%% subtext.sty Look further down for brief description
%% 
%% Copyright (C) 2019 Palle Jorgensen
%% 
%% This program is free software: you can redistribute it and/or
%% modify it under the terms of the GNU General Public License as
%% published by the Free Software Foundation, either version 3 of the
%% License, or (at your option) any later version.
%% 
%% This program 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. See the GNU
%% General Public License for more details.
%% 
%% You should have received a copy of the GNU General Public License
%% along with this program. If not, see
%% <https://www.gnu.org/licenses/>.
    
\ProvidesPackage{subtext}[2019/05/30 v. 1.1 LaTeX package for easy
text-style subscripts in math mode.]

\RequirePackage{amstext}
\def\subtext@font{}
\DeclareOption{upright}{\def\subtext@font{\upshape}}
\DeclareOption{normal}{\def\subtext@font{\normalfont}}
\ProcessOptions*

\let\saved@sub_
\catcode`_\active
\def\new@sub@text[#1]{\saved@sub{\text{\subtext@font #1}}}
\def\new@sub@other#1{\saved@sub{#1}}

\def\new@sub{%
  \@ifnextchar[%]
  {\new@sub@text}{\new@sub@other}}
\protected\def_{\new@sub}


\endinput