Add some Bell labs extensions to the -ms macros.

* tmac/s.tmac (.SC, .UC, .P1, .P2) [bell]: New macros.

* tmac/groff_ms.man, doc/groff.texinfo, NEWS: Document `-r bell'.

1 files changed, 16 insertions, 0 deletions

diff --git a/doc/groff.texinfo b/doc/groff.texinfo
index 9bbc317e..1be1473f 100644
--- a/doc/groff.texinfo
+++ b/doc/groff.texinfo
@@ -4411,6 +4411,22 @@ Cover sheet information
 A cover sheet macro
 @end table
 
+Emulations of a few ancient Bell Labs macros can be re-enabled with
+the @code{groff} command-line option @w{@samp{-r bell=1}}.  They are
+@code{SC}, @code{UC}, @code{P1}, and @code{P2}.
+
+These are not enabled by default because (a)@tie{}they were not documented,
+in the original @code{ms} manual, and (b)@tie{}the @code{P1} and @code{UC}
+macros collide with different macros with the same names in the
+Berkeley version of @code{ms}.
+
+These @code{groff} emulations are sufficient to give back the
+1976 Kernighan@tie{}& Cherry paper @cite{Typsetting Mathematics -- User's
+Guide} its section headings, and restore some text that had gone
+missing as arguments of undefined macros.  No warranty express or
+implied is given as to how well the typographic details these produce
+match the original Bell Labs macros.
+
 @c ---------------------------------------------------------------------
 
 @node Additional ms Macros,  , Missing ms Macros, Differences from AT&T ms