Re: Problem with Filter Module in latent context beta

[Hans Hagen <j.hagen@xs4all.nl>]

On 4/17/2018 12:01 AM, Aditya Mahajan wrote:
> All features of the filter and vim modules work with the latest beta, 
> except for one final bug: leading spaces are stripped from the buffer.
> 
> \starttext
> 
> \startbuffer[test]
>      Leading spaces
> \stopbuffer
> 
> \savebuffer[file=test-temp.tmp, prefix=no, list=test]
> 
> \stoptext
> 
> The leading spaces are stripped before the buffer is saved to the file 
> temp.tmp. Is it possible for the leading space NOT to be stripped? (If 
> not, I'll just document this as a feature :-).

\samplefile{ward}
\startnarrower
     \samplefile{ward}
     \startbuffer[test]
         Leading spaces
           And some more
     \stopbuffer
     \typebuffer[test]
\stopnarrower
\samplefile{ward}

\startbuffer[test]
     Leading spaces
         And some more
\stopbuffer
\typebuffer[test]

it is actually a feature to align the left edge relative to the least 
indented so that we can use them inside other constructs

Now, as you're not afraid of low level code:

\unprotect

\unexpanded\def\StartAditya
   {\buff_pickup
     {Aditya}%
     {StartAditya}%
     {StopAditya}%
     {}%
     {\savebuffer[file=test-temp.tmp,prefix=no,list=Aditya]}%
     \zerocount}

\unexpanded\def\StopAditya
   {}

\protect

\StartAditya
     Leading spaces
         And some more
\StopAditya

(1)

\typebuffer[Aditya]

(2)

\typefile{test-temp.tmp}

Does what you want but of course it's sort of ugly for a module to do 
that. What we can do is this which is still ugly but picking up verbatim 
is always ugly:

\unprotect

\def\buff_start_indeed#1#2#3#4%
   {\edef\p_strip{\namedbufferparameter{#1}\c!strip}%
 
\normalexpanded{\buff_pickup{#2}{#3}{#4}{}{\buff_stop{#4}}\ifx\p_strip\v!no\zerocount\else\plusone\fi}}

\protect

\definebuffer[Aditya][strip=no]

\startAditya
     Leading spaces
         And some more
             And even more
\stopAditya

\typeAditya

But then we need Wolfgang to double check if this extension has side 
effects elsewhere.

Hans

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