Renumbering chapter after part, include part number as suffix in cross-reference to chapter number

Question

i want to do the same like in this answered question:

Renumbering chapter after part, correct ref, ToC and chap header aspect

which gives the following code to add:

\usepackage{chngcntr}
\counterwithin{chapter}{part}

\makeatletter
\renewcommand{\thechapter}{\@arabic\c@chapter}
\renewcommand{\p@chapter}{\thepart.}
\makeatother

with one difference:

Is it possible to add the part-"part" after the chapter-"part" inside the cross-reference?

What I mean is, is it possible to set a suffix?

The result should for:

Comparison between \autoref{part_1_chapter_1} and \autoref{part_2_chapter_1}

should look somehow like:

Comparison between Chapter 1/Part I and Chapter 1/Part II

UPDATE:

I want to be able to ref to any command like chapter, section, subsection, subsubsection and have the normal output of autoref and after this there should be added the part from this ref.

For example:

Chapter 1/Part 1 or Section 2/Part 1

Answer 1

Here's a an approach (similar to Mico's answer) with zref and storing the part information with \zlabel instead of \label.

The solution stores anchors and the type of the counter being referenced. It retrieves the counter name, changes the name to have the first letter being upper case and types this new name together with the part info.

If the part counter is used or the reference is not made with zlabel, the \pref command falls back to \Cref.

The precise format of the output can be configured within \partreferenceformat.

\documentclass{report}
\usepackage{etoolbox}
\usepackage[user,counter,hyperref]{zref}
\usepackage[colorlinks]{hyperref}
\usepackage[nameinlink]{cleveref}

\usepackage{xparse}

\ExplSyntaxOn

\cs_generate_variant:Nn \str_head:n {x,o,V}
\cs_generate_variant:Nn \str_tail:n {x,o,V}
\cs_generate_variant:Nn \str_uppercase:n {x,o,V}
\cs_generate_variant:Nn \str_set:Nn {Nx}

\newcommand{\FirstUpcase}[1]{%
  \str_set:Nx \l_tmpa_str {#1}%
  \str_uppercase:x {\str_head:N \l_tmpa_str}\str_tail:V {\l_tmpa_str}%
}
\ExplSyntaxOff


\makeatletter


\newif\if@hyperrefloaded
\AtEndPreamble{%
  \@ifpackageloaded{hyperref}{%
    \global\@hyperrefloadedtrue
  }{
    \global\@hyperrefloadedfalse
  }
}


\zref@newprop{partinfo}{\thepart}
\zref@addprop{main}{partinfo}

\newcommand{\partreferenceformat}[1]{%
  \FirstUpcase{\zref@extract{#1}{counter}}\ \zref@extract{#1}{default}/Part \zref@extract{#1}{partinfo}%
}

\newcommand{\pref}[1]{%
  \begingroup
  \edef\temp@@a{part}%
  \zref@ifrefundefined{#1}{%
    \Cref{#1}%
  }{%
    % Checking whether we have a reference to the part counter -> use the usual \Cref for this
    \edef\temp@@b{\zref@extract{#1}{counter}}%
    \ifx\temp@@b\temp@@a
    \Cref{#1}%
    \else
    \if@hyperrefloaded
    \hyperlink{\zref@extract{#1}{anchor}}{\partreferenceformat{#1}}%
    \else
    \partreferenceformat{#1}%
    \fi
    \fi
  }%
  \endgroup
}

\makeatother

\usepackage{blindtext}

\begin{document}

\tableofcontents


\part{AAA}    
\chapter{Uno} \zlabel{chap:uno}

\section{Foo section} \zlabel{sec:foo}
\part{BBB}    \label{part:bbb}
\chapter{Due} \zlabel{chap:due}
\blindtext[5]

\clearpage


A comparison between \pref{chap:uno} and \pref{chap:due} or \pref{sec:foo} \dots

On the other hand \pref{part:bbb} produces something different!

\end{document}

Old solution

The command \chappartref retrieves the label and checks whether it is a label belonging to the chapter counter, otherwise it falls back to \ref.

\documentclass{report}
\usepackage[user,counter,hyperref]{zref}
\usepackage[colorlinks]{hyperref}


\makeatletter
\zref@newprop{partinfo}{\thepart}
\zref@addprop{main}{partinfo}

\newcommand{\chappartref}[1]{%
  \begingroup
  \edef\temp@@a{chapter}%
  \zref@ifrefundefined{#1}{%
    \ref{#1}%
  }{%
    \edef\temp@@b{\zref@extract{#1}{counter}}%
    \ifx\temp@@b\temp@@a
    \hyperlink{\zref@extract{#1}{anchor}}{Chapter \zref@extract{#1}{default}/Part \zref@extract{#1}{partinfo}}%%
    \else
    \ref{#1}%
    \fi
  }%
  \endgroup
}

\makeatother


\begin{document}

\part{AAA}    
\chapter{Uno} \zlabel{chap:uno}
\part{BBB}    \label{part:bbb}
\chapter{Due} \zlabel{chap:due}

\clearpage

A comparison between \chappartref{chap:uno} and \chappartref{chap:due} \dots

On the other hand \chappartref{part:bbb} produces something different!

