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%
% pxatbegshi.sty
% based on H. Kitagawa's code on GitHub:texjporg/tex-jp-build#21
% and modified by Hironobu Yamashita
%
% This package is distributed as part of the platex-tools bundle
% maintained by Hironobu Yamashita
% https://github.com/aminophen/platex-tools
%
%% package declaration
\NeedsTeXFormat{pLaTeX2e}
\ProvidesPackage{pxatbegshi}
[2017/11/04 v0.2 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}
%---------------------------------------
% concept: execute all hooks inside yoko direction \vbox
% prepare
\let\pxabgs@AtBegShi@Output\AtBegShi@Output
% try first patch
\pxabgs@patch@cmd\pxabgs@AtBegShi@Output
{\let\AtBegShi@OrgProtect\protect}%
{\setbox8\vbox\bgroup\yoko\let\AtBegShi@OrgProtect\protect}
\ifx\pxabgs@fragment\relax % failure
\let\pxabgs@AtBegShi@Output\relax
\else % success, try second patch
\pxabgs@patch@cmd\pxabgs@AtBegShi@Output
{\AtBeginShipoutOriginalShipout\box\AtBeginShipoutBox}%
{\AtBeginShipoutOriginalShipout\box\AtBeginShipoutBox\egroup}
\ifx\pxabgs@fragment\relax % failure
\let\pxabgs@AtBegShi@Output\relax
\fi
\fi
% commit the change only when successful
\ifx\pxabgs@AtBegShi@Output\relax
\pxabgs@warn{Failed in patching \string\AtBegShi@Output}
\else
\global\let\AtBegShi@Output\pxabgs@AtBegShi@Output
\fi
\endgroup
%% internal macros are no longer effective
%--------------------------------------- done
\endinput
%% EOF
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