Thanx Henri for answer. Maybe I have been explaining wrong my problem. I would need a variant without a parameter and concurrently without braces. Command without braces swallows the break of the paragraph. \def\Command#1% {\expdoifelse{#1}{}{100}{#1}} \starttext 1. \Command{5} % OK 2. \Command % OK 3. As You see, Command without braces swallows the break of the paragraph. 1. \dorecurse{\Command{5}}{\recurselevel\crlf} % not working 2. \dorecurse{\Command{}}{\recurselevel\crlf} % not working \stoptext Jaroslav Hajtmar Dne 27.06.17 13:05, ntg-context za uživatele Henri Menke napsal(a): On Tue, 2017-06-27 at 08:58 +0000, Jaroslav Hajtmar wrote: > Hello ConTeXist. > I'm not able to solve a macros problem with one optional argument. I need the macro to return a > value that can be used as a dorecurse loop parameter. > Is there possibility create macro with optional parameter and parameter is concurrently inside in > braces? (in nonsquare brackets)? > I've tried to experiment with examples from the wiki, but I'm not clear about it. > > Thanx for help. > Jaroslav Hajtmar > > Here is minimal example: > > \def\DoCommand[#1]% > {\iffirstargument#1\else100\fi} > > \def\Command% > {\dosingleargument\DoCommand} > > %\def\DoAnotherCommand{#1}% > % {\iffirstargument#1\else100\fi} > > %\def\AnotherCommand% > % {\dosingleargument\DoAnotherCommand} > > \starttext > > 1. \Command[5] % OK > > 2. \Command % OK > > > > > %1. \dorecurse{\Command[5]}{\recurselevel\crlf} % not working > > %2. \dorecurse{\Command}{\recurselevel\crlf} % not working The first argument to \dorecurse has to expand to a number. Therefore it has to be fully- expandable. Scanning for optional brackets is never expandable. You have to do it this way: \def\Command#1% {\expdoifelse{#1}{}{100}{#1}} \starttext 1. \Command{5} % OK 2. \Command{} % OK 1. \dorecurse{\Command{5}}{\recurselevel\crlf} % not working 2. \dorecurse{\Command{}}{\recurselevel\crlf} % not working \stoptext > \stoptext > ___________________________________________________________________________________ > If your question is of interest to others as well, please add an entry to the Wiki! > > maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context > webpage : http://www.pragma-ade.nl / http://context.aanhet.net > archive : https://bitbucket.org/phg/context-mirror/commits/ > wiki : http://contextgarden.net > ___________________________________________________________________________________ ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___________________________________________________________________________________