I found a solution.
\startluacode
fonts.handlers.otf.addfeature {
name = "ktest",
type = "kern",
data = {
["t"] = { ["e"] = 500 },
}
}
\stopluacode
\definefontfeature[ktest][ktest=yes]
\definefont[1][Serif*ktest]
\starttext
\1 test \ctxlua{
local fnt = font.current()
local tfmdata = fonts.hashes.identifiers[fnt]
local t = string.byte("t")
local e = string.byte("e")
local kern = 0
for kind in pairs(tfmdata.shared.rawdata.lookupcache) do
kern = kern + fonts.handlers.otf.getkern(tfmdata,t,e,kind)
end
context(kern / tfmdata.parameters.factor) % 500
}
\stoptext
On 6/02/19 9:27 AM, Henri Menke wrote:
> Dear list,
>
> I am trying to access extra kerning that I have defined using
> fonts.handlers.otf.addfeature. Even though I query the kerning from
> within a paragraph where the kerning is evidently applied I can't seem
> to get the value stored earlier, see the comment in the MWE. What am I
> doing wrong?
>
> Cheers, Henri
>
> ---
>
> \startluacode
> fonts.handlers.otf.addfeature {
> name = "ktest",
> type = "kern",
> data = {
> ["t"] = { ["e"] = 500 },
> }
> }
> \stopluacode
>
> \definefontfeature[ktest][ktest=yes]
>
> \definefont[1][Serif*ktest]
>
> \starttext
>
> \1 test \ctxlua{
> local fnt = font.current()
> local tfmdata = fonts.hashes.identifiers[fnt]
> local t = string.byte("t")
> local e = string.byte("e")
> local kern = fonts.handlers.otf.getkern(tfmdata,t,e)
> context(kern) % 0 instead of 500. Why?
> }
>
> \stoptext
>
> ---
>
> P.S.: I have posted the same question on the LuaTeX list, but with a
> different MWE.
>
> -------- Forwarded Message --------
> Subject: How to query fonts.handlers
> Date: Mon, 4 Feb 2019 15:00:12 +1300
> From: Henri Menke <henrime...@gmail.com>
> To: LuaTeX discussion. <lua...@tug.org>
>
> Dear list,
>
> I am trying to access extra kerning that I have defined using
> fonts.handlers.otf.addfeature. Even though I query the kerning from
> within a paragraph where the kerning is evidently applied I can't seem
> to get the value stored earlier, see the comment in the MWE. What am I
> doing wrong?
>
> Cheers, Henri
>
> ---
>
> \input luaotfload.sty
>
> \directlua{
> fonts.handlers.otf.addfeature {
> name = "ktest",
> type = "kern",
> data = {
> ["t"] = { ["e"] = 500 },
> }
> }
> }
>
> \font\1="lmroman10-regular.otf:+ktest" at 10pt
> \1
>
> test%
> \directlua{
> local fnt = font.current()
> local tfmdata = fonts.hashes.identifiers[fnt]
> local t = string.byte("t")
> local e = string.byte("e")
> local kern = fonts.handlers.otf.getkern(tfmdata,t,e)
> tex.sprint(kern) % 0 instead of 500. Why?
> }
>
> \bye
>
>
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