\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{mkessler-bibliography}[2021-09-06 - Package to easily print bibliography and image attributions in document]
%%%%%%%%%%%%%%%%%%

\RequirePackage{xkeyval}

\newif\ifenglish\englishtrue
\DeclareOptionX{german}{\englishfalse}
\DeclareOptionX{english}{\englishtrue}

\def\mkessler@bibliography@bibfile{bibliography.bib}
\def\mkessler@bibliography@imagefile{images.bib}
\DeclareOptionX{bibfile}[bibliography.bib]{\def\mkessler@bibliography@bibfile{#1}}
\DeclareOptionX{imagefile}[images.bib]{\def\mkessler@bibliography@imagefile{#1}}

\DeclareOptionX*{\PackageWarning{mkessler-bibliography}{Unknown '\CurrentOption'}}
\ProcessOptionsX\relax

%%%%Bibliography management
\RequirePackage[backend=biber,style=alphabetic]{biblatex}
\addbibresource{\mkessler@bibliography@bibfile}
\addbibresource{\mkessler@bibliography@imagefile}

%Provide simpler commands to properly print image attributions and literature
\DeclareRobustCommand*{\printimageattributions}{
    \def\imageattributionstitle{\ifenglish Image attributions \else Bildquellen\fi}
    \phantomsection
    \addcontentsline{toc}{section}{\imageattributionstitle}
    \printbibliography[title={\imageattributionstitle}, type=image]
}

\DeclareRobustCommand*{\printliterature}{
    \def\literaturetitle{\ifenglish Literature\else Literatur\fi}
    \phantomsection
    \addcontentsline{toc}{section}{\literaturetitle}
    \printbibliography[title={\literaturetitle}, nottype=image]

}