% Babelbidi: Bidi extensions for Babel.
%
% Copyright (C) 2026 Amer Amikhteh
%
% This file is part of the Babelbidi package.
%
% This work is free software: you may redistribute it and/or modify
% it under the terms of the LaTeX Project Public License as published
% by the LaTeX Project, either version 1.3c of the License, or
% (at your option) any later version.
%
% This work is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
%
% The full license text is available at:
% https://www.latex-project.org/lppl/
%
% This work is "maintained" by Amer Amikhteh.
%
% The current maintainer of this work is Amer Amikhteh.

\ProvidesFile{babelbidi-luatex.def}
[2026/10/09 v0.1.0 LuaTeX support for Babelbidi]

\makeatletter


% ------------------------------------------
% Footnote Hook
% ------------------------------------------

\let\bbd@fn@dir\relax
\newtoks\bbd@fn@pending@toks
\newif\ifbbd@fn@pending

\def\bbd@fn@setdir{%
    \if@RTL
        \global\let\bbd@fn@dir\relax
    \else
        \global\let\bbd@fn@dir\setparLTR
    \fi
}%

\@ifundefined{bbl@footnote}{}{%
    \let\bbd@orig@bbl@footnote\bbl@footnote
    \def\bbl@footnote#1#2#3{%
        \bbd@fn@setdir
        \bbd@orig@bbl@footnote{#1}{#2}{#3}}%
}%

\let\bbd@fn@makefntext\@makefntext
\def\@makefntext#1{%
    \bbd@fn@dir
    \bbd@fn@makefntext{#1}%
}%

\let\bbd@orig@footnotetext\@footnotetext


\def\bbd@fn@deferred@footnotetext#1{%
    \global\let\bbd@fn@dir\setparRTL
    \bbd@orig@footnotetext{#1}%
}%

\def\bbd@fn@flush{%
    \ifbbd@fn@pending
        \global\bbd@fn@pendingfalse
        \the\bbd@fn@pending@toks
        \global\bbd@fn@pending@toks{}%
    \fi
}%

\def\@footnotetext#1{%
    \ifmmode
        \global\bbd@fn@pendingtrue
        \global\bbd@fn@pending@toks\expandafter{%
            \the\bbd@fn@pending@toks
            \bbd@fn@deferred@footnotetext{#1}%
        }%
        \aftergroup\bbd@fn@flush
    \else
        \bbd@orig@footnotetext{#1}%
    \fi
}%

\let\bbd@orig@fn@fntext\fn@fntext

\def\fn@fntext#1{%
    \ifmmode
        \global\let\bbd@fn@dir\setparRTL
    \fi
    \bbd@orig@fn@fntext{#1}%
}


% ------------------------------------------
% makebox r and l
% ------------------------------------------

\def\bm@l{%
    \if@RTL
        \hss\unhbox\@tempboxa
    \else
        \unhbox\@tempboxa\hss
    \fi
}
\let\bm@t\bm@l

\def\bm@r{%
    \if@RTL
        \unhbox\@tempboxa\hss
    \else
        \hss\unhbox\@tempboxa
    \fi
}
\let\bm@b\bm@r


% ------------------------------------------
% tabular alignment
% ------------------------------------------

\def\bbd@swap@lr@chnum@do{%
    \ifcase\@chnum\relax
    \or
        \@chnum=\tw@
    \or
        \@chnum=\@ne
    \fi
}

\def\bbd@swap@lr@chnum{%
    \if@RTL
        \bbd@swap@lr@chnum@do
    \fi
}

\def\bbd@patch@kernel@tabular{%
    \@ifundefined{bbd@kernel@tabular@patched}{%
        \@ifundefined{@tabclassz}{}{%
            \let\bbd@orig@tabclassz\@tabclassz
            \def\bbd@kernel@tabular@patched{}%
            \def\@tabclassz{%
                \bbd@swap@lr@chnum
                \bbd@orig@tabclassz
            }%
        }%
    }{}%
}

\def\bbd@patch@array@tabular{%
    \@ifundefined{bbd@array@tabular@patched}{%
        \@ifundefined{@classz}{}{%
            \let\bbd@orig@classz\@classz
            \def\bbd@array@tabular@patched{}%
            \def\@classz{%
                \bbd@swap@lr@chnum
                \bbd@orig@classz
            }%
        }%
    }{}%
}


\AddToHook{package/array/after}{%
    \bbd@patch@array@tabular
}%
\AddToHook{begindocument}{%
    \@ifpackageloaded{array}{%
        \bbd@patch@array@tabular
    }{%
        \bbd@patch@kernel@tabular
    }%
}%


% ------------------------------------------
% multicol
% ------------------------------------------

\AddToHook{env/multicols/begin}{%
    \if@RTL
        \RLmulticolcolumns
    \else
        \LRmulticolcolumns
    \fi
}



\makeatother

\endinput