Intermediate page numbering

Question

I want to use both regular page numbering (as in 1, 2, 3, etc) and n-m page numbering (1-1, 1-2, 2-1, 2-2, etc) in a document I'm preparing.

This far I've been playing around with custom counters but the obvious answer, using \addtocounter to subtract the page where the current chapter started from \thepage defeats that purpose because I still want regular page numbers.

I can't really post an MWE because it's something I don't really know how to do. On the "pseudo-MWE" below \nmpage is a hypothetic command that outputs the page number in the format <chapter>-<page_of_chapter>, so the 5th page of chapter 2 would be 2-5.

Any ideas on how I could achieve that?

\documentclass[12pt,a4paper,openany]{book}
\usepackage{fancyhdr}  
  \pagestyle{fancy}  
  \renewcommand{\chaptermark}[1]{%  
    \markboth{#1}{}}  
  \renewcommand{\sectionmark}[1]{%  
    \markright{\thesection #1}}  
  \fancyhf{}  
  \fancyhead[LE,RO]{\thepage}%   
  \fancyhead[LO]{\rightmark}%  
  \fancyhead[RE]{\leftmark}%  
  \fancyfoot[LE,RO]{\nmpage}%  

\begin{document}

\chapter{Chapter 1}

Onononononon

\chapter{Chapter 2}

Yada yada yada.

\end{document}

Answer 1

The main page number is \thepage with regular (arabic) numbering. This is also used for page references. Thus we do not need to do anything here.

Additionally the footer should show a page number of the form \thechapter-<arabic page relative to the chapter>. All we need is the page number of the chapter start. Since \chaptermark is already redefined, the definition for \StartChapterPage is put there. A chapter starts a new page, thus we can use \value{page} without resorting to the referencing system. Second advantage of \chaptermark is that it is not called for unnumbered chapters. In order to skip the first pages, \nmpage is defined empty and \printnmpage is defined to do the real work. At the first numbered chapter \nmpage gets the meaning of \printnmpage and the composite page number is shown:

The following definitions are added to the MWE of the question:

\newcommand*{\StartChapterPage}{1}
\newcommand*{\nmpage}{}
\newcommand*{\printnmpage}{%
  \thechapter-\the\numexpr\value{page}-\StartChapterPage+1\relax
}

And the definition for \chaptermark changes as follows:

\renewcommand{\chaptermark}[1]{%
  \xdef\StartChapterPage{\the\value{page}}%
  \global\let\nmpage\printnmpage
  \markboth{#1}{}}

Answer 2

That can be achieved by creating a new counter that is reset with each chapter, then incrementing it everytime it is used in the headings:

\documentclass{book}

\newcounter{nmpage}[chapter]

\usepackage{fancyhdr}
\pagestyle{fancy}
\lfoot{}
\cfoot{\thechapter--\addtocounter{nmpage}{1}\thenmpage}
\usepackage{lipsum}
\begin{document}
\chapter{The beginning}
\thispagestyle{fancy}

\lipsum[1-6]


\chapter{More Material}
\thispagestyle{fancy}

\lipsum[7-8]
\end{document}

Maybe looking at the memoir class might be a better place. I was using the book class.