[groff] 01/01: groff_man.7: Update historical information.

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit 5bad425a69332b4773338e29bf50d8812dc25f25
Author: G. Branden Robinson <address@hidden>
Date:   Fri Sep 6 20:48:35 2019 +1000

    groff_man.7: Update historical information.
    
    Flesh out History subsection per some archeology on minnie.tuhs.org.
    
    Also stop referring to extensions as "GNU extensions"; as Doug McIlroy
    pointed out on the groff mailing list, at least some of them (.EX/.EE)
    did not originate with GNU.
---
 tmac/groff_man.7.man | 36 ++++++++++++++++++++++++++++--------
 1 file changed, 28 insertions(+), 8 deletions(-)

diff --git a/tmac/groff_man.7.man b/tmac/groff_man.7.man
index 9a35185..53e8647 100644
--- a/tmac/groff_man.7.man
+++ b/tmac/groff_man.7.man
@@ -2166,15 +2166,11 @@ can be:
 .SS "History"
 .\" ====================================================================
 .
-According to its own
-.IR man (7)
-page,
-Version 7 Unix (1979) supported all of the macros described in this page
-not listed as GNU extensions,
-except
+Version\~7 Unix (1979) supported all of the macros described in this
+page not listed as extensions, except
 .BR .P ,
 .BR .SB ,
-.BR .SS ,
+.\" .SS was implemented in tmac.an but not documented in man(7).
 and the deprecated
 .BR .AT ,
 .BR .BT ,
@@ -2188,6 +2184,30 @@ and
 .BR S ;
 no number registers were documented.
 .
+.B .UC
+appeared in 3BSD (1980) and
+.B .P
+in AT&T Unix System\~III (1980).
+.
+4BSD (1980) added
+.\" undocumented .VS and .VE macros to mark regions with 12-point box
+.\" rules (\[br]) as margin characters, as well as...
+.B lq
+and
+.B rq
+string registers.
+.
+.
+4.3BSD (1986) added
+.\" undocumented .DS and .DE macros for "displays", which are .RS/.RE
+.\" wrappers with filling disabled and vertical space of 1v before and
+.\" .5v after, as well as...
+.B .AT
+and
+AT&T's
+.BR .P .
+.\" TODO: Determine provenance of .BT, .PT, .SB, \*(HF, and \*(Tm.
+.
 .
 .\" ====================================================================
 .SH OPTIONS
@@ -2423,7 +2443,7 @@ Most
 .I man
 macros are contained in this file.
 .
-It also loads the GNU extensions from
+It also loads the extensions from
 .I an\-ext.tmac
 (see below).
 .