This change implements the following features:

PORPHANS
  New numeric register: Defines number of lines following LP, PP,
  QP, IP or XP, which must be kept together, before any automatic
  page break.  If insufficient space remains on the current page, a
  page break is forced before the new paragraph begins.

HORPHANS
  New numeric register: Sets number of lines of following paragraph
  which must be kept with a heading, defined by NH or SH, before any
  automatic page break.  If insufficient space remains on the
  current page, a page break is forced before the heading.

GROWPS
  (Thanks to Joerg van den Hoff, for this idea).

  New numeric register: Sets the first level of heading (set with
  NH), which will keep the same point size as body text; e.g. if
  GROWPS is set to 3, .NH 3, .NH 4, ... will produce headings at the
  point size specified by \n[PS], but .NH 2 and .NH 1 will have
  progressively larger point sizes, determined by \n[PSINCR] (see
  below).

PSINCR
  New numeric register: Sets the point size increment for each level
  of heading, (set with NH), below the threshold level set by
  GROWPS; e.g. if \n[PS] = 10, \n[GROWPS] = 3 and \n[PSINCR] = 2.0p,
  then .NH 1 will produce 14pt headings, .NH 2 will produce 12pt,
  and all other levels will remain at 10pt, (because \n[PS] = 10).

SH
  Existing macro now accepts a numeric argument, to make heading
  size match that of NH with same argument value, when the
  GROWPS/PSINCR feature is enabled.

SN-DOT
  New string, set by NH macro, replaces the existing (undocumented)
  use of SN, to represent the assigned section number.

SN-NO-DOT
  New string, set by NH macro, represents the assigned section
  number, but omits the terminal period (periods at intermediate
  levels are retained).

SN
  String set by NH macro, originally undocumented, now implemented
  as an alias for SN-DOT (which reproduces original behaviour).

* tmac/s.tmac (PORPHANS): New register.
(par*start): Use it.
(HORPHANS, GROWPS, PSINCR): New registers.
(SH-NO-TAG, @SH): Use them.
(@NH): Improved.


* NEWS, doc/groff.texinfo, tmac/groff_ms.man: Document the deletion
of `Ds' and `De' macros.

1 files changed, 8 insertions, 3 deletions

diff --git a/tmac/groff_ms.man b/tmac/groff_ms.man
index 8ce4bb2b..f18150a9 100644
--- a/tmac/groff_ms.man
+++ b/tmac/groff_ms.man
@@ -629,12 +629,17 @@ The macros
 .B Ds
 and
 .B De
-are aliases for
+were formerly provided as aliases for
 .B DS
 and
 .BR DE ,
-respectively.
-.
+respectively, but they have been removed, and should no longer be used.
+X11 documents which actually use
+.B Ds
+and
+.B De
+always load a specific macro file from the X11 distribution (macros.t)
+which provides proper definitions for the two macros.
 .PP
 To
 .I keep