Set chapters at section level in the table of contents

Question

I have

\chapter{My first chapter}
\chapter{My second chapter}
\phantomsection
\addcontentsline{toc}{chapter}{Appendixes}
\appendix
\makeatletter
\def\toclevel@chapter{1}\def\toclevel@section{2}
\makeatother
\chapter{My first appendix}
\chapter{My second appendix}

So my hyperref ToC look like:

- My first chapter
- My second chapter
+ Appendixes
  - My first appendix
  - My second appendix

But my \tableofcontents still look like:

1 My first chapter
2 My second chapter
Appendixes
A My first appendix
B My second appendix

And what I want is that the appendixes look like sections:

1 My first chapter
2 My second chapter
Appendixes
  A My first appendix
  B My second appendix

I can figure out, that there is a really small trick to do the job... but I can't find it...

Answer 1

set \l@chapter to l@section

\documentclass{book}
\usepackage{hyperref}

\begin{document}

\tableofcontents
\chapter{My first chapter}
\chapter{My second chapter}

\phantomsection
\addcontentsline{toc}{chapter}{Appendixes}
\appendix
\def\toclevel@chapter{1}\def\toclevel@section{2}
\addtocontents{toc}{\string\let\string\l@chapter\string
\l@section}
\chapter{My first appendix}
\chapter{My second appendix}

\end{document}

Answer 2

You can redefine \@chapter (as implemented in the document class used) to use \addcontentsline{toc}{section}{...} instead of \addcontentsline{toc}{chapter}{...}. Here's an example of such redefinition for book.cls:

\documentclass{book}
\usepackage{hyperref}

\begin{document}

\tableofcontents
\chapter{My first chapter}
\chapter{My second chapter}

\phantomsection
\addcontentsline{toc}{chapter}{Appendixes}
\appendix
\makeatletter
\def\@chapter[#1]#2{\ifnum \c@secnumdepth >\m@ne
                       \if@mainmatter
                         \refstepcounter{chapter}%
                         \typeout{\@chapapp\space\thechapter.}%
                         \addcontentsline{toc}{section}%
                                   {\protect\numberline{\thechapter}#1}%
                       \else
                         \addcontentsline{toc}{section}{#1}%
                       \fi
                    \else
                      \addcontentsline{toc}{section}{#1}%
                    \fi
                    \chaptermark{#1}%
                    \addtocontents{lof}{\protect\addvspace{10\p@}}%
                    \addtocontents{lot}{\protect\addvspace{10\p@}}%
                    \if@twocolumn
                      \@topnewpage[\@makechapterhead{#2}]%
                    \else
                      \@makechapterhead{#2}%
                      \@afterheading
                    \fi}
\makeatother

\chapter{My first appendix}
\chapter{My second appendix}

\end{document}

Here's the resulting ToC:

and the bookmarks pabel:

Answer 3

The following is a condensed version of Gonzalo's answer, using regexpatch. It patches the first appearance of {toc}{chapter} in \Hy@org@chapter with {toc}{section}, yielding the same result:

\documentclass{book}
\usepackage{hyperref}% http://ctan.org/pkg/hyperref
\usepackage{regexpatch}% http://ctan.org/pkg/regexpatch

\begin{document}

\tableofcontents
\chapter{My first chapter}
\chapter{My second chapter}

\phantomsection
\addcontentsline{toc}{chapter}{Appendixes}
\appendix
\makeatletter
\xpatchcmd{\Hy@org@chapter}{{toc}{chapter}}{{toc}{section}}{}{}%
\makeatother

\chapter{My first appendix}
\chapter{My second appendix}

\end{document}