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

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

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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).

Gerion

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