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

% at the moment, this file only deals with pgf compatibility. if you do not use 
% pgf, you only need the lua module.

\directlua{ require 'minim-pdfresources' }

% 1 pgf compatibility

% this ballet inserts our fix directly at the end of pgfsys-luatex.def
% (see the \ProvidesFile redefinition in minim-alloc.tex)
\expandafter\def\csname minim:intercept:pgfsys-luatex.def\endcsname
   {\wlog{minim: applying pgf patches...}\newtoks\minim:pgf:fix:toks
    \minim:pgf:fix:toks\csname pgfutil@everybye\endcsname
    \let\endinput=\minim:pgf:fix:endinput}
\def\minim:pgf:fix:endinput{%
    \begincsname minim:pgf:fix:\minim:currentfile\endcsname
    \minim:endinput}
\expandafter\def\csname minim:pgf:fix:pgfsys-luatex.def\endcsname{%
    \csname pgfutil@everybye\endcsname\minim:pgf:fix:toks \minim:pgf:fix:common
    \let\endinput=\minim:endinput \wlog{minim: done applying pgf patches}}

\def\minim:pgf:fix:common{\directlua{%
    local pdfres = require 'minim-pdfresources'
    pdfres.add_global_resource('ExtGState', nil,
        '\luaescapestring{\csname pgf@sys@pgf@resource@list@extgs\endcsname}')
    pdfres.add_global_resource('Pattern', nil,
        '\luaescapestring{\csname pgf@sys@pgf@resource@list@patterns\endcsname}')
    pdfres.add_global_resource('ColorSpace', nil,
        '\luaescapestring{\csname pgf@sys@pgf@resource@list@colorspaces\endcsname}')}
    \expandafter\let\csname pgf@sys@pdf@possible@resources\endcsname = \empty
    \minim:pgf:fix:luaside \pdfvariable pageresources{}}

% if pgf has already been loaded, copy the already-defined resources
\ifcsname pgf@sys@pdf@extgs@objnum\endcsname \minim:pgf:fix:common
    % three empty registers will be written at the end. having three unused 
    % empty objects in the pdf is not ideal, but will not lead to problems.
    \expandafter\let\csname pgf@sys@pgf@resource@list@extgs\endcsname = \empty
    \expandafter\let\csname pgf@sys@pgf@resource@list@patterns\endcsname  = \empty
    \expandafter\let\csname pgf@sys@pgf@resource@list@colorspaces\endcsname = \empty
\fi

% 

\catcode`\:=\minimpdfresourcesloaded
\endinput

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