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% SOFTWARE.
% 
% This package has been generated by PyTeX, available at
%    https://github.com/kesslermaximilian/PyTeX
% and built from source file 'refproof.pysty'.
% It is STRONGLY DISCOURAGED to edit this source file directly, since local
% changes will not be versioned by Git and overwritten by the next build. Always
% edit the source file and build the package again.
% 
% Build details:
%   PyTeX version: v1.2.0-3-g5e077e7 (commit 5e077e7)
%   Source code version: v2.4.3 (commit bc072ff)
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% This LaTeX package is free software and distributed under the MIT License. You
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\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{mkessler-refproof}[2022/01/09 - Automatic references to theorems in proofs. Claim counters within proofs]



\RequirePackage{xkeyval}

\newif\ifmkessler@refproof@english\mkessler@refproof@englishtrue
\DeclareOptionX{german}{\mkessler@refproof@englishfalse}
\DeclareOptionX{ngerman}{\mkessler@refproof@englishfalse}
\DeclareOptionX{english}{\mkessler@refproof@englishtrue}

\DeclareOptionX*{\PackageWarning{mkessler-refproof}{Unknown '\CurrentOption'}}
\ProcessOptionsX*\relax


\RequirePackage{amssymb}
\RequirePackage{amsthm}
\RequirePackage{etoolbox}
\RequirePackage{xparse}
\RequirePackage{refcount}
\RequirePackage{translator}

\usedictionary{translator-proof-dictionary}

%%Give claim an own counter and let it reset at each proof
%See also at:
%https://tex.stackexchange.com/questions/283502/reset-counter-at-beginning-of-proof
\newtheorem{claim}{\translate{Claim}}
\newtheorem*{claim*}{\translate{Claim}}
\AtBeginDocument{\def\claimautorefname{\translate{Claim}}}

\newif\ifmkessler@refproof@hyperref\mkessler@refproof@hyperreffalse
\AtBeginDocument{
    \@ifpackageloaded{hyperref}{
        \mkessler@refproof@hyperreftrue
        \let\mkessler@refproof@autoref\autoref
    }{
        \mkessler@refproof@hyperreftrue
        \let\mkessler@refproof@autoref\ref
    }
}

\let\mkessler@refproof@saved@proof\proof
\let\mkessler@refproof@saved@endproof\endproof

\NewDocumentEnvironment{refproof}{s m o}
{
    % Restore correct counter for claim
    \ifcsdef{themkessler@refproof@#2@save@claim}{
        \setcounter{claim}{\value{mkessler@refproof@#2@save@claim}}
        \def\mkessler@refproof@proofprefix{\IfBooleanTF{#1}{\translate{Continuation of proof* of}}{\translate{Continuation of proof of}}}
    }{
        \newcounter{mkessler@refproof@#2@save@claim}
        \setcounter{claim}{0}
        \def\mkessler@refproof@proofprefix{\IfBooleanTF{#1}{\translate{Proof* of}}{\translate{Proof of}}}
    }
    % Set up counter number printing as subindexed by numbering of the reference
    \let\mkessler@refproof@theoldclaim\theclaim
    \def\theclaim{\getrefnumber{#2}.\mkessler@refproof@theoldclaim}
    % Now, start the actual proof
    \mkessler@refproof@saved@proof[\mkessler@refproof@proofprefix\space\mkessler@refproof@autoref{#2}\IfValueT{#3}{\space(#3)}]
}
{
    \mkessler@refproof@saved@endproof % End proof
    % Save current claim counter for later restoration
    \setcounter{mkessler@refproof@#2@save@claim}{\value{claim}}
}

% Proof (with asterisk)
\AtBeginDocument{
    \RenewDocumentEnvironment{proof}{s o}
    {
        \mkessler@refproof@saved@proof[\IfBooleanTF{#1}{\translate{Proof*}}{\translate{Proof}}\IfValueT{#2}{\space(#2)}]
    }
    {
        \mkessler@refproof@saved@endproof
    }
}

\NewDocumentEnvironment{oldproof}{}{\mkessler@refproof@saved@proof}{\mkessler@refproof@saved@endproof}

%%subproof environment - essentially copied proof environment from amsthm and modified its name + symbol
\DeclareRobustCommand{\blackqed}{%
  \ifmmode \mathqed
  \else
    \leavevmode\unskip\penalty9999 \hbox{}\nobreak\hfill
    \quad\hbox{$\blacksquare$}%
  \fi
}

\newenvironment{subproof}[1][\ifmkessler@refproof@english Subproof\else Unterbeweis\fi]{\par
  \pushQED{\blackqed}%
  \normalfont \topsep6\p@\@plus6\p@\relax
  \trivlist
  \item[\hskip\labelsep
        \itshape
    #1\@addpunct{.}]\ignorespaces
}{%
  \popQED\endtrivlist\@endpefalse
}


%%%% This might be dropped, but for now is collected here

%%Solution (for exercises)
\newenvironment{solution}[1][]{\begin{proof}[\ifmkessler@refproof@english{}Solution\else{}Lösung\fi{}#1]}{\end{proof}}