[NTG-context] Re: Use headcommand in \definedescription together with \definehighlight (now: \definestartstop)

[Gerion Entrup <gerion.entrup@flump.de>]

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Am Donnerstag, 27. Juni 2024, 22:19:02 MESZ schrieb Wolfgang Schuster:
> Gerion Entrup schrieb am 25.06.2024 um 08:41:
> > Am Dienstag, 25. Juni 2024, 00:09:09 MESZ schrieb Wolfgang Schuster:
> >> Gerion Entrup schrieb am 24.06.2024 um 23:57:
> >>> Am Montag, 24. Juni 2024, 21:20:19 MESZ schrieb Aditya Mahajan:
> >>>> On Mon, 24 Jun 2024, Gerion Entrup wrote:
> >>>>
> >>>>> Hi,
> >>>>>
> >>>>> I was in the process to convert an itemize part to a description and wanted to simplify the code in the same move.
> >>>>> I discovered headcommand for that, but struggled to set the text in an highlight _and_ make a colon at the end.
> >>>> Not sure what exactly you want, but how about:
> >>>>
> >>>> \definehighlight[hl][style={\m{>}\,\switchtobodyfont[tt]}]
> >>>> % This is the wrong way to define such a command as '>' is not part of the style. I have left this definition just for comparison with the soln below.
> >>> Is there a better way to define a highlight that sets a style (color, font) _and_ a prefix (symbol)?
> >>> Another way, I know of, would be just a plain def, something like \def{\hl}{\groupedcommand{>\,\switchtobodyfont[tt]}{}}, but actually I want to define a highlight (just with an additional prefix).
> >>
> >> 1. ConTeXt already uses \hl as name for a existing command.
> >>
> >> 2. Use \definestartstop:
> >>
> >> \definestartstop [gerion] [style=mono,left={›\thinspace}]
> >>
> >> \starttext
> >>
> >> text
> >>
> >> \gerion{text}
> >>
> >> \stoptext
> >>
> >>>> \definedescription[category][
> >>>> 	alternative=top,
> >>>> 	headstyle=bold,
> >>>> 	width=broad,
> >>>> ]
> >>>>
> >>>> \definedescription[desc][
> >>>> 	width=fit,
> >>>> 	distance={\widthofstring{~}},
> >>
> >> distance=\spaceamount,
> >>
> >> Wolfgang
> > 
> > This seems to be much better but does not lead to the wanted result. The full example now is:
> > ```
> > \definestartstop[myhl][style=mono,left={›\thinspace}]
> > 
> > \definedescription[categorie][
> > 	alternative=top,
> > 	headstyle=bold,
> > 	width=broad,
> > ]
> > 
> > \definedescription[desc][
> > 	width=broad,
> > 	distance=\spaceamount,
> > 	headcommand={\groupedcommand{\startmyhl}{\stopmyhl :}},
> > 	headstyle=,
> > 	before={\startpacked},
> > 	after={\stoppacked},
> > 	alternative=hanging
> > ]
> > 
> > \starttext
> > 
> > This is a \myhl{highlight}.
> > 
> > Some listings
> > 
> > \startcategorie{Itemize}
> > 	\startitemize[packed]
> > 		\item \myhl{first}: one
> > 		\item \myhl{second}: two
> > 	\stopitemize
> > \stopcategorie
> > 
> > Now the same as desc:
> > \startcategorie{Desc}
> > 	\startdesc{first} one \stopdesc
> > 	\startdesc{second} two \stopdesc
> > \stopcategorie
> > 
> > \stoptext
> > ```
> > 
> > This adopts the correct style in \startdesc \stopdesc and sets the colon but omits the › (the left part).
> 
> You can do the following in the next version.
> 
> 1. Add "arguments=yes" to \definestartstop to enable the optional 
> argument for the new command.
> 
> 2. Use the new commands with the "headcommand" key and apply ":" as 
> right delimiter for the content of \Highlight.
> 
> \definestartstop
>    [Highlight]
>    [arguments=yes,
>         style=mono,
>          left={›\thinspace}]
> 
> \definedescription
>    [description]
>    [      width=broad,
>        distance=\spaceamount,
>     headcommand=\Highlight[right=:],
>     alternative=hanging]
> 
> \starttext
> 
> This is a \Highlight{highlight}.
> 
> \startdescription[title={Lorem ipsum}]
> \samplefile{lorem}
> \stopdescription
> 
> \stoptext
> 
> Wolfgang

Thanks, that will work.
Do you know, why the groupedcommand solution does not work?

Gerion

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