[NTG-context] Remove umlauts etc. from input

[Wolfgang Schuster <wolfgang.schuster.lists@gmail.com>]

Hi,

is there an already existing option to reduce umlauts etc. to ascii 
counterparts, e.g.

     \starttext
     Füße
     \stoptext

results in

     Fusse


The fonts manual gives an example for a font feature with the desired 
output but it's possible I missed something or there is a better solution.


\startluacode

local shapedcodes = { }

for k, v in next, characters.data do
     local s = v.shcode
     if s then
         if type(s) == "number" then
             shapedcodes[utf.char(k)] = { utf.char(s) }
         elseif #s == 2 then
             shapedcodes[utf.char(k)] = { utf.char(s[1]), utf.char(s[2]) }
         end
     end
end

fonts.handlers.otf.addfeature {
     name = "simplify",
     type = "multiple",
     data = shapedcodes,
}

\stopluacode

\definefontfeature [simplify] [simplify=yes]

\starttext
Füße \feature[+][simplify]Füße
\stoptext


Wolfgang

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