\end{document}

Next update With German translations for some counters

\documentclass{report}

\usepackage{etoolbox}
\usepackage{amsmath}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[ngerman]{babel}
\usepackage{letltxmacro}


\usepackage[user,counter,hyperref]{zref}
\usepackage[colorlinks]{hyperref}
\usepackage[nameinlink,ngerman]{cleveref}

\usepackage{xparse}


\ExplSyntaxOn

\prop_new:N \g_zaehlernamen_deutsch_prop

\cs_generate_variant:Nn \str_head:n {x,o,V}
\cs_generate_variant:Nn \str_tail:n {x,o,V}
\cs_generate_variant:Nn \str_uppercase:n {x,o,V}
\cs_generate_variant:Nn \str_set:Nn {Nx}
\cs_generate_variant:Nn \prop_item:Nn {Nx}
\cs_generate_variant:Nn \prop_gput:Nnn {Nxx}

\newcommand{\FirstUpcase}[1]{%
  \str_set:Nx \l_tmpa_str {#1}%
  \str_uppercase:x {\str_head:N \l_tmpa_str}\str_tail:V {\l_tmpa_str}%
}

\NewDocumentCommand{\StoreCounterNameMap}{+m}{%
  \seq_set_from_clist:Nn \l_tmpa_seq {#1}
  \seq_map_inline:Nn \l_tmpa_seq {
    \seq_set_split:Nnn \l_tmpb_seq {/} {##1}
    \prop_gput:Nxx \g_zaehlernamen_deutsch_prop { \seq_item:Nn \l_tmpb_seq {1}} { \seq_item:Nn \l_tmpb_seq {2}}
  }
}

\cs_new:Npn \GetNameFromCounter #1{%
  \prop_item:Nx \g_zaehlernamen_deutsch_prop {#1}
}

\ExplSyntaxOff


\makeatletter


\newif\if@hyperrefloaded
\AtEndPreamble{%
  \@ifpackageloaded{hyperref}{%
    \global\@hyperrefloadedtrue
  }{
    \global\@hyperrefloadedfalse
  }
}


\zref@newprop{partinfo}{\thepart}
\zref@newprop{equationinfo}{\theequation}
\zref@addprops{main}{partinfo,equationinfo}

\newcommand{\partreferenceformat}[1]{%
  \GetNameFromCounter{\zref@extract{#1}{counter}}\ \zref@extract{#1}{default}/\GetNameFromCounter{part} \zref@extract{#1}{partinfo}%
}

\newcommand{\pref}[1]{%
  \begingroup
  \edef\temp@@a{part}%
  \zref@ifrefundefined{#1}{%
    \Cref{#1}%
  }{%
    \edef\temp@@b{\zref@extract{#1}{counter}}%
    \ifx\temp@@b\temp@@a
    \Cref{#1}%
    \else
    \if@hyperrefloaded
    \hyperlink{\zref@extract{#1}{anchor}}{\partreferenceformat{#1}}%
    \else
    \partreferenceformat{#1}%
    \fi
    \fi
  }%
  \endgroup
}

%Special command for zequationlabel
\newcommand{\zequationlabel}[1]{%
  \label{#1}%
  \IfRefUndefinedExpandable{#1}{}{%
    \zref@setcurrent{anchor}{\getrefbykeydefault{#1}{anchor}\relax}%
  }%
  \zref@setcurrent{counter}{equation}%
  \zref@setcurrent{default}{\getrefnumber{#1}}%
  \zlabel{#1}%
}

\makeatother

\usepackage{blindtext}

\StoreCounterNameMap{
  part/Teil, 
  chapter/Kapitel, 
  section/Abschnitt,
  subsection/Unterabschnitt,
  subsubsection/Unterunterabschnitt, % ;-)
  paragraph/Paragraf,
  subparagraph/Kleiner Paragraf,
  figure/Abbildung,
  table/Tabelle,
  equation/Gleichung
}


\begin{document}
\tableofcontents

\part{AAA}    
\chapter{Uno} \zlabel{chap:uno}

\begin{align}
  E&=mc^{2} \zequationlabel{Einstein} \\%
  E^{2} &= m^{2} c^{4} + p^{2} c^{2} \zequationlabel{Einstein2}
\end{align}

\section{Foo section} \zlabel{sec:foo}
\part{BBB} \label{part:bbb}
\chapter{Due} \zlabel{chap:due}



\blindtext[5]

\begin{align}
  E&=mc^{2} \zequationlabel{Einstein3}%
\end{align}


\getrefbykeydefault{Einstein}{anchor}


\clearpage

Hier ist ein kleiner Vergleich zwischen \pref{chap:uno} und \pref{chap:due}, oder zum Beispiel \pref{sec:foo}, bzw. \pref{Einstein} bzw. \pref{Einstein2}\dots

Wird nicht \verb!\zlabel! verwendet, dann liefert \verb!\pref! ganz einfach den cleveref-Namen, z.B: \pref{part:bbb}.

Und weil es so schön ist: \pref{Einstein3}

\end{document}

Answer 2

Something like this?

Note that the \mychref macro takes two arguments: here, they're labels of parts and chapters, but they could be anything, really.

\documentclass{report} % use a document class that provides "\chapter" macro
\usepackage[colorlinks]{hyperref}
\usepackage[nameinlink]{cleveref}
% Custom macro for composite cross-references
% Input ordering: part label, chapter label
% Output ordering: "Chapter" <number> "slash" "Part" <number>
\newcommand\mychref[2]{\Cref{#2}/\Cref{#1}} 

\begin{document}

\part{AAA}    \label{part:aaa}
\chapter{Uno} \label{chap:uno}
\part{BBB}    \label{part:bbb}
\chapter{Due} \label{chap:due}

\clearpage

A comparison between \mychref{part:aaa}{chap:uno} and \mychref{part:bbb}{chap:due} \dots

\end{document}