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%
% pxatbegshi.sty
% written by Hironobu Yamashita (@aminophen)
%
% This package is part of the platex-tools bundle.
% https://github.com/aminophen/platex-tools
%
% Largely based on bxpapersize.sty by T. Yato.
% Previous versions were largely based on H. Kitagawa's
% code on GitHub:texjporg/tex-jp-build#21.
%
%% package declaration
\NeedsTeXFormat{pLaTeX2e}
\ProvidesPackage{pxatbegshi}
[2018/09/21 v0.4 Patch to atbegshi for (u)pLaTeX]
%% preparations
\def\pxabgs@pkgname{pxatbegshi}
\def\pxabgs@warn{\PackageWarningNoLine\pxabgs@pkgname}
%% load it
\RequirePackage{atbegshi}
%% internal macros are locally effective
\begingroup
%--------------------------------------- helpers
%% unique tokens
\def\pxabgs@mark{\pxabgs@mark@}
\def\pxabgs@fin{\pxabgs@fin@}
%% \pxabgs@patch@cmd\CMD{<orig>}{<new>}
\@onlypreamble\pxabgs@patch@cmd
\def\pxabgs@patch@cmd#1#2#3{%
\def\pxabgs@next##1#2##2\pxabgs@mark##3\pxabgs@fin{%
\ifx\pxabgs@mark##3\pxabgs@mark
\let\pxabgs@fragment\relax
\else
\def\pxabgs@fragment{##2}%
\def#1{##1#3##2}%
\fi}%
\expandafter\pxabgs@next#1\pxabgs@mark#2\pxabgs@mark\pxabgs@fin}
%---------------------------------------
%% patch \AtBegShi@Output
% concept: execute all hooks in temporary yoko direction,
% by prepending \yoko and switching back to the original
%
% prepare
\let\pxabgs@AtBegShi@Output\AtBegShi@Output
% first, check hooks inserted by bxpapersize.sty
% -> if detected, nothing to do
\pxabgs@patch@cmd\pxabgs@AtBegShi@Output
{\bxpr@ABS@prehook}{\bxpr@ABS@prehook}%
\ifx\pxabgs@fragment\relax\else % found
\pxabgs@patch@cmd\pxabgs@AtBegShi@Output
{\bxpr@ABS@posthook}{\bxpr@ABS@posthook}%
\ifx\pxabgs@fragment\relax\else % found
\let\pxabgs@AtBegShi@Output\relax
\fi
\fi
% -> if not detected, prepend/append hooks
\ifx\pxabgs@AtBegShi@Output\relax\else
\expandafter\def\expandafter\pxabgs@AtBegShi@Output\expandafter{%
\expandafter\pxabgs@ABS@prehook
\pxabgs@AtBegShi@Output
\pxabgs@ABS@posthook
}
% adjust for atbegshi.sty on non-e-TeX ...
% (for e-TeX, this patch should fail but does nothing!)
\pxabgs@patch@cmd\pxabgs@AtBegShi@Output
{\pxabgs@ABS@prehook\egroup\endgroup}
{\egroup\endgroup\pxabgs@ABS@prehook}%
% commit the change
\global\let\AtBegShi@Output\pxabgs@AtBegShi@Output
\fi
%
%% done
%--------------------------------------- done
\endgroup
%% internal macros are no longer effective
%% hooks
\let\pxabgs@restore@dir\relax
\def\pxabgs@ABS@prehook{%
\iftdir
\yoko
\let\pxabgs@restore@dir\tate
\else
\let\pxabgs@restore@dir\relax
\fi}
\def\pxabgs@ABS@posthook{\pxabgs@restore@dir}
\endinput
%% EOF
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