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Subject: [bug#57963] [PATCH v5 2/2] home: services: Support user's fontconfig
 configuration.
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From: Taiju HIGASHI <higashi@taiju.info>
References: <87k053sxur.fsf@gnu.org> <87zgdzat99.fsf@trop.in>
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Hi,

Taiju HIGASHI <higashi@taiju.info> writes:

> Taiju HIGASHI <higashi@taiju.info> writes:
>
>> Hi,
>>
>> Ludovic Court=C3=A8s <ludo@gnu.org> writes:
>>
>>> Hi,
>>>
>>> Taiju HIGASHI <higashi@taiju.info> skribis:
>>>
>>>> Andrew Tropin <andrew@trop.in> writes:
>>>
>>> [...]
>>>
>>>>>> Andrew Tropin <andrew@trop.in> skribis:
>>>>>>
>>>>>>> If serialization would support G-exps, we could write
>>>>>>>
>>>>>>> (list #~"RAW_XML_HERE")
>>>>>>
>>>>>> There=E2=80=99s a one-to-one lossless mapping between XML and SXML, =
so I don=E2=80=99t
>>>>>> think it makes sense to support XML-in-strings when we have SXML.
>>>>>>
>>>>>> The only thing it would give us, as I see it, is the ability to gene=
rate
>>>>>> syntactically-invalid XML.  Maybe we can live without it?  :-)
>>>>>
>>>>> Of course we can :), but we won't be able:
>>>>>
>>>>> 1. To take already existing xml config and use it without rewriting.
>>>>
>>>> I find it surprisingly important to be able to simply copy and paste
>>>> settings without having to rewrite existing settings or those listed on
>>>> a web page somewhere.  I know we can easily convert from XML to SXML,
>>>> but those unfamiliar with SXML may find it a bothering task.
>>>
>>> OK, that makes sense.
>>>
>>> But then, let=E2=80=99s not allow users to intersperse XML-in-strings i=
n the
>>> middle of XML.  It should be either a user-provided file/string or the
>>> generated config, but not a mixture of both; that=E2=80=99d be a recipe=
 for
>>> confusion.
>>>
>>> How about this: the service takes either a <fontconfig-configuration>
>>> record or a file-like object?
>>>
>>> (We can even have a =E2=80=9Cgexp compiler=E2=80=9D for <fontconfig-con=
figuration> to
>>> make that transparent.)
>>
>> Thank you for your consideration.
>>
>> That idea sounds good.  I don't know if I can successfully implement
>> this, but I will consider it and give it a try.
>>
>> Thanks,
>
> I'm trying to implement the following, is it consistent with the intent
> of what you suggested?
>
> (define (add-fontconfig-config-file user-config)
>   `(("fontconfig/fonts.conf"
>      ,(if (home-fontconfig-configuration? user-config)
>           (mixed-text-file
>            "fonts.conf"
>            "<?xml version=3D'1.0'?>
> <!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
> <fontconfig>"
>            (serialize-configuration user-config home-fontconfig-configura=
tion-fields)
>            "</fontconfig>\n")
>           user-config))))
>
>
> It is assumed that configurations can be specified in one of the
> following ways.
>
> * fontconfig-configuration:
>
> (home-environment
>  (packages (list font-google-noto))
>  (services
>   (append
>       (list
>        (service home-bash-service-type))
>       (modify-services %home-base-services
>         (home-fontconfig-service-type
>          config =3D> (home-fontconfig-configuration
>                     (font-directories
>                      (cons* "~/fonts" %home-fontconfig-base-font-director=
ies))
>                     (default-font-serif-family "Noto Serif CJK JP")
>                     (default-font-sans-serif-family "Noto Sans Serif CJK =
JP")
>                     (default-font-monospace-family "PlemolJP Console")
>                     (extra-config
>                      '(foo "bar"))))))))
>
>
> Note:
> %home-fontconfig-base-font-directories is the new variable I plan to
> export as the default value, based on Andrew's and Liliana's point.
>
> * file-like objects:
>
> (home-environment
>  (packages (list font-google-noto))
>  (services
>   (append
>       (list
>        (service home-bash-service-type))
>       (modify-services %home-base-services
>         (home-fontconfig-service-type
>          config =3D> (local-file "/path/to/your/fonts.conf"))))))
>
> Thanks,

Sorry for the long time it has taken to resolve the issue.
What do you think about it?

Thanks,
--=20
Taiju