On 7/16/2018 10:24, Fabrice Couvreur wrote:
> % macros=mkvi
>
> \setuppagenumbering[location=footer]
>
> \startusableMPgraphic{NumberHead}
>      draw outlinetext.f
>          ("\bf\namedheadnumber{chapter}")
>          (withcolor "lightgray")
>          ysized 50pt ;
> \stopusableMPgraphic
>
>
> \unexpanded\def\processMPheadnumber#1%
>   {\useMPgraphic{NumberHead}}
>
> \setuphead
>    [chapter]
>    [command=\HeadTitle,
>     headstyle=\ss,
>     numbercommand=\processMPheadnumber]
>
>
> \unexpanded\def\HeadTitle#1#2%
>   {\framed
>     [frame=off,
>     bottomframe=on,
>     width=broad,
>     align={broad,nothyphenated,left}]
>     {#1\blank[nowhite]#2}}
>
> \starttext
>
> \dorecurse{6}{\startchapter
>   [title={Fist chapter}]
>   \input knuth
> \stopchapter}
>
> \stoptext

Using TL18 on Win64 it produces a large chapter number on the right side 
above the chapter name -- I do not know what it should look like, so I 
won't say it works. It clearly fails with the 2018-07-13 beta, producing 
an odd graphic where the MP-generated digit should be:

and fails in the same manner with the 2018-07-17 beta.

-- 
Rik