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[Groff] No-space mode in diversions

From: Tadziu Hoffmann
Subject: [Groff] No-space mode in diversions
Date: Thu, 3 May 2001 08:29:05 +0200


The troff user's manual states that no-space mode is associated
with the current diversion, and Unix troff behaves accordingly.
GNU troff currently implements no-space mode only for the
top-level diversion.  Anybody interested in a quick fix?

Anyhow, here's some troff input for testing:
(test with nroff -Ttn300 or groff -Tascii)
.pl 20v
.vs 2v
.di xx
.sp 3v
.sp 3v
(Of course it doesn't work in the current version of groff because
the code to handle it is not there.  Unix nroff shows interesting
behavior: if you remove the `.br' after `bar' in this sample code,
it behaves as if the `.ns' were completely ineffective.  Probably
because `.sp' generates a break, causing `bar' to be output, which
turns no-space mode off, after which `.sp' is allowed to space.
Is this interpretation correct?  Does it make sense to act this
way?  I think it would have been nicer if `.sp' caused a break,
but threw away its arguments while still in no-space mode.)

Also, I think we should have a number register to query
no-space mode.  I suggest `.q' (in analogy to `.u') to give
`1' in no-space mode and `0' in (default) normal mode.


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