[Groff] Optional backward compatibility to Bell Labs

[Eric S. Raymond]

--- s.tmac.~1.25.~      2005-05-26 17:02:01.000000000 -0400
+++ s.tmac      2007-01-31 23:03:18.000000000 -0500
@@ -2073,4 +2073,31 @@
 .   \}
 ..
 address@hidden
+.\" ****************************
+.\" ******** module bell ********
+.\" ****************************
+.\" Emulate Bell Labs localisms by setting -r bell=1 on the command line.
+.\" They're not enabled by default because (a) they're not documented, and
+.\" (b) the .P1 macro collides with a different one in the Berkeley version. 
+.\" What's done here is sufficient to give back the Guide to EQN (1976) its
+.\" section headings and restore some text that had gone missing as macro
+.\" arguments; no warranty express or implied is given as to how well the
+.\" typographic details these produce match the original Bell Labs macros.
+.if \n[bell] \{\
+.de SC
+.NH 
+\\$*
+..
+.de UC
+\f(CW\\$*\fP
+..
+.de P1
+.DS L
+ft CW
+..
+.de P2
+.ft
+.DE
+..
+.\}
 .\" Make sure that no blank lines creep in at the end of this file.
-- 
                <a href="http://www.catb.org/~esr/";>Eric S. Raymond</a>