On 28-10-2010 7:48, Ulrike Fischer wrote:
Hm. I do have a bit the impression as if we have here a context and
latex philosophy clash. I'm not asking you to provide a funktion
Huh? I'm not sure what philosophy refers to, as I'm not refering to
context but to the otf loading code; so it would be a function in the
lua code base (it would not even be interfaced to context as it would
invalidate most of the characters in a font).
incorporated in the context code which does the job. _I_ want to
write support files for the chess ttf-fonts. If I get something
working I will perhaps add it to my package. And if something
changes in luatex or the underlying luaotfload/context code, well
then I will have to adjust my code.
Sure, but the first complaints would end up in khaleds, tacos or my
mailbox unless your package is private and never ends up in tex
distributions). The fact that it's custom in latex to overload code and
thus create a maintaince depency does not mean that I want such a
dependency on my code. The context philosophy is to provide hooks and
ignore all compliants about other usage cq. don't care about usage of
code that is not meant to be accesses directly. (Also, Khaled then
provides the interface to the latex packages.)
Couldn't you give some examples how to manipulate a font after it
has been defined with \font\test (if it is possible) and then let me
play around?
I have no clue about the lualatex interface i.e. at what point you can
hook in code. Keep in mind that messing around with a font before or
during loading can influence other instances of that font as some data
is shared. Also, once the font lives at the tex end, some data is
frozen. Because some of the font's metadata is used in otf processing
one cannot change that data without keeping that in mind.
Anyhow, you can access some font data afterwards. In context form:
\startluacode
function Whatever(name)
for k, v in pairs(fonts.ids[font.current()].descriptions) do
if v.name == name then
tex.sprint("\\char"..k.."\\relax")
break
end
end
end
\stopluacode
\font\test=file:pirat.ttf
\def\MyChessChar#1{{\test\directlua{Whatever("#1")}}}
\MyChessChar{c160}
This is dead slow and inefficient but as you don't want a proper
function for it I don't care too much. Interesting is that it does not
work out (as wis to be expected as the normal glyph access function does
something similar).
Btw, a bit of testing at my end shows that there is something fishy with
the font with respect to inclusion in the pdf so it can well be that the
accessor is ok and something else is the problem.
As taco mentioned in an earlier mail, we will look into it (even it
makes not much sense).
Hans
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