pathcontrol.tex

%!TEX root = main.tex
%% Makes figures available within scope of exercise folder.
%% e.g. the exercise in exercises/ohmslaw/cone.tex only
%% have to write \input{cylfig} instead of \input{figs/ohmslaw/cone/cylfig}
\makeatletter
\xdef\figuresPath{\@figrootDir/}
\gdef\fileInputPath{}
%:§ref
%:=\thisfilepath
%: Contains the path to the exercisefile relative to the build file.
%: Useful for inputing files in the same directory as an exercisefile.
%:-
\gdef\thisfilepath{} %<- current exercise path
\gdef\fileInputBase{}
% \providecommand*{\tstcommand}{HELLO}
\@ifundefined{input@path}{\gdef\input@path{}}{}
\AtBeginDocument{%
\providecommand*{\input@path}{}
\providecommand*{\Ginput@path}{}
\g@addto@macro\input@path{{\fileInputBase}{\fileInputPath}}%
\g@addto@macro\Ginput@path{{\fileInputBase}{\fileInputPath}}%
}
\At\PathControl{
  \makeatletter
  \xdef\figuresPath{\@figrootDir/}
  % Parse file and add \@figrootDir/path/to/directoryWithSameNameAsExerciseFile/
  % and \@figrootDir/path/to/ to the input stream
  \edef\exfile{\exerciseFile}
  \expandafter\filename@parse{\exfile}
  \xdef\thisfilepath{\@exercisesDir/\filename@area}
  \xdef\fileInputPath{\figuresPath\filename@area}
  \xdef\fileInputBase{\figuresPath\filename@area\filename@base/}
  \makeatother
}