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%D \module
%D [ file=syst-lua,
%D version=2008.01.25,
%D title=\CONTEXT\ System Macros,
%D subtitle=Helper macros based on \LUA,
%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.
\registerctxluafile{syst-lua}{1.001}
\unprotect
\def\expdoifelse#1#2{\clf_doifelsesame{#1}{#2}}
\def\expdoif #1#2{\clf_doifsame {#1}{#2}}
\def\expdoifnot #1#2{\clf_doifnotsame {#1}{#2}}
% \testfeatureonce{100000}{\doifelse{hello world}{here i am}{}} % 0.3
% \testfeatureonce{100000}{\expandabledoifelse{hello world}{here i am}{}} % 1.5
\def\expdoifelsecommon#1#2{\clf_doifelsecommon{#1}{#2}}
\def\expdoifelseinset #1#2{\clf_doifelseinset {#1}{#2}}
\def\expdoifcommonelse\expdoifelsecommon
\def\expdoifinsetelse \expdoifelseinset
% we define these here, just in case ...
\def\luastringsep{===} % this permits \typefile{self} otherwise nested b/e sep problems
\edef\!!bs{[\luastringsep[}
\edef\!!es{]\luastringsep]}
\unexpanded\def\writestatus#1#2{\clf_writestatus{#1}{#2}}
% A handy helper:
% \def\luaexpr#1{\ctxlua{context(tostring(#1))}} % more efficient:
% We can omit the tex.ctxcatcodes here as nowadays we seldom
% change the regime at the \TEX\ end:
\def\luaexpr#1{\ctxlua{tex.print(tostring(#1))}} % no use is shortcutting has to be compiled
% helpers:
\def\ui_fo #1{#1}
\def\ui_go #1{}
\def\ui_ft#1#2{#1}
\def\ui_st#1#2{#2}
%D Let's bring this under \LUA\ (and therefore \MKIV\ sandbox) control:
% \setnewconstant\c_syst_write 18
%
% \unexpanded\def\write#1#% so we can handle \immediate
% {\ifnum#1=\c_syst_write
% \expandafter\syst_execute
% \else
% \normalwrite#1%
% \fi}
%
% \unexpanded\def\syst_execute#1%
% {\ctxlua{os.execute(\!!bs#1\!!es)}}
%D But as we only use write 16 we could as well do all in \LUA\
%D and ignore the rest. Okay, we still can do writes here but only
%D when not blocked.
% Nicer would be if we could just disable write 18 and keep os.execute
% which in fact we can do by defining write18 as macro instead of
% primitive ... todo.
% \unexpanded\def\write#1#%
% {\syst_write{#1}}
%
% \def\syst_write#1#2%
% {\ctxcommand{write(\number#1,\!!bs\normalunexpanded{#2}\!!es)}}
%
% \unexpanded\def\writeviatex#1#2%
% {\ifx\normalwrite\relax\else
% \normalwrite#1{#2}%
% \fi}
% we have no way yet to pickup \immediate unless we redefine it
% we assume immediate execution
\let\syst_write_execute\clf_execute % always {...}
\unexpanded\def\write#1#%
{\ifnum#1=18
\expandafter\syst_write_execute
\else
\normalwrite#1%
\fi}
\protect \endinput
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