Re: fontconfig priority management

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Le 2018-10-18 08:04, Akira TAGOH a écrit :
On Wed, Oct 17, 2018 at 10:03 PM Nicolas Mailhot
<nicolas.mailhot@xxxxxxxxxxx> wrote:
You seem to be thinking about generating current fontconfig syntax from templates in rpm macros. I definitively don't want to go there in Fedora
font packages. Such generators are quite brittle and hell to
debug/maintain. They're sort of ok for third party tools that try to
coax fontconfig on doing things, they're not ok as distro core
infrastructure. If you want to generate from rpm macros, you need to
define something that can be generated simply (and current fontconfig
syntax is not that).

How is it that hell to debug/maintain?

Well, basically, some of the things you need to pass to fontconfig are structured data (for example, lists of font families a font family can substitute/be substituted). And rpm has no notion of structured data, just individual variables. So sure, you can hack something at the rpm macro level, but it will be ugly and awkward to use, unless you mandate the use of a separate config file that uses a syntax adapted to structured data (xml, json, yaml, whatever).

And when you get to this point, giving the config file to fontconfig directly, makes loads more sense. That means you can change what you do with the config files in a central point, post deployment even, instead of needing to rebuild and reinstall every single font package every time you have a better idea on how things should be done.

Regards,

--
Nicolas Mailhot
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