[NTG-context] setups issue

[NTG-context] setups issue

[jbf]

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I have the following command which I am using as part of 
\setuphead[chapter]:

\define[2]\MyChapterCommand%

{\framed[frame=on,bottomframe=on,leftframe=off,rightframe=off,topframe=off,align=middle]

{\vbox{\headtext{chapter} #1 \blank #2}}}

Together with the rest of the \setuphead[chapter] elements, it functions 
correctly, as indeed it should

But as soon as I place the full description of the chapter head between 
a \startsetups.... \stopsetups (since I wanted to create a few different 
chapter possibilities as setups to choose from), the hashes in the above 
command cause an error.

The error reads: You meant to type ## instead of # right?..... fatal 
error...

Why is this?

Julian


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[NTG-context] Re: setups issue

[Wolfgang Schuster]

Am 12.05.2025 um 05:26 schrieb jbf:
> I have the following command which I am using as part of 
> \setuphead[chapter]:
> 
> \define[2]\MyChapterCommand%
> 
> {\framed[frame=on,bottomframe=on,leftframe=off,rightframe=off,topframe=off,align=middle]
> 
> {\vbox{\headtext{chapter} #1 \blank #2}}}
> 
> Together with the rest of the \setuphead[chapter] elements, it functions 
> correctly, as indeed it should
> 
> But as soon as I place the full description of the chapter head between 
> a \startsetups.... \stopsetups (since I wanted to create a few different 
> chapter possibilities as setups to choose from), the hashes in the above 
> command cause an error.
> 
> The error reads: You meant to type ## instead of # right?..... fatal 
> error...
> 
> Why is this?

The setups environment is a fancy version of \def with additional 
features, e.g. ignoring line endings. When you create an environment with

\startsetups A
...
\stopsetups

the internal structure is

\def\xxxA{...}

with xxx as internal prefix for the macro name.


When you create a command within the argument of another command the # 
of the argument of the inner command have to be doubled, as indicated in 
the error message, i.e.

\define[1]\Command{... #1 ...}

becomes

\def\OuterCommand{\define[1]\InnerCommand{... ##1 ...}}



Below are two example once with nested definitions and once with a 
setups environment.

%% begin example - nested definitions
\def\RedefineStrong{\define[1]\Strong{{\it ##1}}}

\define[1]\Strong{{\bf #1}}

\starttext

word \Strong{word} word

\RedefineStrong

word \Strong{word} word

\stoptext
%% end example

%% begin example - setups environment
\startsetups italic
   \define[1]\Strong{{\it ##1}}
\stopsetups

\define[1]\Strong{{\bf #1}}

\starttext

word \Strong{word} word

\setups[italic]

word \Strong{word} word

\stoptext
%% end example


Wolfgang

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[NTG-context] Re: setups issue

[jbf]

Thank you for that very clear explanation.

Julian

On 13/5/25 02:12, Wolfgang Schuster wrote:
> The setups environment is a fancy version of \def 
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[NTG-context] Re: setups issue

[Wolfgang Schuster]

Am 12.05.2025 um 23:22 schrieb jbf:
> Thank you for that very clear explanation.

Below is another \setups feature.

\startsetups strong
   \ifempty{#1}
     \bgroup \tttf
       [empty]
     \egroup
   \else
     \bgroup \bf
       #1
     \egroup
   \fi
\stopsetups

\starttext

word \setup{strong} word

word \setupwithargument{strong}{word} word

\stoptext

Wolfgang

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