Raghav,

Raghav Gururajan 写道：
> Hello Guix!

o/

I haz returned.

> As of 2017, IANA (www.iana.org) has changed the standard 
> template for
> font media types.
>

Not so much changed, but that there was previously no standard. 
The W3C was displeased with the proliferation of ad-hoc, 
inconsistent font MIME types and created [SOURCE].

> So, font/freetype and font/opentype has to be updated to 
> font/ttf and
> font/otf, respectively.

For people who deal with MIMEs, yes, but how does this affect a 
package manager like Guix?  We don't.

> Almost all font packages in guix, are using the old 
> specification.

Where?

> I have updated font-gnu-freefont a while ago. We need to update 
> other
> packages. Any ideas on how to change them all in a time-saving 
> way?

Are you talking about 5483a2d0a913fe533744699e9ef5757c6e3f6983?

Aside... I know others have mentioned this before, and this is 
another example of a commit that should have been split.  It 
silently moves the TTF fonts from /share/fonts/truetype to 
/share/fonts/ttf for reasons that aren't explained anywhere and 
aren't related to the stated goal.

Was this RFC the reason?  If so you're confusing two unrelated 
things.

  $ ls ~/.guix-profile/share/fonts
  cantarell/  opentype/  truetype/

(Seeing this I might change cantarell to use ‘opentype’, or not, 
because it's purely a matter of taste.)

These directory names are for humans.  I think ‘truetype’ was 
better than ‘ttf’.

Kind regards,

T G-R

> [SOURCE]: 
> https://www.iana.org/assignments/media-types/media-types.xhtml#font