Re: How run a command JUST on region highlighted by MOUSE?!?!

[Kevin Rodgers]

Christian Seberino wrote:

> I set .emacs up to run this function when I highlight a region with
> mouse
> and type C-ac.....
>
>  (defun cs-py-comment-region() (interactive)
>       (narrow-to-region)
>       (py-comment-region)
>       (delete-trailing-whitespace)
>       (widen))
>
> I'm getting this error message...
>
> cs-py-comment-region: Wrong number of arguments: #<subr narrow-to-region>, 0
> (New file)
> Mark set
> cs-py-comment-region: Wrong number of arguments: #<subr narrow-to-region>, 0
>
> I read Emacs LISP reference manual on narrow-to-region and it said..
>
> Command: narrow-to-region start end
>     This function sets the accessible portion of the current buffer to
> start at start and end at end. Both arguments should be character
> positions.
>
>     In an interactive call, start and end are set to the bounds of the
> current region (point and the mark, with the smallest first).
>
>
> I assume "interactive call" = "highlighted a region with mouse"??
>
> It seems narrow-to-region should get the start and end point values
> automatically??!

It does when you call it interactively.  When you call it programmatically,
you need to specify the START and END arguments: (region-beginning) and
(region-end), respectively.

Your cs-py-comment-region function should take 2 arguments, provide a
way for them to be specified when it's called interactively, and pass
the region bounds to py-comment-region:

(defun cs-py-comment-region (beg end)
  (interactive "r")
  (py-comment-region beg end)
  ...)

--
Kevin Rodgers