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%D \module
%D [ file=back-ini,
%D version=2009.04.15,
%D title=\CONTEXT\ Backend Macros,
%D subtitle=Initialization,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
\writestatus{loading}{ConTeXt Backend Macros / Initialization}
\registerctxluafile{back-ini}{}
\unprotect
%D Right from the start \CONTEXT\ had a backend system based on runtime pluggable
%D code. As most backend issues involved specials and since postprocessors had not
%D that much in common, we ended up with a system where we could switch backend as
%D well as output code for multiple backends at the same time.
%D
%D Because \LUATEX\ has the backend built in, and since some backend issues have
%D been moved to the frontend I decided to provide new backend code for \MKIV,
%D starting with what was actually used.
%D
%D At this moment \DVI\ is no longer used for advanced document output and we
%D therefore dropped support for this format. Future versions might support more
%D backends again, but this has a low priority.
%D The exact page model depends on the backend so we just define some variables that
%D are used. A helper at the \LUA\ end will synchronize with the internal variables.
%D We store these in the format.
\ifdefined\everybackendshipout \else \newtoks\everybackendshipout \fi
\ifdefined\everylastbackendshipout \else \newtoks\everylastbackendshipout \fi
\ifdefined\everybackendlastinshipout \else \newtoks\everybackendlastinshipout \fi
\installcorenamespace{backend}
\installsetuponlycommandhandler \??backend {backend}
%D \starttyping
%D \setupbackend[space=yes]
%D \stoptyping
\appendtoks
\clf_setrealspaces{\backendparameter\c!space}%
\to \everysetupbackend
\appendtoks
\ifdefined\clf_resetmapfile
\clf_resetmapfile
\fi
\to \everysetupbackend
%D For the moment this is an experiment (defauls is pdf, but we also
%D have lua, json and mps).
%D
%D \starttyping
%D % \setupoutput[lua]
%D % \setupoutput[json]
%D % \setupoutput[mps]
%D % \setupoutput[none] % for testing only
%D % \setupoutput[empty] % for testing only
%D
%D \starttext
%D \dorecurse{1000}{
%D {\tf \red \samplefile{tufte}} \par
%D {\bf \green \samplefile {ward}} \par
%D {\sl \blue \samplefile{davis}} \par
%D }
%D \stoptext
%D \stoptyping
\unexpanded\def\setupoutput[#1]%
{\clf_enabledriver{#1}}
\protect \endinput
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