[groff] 12/14: groff(7): `cu` & `ul` also use the "npl" concept.

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit 3724e9c978668a049eb8f32e7549187cca8e024b
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
AuthorDate: Fri Jan 6 09:58:46 2023 -0600

    groff(7): `cu` & `ul` also use the "npl" concept.
    
    Update to clarify behavior of these requests without arguments, and
    their use of the "productive input line" concept.
    
    Also tighten description of `uf` request.
---
 man/groff.7.man | 50 ++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 38 insertions(+), 12 deletions(-)

diff --git a/man/groff.7.man b/man/groff.7.man
index 2b9bab667..3b7e7a1f1 100644
--- a/man/groff.7.man
+++ b/man/groff.7.man
@@ -2641,11 +2641,21 @@ to
 ems with em
 .IR M .
 .
+.
 .TPx
-.REQ .cu "N"
-Continuous underline in nroff, like
-.request .ul
-in troff.
+.REQ .cu
+Continuously underline the output of the next productive input line.
+.
+.
+.TPx
+.REQ .cu npl
+Continuously underline the output of the next
+.I npl
+productive input lines.
+.
+If
+.IR npl =0,
+stop continuously underlining.
 .
 .
 .TPx
@@ -4126,20 +4136,36 @@ true and
 false.
 .
 .TPx
-.REQ .uf "font"
-Set underline font to
-.I font
-(to be switched to by
-.request .ul ).
+.REQ .uf font
+Set underline font used by
+.request .ul
+to
+.I font.
+.
 .
 .TPx
-.REQ .ul "N"
+.REQ .ul
 Underline
 (italicize in
 .I troff
 mode)
-.I N
-input lines.
+the output of the next productive input line.
+.
+.
+.TPx
+.REQ .ul npl
+Underline
+(italicize in
+.I troff
+mode)
+the output of the next
+.I npl
+productive input line.
+.
+If
+.IR npl =0,
+stop underlining.
+.
 .
 .TPx
 .REQ .unformat "diversion"