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Re: spaces in isearch

From: Juri Linkov
Subject: Re: spaces in isearch
Date: Sun, 21 Nov 2004 19:09:48 +0200
User-agent: Gnus/5.110002 (No Gnus v0.2) Emacs/21.3.50 (gnu/linux)

Alex Schroeder <address@hidden> writes:
> Juri Linkov <address@hidden> writes:
>> Since C-q in isearch mode is processed by isearch-quote-char,
>> it could intercept SPC and insert [ ] into the search string.
> I'm not sure I like that.  C-q <something> should insert <something>,

No, C-q <something> should be used to insert <something_different>.
There is no sense to use C-q <something> to insert the same <something>.

> I didn't know about the special behaviour of <space> in
> isearch-forward-regexp.

The old behavior: SPC inserts \\(?:\\s-+\\), C-q SPC inserts SPC.
The new behavior: SPC inserts SPC (which now internally means \\(?:\\s-+\\)).

So C-q SPC inserting SPC has no sense anymore since SPC now is
inserted by SPC itself.

Moreover, to achieve backward compatibility for users using C-q SPC
to match just a space, C-q SPC should do something to preserve the
literal meaning of a space.  Adding [ ] to the search string in regexp
isearch mode is the most natural thing to do.

>From implementation point of view this means moving the old code from
`isearch-whitespace-chars' to `isearch-quote-char' and replacing

    (isearch-process-search-string search-whitespace-regexp " ")


    (isearch-process-search-string "[ ]" " ")

Juri Linkov

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