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%
% plautopatch.sty
% written by Hironobu Yamashita (@aminophen)
%
% This package is part of the plautopatch bundle.
% https://github.com/aminophen/plautopatch
%

\NeedsTeXFormat{LaTeX2e}% not pLaTeX2e on purpose!
\ProvidesPackage{plautopatch}
    [2020/05/25 v0.9g Automated patches for pLaTeX/upLaTeX]

\ifx\pfmtname\@undefined
  \PackageWarningNoLine{plautopatch}{%
    This package is meant for pLaTeX/upLaTeX,\MessageBreak
    you will not need it.}
  \expandafter\endinput
\fi

\NeedsTeXFormat{pLaTeX2e}% just in case ...
\def\platpc@pkgname{plautopatch}
\def\platpc@err{\PackageError\platpc@pkgname}
\def\platpc@warn{\PackageWarningNoLine\platpc@pkgname}
\def\platpc@info{\PackageInfo\platpc@pkgname}

\RequirePackage{filehook}

% low-level helpers

%% \platpc@ifreq@add{<package>}
% = if not loaded yet, \RequirePackage{<package>}
%   and add to list.
\def\platpc@ifreq@add#1{%
  \@ifpackageloaded{#1}{}{%
    \RequirePackage{#1}\platpc@addtolist{#1}%
  }%
}

%% \platpc@addtolist{<package>}
% = add <package> to list named \platpc@list.
\def\platpc@addtolist#1{\xdef\platpc@list{\platpc@list, #1}}
\def\platpc@list{}% initialize

%% \platpc@ifnotdisabled{<package>}{<code>}
% = execute <code> if <package> is not disabled.
\def\platpc@ifnotdisabled#1{%
  \expandafter\ifx\csname platpc@disable@#1\endcsname\relax
    \expandafter\@firstofone
  \fi
}

%% \platpc@err@toolate{<package>}
% = content of the "too-late" error.
\def\platpc@err@toolate#1{%
  \platpc@err{Package `#1' already loaded!\MessageBreak
    Use \string\RequirePackage{\platpc@pkgname} earlier}\@ehc
}

% high-level helpers

%% \platpc@patch@after{<orig>}{<patch>}
% = Load <patch> after <orig>.
\def\platpc@patch@after#1#2{%
  \expandafter\def\csname platpc@end@#1\endcsname{%
    \platpc@ifnotdisabled{#1}{\platpc@ifreq@add{#2}}%
  }%
  \@ifpackageloaded{#1}{%
    \csname platpc@end@#1\endcsname
  }{%
    \AtEndOfPackageFile{#1}{\csname platpc@end@#1\endcsname}%
  }%
}
\@onlypreamble\platpc@patch@after

%% \platpc@patch@after@both{<orig 1>}{<orig 2>}{<patch>}
% = Load <patch> after both <orig 1> & <orig 2>.
\def\platpc@patch@after@both#1#2#3{%
  \expandafter\def\csname platpc@end@#1+#2\endcsname{%
    \platpc@ifnotdisabled{#1}{\platpc@ifnotdisabled{#2}{%
      \platpc@ifreq@add{#3}%
    }}%
  }%
  \@ifpackageloaded{#1}{%
    \@ifpackageloaded{#2}{%
      \csname platpc@end@#1+#2\endcsname
    }{%
      \AtEndOfPackageFile{#2}{\csname platpc@end@#1+#2\endcsname}%
    }%
  }{%
    \@ifpackageloaded{#2}{%
      \AtEndOfPackageFile{#1}{\csname platpc@end@#1+#2\endcsname}%
    }{%
      \AtEndOfPackageFile{#1}{%
        \@ifpackageloaded{#2}{\csname platpc@end@#1+#2\endcsname}{}%
      }%
      \AtEndOfPackageFile{#2}{%
        \@ifpackageloaded{#1}{\csname platpc@end@#1+#2\endcsname}{}%
      }%
    }%
  }%
}
\@onlypreamble\platpc@patch@after@both

