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

25 Jun 2024

      Am Dienstag, 25. Juni 2024, 00:09:09 MESZ schrieb Wolfgang Schuster:
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Gerion Entrup schrieb am 24.06.2024 um 23:57:
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Am Montag, 24. Juni 2024, 21:20:19 MESZ schrieb Aditya Mahajan:
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On Mon, 24 Jun 2024, Gerion Entrup wrote:
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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