%D \module
%D   [      file=s-fonts-variable,
%D        version=2017.02.18,
%D          title=\CONTEXT\ Style File,
%D       subtitle=Show Variable Font Properties ,
%D         author=Hans Hagen,
%D           date=\currentdate,
%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.

% begin info
%
% title   : variable information (experimental)
%
% comment : variable fonts contain extra information styles, axis, regions
% status  : experimental, used for luatex testing
%
% end info

\startmodule[fonts-variable]

\registerctxluafile{s-fonts-variable}{}

\installmodulecommandluasingle \showfontvariations {moduledata.fonts.variable.showvariations}

\unexpanded\def\showfontspacing
  {\begingroup
   \scratchskip \interwordspace plus \interwordstretch minus \interwordshrink
   \normalexpanded{\hpack\bgroup
      \tt\txx
      sp: \the\scratchskip\hskip\emwidth
      es: \the\extraspace \hskip\emwidth
      ex: \the\exheight   \hskip\emwidth
      em: \the\emwidth    \hskip\emwidth
   \egroup}%
   \endgroup}

\stopmodule

\continueifinputfile{s-fonts-variable.mkiv}

\usemodule[art-01]

\setuphead[section][before={\testpage[5]\blank[2*big]}]

% \enabletrackers[modules.fonts.variables.glyphs]
% \enabletrackers[modules.fonts.variables.kerns]

\starttext

    \startbuffer[zycon]
        \char008986\relax\quad
        \char009728\relax\quad
        \char010031\relax\quad
        \char010143\relax\quad
        \char011044\relax\quad
        \char127773\relax\quad
        \char127989\relax\quad
        \char128008\relax\quad
        \char128021\relax\quad
        \char128034\relax\quad
        \char128161\relax\quad
        \char128274\relax\quad
        \char128347\relax\quad
        \char128400\relax\quad
        \char128692\relax\quad
        \char129417\relax\quad
        \char129422\relax\quad
        \char983040\relax\par
    \stopbuffer

%     \showfontvariations
%       [font=file:adobevfprototype.otf]

%     \showfontvariations
%       [font=file:avenirnextvariable.ttf]

%     \showfontvariations
%       [font=file:DecoVar-VF.ttf]

  % \showfontvariations
  %   [font=file:VotoSerifGX.ttf,
  %    max=15]

%     \showfontvariations
%       [font=file:Selawik-Variable.ttf]

%     \showfontvariations
%       [font=file:LibreFranklinGX-Romans.ttf]

  % \showfontvariations
  %   [font=file:Zycon.ttf,
  %    sample={\getbuffer[zycon]}]

   % \showfontvariations
   %   [font=file:kairossansvariable.ttf]

   %  \showfontvariations
   %    [font=file:sourcecode-regular.otf]

   %  \showfontvariations
   %    [font=file:AmstelvarAlpha-VF.ttf]

  %  \showfontvariations
  %    [font=file:bahnschrift.ttf]

  % \showfontvariations
  %   [font=file:sitka.ttc]

\stoptext