%% \platpc@patch@before{<orig>}{<patch>}
% = Load <patch> before <orig>.
%   used when both conditions are met:
%   - <patch> must be loaded *before* <orig>
%   - <patch> contains \RequirePackage{<orig>}
\def\platpc@patch@before#1#2{%
  \expandafter\def\csname platpc@begin@#1\endcsname{%
    \platpc@ifnotdisabled{#1}{%
      % if <patch> is already loaded, nothing to do
      \@ifpackageloaded{#2}{}{% else
        % the code (*!) should be used only once,
        % remove it immediately when this macro is executed
        \expandafter\let\csname platpc@begin@#1\endcsname\relax
        % pretend as if <orig> not loaded
        \expandafter\let\csname ver@#1.sty\endcsname\relax
        % load the <patch> package
        \RequirePackage{#2}\platpc@addtolist{#2}%
        % avoid loading <orig> twice by discarding "\@@input <orig>" (*!)
        \let\platpc@filehook@@atbegin\filehook@@atbegin
        \def\filehook@@atbegin\@@input####1\filehook@atend{%
          \let\filehook@@atbegin\platpc@filehook@@atbegin
          % avoid infinite loop even when \AtEndOfPackageFile used
          \expandafter\let\csname filehook@atend@#1.sty\endcsname\relax
          \filehook@@atbegin
          \filehook@atend}%
        % all done
      }%
    }%
  }%
  % if <orig> is already loaded at this point, too late!
  \@ifpackageloaded{#1}{%
    \platpc@err@toolate{#1}%
  }{% else
    \AtBeginOfPackageFile{#1}{\csname platpc@begin@#1\endcsname}%
  }%
}
\@onlypreamble\platpc@patch@before

% interface for users who want don't patches

%% \plautopatchdisable{<orig 1>,<orig 2>,...}
% = Disable patches triggered by <orig 1>, <orig 2>, ...
\newcommand{\plautopatchdisable}[1]{%
  \edef\@tempa{\zap@space#1 \@empty}%
  \@for\@tempa:=\@tempa\do{%
    \expandafter\let\csname platpc@disable@\@tempa\endcsname\@empty
  }%
}
\@onlypreamble\plautopatchdisable

% show list of loaded patches

\AtEndDocument{\platpc@showlist}
\def\platpc@showlist{%
  \ifx\platpc@list\@empty
    \platpc@info{No additional packages loaded}
  \else
    % the first token of \platpc@list should be ','
    \typeout{%
      ***** List of packages loaded by `\platpc@pkgname': *****^^J%
      \expandafter\@gobble\platpc@list.^^J%
      *****************************************************}%
  \fi
}

% register patches

\platpc@patch@after{doc}{pldocverb}% (maintained here!)
\ifx\enablecjktoken\@undefined
  \platpc@patch@after{tracefnt}{ptrace}% platex
\else
  \platpc@patch@after{tracefnt}{uptrace}% uplatex
\fi
\platpc@patch@after{fltrace}{pfltrace}% platex
\platpc@patch@after{array}{plarray}% platex-tools
\platpc@patch@after@both{array}{plext}{plextarray}% platex-tools
\platpc@patch@after@both{delarray}{plext}{plextdelarray}% platex-tools
\platpc@patch@after@both{colortbl}{plext}{plextcolortbl}% (maintained here!)
\platpc@patch@after{arydshln}{plarydshln}% (maintained here!)
\platpc@patch@after@both{arydshln}{plext}{plextarydshln}% (maintained here!)
\platpc@patch@after{siunitx}{plsiunitx}% (maintained here!)
\platpc@patch@after{collcell}{plcollcell}% (maintained here!)
% --- in most cases, pxeverysel can be safely loaded even after everysel
% --- but it can fail when \AtBeginDocument{everysel} is involved
\platpc@patch@before{everysel}{pxeverysel}% platex-tools
\platpc@patch@after{everyshi}{pxeveryshi}% platex-tools
\platpc@patch@after{atbegshi}{pxatbegshi}% platex-tools
\platpc@patch@before{ftnright}{pxftnright}% platex-tools
\platpc@patch@after{multicol}{pxmulticol}% platex-tools
\platpc@patch@after{xspace}{pxxspace}% platex-tools
\platpc@patch@after{textpos}{pxtextpos}% (maintained here!)
\platpc@patch@after{pdfpages}{pxpdfpages}% (maintained here!)
\platpc@patch@before{stfloats}{pxstfloats}% pxsttools -- (!!)
% --- in most cases, pxjahyper works without explicit options
% --- however, in case a user specifies some, delay it
% --- [TODO] if \AtBeginDocument{\usepackage{hyperref}} appears,
% ----       writing to \jobname.out (= 'jacommentline' feature)
% ----       does not work because it's too late.
\AtBeginDocument{\platpc@patch@after{hyperref}{pxjahyper}}

% for TikZ/PGF
\platpc@patch@after{pgfrcs}{pxpgfrcs}% (maintained here!)
% --- pxpgfmark is useful on e-(u)pTeX + dvipdfmx
% --- but does no harm for other conditions
% --- [Update] pgf 2019-01-05 v3.1 (with \gdef\pgfversion{3.1})
% ----         already supports inter-picture connections
% ----         so pxpgfmark is no longer required
\platpc@patch@after{pgfcore}{pxpgfmark}% by Takayuki YATO (ZR)

% special case, mainly for problematic packages
% --- mdwtab forbids loading array
% --- so plarray should also be forbidden
\AtEndOfPackageFile{mdwtab}{\@namedef{ver@plarray.sty}{}}

\endinput