On 12/25/2021 12:04 AM, Bruce Horrocks via ntg-context wrote:
On 24 Dec 2021, at 18:34, Thomas Savary via ntg-context <ntg-context@ntg.nl>
wrote:
Hello, dear list !
In order to fix a few bugs in some OpenType features included in EB Garamond
font provided by Google Fonts, I am trying to remove some ligatures (erroneous
in some contexts) with fonts.handlers.otf.addfeature.
I must be missing something, because I can't get it to work.
Here is a minimal —non working—example :-)
(The attempted removal (“f_i” → “fi” only before “o”) is of course irrelevant.
I chose it just for the sole purpose of this test, to provide a simple example.
What I am trying to achieve is more complex, with other ligatures.)
fonts.handlers.otf.addfeature{
name = "unfio",
type = "chainsubstitution",
lookups = {
{ type = "multiple",
data = { [ "f_i" ] = { "f", "i" } }
}
}
rules = {
{ after = { { "o" } },
current = { { "f_i" } },
lookups = { 1 } }
}
}
}
Could someone please explain to me what I did wrong ?
Firstly, you have an extra } in the example above.
Secondly, rules need to come inside a data section. Thus (untested):
fonts.handlers.otf.addfeature{
name = "unfio",
type = "chainsubstitution",
lookups = {
{
type = "substitution",
data = {
[ "f_i" ] = { "f", "i" }
}
}
},
data = {
rules = {
{
after = { { "o" } },
current = { { "f_i" } },
lookups = { 1 }
}
}
}
}
A better an dmore reliable approach is this:
\startluacode
local demo = {
name = "demo",
options = {
{
patterns = {
fio = "f|io",
},
words = [[ fioot fiots ]],
},
},
}
table.save("oeps-fixes.llg",demo)
\stopluacode
\setuplanguage[en][goodies={oeps-fixes.llg}]
\setupbodyfont[ebgaramond]
\starttext
fiets fiots fiats fioot
\stoptext
because you want to block certain ligatures but keep kerning etc (see
older posts for more extensive examples)
Hans
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