[man,mdoc,me]: Revise hyphenation localization.

* tmac/an.tmac (an*reset-hyphenation-mode): New macro sets the
  hyphenation mode appropriate to the locale depending on the values of
  `cR` (continuous rendering mode) and `HY` (hyphenation enablement);
  the latter is now interpreted as a Boolean.  Define new register
  `an*hyphenation-mode` reflecting these conditions.

  (TH): Call the foregoing instead of invoking `hy` request.

  (MR): Restore hyphenation mode to `an*hyphenation-mode`.

  (initializtion): Simplify; if not defined, set `HY` to 1.

* tmac/e.tmac (ld): Set the hyphenation mode here instead of in
  initialization (which already calls this macro).  Set the mode to 6
  for the benefit of anyone borrowing our me(7) changes, but then
  immediately change to the mode determinated by the localization file.

* tmac/mdoc/doc-common (doc-hyphen-flags): Set an hyphenation mode
  appropriate to the locale depending on the values of `cR` and `HY`.
* tmac/mdoc/doc-ditroff:
* tmac/mdoc/doc-nroff: Simplify initialization; if not defined, set `HY`
  to 1.

* tmac/cs.tmac:
* tmac/de.tmac:
* tmac/en.tmac:
* tmac/fr.tmac:
* tmac/it.tmac:
* tmac/sv.tmac: Before switching locales, set a flag if troublesome bit
  2 of the hyphenation mode is set so that we can preserve it.  Shift
  man(7) and me(7) logic to follow setup of the new hyphenation mode;
  for the former, call the new `an*reset-hyphenation-mode`.

* tmac/groff_man.7.man.in:
* tmac/groff_mdoc.7.man: Document updated meaning of `HY` register.

* NEWS: Add item noting change of man(7) `HY`'s meaning.  Update
  existing item regarding mdoc(7)'s support for it (groff 1.22.4 mdoc(7)
  didn't recognize the register at all).

Fixes <https://savannah.gnu.org/bugs/?61734> (for real this time?).

1 files changed, 31 insertions, 21 deletions

diff --git a/tmac/sv.tmac b/tmac/sv.tmac
index 3e2102272..f2fbef401 100644
--- a/tmac/sv.tmac
+++ b/tmac/sv.tmac
@@ -1,6 +1,6 @@
 .\" Swedish localization for groff
 .\"
-.\" Copyright (C) 2006-2020 Free Software Foundation, Inc.
+.\" Copyright (C) 2006-2022 Free Software Foundation, Inc.
 .\"   Written by Werner Lemberg (wl@gnu.org)
 .\"
 .\" This file is part of groff.
@@ -25,6 +25,14 @@
 .cp 0
 .
 .
+.\" If changing from an existing locale, we need to preserve the state
+.\" of the "suppress hyphenation before a page location trap" bit.
+.nr locale*use-trap-hyphenation-mode 0
+.if d locale \
+.  if \n[.hy]=\n[\*[locale]*hyphenation-mode-trap] \
+.    nr locale*use-trap-hyphenation-mode 1
+.
+.
 .ds locale swedish\"
 .
 .
@@ -114,13 +122,6 @@
 .mso trans.tmac
 .
 .
-.\" man package
-.if d an \{\
-.	ie \n[cR] .nr HY 32
-.	el        .nr HY 34
-.\}
-.
-.
 .\" ms package
 .if r GS \{\
 .	\" update the date
@@ -133,26 +134,23 @@
 .\" mm package -- additional Swedish localization is done in mse.tmac
 .
 .
-.\" me package
-.if d @R \{\
-.	ds _td_format \En(dy \E*(mo \En(y4
-.	ld
-.\}
-.
-.
 .\" Default encoding
 .mso latin1.tmac
 .
 .ss 12 0
 .
+.\" Set up hyphenation.
+.
 .\" Swedish hyphenation (\lefthyphenmin=1, \righthyphenmin=2)
-.\"
-.\" Hyphenation value 2 (bit 1) may already have been set by troffrc or
-.\" a macro package; preserve it.
-.ie (\n[.hy]%2=0 & (\n[.hy]%4)) \
-.	hy 34
+.nr \*[locale]*hyphenation-mode-base 32
+.nr \*[locale]*hyphenation-mode-trap 34
+.
+.ie \n[locale*use-trap-hyphenation-mode] \
+.  hy \n[\*[locale]*hyphenation-mode-trap]
 .el \
-.	hy 32
+.  hy \n[\*[locale]*hyphenation-mode-base]
+.
+.rr locale*use-trap-hyphenation-mode
 .
 .hcode å å  Å å
 .hcode ä ä  Ä ä
@@ -163,6 +161,18 @@
 .hpf hyphen.sv
 .
 .
+.\" man package
+.if d an \
+.	an*reset-hyphenation-mode
+.
+.
+.\" me package
+.if d @R \{\
+.	ds _td_format \En(dy \E*(mo \En(y4
+.	ld
+.\}
+.
+.
 .cp \n[*groff_sv_tmac_C]
 .do rr *groff_sv_tmac_C
 .