Refer to "[Section], [Paragraph]" when [Paragraph] is custom formatted

Question

I would like to have sections and single number paragraphs, like

2.3.1 Frobnication
    §1 Foo bar frob

which I achieved. But when when I refer to the paragraph ...

\myref{Paragraph's Label}

... but all I could achieve looks like:

See §1 (p. 1).

But I would like to have it like so:

See Section 2.3.1, §1 (p.1)

At the moment, this is my ref-command and my renewed \theparagraph:

\setcounter{secnumdepth}{5}
\renewcommand\theparagraph{§\arabic{paragraph}}
\newcommand{\pararef}[1]{\ref{#1} (p. \pageref{#1})}

My current workaround is to have two parameters to \pararef, but it feels unclean and clumsy.

Answer 1

You can define a "reference prefix": if foo is a counter, then its value when a label refers to it is printed as

\p@foo\thefoo

where \p@foo is by default empty. So

\documentclass{article}
\setcounter{secnumdepth}{5}
\renewcommand\theparagraph{\S~\arabic{paragraph}}
\newcommand{\pararef}[1]{\ref{#1} (p.~\pageref{#1})}

\makeatletter
\renewcommand{\p@paragraph}{\thesubsubsection, }
\makeatother

\begin{document}
\section{A}
\subsection{B}
\subsubsection{C}
\paragraph{D}\label{x}

This is the reference: \pararef{x}
\end{document}

If you don't always use \paragraph subordinate to subsubsections, then you can say

\makeatletter
\renewcommand{\p@paragraph}{%
  \ifnum\value{subsection}=\z@
    \thesection
  \else
    \ifnum\value{subsubsection}=\z@
      \thesubsection
    \else
      \thesubsubsection
    \fi
  \fi,\space
}
\makeatother

This assumes that \paragraph is at least subordinate to a section. This is a test document

\documentclass{article}
\setcounter{secnumdepth}{5}
\renewcommand\theparagraph{\S~\arabic{paragraph}}
\newcommand{\pararef}[1]{\ref{#1} (p. \pageref{#1})}

\makeatletter
\renewcommand{\p@paragraph}{%
  \ifnum\value{subsection}=\z@
    \thesection
  \else
    \ifnum\value{subsubsection}=\z@
      \thesubsection
    \else
      \thesubsubsection
    \fi
  \fi,\space
}
\makeatother

\begin{document}
\section{A}
\subsection{B}
\subsubsection{C}
\paragraph{D}\label{x}

This is the reference: \pararef{x}

\section{E}
\paragraph{F}\label{y}

This is the reference: \pararef{y}

\section{G}
\subsection{H}
\paragraph{I}\label{z}

This is the reference: \pararef{z}
\end{document}

I've always found this kind of cross references heavy and not friendly to the reader.

Answer 2

I'll leave my original answer below so the comments make sense but a better solution is to use the built in prefixing mechanism for cross references (that by default isn't used for sections but is for nested lists). The command \p@paragraph is used at the start of any cross reference text (but mot when the counter is directly printed in the heading)

\documentclass{article}
\makeatletter


\setcounter{secnumdepth}{5}
\renewcommand\theparagraph{\P\arabic{paragraph}}
\newcommand{\pararef}[1]{\ref{#1} (p. \pageref{#1})}

\def\p@paragraph{Section \@currentlabel\ }

\makeatother

\begin{document}


\section{jhg}
\paragraph{jj}\label{jj}
\subsection{ljhg}
\subsubsection{lkb ljhg}
\paragraph{jjj}\label{foo}

jhgg

\section{ojh}
 See \pararef{foo} and \pararef{jj}

\end{document}

Original answer:

One way is to put the long form into \theparagraph but not print it all when making the heading:

\documentclass{article}

\setcounter{secnumdepth}{5}
\renewcommand\theparagraph{\protect\myswitch{Section \thesubsubsection\ }\P\arabic{paragraph}}
\newcommand{\pararef}[1]{\ref{#1} (p. \pageref{#1})}
\makeatletter
\renewcommand\paragraph{\@startsection{paragraph}{4}{\z@}%
                                    {3.25ex \@plus1ex \@minus.2ex}%
                                    {-1em}%
                                    {\let\myswitch\@gobble\normalfont\normalsize\bfseries}}


\def\myswitch#1{#1}
\makeatother

\begin{document}


\section{jhg}
\subsection{ljhg}
\subsubsection{lkb ljhg}
\paragraph{jjj}\label{foo}

jhgg

\section{ojh}
 See \pararef{foo}

\end{document}