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, 27 insertions, 2 deletions

diff --git a/tmac/groff_ms.man b/tmac/groff_ms.man
index a9e0aee4..331c7cce 100644
--- a/tmac/groff_ms.man
+++ b/tmac/groff_ms.man
@@ -1,6 +1,6 @@
 '\" t
 .ig
-Copyright (C) 1989-1995, 2001, 2002, 2003, 2004, 2005, 2006
+Copyright (C) 1989-1995, 2001, 2002, 2003, 2004, 2005, 2006, 2007
   Free Software Foundation, Inc.
 
 Permission is granted to make and distribute verbatim copies of
@@ -1298,7 +1298,32 @@ is to detect and report errors,
 rather than silently to ignore them.
 .
 .IP \(bu
-Bell Labs localisms are not implemented.
+Some Bell Labs localisms are not implemented by default.
+However, by giving the command-line option
+.B "-r\ bell=1"
+you can enable implementations of the archaic Bell Labs macros 
+.BR SC ,
+.BR UC ,
+.BR P1 ,
+and 
+.BR P2 .
+These are not enabled by default because (a)\~they were not documented, 
+in the original 
+.IR "ms manual" ,
+and (b)\~the
+.B P1
+and 
+.B UC
+macros both collide with different macros in the Berkeley version of
+.IR ms . 
+The 
+.B "-r\ bell=1"
+emulations are sufficient to give back the 1976 Kernighan\~& Cherry paper
+.I "Typsetting Mathematics \(en 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.
 .
 .IP \(bu
 Berkeley localisms, in particular the