\ifdefined\minimmploaded
    \wlog{(skipped)}
    \expandafter\endinput\fi
\chardef\minimmploaded = \catcode`\:
\catcode`\: = 11

\input minim-alloc
\input minim-pdfresources

% a default catcode table
\newcatcodetable \minim:mp:catcodes:maketext
{\catcode`\:=12 \catcode`\@=12
    \savecatcodetable\csname minim:mp:catcodes:maketext\endcsname}
% and an empty catcode table for reading metapost code
\newcatcodetable \minim:mp:catcodes:mpcode
{\def\\{}\catcodetable\minim:initcatcodes
    \catcode`\{=1 \catcode`\}=2 \catcode9=10
    \catcode`\$=12 \catcode`\^=12 \catcode`\_=12 \catcode`\&=12
    \catcode`\#=12 \catcode`\%=12 \catcode`\~=12
    \catcode"0D=12 \savecatcodetable\csname\\minim:mp:catcodes:mpcode\endcsname}

\directlua { require('minim-mp') }

% The following are provided from the lua side.
%
% Note that only two of these are \protected – you are responsible for the 
% proper time and place of expansion of the others.
%
%   \closemetapostinstance \instance
%   \runmetapost           \instance { code } % \protected
%   \getnextmpimage        \instance
%   \getnamedmpimage       \instance {name}
%   \remainingmpimages     \instance
%   \boxnextmpimage        \instance box-nr
%   \boxnamedmpimage       \instance box-nr {name}

% \getallmpimages \instance
\newcount\mp:tmpcount
\protected\def\getallmpimages{%
    \afterassignment\getallmpimages:do\mp:tmpcount=}
\def\getallmpimages:do{\loop
    \ifnum \remainingmpimages\mp:tmpcount>0\relax
        \getnextmpimage\mp:tmpcount \repeat}

% \runmetapostimage \instance { code }
\protected\def\runmetapostimage{\begingroup
    \afterassignment\runmetapostimage:do\mp:tmpcount=}
\def\runmetapostimage:do{%
    \toksapp\everymp\mp:tmpcount{pre}{mp}{beginfig(0) }%
    \tokspre\everymp\mp:tmpcount{post}{mp}{ endfig;}%
    \toksapp\everymp\mp:tmpcount{post}{tex}{%
        \getallmpimages\mp:tmpcount \endgroup}%
    \runmetapost\mp:tmpcount}

% \directmetapost [ options ] { code }
\protected\def\directmetapost{%
    \withoptions[]\directmetapost:opt}
\long\def\directmetapost:opt[#1]{%
    \newmetapostinstance[#1]\:mpinst:
    \everymp\:mpinst:{post}{tex}{%
        \getallmpimages\:mpinst:
        \closemetapostinstance\:mpinst:}%
    \runmetapost\:mpinst:}

% \newmetapostinstance [ options ] \instance
\protected\def\newmetapostinstance{\withoptions[]\newmetapostinstance:}
\def\newmetapostinstance:[#1]#2{%
    \chardef#2=\directlua{
            tex.sprint(require('minim-mp').open{#1})
        }\relax}

% tex side of metapost instance initialisation
\newcount \mp:cur:inst
\newtoks \mp:init:env \mp:init:env{%
    % four token lists for every instance
    \expandafter\newtoks\csname mp:inst:pre:tex:\the\mp:cur:inst\endcsname
    \expandafter\newtoks\csname mp:inst:pre:mp:\the\mp:cur:inst\endcsname
    \expandafter\newtoks\csname mp:inst:post:mp:\the\mp:cur:inst\endcsname
    \expandafter\newtoks\csname mp:inst:post:tex:\the\mp:cur:inst\endcsname}
% the zeroth quarted applies to all
\mp:cur:inst=0 \the\mp:init:env \mp:cur:inst=-1

% \everymp \id {pre|post}{mp|tex} % accesses the above token lists
\def\everymp#1#2#3{\csname mp:inst:#2:#3:\the
    \ifcsname \string#1@instance\endcsname % for the latex environments
        \lastnamedcs\else\numexpr#1\fi
    \endcsname}

% combining the relevant toks registers
\newtoks\mp:inst:pre:tex \mp:inst:pre:tex{%
    \the\everymp0{pre}{tex}%
    \the\everymp\mp:cur:inst{pre}{tex}}
\newtoks\mp:inst:post:tex \mp:inst:post:tex{%
    \the\everymp\mp:cur:inst{post}{tex}%
    \the\everymp0{post}{tex}}
\newtoks\mp:mpcode % see lua function scan_mp_chunk()
\newtoks\mp:makempcode \mp:makempcode{%
    \edef\minim:mp:tmp{%
        \the\everymp0{pre}{mp}%
        \the\everymp\mp:cur:inst{pre}{mp}%
        \unexpanded{\the\mp:mpcode}%
        \the\everymp\mp:cur:inst{post}{mp}%
        \the\everymp0{post}{mp}}%
    \edef\minim:mp:tmp{\minim:mp:tmp}%
    \mp:mpcode=\expandafter{\minim:mp:tmp}}

% colour conversion: 1 grayscale 2 cmyk 3 rgb 4 rgb as spot
\newcount \convertmpcolours
\convertmpcolours = 0

\newcount\RtoG \RtoG = 2126
\newcount\GtoG \GtoG = 7152
\newcount\BtoG \BtoG = 0722

% miscellaneous bits and ends
\newtoks \everymaketext
\def\mpdim#1{\the\dimexpr#1\relax}

\catcode`\: = \minimmploaded