I used  \doifmode and friends for selection of mode dependent code.

dr. Hans van der Meer


> On 1 Mar 2019, at 01:24, Hans Hagen <j.hagen@xs4all.nl> wrote:
> 
> On 2/28/2019 11:29 AM, Procházka Lukáš Ing. wrote:
>> Hello,
>> I'm struggling with using modes to make a part of the text conditional.
>> Here is my code:
>> ----
>> \def\b#1{\startmode[#1]}
>> \def\e{\stopmode}
>> % \enablemode[100] % For optional usage
>> \starttext
>>   A
>>   \b{100} % Should be start of some conditional text from here ...
>>     B
>>   \e % ... to here
>> \stoptext
>> ----
>> Compilation fails with:
>> "
>> tex error       > tex error on line 0 in file : ! Emergency stop
>> <*> cont-yes.mkiv
>> <empty file>
>> *** (job aborted, no legal \end found)
>> "
>> How to make the sample work?
> modes are like buffers ... don't wrap them in macros
> 
> (using names like \b \e is a bad idea anyway)
> 
> Hans
> 
> 
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