[Tex/LaTex] Overwrite pdfbookmarks created by \addcontentsline

bookmarkshyperrefpdftable of contents

I want a bookmark called "Frontmatter" at level=0 and bookmarks for "Preface", "Acknowledgements" and "Contents" at level=1.

My problem is that \addcontentsline{toc}{chapter}{<x>} automatically creates bookmarks at chapter level (level=0) and I don't how to overwrite them with bookmarks at level=1. The lines I commented out in the below MWE indicate the structure of the bookmarks I would like to have. The bookmark package seems not be provide a solution either, hence I didn't load it in the MWE.

\documentclass{book}

\usepackage{lipsum}
\usepackage{hyperref}

\begin{document}

\frontmatter

%\pdfbookmark[0]{Frontmatter}{frontmatter}
\chapter*{Preface}
%\pdfbookmark[1]{Preface}{preface}
\addcontentsline{toc}{chapter}{Preface}
\lipsum[1]

\chapter*{Acknowledgements}
%\pdfbookmark[1]{Acknowledgements}{acknowledgements}
\addcontentsline{toc}{chapter}{Acknowledgements}
Thanks to everyone for everything.

\cleardoublepage
\pdfbookmark[0]{Contents}{toc}
%\pdfbookmark[1]{Contents}{toc}
\tableofcontents

\mainmatter

\chapter{Lipsum 2}
\lipsum[2]

\end{document}

Best Answer

Also in this case package bookmark can help. The bookmark "Frontmatter" can be added at part level and at \mainmatter the bookmark hierarchy is restarted using option startatroot.

\documentclass{book}

\usepackage{lipsum}
\usepackage{hyperref}
\usepackage{bookmark}

\begin{document}

\frontmatter

\pdfbookmark[-1]{Frontmatter}{frontmatter}
\chapter*{Preface}
\addcontentsline{toc}{chapter}{Preface}
\lipsum[1]

\chapter*{Acknowledgements}
\addcontentsline{toc}{chapter}{Acknowledgements}
Thanks to everyone for everything.

\cleardoublepage
\pdfbookmark[0]{Contents}{toc}
\tableofcontents

\bookmarksetup{startatroot}
\mainmatter

\chapter{Lipsum 2}
\lipsum[2]

\end{document}

An alternative solution would be the redefinition of \toclevel@chapter to 1 and resetting after the frontmatter.

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