the pending isearch would."
!   (let ((case-fold-search isearch-case-fold-search))
      (funcall (isearch-search-fun)
               isearch-string
               (if isearch-forward
--- 2363,2370 ----
  (defun isearch-lazy-highlight-search ()
    "Search ahead for the next or previous match, for lazy highlighting.
  Attempt to do the search exactly the way the pending isearch would."
!   (let ((case-fold-search isearch-case-fold-search)
! 	(search-spaces-regexp search-whitespace-regexp))
      (funcall (isearch-search-fun)
               isearch-string
               (if isearch-forward