Thanks for the quick response, Pablo.  I already use typescripts
(\definetypeface, \definefontsynonym and \definefontfallback):
https://github.com/bateni/dabeer/tree/master/texmf-local/tex/context/fonts/mkiv

By arbitrary style, I meant something like:

\definefontfamily[myface][CUSTOM][TeX Gyre Pagella]]

https://wiki.contextgarden.net/Font_Switching says fontstyle is rm, ss, tt,
mm, hw, cg, ...
Because the the three dots at the end, I thought it would be possible to
define new fontstyles.  But I get an error if I do so.

So I usually use \definefont to set up one-off fonts for specific use-cases
such as special headings or an artwork, etc.  I was wondering if I can
easily apply fontfallbacks for those.

On Mon, Feb 15, 2021 at 3:52 PM Pablo Rodriguez <oinos@gmx.es> wrote:

> On 2/15/21 8:47 PM, Mohammad Hossein Bateni wrote:
> > Hi,
> >
> > Is there a way to set the fallback for fonts when we define them not as
> > a typescript but using \definefont?
> >
> > \definefont[MyFont][Font.otf*MyFeatures]
> >
> > Is there a default fallback one can specify?
> > Is simplefonts module deprecated or discouraged now?
>
> Hi Mohammad,
>
> the simplefonts module has been deprecated, since it has been
> implemented in the ConTeXt core (see below).
>
> \definefontfallback might be the command you are looking for.
>
> > When we define a font via typescript commands, we can specify rm, ss,
> > tt, mm, hw and cg shapes for it.  Can we add arbitrary styles?
> > For example, I would use this for quotations, headings, etc.  Currently,
> > I either have to spare ss or use \definefont for such scenarios.
>
> The new commands are \definefallbackfamily and \definefontfamily.
>
> A sample document, in case it might help (GFS Heraklit at
> https://greekfontsociety-gfs.gr/_assets/fonts/GFS_Heraklit.zip):
>
>   \definefallbackfamily
>     [mainface]
>     [rm]
>     [GFS Heraklit]
>     [preset=range:greek,
>      force=yes]
>
>   \definefontfamily
>     [mainface]
>     [rm]
>     [TeX Gyre Pagella]
>
>   \setupbodyfont
>     [mainface]
>
>   \starttext
>     \agr\input aristotle-grc
>
>     \de\input aesop-de
>   \stoptext
>
> Sorry, but unless you provide a minimal sample, it isn’t easy to guess
> what you might have in mind.
>
> I’m afraid that I’m not sure whether the following sample contains your
> “arbitrary styles”.
>
>   \setupinteractionscreen[option=max]
>
>   \definefontfamily
>     [mainface]
>     [rm]
>     [TeX Gyre Pagella]
>     [it={TeX Gyre Cursor-Italic},
>      bf={TeX Gyre Adventor-Bold},
>      bi={TeX Gyre Termes-BoldItalic}]
>
>   \setupbodyfontenvironment
>     [default]
>     [em=italic]
>
>   \setupbodyfont[mainface]
>
>   \starttext
>   \startTEXpage[offset=1em]
>   Roman font {\em & italic}
>
>   {\bf Bold font \em & bold italic}
>   \stopTEXpage
>   \stoptext
>
> Feel free to explain what your needs are.
>
> I hope it helps,
>
> Pablo
> --
> http://www.ousia.tk
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
>
> ___________________________________________________________________________________
>