On 11/3/2022 2:03 PM, Thomas A. Schmitz via ntg-context wrote:
On 11/3/22 13:27, Henning Hraban Ramm via ntg-context wrote:
If it works for you, then it’s a problem of my installation, otherwise
a regression in current LMTX...
No, I get the same error message, this looks promising but doesn't work.
And at the risk of sounding grumpy, but all of this is too much manual
intervention; I would like to have a completely automated script. So
I'll show what I have and add a few comments:
local Feature_Table = { }
local Parsed_Features = { }
local My_Font = environment.arguments["font"]
local Font_Features = os.resultof("otfinfo -f " .. My_Font)
for Feature_Sigla, Feature_Name in
string.gmatch(Font_Features, "(%S-)\t(.-)\n") do
Feature_Table[Feature_Sigla] = Feature_Name
end
COMMENTS
Expectation: this should return a list of all features and their
descriptions as a lua table. If you run the file as
context test.cld --font="/path/to/font"
this works, and you get a table
Feature_Table={
["aalt"]="Access All Alternates",
["c2sc"]="Small Capitals From Capitals"} etc.
CODE
for name, _ in pairs(Feature_Table) do
Context_Name = "f:" .. name
Parsed_Features[name] = Context_Name
context.definefontfeature( { Context_Name }, { name="yes" } )
end
COMMENTS
This should produce a lua table with ConTeXt fontfeatures and define
those features. The table appears to be correct:
Parsed_Features={
["aalt"]="f:aalt",
["c2sc"]="f:c2sc"} etc.
So I expected that this should be equivalent to
\definefontfeature [f:aalt] [aalt=yes]
and return a list of defined features.
CODE
local Test_String = [[
ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz 1234567890 1/4 2/8
3/9 ffi ft fi fl ffl
]]
local Font_Name = os.resultof("otfinfo -a " .. My_Font)
context.definefontfamily( { "Test" }, { "serif" }, { Font_Name }, {} )
context.setupbodyfont{ "Test, 12pt" }
COMMENTS
Again, this works; the font is set as bodyfont.
CODE
context.starttext()
for name, feature in pairs(Feature_Table) do
context.start ()
context.addfeature { Parsed_Features[name] }
context.midaligned (feature)
context.bold (Parsed_Features[name])
context.par ()
context.blank{ "medium" }
context(Test_String)
context.par ()
context.stop ()
end
context.stoptext()
COMMENTS
And this doesn't work: the names are picked up, but the font features
are not defined; the sample text does not reflect any features. So this
is what I've got... maybe one of the wizards can help.
You're going way too complex. Access to features and info has alwaye
been part of mkic (and therefore lmtx). You can peek into the s-font*
styles for all kind of ways to get overviews. Anyway, the following
helper operates on the current font:
\starttext
\startluacode
function document.ShowFeatures(script)
local test = [[
ABCDEFGHIJKLMNOPQRSTUVWXYZ
abcdefghijklmnopqrstuvwxyz
1234567890
1/4 2/8 3/9
ffi ft fi fl ffl
]]
local font = fonts.hashes.identifiers[true]
local features = font.resources.features
-- inspect(features)
for name, detail in table.sortedhash(features.gsub) do
if #name == 4 then
context.type(name)
context.quad()
if script then
context.type(script)
context.quad()
end
-- this should be doen once in order to save memory
-- not too hard to do ..
context.definefontfeature(
{ "f:"..name },
{ [name] = "yes", script = script }
)
context.start()
context.addff("f:"..name)
context(test)
context.stop()
context.blank()
end
end
end
\stopluacode
\definedfont[LibertinusSerif-Regular.otf*always]
\ctxlua{document.ShowFeatures()}
% \ctxlua{document.ShowFeatures("latn")}
% \ctxlua{document.ShowFeatures("grek")}
\stoptext
But, be aware that (1) features can combine in weird ways, (2) some
features are only meant to be applied to a sunset of characters, (3)
some are driven by script and/or language. Also, (4) you need to load
the font without any features except the ones that enable node mode.
So, now you need to wikify ...
Hans
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