Putting full paragraph path in page header

Question

I have a document of a deep structure, in sense Part, Chapter....Paragraph which are all used, I want to make full paragraph path to be displayed in the header of each page, something like:

Physics->Quantum Physics->Foundations->Harmonic Oscillator->Ladder Operators...

I managed to do that in MS Word some time ago, but how can that be done in LaTeX ? and please note that it may need more than one line to display it fully.

Answer 1

Here's a solution using the titleps package and its extramarks option:

\documentclass{book}
\usepackage[headheight=30pt]{geometry}
\usepackage[T1]{fontenc}
\usepackage{titlesec}
\usepackage[extramarks]{titleps}
\usepackage{lipsum}

\setcounter{secnumdepth}{4}

\settitlemarks*{chapter,section,subsection,subsubsection,paragraph}
\newpagestyle{main}[\small\sffamily]{
\sethead{%
  \parbox{\textwidth}{%
    \thechapter~\chaptertitle\space%
    \ifnum\value{section}>0 \guillemotright\ \else\fi%
    \thesection~\sectiontitle\space%
    \ifnum\value{subsection}>0 \guillemotright\ \else\fi%
    \thesubsection~\subsectiontitle\space%
    \ifnum\value{subsubsection}>0 \guillemotright\ \else\fi%
    \thesubsubsection~\subsubsectiontitle\space
    \ifnum\value{paragraph}>0 \guillemotright\ \else\fi%
    \theparagraph~\paragraphtitle%
  }
}{}{}}
\pagestyle{main}
\makeatletter
\let\ps@plain\ps@main
\makeatother

\newcommand\subsectionbreak{\clearpage}

\begin{document}

\chapter{Test Chapter One}
\section{Test Section One One}
\lipsum[1-5]
\subsection{Test Subsection One One One}
\lipsum[1-5]
\subsection{Test Subsection One One Two}
\lipsum[1-5]
\subsubsection{Test Subsection One One Two One}
\lipsum[1-5]
\paragraph{Test Paragraph One One Two One One}
\lipsum[1-5]

\end{document}

Some images taken from some of the pages to see the headers:

and

As a personal note, I don't think it's a good idea to use such longer headers.