From: Hans Hagen via ntg-context <ntg-context@ntg.nl>
To: Benjamin Buchmuller <benjamin.buchmuller@gmail.com>
Cc: Hans Hagen <j.hagen@xs4all.nl>,
mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: How to make \def accept block or buffer as part of (long) command argument
Date: Sun, 2 Jan 2022 14:43:57 +0100 [thread overview]
Message-ID: <63920465-0dd4-f296-5ccc-e9cc8ec9bb4a@xs4all.nl> (raw)
In-Reply-To: <4F07B012-EB6C-4609-BAF0-2852C7CCD8B8@gmail.com>
On 1/2/2022 2:14 PM, Benjamin Buchmuller wrote:
> Thanks, Hans, for the answer, but I'm not sure if I get the point.
>
> While this is possible in ConTeXt:
>
> \startsection[title={My Title}]
>
> \beginMyBlock
> bla bla
> \endMyBlock
>
> \stopsection
>
> The following won't work (end of file error):
>
> \startMyCommand[optional={Maybe}]
>
> \beginMyBlock
> bla bla
> \endMyBlock
>
> \stopMyCommand
>
> I had hoped for a simple command/modifier like \pleaseacceptblocks\def\startMyCommand[#1]#2\stopMyCommand to have #2 work in a similar way.
>
> But maybe, as Wolfgang stated here (https://www.mail-archive.com/ntg-context@ntg.nl/msg73956.html), buffers and blocks can't be used in commands. (To add: Even when passed as arguments during compilation?)
You can bet that WS is right.
You really have to go dirty tex for this kind of magic:
\defineblock[MyBlock]
\keepblocks[MyBlock]
\starttext
\tolerant\def\startMyCommand[#1]%
{\begingroup
\setcatcodetable\notcatcodes
\dostartMyCommand[#1]}
\let\stopMyCommand\relax
\normalexpanded{\def\noexpand\dostartMyCommand[#1]#2\expandtoken\notcatcodes92
stopMyCommand}%
{\endgroup
% whatever #1 does
\setbuffer[foo]#2\endbuffer
\typebuffer[foo]
\getbuffer[foo]}
or
\normalexpanded{\def\noexpand\dostartMyCommand[#1]#2\retokenized\notcatcodes
{\stopMyCommand}}%
{\endgroup
% whatever #1 does
\setbuffer[foo]#2\endbuffer
\typebuffer[foo]
\getbuffer[foo]}
\startMyCommand[optional={Maybe}]
\beginMyBlock
bla bla
\endMyBlock
\stopMyCommand
\stoptext
and then of course further nesting mess ...
Hans
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next prev parent reply other threads:[~2022-01-02 13:43 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.440.1641107345.1172.ntg-context@ntg.nl>
2022-01-02 10:30 ` Dangerous bends symbol in manfnt.afm accidentally chopped by LMTX? Benjamin Buchmuller via ntg-context
2022-01-02 10:47 ` How to make \def accept block or buffer as part of (long) command argument Benjamin Buchmuller via ntg-context
2022-01-02 11:19 ` Hans Hagen via ntg-context
2022-01-02 13:14 ` Benjamin Buchmuller via ntg-context
2022-01-02 13:43 ` Hans Hagen via ntg-context [this message]
2022-01-02 17:06 ` Benjamin Buchmuller via ntg-context
2022-01-02 11:43 ` Dangerous bends symbol in manfnt.afm accidentally chopped by LMTX? Hans Hagen via ntg-context
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