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%% The chemformula-ru package eliminates an incompatibility
%% between the chemformula package and Russian settings (russian.ldf) of the babel package.
%%
%% Copyright (c) 2024 by Alexey Kuznetsov (mailtokuznetsov at gmail.com)
%%
%% This file may be distributed and/or modified under the
%% conditions of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%% The latest version of this license is in
%% http://www.latex-project.org/lppl.txt
%% and version 1.3c or later is part of all distributions of LaTeX
%% version 2008/05/04 or later.
%%
\ProvidesPackage{chemformula-ru}[2024-03-01 Using chemformula package with babel-russian]
\DeclareOption{cosh2ch}{\def\cosh@ch{\DeclareRobustCommand\cosh{\mathop{\operator@font ch}\nolimits}}}
\DeclareOption{ch2Ch}{\def\ch@Ch{\DeclareRobustCommand\Ch{\mathop{\operator@font ch}\nolimits}}}
\ProcessOptions\relax
\BeforeBeginEnvironment{document}{
\IfPackageLoadedTF{chemformula}{
\IfPackageLoadedWithOptionsTF{babel}{russian}{
\let\@Chem@Formula\ch \let\ch\undefined
\AtBeginDocument{ \let\ch\@Chem@Formula
\@ifundefined{cosh@ch}{\relax}{\cosh@ch}
\@ifundefined{ch@Ch}{\relax}{\ch@Ch}
}
} { \relax }
} { \relax }
}
\endinput
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