New subject: How to check if buffer or block has content

2 Aug 2021

      That's great, I wikified a Note for testing if a buffer exists or has content (using the \getbuffer[…] approach for the moment). 

If I was asked, I'd opt for \doifelseemptybuffer (doifemptyelse?) since one could think of similar commands that test for empty "objects".

Is there an option for testing blocks? (I actually use blocks quite frequently …) 

I just realized they are probably handled very differently during the typesetting. Basically I would just need to test if during the first run any of \beginBLOCK … \endBLOCK was invoked (but if one gets a test for some content in-between that's even better).

As an alternative solution, is there a way to add content to buffers? Unfortunately, I can't use \getbuffer[first,second], but \startbuffer[first][add=yes] … \stopbuffer would be nice.

Thanks!

Benjamin
...
On Aug 2, 2021, at 17:17, ntg-context-request@ntg.nl wrote:
\starttext
\startbuffer[test]
test
\stopbuffer
\doifelsebuffer{test} {YES} {NOP}
\permanent\protected\def\doifelsebuffercontent#1%
 {\doifelse{\luaexpr{(string.strip(buffers.getcontent("#1")) ~= "" and "yes")}}{yes}}
\startbuffer[test]
\stopbuffer
\doifelsebuffercontent{test} {YES} {NOP}
\startbuffer[test]
\stopbuffer
\doifelsebuffercontent{test} {YES} {NOP}
\stoptext

Re: [NTG-context] How to check if buffer or block has content

Benjamin Buchmuller

Hans Hagen

Hans Hagen

Benjamin Buchmuller

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