\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{xdvipskmaps}[2026/02/11 v1.0 luatex opentype map (ST)]

\newif\if@lua@fonts@debug
\DeclareOption{debug}{\global\@lua@fonts@debugtrue}
\chardef\otf@dvi@code=0
\DeclareOption{otfchar}{\global\chardef\otf@dvi@code=0}
\DeclareOption{otfgid}{\global\chardef\otf@dvi@code=1}
\DeclareOption{otfgidx}{\global\chardef\otf@dvi@code=2}
\chardef\place@glyph@on=0
\DeclareOption{chars}{\global\chardef\place@glyph@on=1}
\ProcessOptions

\RequirePackage{luatexbase}
\RequireLuaModule{xdvipskmaps}

\if@lua@fonts@debug
    \directlua{config.xdvipskmaps.debug=true}
\fi

\directlua{%
    xdvipskmaps.extra_maps = (tonumber('\number\otf@dvi@code') == 1);
    xdvipskmaps.place_glyphs = (tonumber('\number\place@glyph@on') > 0);
    local standard_luatex = callback.list()['font_definition'] == nil
    if standard_luatex then
       if tonumber('\number\otf@dvi@code') > 0 then
          luatexbase.module_warning('xdvipskmaps', "Only the `otfchar` option is available in standard `LuaTeX`!")
          token.set_char("otf@dvi@code", 0, "global")
       end
       if xdvipskmaps.place_glyphs then
          luatexbase.module_warning('xdvipskmaps', "The `chars` option is not available in standard `LuaTeX`!")
          xdvipskmaps.place_glyphs = false
       end
    end     
    }

\ifcase\number\otf@dvi@code\relax %% \relax as guard
    \directlua{%
        xdvipskmaps.otfgid=false;
        luatexbase.add_to_callback('buildpage_filter', xdvipskmaps.buildpage_filter_callback, 'xdvipskmaps buildpage filter')%
        if xdvipskmaps.place_glyphs then
            %% Doesn’t work with the standard LuaTeX engine!
            luatexbase.callbacktypes['place_glyph'] = 1
            luatexbase.add_to_callback('place_glyph', xdvipskmaps.place_glyph, 'place_glyph')
            xdvipskmaps.fd = io.open(tex.jobname .. '.chars.csv', 'w')
        end
        }%
\else\relax %% \relax just in case
    %% Doesn’t work with the standard LuaTeX engine!
    \directlua{%
        xdvipskmaps.otfgid=true;
        %% mapline DVI special sample in DVI for OpenType fonts
        %% xxx [lmroman10-regular]:+tlig;  LMRoman10-Regular "LMRoman10-Regular" >$SELFAUTOPARENT/texmf-dist/fonts/opentype/public/lm/lmroman10-regular.otf
        luatexbase.callbacktypes['font_definition'] = 1
        luatexbase.add_to_callback('font_definition', xdvipskmaps.font_definition, 'xdvipskmaps_font_definition')
        %% switch to using GID encoding in DVI
        if pdf.setdviencoding ~= nil then
           pdf.setdviencoding(1)
        else
           %% DVI special to set GID encoding flag for xdvipsk
           %% xxx vtex:settings.xdvipsk.opentype={enc=gid}
           luatexbase.callbacktypes['after_dvi_header'] = 1
           luatexbase.add_to_callback('after_dvi_header', function(...) return 1 end, 'after_dvi_header')
        end
        %% get information about glyphs in DVI
        if xdvipskmaps.place_glyphs then
           luatexbase.callbacktypes['place_glyph'] = 1
           luatexbase.add_to_callback('place_glyph', xdvipskmaps.place_glyph, 'place_glyph')
           local fname = tex.jobname .. '.chars.csv'
           xdvipskmaps.fd = io.open(fname, 'w')
        end
        luatexbase.add_to_callback('buildpage_filter', xdvipskmaps.place_glyph_end, 'buildpage_filter_place_glyph')%
        }%
\fi
%% set OpenType font marker in DVI file
\AtBeginDvi{\special{vtex:info.fonts.otf=1}}
\endinput