How do I insert characters before \par

From: Rik Kabel <context@rik.users.panix.com>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: How do I insert characters before \par
Date: Fri, 31 Mar 2017 18:46:39 -0400	[thread overview]
Message-ID: <8a3aeff7-ba65-d963-e5be-7006b49bb8af@rik.users.panix.com> (raw)

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ConTeXters,

I am stymied trying to insert characters into a buffer, or failing that, 
to back up, removing the \par, and adding characters after the buffer is 
loaded.

The code I am working with reduces to this:

         1. % macros=mkvi engine=luajittex
         2. \starttexdefinition unexpanded startABC
         3.    \begingroup
         4.    \dosingleempty\dostartABC
         5. \stoptexdefinition
         6. \starttexdefinition dostartABC [#SETUPS]
         7.      \getrawparameters[ABC][inset=2em,#SETUPS]
         8.      \grabbufferdata[bu:ABC][startABC][stopABC]
         9. \stoptexdefinition
        10. \starttexdefinition stopABC
        11.      \setupnarrower[left=\ABCinset]
        12.      \startnarrower[left,right]
        13.        \startlines
        14.          (\,\inlinebuffer[bu:ABC]\,)
        15.        \stoplines
        16.      \stopnarrower
        17.    \endgroup
        18. \stoptexdefinition
        19. \starttext
        20. \startsubject[title={Test of ABC}]
        21. \startABC[inset=5em]
        22.    “Hope” is the thing with feathers\,—
        23.     That perches in the soul\,—
        24.     And sings the tune without the words\,—
        25.     And never stops\,—\,at all\,—
        26. \stopABC
        27. \startABC
        28. ABCDEFG
        29. \stopABC
        30. \stoptext

In line 14, I prefix the buffer with(\, but\,) ends up on another line, 
after the \par inserted at the end of the buffer. Inlining a second 
buffer which contains the closing  bits with (\inlinebuffer[a,b]) does 
the same.

Can somebody suggest a path?

---
Rik

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