% Babelbidi: Bidirectional typesetting support for Babel.
%
% Copyright (C) 2026 Amer Amikhteh
%
% This package 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 package 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.
%
% This package consists of the file babelbidi.sty and the files
% distributed with it.

\NeedsTeXFormat{LaTeX2e}

\ProvidesPackage{babelbidi}
[2026/10/19 v0.3.1 Bidi extensions for Babel]

\RequirePackage{iftex}
\RequirePackage{xkeyval}

% ------------------------------------------------
% Package options
% ------------------------------------------------

\define@key{bbd}{bidi}{%
  \gdef\bbd@bidi{#1}%
}

\define@key{bbd}{layout}{%
  \edef\bbd@layout{#1}%
}

\def\bbd@layout{}

\ifPDFTeX
  \setkeys{bbd}{bidi=default}
\fi

\ifXeTeX
  \setkeys{bbd}{bidi=bidi-r}
\fi

\ifLuaTeX
  \setkeys{bbd}{%
    bidi=basic,
    layout=counters graphics footnotes lists
  }
\fi

\DeclareOptionX{bidi}{%
  \setkeys{bbd}{bidi=#1}%
}

\DeclareOptionX{layout}{%
  \setkeys{bbd}{layout=#1}%
}

\DeclareOptionX*{%
  \edef\bbd@options{%
    \bbd@options,\CurrentOption
  }%
}

\def\bbd@options{}

% Cache Babel's repeated font mappings within each LuaTeX run.
\newif\ifbbd@font@cache
\bbd@font@cachetrue

\DeclareOptionX{fontcache}[true]{%
  \edef\bbd@fontcache@option{#1}%
  \def\bbd@fontcache@true{true}%
  \def\bbd@fontcache@false{false}%
  \ifx\bbd@fontcache@option\bbd@fontcache@true
    \bbd@font@cachetrue
  \else\ifx\bbd@fontcache@option\bbd@fontcache@false
      \bbd@font@cachefalse
    \else
      \PackageError{babelbidi}{Invalid fontcache value '#1'}%
      {Use fontcache=true or fontcache=false.}%
    \fi\fi
}

\DeclareOptionX{code}{%
  \PassOptionsToPackage{code=#1}{babelbidi-lang}%
}

\DeclareOptionX{latin}{%
  \PassOptionsToPackage{latin=#1}{babelbidi-lang}%
}

\DeclareOptionX{ltr}{%
  \PassOptionsToPackage{ltr=#1}{babelbidi-lang}%
}

\DeclareOptionX{rtl}{%
  \PassOptionsToPackage{rtl=#1}{babelbidi-lang}%
}

\ProcessOptionsX\relax

% ------------------------------------------------
% Beamer class detection
% ------------------------------------------------

\newif\ifbbd@beamer
\@ifclassloaded{beamer}{\bbd@beamertrue}{}

\newif\ifbbd@beamerrl
\@ifclassloaded{beamer-rl}{\bbd@beamerrltrue}{}

% ------------------------------------------------
% Arabic and Beamer compatibility
% ------------------------------------------------

\@ifundefined{if@rl}{%
  \newif\if@rl
}{}

\ifPDFTeX
  \ifbbd@beamer
    % \addto\extraarabic{
    \providecommand{\labelitemiv}
    {\if@rl\protect $-$ %
      \else\protect\textperiodcentred\fi}
    \providecommand{\labelitemi}
    {\if@rl\protect\textLR{$\bullet$}
      \else\protect\textbullet\fi}

    \providecommand{\labelitemii}
    {\if@rl\protect\textLR{$\circ$} %
      \else\protect\textLR{ \normalfont\bfseries\textendash}\fi}

    \providecommand{\labelitemiii}
    {\if@rl\protect\textLR{$*$} %
      \else\protect\textasteriskcentered\fi}

    \providecommand{\labelenumi}
    {\if@rl(\I{\number\c@enumi}).%
      \else{\number\c@enumi}.\fi}

    \providecommand{\labelenumii}
    {\if@rl\abjadnumeral{\number\c@enumii}. %
      \else({\number\c@enumii})\fi}

    \providecommand{\labelenumiii}
    {\if@rl\I{\number\c@enumiii}$\space-\space$ %
      \else({\number\c@enumiii})\fi}

    \providecommand{\labelenumiv}
    {\if@rl\abjadnumeral{\number\c@enumiv}$\space-\space$ %
      \else({\number\c@enumiv})\fi}
    % }
  \fi \fi

