Wolfgang Schuster wrote:
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]}%
no need for toks
\expanded{\getparameters[\??md:#1:]\expandafter}\expandafter[\currentmoduleparameters]%
but maybe a \hetparameterscommand makes more sense -)
\processassignmentlist[#2]{\doabortmodule{#1}}%
\else
\getparameters[\??md:\currentmodule:][#1]%
\expanded{\getparameters[\??md:\currentmodule:][\the\scratchtoks]}%
\processassignmentlist[#1]{\doabortmodule\currentmodule}%
\fi
\let\currentmoduleparameters\empty}
but anyway, i wonder if we should go that route; normally context is
downward compatible and eventually mkiv will become more stable
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