Customized table of contents: Same indentation for every line of multi-line titles

Question

In a previous question I asked about customizing my table of contents. For now, I have decided to fill the table of contents simply like this for each article:

\addtocontents{toc}{\textit{\Author}\\}
\addtocontents{toc}{\hspace{1cm} \Title \dotfill \pageref{firstpage}–\pageref{lastpage}\\}

But I still have no clue how to indent the line(s) containing the title (if the title extends over more than one line, all lines should be indented by the same amount):

=== Author's Name ===

    === Title: 1st Line ===
    === Title: 2nd Line ===

Is there a simple solution?

Answer 1

Here is an example inspired of a few internal memoir macros, should work with any class:

\documentclass[a4paper]{memoir}
\newcommand\Title{This is a very long and complicated title that spans
several lines going on and on}
\newcommand\AuthorInToc[1]{\addtocontents{toc}{\protect\formatauthor{#1}}}
\newcommand\ArticleInToc[2]{\addtocontents{toc}{%
   \protect\formatarticle{#1}{#2}}}
\newcommand\formatauthor[1]{\noindent \textit{#1}\par}
\newcommand\formatarticle[2]{%
  \begingroup%
  \nopagebreak%
  \noindent%
  \setlength\leftskip{1cm}%
  \setlength\rightskip{4em}%
  \setlength\parfillskip{-4em}%
  \textit{Title:}~{#1}\dotfill\hbox to 4em{\hfil #2}\par%
  \endgroup%
}
\begin{document}

\tableofcontents*

\chapter{test}
\AuthorInToc{An Author}
\ArticleInToc{\Title}{1--5}
\end{document}

The idea is to remember that each entry in the TOC is actually a paragraph by it self, so treat it like that.