% ------------------------------------------------
% Engine setup
% ------------------------------------------------

\ifPDFTeX

  \RequirePackage[bidi=\bbd@bidi,\bbd@options]{babel}
\fi

\ifXeTeX
  \RequirePackage[
    bidi=\bbd@bidi,
    \bbd@options
  ]{babel}
\fi

\ifLuaTeX
  \ifbbd@beamerrl
  \else
    \RequirePackage[
      bidi=\bbd@bidi,
      layout=\bbd@layout,
      \bbd@options
    ]{babel}
  \fi
\fi

% Babel's language metadata must be ready before selecting the four aliases.
\RequirePackage{babelbidi-lang}

% ------------------------------------------------
% Keep counter direction markup out of label keys and link targets
% ------------------------------------------------

\long\def\bbd@firstofone#1{#1}

\AddToHook{begindocument/before}{%
  \@ifundefined{babelsublr}{}{%
    \let\bbd@label\label
    \protected\def\label#1{%
      \begingroup
      \let\babelsublr\bbd@firstofone
      \let\babelsubrl\bbd@firstofone
      \edef\bbd@tmp{#1}%
      % Restore display formatting before writing the reference value.
      \expandafter\endgroup
      \expandafter\bbd@label\expandafter{\bbd@tmp}%
    }
    % Hyperref runs this hook inside its link-target group.
    \AddToHook{makelinktarget}{%
      \let\babelsublr\bbd@firstofone
      \let\babelsubrl\bbd@firstofone
    }%
  }
}

% ------------------------------------------------
% Load package components
% ------------------------------------------------

% Beamer box compatibility.
\ifbbd@beamer
  \ifbbd@beamerrl
  \else
    \ifLuaTeX \input{babelbidi-beamer.def} \fi
  \fi
\fi

\input{babelbidi-api.def}
\ifLuaTeX  \input{babelbidi-onchar.def} \fi
\ifLuaTeX
  \input{babelbidi-fontfallback.def}
\else
  \NewDocumentCommand{\fontfallback}{m m}{%
    \PackageWarning{babelbidi}{Font fallback requires LuaLaTeX; declaration ignored}%
  }
\fi
\ifTUTeX
  \input{babelbidi-fonts.def}
\fi

% The .def files reset @; restore it before reading the remaining code.
\makeatletter

% Delay engine and code patches until the preamble is complete.
\AddToHook{begindocument/before}{%
  \ifXeTeX    \input{babelbidi-xetex.def}     \fi
  \ifLuaTeX   \input{babelbidi-luatex.def}    \fi

  \bbd@if@latin{\bbl@main@language}%
  \ifbbd@latin
  \else
    \input{babelbidi-code.def}%
  \fi
}

% Run after babelbidi-api.def has set the main direction.
\AddToHook{begindocument}{
  \if@RTLmain
    \input{babelbidi-layout.def}
  \fi}

% ------------------------------------------------
% Minted patches
% ------------------------------------------------

\AddToHook{package/minted/after}{%
  \mintedpgfkeyscreate{tex}{textlanguage=}%
  \AddToHook{cmd/minted@usefvopts/after}{%
    \edef\bbd@minted@textlanguage{\mintedtexoptvalueof{textlanguage}}%
    \ifx\bbd@minted@textlanguage\@empty\else
      \selectlanguage{\bbd@minted@textlanguage}%
    \fi
  }%
  \ifLuaTeX
    \AddToHook{env/minted/begin}{%
      % Frame overlays are zero-width boxes anchored at the left edge.
      % Their geometry must stay LTR when the code language changes.
      \patchcmd\FV@SingleFrameLine
      {\hbox to\z@}{\hbox dir TLT to\z@}{}%
      {\PackageWarning{babelbidi}{Could not patch minted frame lines}}%
      \patchcmd\FV@SingleFrameSep
      {\hbox to \z@}{\hbox dir TLT to\z@}{}%
      {\PackageWarning{babelbidi}{Could not patch minted frame padding}}%
    }%
  \fi
}

% Keep code counters in Latin digits.
\@ifundefined{bbl@latinarabic}{}{%
  \let\bbd@arabic\@arabic
  \AddToHook{env/minted/before}{%
    \let\@arabic\bbl@latinarabic
  }%
  \AddToHook{env/minted/after}{%
    \let\@arabic\bbd@arabic
  }%
}%

\makeatother

\endinput