%% How can one remove blank lines at the start of a buffer so that %% commands that grab a buffer can be used in the same way as, for %% example, \startparagraph...\stopparagraph, which allow blank %% lines around the content? %% %% The problem appears when an optional argument is allowed but none %% is provided. Adding \relax does not help; adding empty brackets %% does. I see no way to distinguish between a buffer without %% leading blank lines and a buffer that was created when brackets %% are provided. %% %% \inlinebuffer handles the leading blank lines when there is %% nothing prepended, but I need to prepend. (It also handles the %% unwanted trailing line, but that is not an issue here). %% %% How can I unpack the buffer, apply the equivalent functions of %% ignorespaspaces and removeunwantedspaces to it, and repack it? %% The buffer may contain internal blank lines and macros, and %% those should be retained. Or, is there already a function to %% strip a buffer in the manner that string.strip does a string? \setupwhitespace[none] \setupindenting[none] \define\Mark{\color[middlegray]{\itb¿\ }} \define\First{nothing yet} \define\Arg{nothing yet} \setuplanguage[en][spacing=packed] \starttexdefinition unexpanded startBufTest \bgroup \dosingleempty\dostartBufTest \stoptexdefinition \starttexdefinition dostartBufTest [#SETUPS] \doifsomethingelse{#{SETUPS}} {\define\Arg{yes}} {\define\Arg{no}} \iffirstargument \define\First{yes} \else \define\First{no} \fi \relax \getrawparameters[BufTest][xx=yy,#SETUPS] \grabbufferdata[TestBuffer][startBufTest][stopBufTest] \stoptexdefinition \starttexdefinition stopBufTest \startparagraph \dontleavehmode\llap{\Mark}\inlinebuffer[TestBuffer] \ (first: \First, arg: \Arg) \stopparagraph \egroup \stoptexdefinition \starttext \startparagraph A starting paragraph. \stopparagraph \startBufTest Buffer without blank lines. \stopBufTest \startparagraph An intervening paragraph. \stopparagraph \startBufTest Buffer with blank lines. \stopBufTest \startparagraph An intervening paragraph. \stopparagraph \startBufTest\relax Buffer with \tex{relax}. \stopBufTest \startparagraph An intervening paragraph. \stopparagraph \startBufTest[] Buffer with \type{[]}. \stopBufTest \startparagraph An intervening paragraph. \stopparagraph \startBufTest[key=value] Buffer with \type{[key=value]}. \stopBufTest \startparagraph A closing paragraph. \stopparagraph \stoptext \stopmode %% -- %% Rik Kabel