Re: if I set home key to this macro then shift+home does not select text in cua-mode

[Xah Lee]

On Nov 24, 4:21 pm, "Tolkin, Steve" <Steve.Tol...@FMR.COM> wrote:
> Summary: If I bind the home key to the macro below and press shift+home
> it does not select the text.
>
> Details:
> I am running GNU Emacs 22.3.1 on of 2008-09-96 on SOFT-MJASON. On
> windows XP SP2.
> This used to work in emacs 22.  I suspect the problem has to do with
> changes to cua-mode (which I have on) and/or transient mark-mode (which
> I explicitly set on in v. 22,but now seems to be part of cua-mode.)
>
> Here is the macro definition:
>
> ;; Posted to comp.emacs by:
> ;; Kai Grossjohann <Kai.Grossjoh...@CS.Uni-Dortmund.DE>
> (defun my-home ()
>   "Toggle the point between the beginning of the current line, and the
> first non-whitespace character on the line."
>   (interactive)
>   (let ((pos (save-excursion (back-to-indentation) (point))))
>     (if (equal pos (point))
>         (beginning-of-line)
>       (back-to-indentation))))
>
>  (global-set-key [home] 'my-home)
>
> My current workaround is simply to comment out the global-set-key line.
> Is there a fix to the macro to get the old behavior?  Even better would
> be something already in cua-mode or simple.el etc that i could use.
>
> Note: I am now also sending this to help-gnus-emacs because it was
> suggested on the h-e-w list that this was not specific to Windows.


Few notes and answers.

• what you called a macro is not a macro. It is just a lisp function,
or call it user written emacs command. A macro in emacs has 2
meanings: keyboard macro, and elisp macro. Keyboard macro is software
application feature that allows you to record your keystrokes and play
them back. It's purpose is to let you do a lot automations. As a
example, a OS wide macro system is QuicKeys. A lisp macro is a fetarue
of the computer language that allows you do do source code
transformation. In some sense, it is a crude form of term rewriting
languages. (e.g. Mathematica)

you can read about these here:

http://en.wikipedia.org/wiki/Macro_(computer_science)
http://en.wikipedia.org/wiki/Rewriting
http://en.wikipedia.org/wiki/Mathematica

As to your question, you can make it work by this:

(add-hook 'cua-mode-hook
 (lambda ()
    (put 'my-home 'CUA 'move)
   )
 )

probably best to rename your function to something more descriptive,
such as
line-beginning-dwim . (the “dwim” means “do what i mean”, as in
comment-dwim.)

also, you might be interested in these commands:

just-one-space
delete-horizontal-space

both have default keyboard shortcuts.

  Xah
∑ http://xahlee.org/

☄