Hi Alex
Thank you very much for the explanation.
Best Regards
Dean

On 12 January 2017 at 15:58, Alexander Burger <a...@software-lab.de> wrote:

> Hi Dean,
>
> > I can match the (key) value of backspace to BS using 'if' but am not sure
> > how to using 'case'
> >
> > (setq BS "^?")
>
> Note that "^?" is DEL (ASCII 127), mapped to by some keyboard drivers when
> the
> backspace key is pressed.
>
> Backspace (ASCII 8) is "^H".
>
>
> > (setq Key (key))
> > (if (= Key BS) (prinl "yes BS")) #works fine when backspace is pressed
> > (case Key ("a" (prinl "a pressed"))) #works fine when "a" is pressed
> > (case Key (BS (prinl "BS pressed"))) #???
>
> 'case' does not evaluate the clauses. But as the value of BS is constant,
> you
> can use a read macro
>
>    (case Key (`BS (prinl "BS pressed")))
>
>
> But better catch both values:
>
>    (prinl
>       (case (key)
>          (("^H" "^?") "BS pressed")
>          (T "Other key pressed") ) )
>
> ♪♫ Alex
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