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%D \module
%D [ file=meta-imp-placeholders,
%D version=2021.02.01,
%D title=\METAPOST\ Graphics,
%D subtitle=Missing Glyph Placeholders,
%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.
%D This is a drop in for the already existing placeholder function. It could be made
%D more clever by hashing similar shapes but as this is mostly a diagnostic feature
%D we go a quick an ddirty two dimensional array.
%D It is now mostly a file one can run to get an idea what the replace macro triggers
%D so I've added it to the distribution.
% \startMPcalculation{simplefun}
% loadfile("mp-miss.mpxl") ;
% \stopMPcalculation
%
% \startluacode
%
% local chardata = characters.data
% local fontdata = fonts.hashes.identifiers
% local mapping = fonts.checkers.mapping
%
% function fonts.checkers.placeholder(font,char)
% local category = chardata[char].category or "lu" -- todo: unknown
% local fakedata = mapping[category]
% local tfmdata = fontdata[font]
% local units = tfmdata.parameters.units or 1000
% local slant = (tfmdata.parameters.slant or 0)/65536
% local scale = units/1000
% local rawdata = tfmdata.shared and tfmdata.shared.rawdata
% local weight = (rawdata and rawdata.metadata and rawdata.metadata.pfmweight or 400)/400
% local specification = {
% code = "MissingGlyph",
% scale = scale,
% slant = slant,
% weight = weight,
% namespace = font,
% shapes = { { shape = fakedata[1], color = fakedata[2] } },
% }
% fonts.helpers.setmetaglyphs("missing", font, char, specification)
% end
%
% \stopluacode
%D We enable the checker:
% \enabletrackers[fonts.missing=replace]
\replacemissingcharacters
\continueifinputfile{meta-imp-placeholders.mkxl}
% \enableexperiments[fonts.compact]
% \showglyphs
\startbuffer
\startlines[before=,after=]
\strut {\tf test \char 12345\ test \char 12346\ test}
\strut {\bf test \char 12345\ test \char 12346\ test}
\strut {\it test \char 12345\ test \char 12346\ test}
\strut {\bi test \char 12345\ test \char 12346\ test}
\strut {test ὀ ρ φ α ν ῖ ο ς test}
\stoplines
\stopbuffer
\starttext
\startTEXpage[offset=2pt,strut=no]
\getbuffer
\switchtobodyfont[pagella]
\getbuffer
\switchtobodyfont[dejavu]
\getbuffer
\stopTEXpage
\stoptext
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