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Re: symbols verses words


From: Tassilo Horn
Subject: Re: symbols verses words
Date: Thu, 03 Mar 2011 11:19:57 +0100
User-agent: Gnus/5.110014 (No Gnus v0.14) Emacs/24.0.50 (gnu/linux)

Perry Smith <address@hidden> writes:

Hi Perry,

> I need some help understanding Emac's design.  I use a lot of "word"
> constructs where I *think* I should be using symbol.  For example, if
> I'm writing C code and I want to find foo but not foo_bar, I usually
> do \<foo\> but really it seems that I should be doing \_<foo\_>
> ... fine.  I can make that adjustment.  But when I do incremental
> search, I often hit ^w to pull in the next word but what I really want
> (often but not always) is to pull in the next symbol (into the search
> string).  So if I'm sitting at this_that, I'd ilke to hit ^W (perhaps)
> and pull in this_that instead of just this.

I think, something like that should do the trick:

--8<---------------cut here---------------start------------->8---
(defun isearch-yank-symbol-or-char ()
  "Pull next character or symbol from buffer into search string."
  (interactive)
  (isearch-yank-internal
   (lambda ()
     (if (or (memq (char-syntax (or (char-after) 0)) '(?w ?_))
             (memq (char-syntax (or (char-after (1+ (point))) 0)) '(?w ?_)))
         (forward-symbol 1)
       (forward-char 1))
     (point))))

(define-key isearch-mode-map (kbd "C-S-w") 'isearch-yank-symbol-or-char)
--8<---------------cut here---------------end--------------->8---

So when you are on a word constituent (?w) or on a symbol constituent
(?_), then do `forward-symbol', else `forward-char'.

Bye,
Tassilo




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