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Re: 'mm' scaling value on top-level

From: David Kastrup
Subject: Re: 'mm' scaling value on top-level
Date: Wed, 29 Sep 2021 12:56:16 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Werner LEMBERG <> writes:

>>> OK, thanks for the pointer.  But I wonder what exactly the problem
>>> is: The paper size strings passed to `set-default-paper-size` *do*
>>> contain the 'mm' variable, see `paper-alist`.  Is the expansion of
>>> 'mm' delayed?  Isn't there a possibility to do the same on the top
>>> level?
>> You could probably pass the values in a similar quoted style that
>> then gets eval'ed within the paper context where the measurements
>> are defined:
>> %%%%
>> #(set-default-paper-size '(cons (* 55 mm) (* 89 mm)))
>> %%%%
>> [...]
> Thanks.  Attached is my next iteration.  This is almost what I want,
> however, I'm sure it's wrong in the details.  Reason:  It accepts
>   #(set-default-paper-size '(cons 100 50))
> (at the top level) but dislikes
>   #(set-default-paper-size '(100 . 50))
> How can I fix this?  Again, any pointers are much appreciated.

Well, sure.  (100 . 50) is not a Scheme expression you could evaluate.
You'd have to write

#(set-default-paper-size ''(100 . 50))

instead since you then need one quote level more.  Alternatively you
could call eval only when given a list or a symbol and just retain what
you got otherwise.  That may lead to somewhat inconsistent behavior.

David Kastrup

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