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Re: guilev2 problem (user-markup-command sometimes not accepted)

From: David Kastrup
Subject: Re: guilev2 problem (user-markup-command sometimes not accepted)
Date: Mon, 12 Nov 2018 22:03:50 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

Thomas Morley <address@hidden> writes:

> Am Mo., 12. Nov. 2018 um 12:22 Uhr schrieb David Kastrup <address@hidden>:
>> Well, it's basically that macros run less synchronously with the rest
>> in Guilev2 compared to Guilev1.  That's because they are no longer an
>> entity of their own but rather a variation on syntax transforms.
>> define-markup-command compiles information the markup macro needs for
>> working, but the actual commands recording this information into data
>> structures are only executed at execution rather than macro expansion
>> time.  The problem with macro expansion time stuff is that it's very
>> fuzzy what parts of the execution environment may be present and what
>> not.  For example, closures are quite likely not to work at expansion
>> time.
>> I am not sure that it's even possible to let the markup macro
>> postpone things in a reasonable manner without obliterating all
>> advantages of using a macro in the first place.
> Many thanks for the detailed explanations.
> I'm afraid it will take some time for me to understand.

Once you do, you can explain it to me.  The above is basically
handwaving except that I have some experience where your hands will get
hurt if you choose to wave them there.  So it's constrained handwaving.

David Kastrup

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