Re: more than one prefix argument

["Andreas Röhler" <andreas.roehler@easy-emacs.de>]

Am 26.07.2011 22:10, schrieb Daniel Colascione:
> On 7/26/11 12:59 PM, Andreas Röhler wrote:
>> Hi,
>>
>> what about allowing more than one prefix argument
>> by making interactive codes "p" and "P" sending
>> truly separated.
>>
>
> We already have more than one kind of prefix argument: see
> universal-coding-system-argument for an example.  You can already define as many
> kinds of "prefix argument" as you'd like: just define a global flag and a
> command to set that flag, and have post-command-hook clear the flag unless (eq
> this-command 'my-prefix-setting-function).
>

Hi,

yes I can, thanks for the hints, which will be helpful.

Let may say however that things like

21.12 Prefix Command Argument

tells it, might be easier, more clear implemented IMHO, it reads:


    Here are the possible values of a raw prefix argument:

    * `nil', meaning there is no prefix argument.  Its numeric value is
      1, but numerous commands make a distinction between `nil' and the
      integer 1.

    * An integer, which stands for itself.

    * A list of one element, which is an integer.  This form of prefix
      argument results from one or a succession of `C-u''s with no
      digits.  The numeric value is the integer in the list, but some
      commands make a distinction between such a list and an integer
      alone.

;;;;;;;;;;

well, it's great:

numerous commands make a distinction between `nil' and the
      integer 1.

;;;;;;;;;

Indeed: (prefix-numeric-value nil) -->1
But does this make sense in a lisp-environement?

Booleans treat nil and 1 different:

(when 1 (message "%s" "1"))-->1
(when nil (message "%s" "1"))-->nil

Cheers,

Andreas