Re: Info-search-isearch

[Juri Linkov <juri@jurta.org>]

Currently multi-node isearch in Info ignores word search.  It searches
for a sequence of words only in the current node.  But it is useful to
search for words through multiple Info nodes.  I think search in Info
should support nonincremental and "half-incremental" word search.

Word search what I call "half-incremental" is an undocumented
feature that allows almost incremental search by typing
`C-s M-e C-w WORDS C-s', i.e. it starts as nonincremental search,
and after typing the second C-s in the minibuffer it continues
as incremental search.  I discovered this feature accidentally.
Perhaps, it should be documented in the Emacs manual?

Below is an implementation of word search for Info isearch which
duplicated in Lisp the C function `wordify' used by word search.

Index: lisp/info.el
===================================================================
RCS file: /cvsroot/emacs/emacs/lisp/info.el,v
retrieving revision 1.417
diff -u -r1.417 info.el
--- lisp/info.el	23 Feb 2005 17:03:17 -0000	1.417
+++ lisp/info.el	25 Feb 2005 19:55:18 -0000
@@ -1646,10 +1646,16 @@
   (Info-search regexp bound noerror count 'backward))
 
 (defun Info-isearch-search ()
-  (if (and Info-isearch-search (not isearch-word))
+  (if Info-isearch-search
       (lambda (string &optional bound noerror count)
 	(condition-case nil
-	    (progn
+	    (if isearch-word
+		(Info-search (concat "\\b" (replace-regexp-in-string
+					    "\\W+" "\\\\W+"
+					    (replace-regexp-in-string
+					     "^\\W+\\|\\W+$" "" string)) "\\b")
+			     bound noerror count
+			     (unless isearch-forward 'backward))
 	      (Info-search (if isearch-regexp string (regexp-quote string))
 			   bound noerror count
 			   (unless isearch-forward 'backward))
@@ -1659,7 +1665,7 @@
       (isearch-search-fun))))
 
 (defun Info-isearch-wrap ()
-  (when (and Info-isearch-search (not isearch-word))
+  (when Info-isearch-search
     (if isearch-forward (Info-top-node) (Info-final-node))
     (goto-char (if isearch-forward (point-min) (point-max)))))

-- 
Juri Linkov
http://www.jurta.org/emacs/