\ProvidesPackage{librecaslon}[%
   2020/07/24 (Bob Tennent)  Supports LibreCaslon fonts for xeLaTeX and luaLaTeX. ] 

\RequirePackage{iftex}

\ifpdftex
\PackageError{librecaslon}{%
 *****************************************\MessageBreak
  Please process using XeLaTeX or luaLaTeX\MessageBreak
 *****************************************}
\fi  

\newif\iflibrecaslon@lining \librecaslon@liningtrue

\newcommand*{\LibreCaslon@scale}{1}  
\RequirePackage{xkeyval}
\DeclareOptionX{scaled}{\renewcommand*{\LibreCaslon@scale}{#1}}
\DeclareOptionX{scale}{\renewcommand*{\LibreCaslon@scale}{#1}}

\DeclareOptionX{lining}[true]{%
\@nameuse{if#1}%
  \librecaslon@liningtrue
\else
  librecaslon@liningfalse
\fi
}
\DeclareOptionX{lf}[true]{%
\@nameuse{if#1}%
  \librecaslon@liningtrue
\else
  librecaslon@liningfalse
\fi
}
\DeclareOptionX{oldstyle}[true]{%
\@nameuse{if#1}%
  \librecaslon@liningfalse
\else
  \librecaslon@liningtrue
\fi
}

\DeclareOptionX{osf}[true]{%
\@nameuse{if#1}%
  \librecaslon@liningfalse
\else
  \librecaslon@liningtrue
\fi
}

\ProcessOptionsX\relax

  \iflibrecaslon@lining
    \def\librecaslon@figurestyle{Monospaced}
  \else
    \def\librecaslon@figurestyle{OldStyle}
  \fi

\RequirePackage{fontspec}

  \ifxetex\XeTeXtracingfonts=1\fi
  \defaultfontfeatures{
     Ligatures = TeX ,
     Extension = .otf ,
     Scale     = \LibreCaslon@scale ,
  }
  \setmainfont
      [ Numbers = {\librecaslon@figurestyle},
        UprightFont    = *-Regular ,
        ItalicFont     = *-Italic ,
        BoldFont       = *-Bold , 
        ]
      {LibreCaslonText}
  \providecommand\useosf{%
    \edef\librecaslon@figurestyle{OldStyle}
    \defaultfontfeatures{
       Ligatures = TeX ,
       Extension = .otf ,
       Scale = \LibreCaslon@scale ,
    }
    \setmainfont
        [ Numbers = {\librecaslon@figurestyle},
          UprightFont    = *-Regular ,
          ItalicFont     = *-Italic ,
          BoldFont       = *-Bold , 
          ]
        {LibreCaslonText}
    \defaultfontfeatures{}
  }
  \newfontfamily\librecaslon
      [ Numbers = {\librecaslon@figurestyle},
        UprightFont    = *-Regular ,
        ItalicFont     = *-Italic ,
        BoldFont       = *-Bold , 
        ]
      {LibreCaslonText}
  \newfontfamily\librecaslonOsF
        [ Numbers = {OldStyle},
        UprightFont    = *-Regular ,
        ItalicFont     = *-Italic ,
        BoldFont       = *-Bold , 
        ]
      {LibreCaslonText}
  \newfontfamily\librecaslonLF
        [ Numbers = {},
        UprightFont    = *-Regular ,
        ItalicFont     = *-Italic ,
        BoldFont       = *-Bold , 
        ]
      {LibreCaslonText}
  \newfontfamily\librecaslonTLF
        [ Numbers = {Monospaced},
        UprightFont    = *-Regular ,
        ItalicFont     = *-Italic ,
        BoldFont       = *-Bold , 
        ]
      {LibreCaslonText}

  \providecommand\sufigures{\librecaslonOsF\addfontfeatures{VerticalPosition=Superior}}  
  \providecommand\infigures{\librecaslonOsF\addfontfeatures{VerticalPosition=ScientificInferior}}


\DeclareTextFontCommand{\textsu}{\sufigures}
\DeclareTextFontCommand{\textin}{\infigures}

% turn off defaults in case other fonts are selected:
  \defaultfontfeatures{}

\endinput

