# [dev-context] Mac installation package

Mon Aug 24 23:55:31 CEST 2009

Am 24.08.2009 um 16:27 schrieb Aditya Mahajan:

>>>> To stop the TeX run we can have
>>>> \setupmodule[contextversion=2009.08.22]
>>>> at the begin of a module and ConTeXt will abort the run if the
>>>> key 'contextversion' has a value and context is older than the
>>>> user has requested.
>>> Do you want this to check to be part of the definition of
>>> \setupmodule? One difficultly that I see is that typically this
>>> will mean that we need to set this separately for each engine.
>>
>> I don't need such a check, it was Olivers idea and I thought about
>> a idea how this
>> can be integrated without introducing a new command which breaks
>> backward compatibility.
>
> I meant that when you said
> \setupmodule[contextversion=...]", what is the implementation you
> had in mind. \setupmodule macro doing the checking, or the module
> writer doing the checking.

I think it's up to the developer to write something in the module,
e.g. http://bitbucket.org/wolfs/simplefonts/src/46a1f454bccc/files/t-simplefonts.tex
but it's not so hard to integrate it into the \setupmodule command.

% untested, it should only show how \setupmodule can be extended to
stop a tex run
% when a module is used with a too old context version

\def\c!contextversion{contextversion}

\def\doabortmodule#1#2#3%
{\doif{#2}\c!contextversion{\doifolderversionelse\contextversion{#3}
{\forcequitjob{#1}}\donothing}}

\def\dosetupmodule[#1][#2]%
{\scratchtoks\expandafter{\currentmoduleparameters}%
\ifsecondargument
\getparameters[\??md:#1:][#2]%
\expanded{\getparameters[\??md:#1:][\the\scratchtoks]}%
\processassignmentlist[#2]{\doabortmodule{#1}}%
\else
\getparameters[\??md:\currentmodule:][#1]%
\expanded{\getparameters[\??md:\currentmodule:][\the
\scratchtoks]}%
\processassignmentlist[#1]{\doabortmodule\currentmodule}%
\fi
\let\currentmoduleparameters\empty}

Wolfgang