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

[Wolfgang Schuster <wolfgang.schuster.lists@gmail.com>]

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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

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