fmt/font.h


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%% Fonts
\newcount\thespacing
\newdimen\size
\begingroup
  \edef\specialAt{{ \string a\string t }}%
  \def\x#1{%
    \def\getfontsize##1=##2{% The user level macro
      \expandafter\getfontsizE\fontname##2#1\relax{##1}%
    }%
    \def\getfontsizE##1#1##2\relax##3{%
      \ifx*##2*% Loaded at designsize
        \begingroup
          \font\tmpfont"##1" scaled 2000
          \getfontsize\dimen0=\tmpfont
          \divide\dimen0 by 2
          \expandafter
        \endgroup
        \expandafter\getfontsiZe\the\dimen0\relax{##3}%
      \else% Otherwise #2 holds the size. But is is followed by " at ", so we have to strip that
        \getfontsiZE{##3}##2%
      \fi
    }%
    \def\getfontsiZE##1##2#1{##1=##2}% Strip " at "
    \def\getfontsiZe##1\relax##2{##2=##1}
  }
  \expandafter\expandafter\expandafter
\endgroup
\expandafter\x\specialAt % From StackOverflow
{
\catcode`\@=11

\global\let\f@nt\font

\gdef\spacing{
    \afterassignment\adjs \thespacing}
\gdef\adjs{%adjust spacing
    \baselineskip=\size \multiply\baselineskip by \thespacing
    \divide\baselineskip by 100\relax}

\gdef\font#1{%
    \def\orig{#1}\edef\realname{\csname\string#1@font\endcsname}
    \afterassignment\xfont
    \expandafter\f@nt\realname
}
\gdef\xfont{
    \expandafter\getfontsize\expandafter\dimen0\expandafter=\realname
    \expandafter\expandafter\expandafter\def
    \expandafter\orig\expandafter{\realname\size\dimen0\adjs}
}
}