Table of Contents and subappendices

Question

Using the report document class, how can I create a table of contents that looks like:

Chapter 1: Title

1.1  Title
1.2  Title

Appendices 
1.A
1.B

Chapter 2: Title

2.1  Title
2.2  Title

Appendices 
2.A
2.B

Answer 1

Below there's one possible solution; the code includes 1) A redefinition of \@chapter (as defined in report.cls) to include the word "Chapter" in the chapter entries of the ToC. 2) Two newly defined commands: \bappendix and \eappendix; the former starts a group, adds "Appendices" to the ToC and redefines \section (as defined in report.cls) to modify the section counter as requested; the latter simply ends the group:

\documentclass{report}

\newcounter{appendix}[chapter]

\makeatletter
\def\@chapter[#1]#2{\ifnum \c@secnumdepth >\m@ne
                         \refstepcounter{chapter}%
                         \typeout{\@chapapp\space\thechapter.}%
                         \addcontentsline{toc}{chapter}%
                                   {\@chapapp~\thechapter: #1}%
                    \else
                      \addcontentsline{toc}{chapter}{#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}

\newcommand\bappendix{%
  \addtocontents{toc}{\protect\addvspace{10pt}Appendices}
  \begingroup
  \renewcommand\section{\stepcounter{appendix}%
    \renewcommand\thesection{\thechapter.\Alph{appendix}}
    \@startsection {section}{1}{\z@}%
      {-3.5ex \@plus -1ex \@minus -.2ex}%
      {2.3ex \@plus.2ex}%
      {\normalfont\Large\bfseries}}}
\makeatother
\newcommand\eappendix{\endgroup}

\begin{document}
\tableofcontents

\chapter{First Chapter}
\section{Section One One}
\section{Section One Two}

\bappendix
\section{Appendix One A}
\section{Appendix One B}
\eappendix

\chapter{Second Chapter}
\section{Section Two One}
\section{Section Two Two}

\bappendix
\section{Appendix Two A}
\section{Appendix Two B}
\eappendix

\end{document}

Here's the same approach, but using the etoolbox package to simplify the code:

\documentclass{report}
\usepackage{etoolbox}

\newcounter{appendix}[chapter]

\makeatletter
\patchcmd{\@chapter}{\protect\numberline{\thechapter}#1}
{\@chapapp~\thechapter: #1}{}{}
\newcommand\bappendix{%
  \addtocontents{toc}{\protect\addvspace{10pt}Appendices}
  \begingroup
  \pretocmd{\section}{\stepcounter{appendix}%
    \renewcommand\thesection{\thechapter.\Alph{appendix}}}{}{}}
\makeatother
\newcommand\eappendix{\endgroup}

\begin{document}
\tableofcontents

\chapter{First Chapter}
\section{Section One One}
\section{Section One Two}

\bappendix
\section{Appendix One A}
\section{Appendix One B}
\eappendix

\chapter{Second Chapter}
\section{Section Two One}
\section{Section Two Two}

\bappendix
\section{Appendix Two A}
\section{Appendix Two B}
\eappendix

\end{document}

Here's now a much more simple solution using the subappendices environment from the appendix package; the subappendices environment was slightly modified (to add some vertical space before "Appendices" in the ToC) using the etoolbox package; this package was also used to add "Chapter" before the chapter entries in the ToC:

\documentclass{report}
\usepackage{appendix}
\usepackage{etoolbox}

\AtBeginEnvironment{subappendices}{%
  \addtocontents{toc}{\protect\addvspace{10pt}Appendices}
}
\makeatletter
\patchcmd{\@chapter}{\protect\numberline{\thechapter}#1}
{\@chapapp~\thechapter: #1}{}{}
\makeatother


\begin{document}
\tableofcontents

\chapter{First Chapter}
\section{Section One One}
\section{Section One Two}

\begin{subappendices}
\section{Appendix One A}
\section{Appendix One B}
\end{subappendices}

\chapter{Second Chapter}
\section{Section Two One}
\section{Section Two Two}

\begin{subappendices}
\section{Appendix Two A}
\section{Appendix Two B}
\end{subappendices}

\end{document}

Answer 2

A solution to your question is provided in the following MWE. The MWE also lets you specify when there's only one appendix in a chapter (having the subtitle read "Appendices" when there's only one appendix may look funny).

\documentclass{report}
\usepackage{tocloft,ifthen}
    \renewcommand\cftchappresnum{Chapter } 
    \cftsetindents{chapter}{0em}{6em}
    \cftsetindents{section}{0em}{2.25em}
    \cftsetindents{subsection}{2.25em}{3em}

\makeatletter
%% For source of "@seccntformat" command, see book "The LaTeX Companion"
\def\@seccntformat#1{\@ifundefined{#1@cntformat}%
   {\csname the#1\endcsname\ \ }%  default
   {\csname #1@cntformat\endcsname}}%    enable individual control
%% Individual control: '\section@cntformat'
\newcommand{\section@cntformat}{\thechapter.\thesection\ \ }

% Macros to redefine numbering of appendix sections
\newcommand{\appname}{} % dummy definition 
\newcommand{\appsecnumbering}[1][0]{%
    \ifthenelse{#1=1}{\renewcommand\appname{Appendix}}
                     {\renewcommand\appname{Appendices}}
    \setcounter{section}{0}
    \renewcommand\thesection{\thechapter.\Alph{section}}
    \renewcommand{\section@cntformat}{\appendixname~\thesection\ \ }
    \addtocontents{toc}{\medskip\protect{\mdseries\appname\par}}}
\newcommand\normalsecnumbering{%
    \renewcommand{\thesection}{\thechapter.\arabic{section}}
    \renewcommand{\section@cntformat}{\thesection\ \ }}
\let\origchapter\chapter
\renewcommand\chapter{\normalsecnumbering % first, reset numbering style
    \origchapter} % second, execute the original \chapter command
\makeatother

\begin{document}
\tableofcontents
\chapter{First Chapter}
\section{First Section Title} \label{sec:11}
\section{Second Section Title} \label{sec:12}
\appsecnumbering  
\section{Some additional stuff}       \label{sec:1a}
\section{Still more additional stuff} \label{sec:1b}
A couple of cross-references: 
  Section~\ref{sec:11} and Appendix~\ref{sec:1b}.

\chapter{Another Chapter}
\section{First Section Title}
\section{Second Section Title}
\appsecnumbering[1]  % specify "1" to request singular form of noun "Appendix"
\section{Some singular additional stuff}

\chapter{Yet Another Chapter}
\section{First Section Title}
\section{Second Section Title}
\appsecnumbering[7] % any number other than "1" generates plural form of noun
\section{Some additional stuff}
\section{Still more additional stuff}
\end{document}

Note the appearance of the first full page and, in particular, the cross-references to regular and appendix-area sections.

Finally, if you want the start of the section headers to line up vertically with the headers of the chapters, you should change the line

\cftsetindents{section}{0em}{2.25em}

to:

\cftsetindents{section}{0em}{6em}