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Re: Problem using search-forward


From: Eric Abrahamsen
Subject: Re: Problem using search-forward
Date: Mon, 08 Oct 2012 12:10:21 +0800
User-agent: Gnus/5.130006 (Ma Gnus v0.6) Emacs/24.2.50 (gnu/linux)

On Mon, Oct 08 2012, Tassilo Horn wrote:

> Bob Shanley <address@hidden> writes:
>
> Hi Bob,
>
>> ; These do not:
>> ;   (defun eol ( ) (end-of-line) (point))
>> ;   (search-forward ");" (eol))
>> ;   (let ( (n (eol)) ) (message "this is the value %d" n) (search-forward 
>> ");" n))
>> ; They result in a Search failed: ");" and point moves to end of line
>> ; What am I missing?
>
> The `end-of-line' call already moves point to the end of line, thus you
> bound the search to the same position where it starts.  Try this
> definition of `eol'.
>
>   (defun eol ()
>     (save-excursion
>      (end-of-line)
>      (point)))

I may be missing something here, but isn't this what (point-at-eol) does?

> ,----[ C-h f save-excursion RET ]
> | save-excursion is a special form in `C source code'.
> | 
> | (save-excursion &rest BODY)
> | 
> | Save point, mark, and current buffer; execute BODY; restore those things.
> | Executes BODY just like `progn'.
> | The values of point, mark and the current buffer are restored
> | even in case of abnormal exit (throw or error).
> | The state of activation of the mark is also restored.
> | 
> | This construct does not save `deactivate-mark', and therefore
> | functions that change the buffer will still cause deactivation
> | of the mark at the end of the command.  To prevent that, bind
> | `deactivate-mark' with `let'.
> | 
> | If you only want to save the current buffer but not point nor mark,
> | then just use `save-current-buffer', or even `with-current-buffer'.
> `----
>
> Bye,
> Tassilo
>
>
>

-- 
GNU Emacs 24.2.50.1 (i686-pc-linux-gnu, GTK+ Version 3.4.4)
 of 2012-10-03 on pellet




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