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\section{Custom Loader}
You can create a custom loader by defining a \verb|load|\{\textit{string}\} macro (or any other, if you are aware you need to change that in your main file for it to work) that uses the \verb|\dir| command to resolve the custom parts. 
Take a look at the \texttt{/include.tex} file for inspiration on how to do it, if you also want it to do case distinction.

You can also include some the pre-built configs from the \texttt{dist/} folder.