Drop support for zic -y, Rule TYPEs, pacificnew

These features have not been used by the distribution since release
2000f, were previously deprecated in 2015f, and zic has warned against
their use since 2017c.

* zic.c (struct rule): Remove r_yrtype field.
(main): Ignore obsolete -y option.
(rulesub): Error on nontrivial use of the former Rule TYPE field.
(stringzone): Remove year type check.
(outzone): Stop considering the former TYPE field when applying Rules.
(shellquote, yearistype): Remove now-disused code.
* zic.8: Rename TYPE field of Rule lines to "-" in examples and in the
input format specification; fully deprecate this field for backwards
compatibiilty only.
* africa, antarctica, asia, australasia, backzone, europe, northamerica,
southamerica, zoneinfo2tdf.pl: Rename TYPE field in Rule line header
comments to "-".
* pacificnew, yearistype.sh: Remove obsolete files.
* tz-how-to.html: Rename TYPE field of Rule lines to "-" in examples;
expand explanation of FROM and TO fields so that the reworked
description of the deprecated field makes sense in context.
* Makefile (YEARISTYPE, yearistype): Remove.
(DATA, all, INSTALLARGS, INSTALL_DATA_DEPS, check_character_set,
clean_misc): Remove dependencies on yearistype, yearistype.sh, and
YEARISTYPE.
(TDATA_TO_CHECK, VERSION_DEPS): Remove dependencies on obsolete files.
* NEWS: Document this.

Makefile

@@ -169,9 +169,6 @@ TZDATA_TEXT=	leapseconds tzdata.zi
 
 # For backward-compatibility links for old zone names, use
 #	BACKWARD=	backward
-# If you also want the link US/Pacific-New, even though it is confusing
-# and is planned to be removed from the database eventually, use
-#	BACKWARD=	backward pacificnew
 # To omit these links, use
 #	BACKWARD=
 
@@ -189,10 +186,6 @@ PACKRATDATA=
 
 UTF8_LOCALE=	en_US.utf8
 
-# Since "." may not be in PATH...
-
-YEARISTYPE=	./yearistype
-
 # Non-default libraries needed to link.
 LDLIBS=
 
@@ -534,15 +527,15 @@ PRIMARY_YDATA=	africa antarctica asia australasia \
 		europe northamerica southamerica
 YDATA=		$(PRIMARY_YDATA) etcetera
 NDATA=		factory
-TDATA_TO_CHECK=	$(YDATA) $(NDATA) backward pacificnew
+TDATA_TO_CHECK=	$(YDATA) $(NDATA) backward
 TDATA=		$(YDATA) $(NDATA) $(BACKWARD)
 ZONETABLES=	zone1970.tab zone.tab
 TABDATA=	iso3166.tab $(TZDATA_TEXT) $(ZONETABLES)
 LEAP_DEPS=	leapseconds.awk leap-seconds.list
 TZDATA_ZI_DEPS=	ziguard.awk zishrink.awk version $(TDATA) $(PACKRATDATA)
 DSTDATA_ZI_DEPS= ziguard.awk $(TDATA) $(PACKRATDATA)
 DATA=		$(TDATA_TO_CHECK) backzone iso3166.tab leap-seconds.list \
-			leapseconds yearistype.sh $(ZONETABLES)
+			leapseconds $(ZONETABLES)
 AWK_SCRIPTS=	checklinks.awk checktab.awk leapseconds.awk \
 			ziguard.awk zishrink.awk
 MISC=		$(AWK_SCRIPTS) zoneinfo2tdf.pl
@@ -568,12 +561,10 @@ VERSION_DEPS= \
 		etcetera europe factory iso3166.tab \
 		leap-seconds.list leapseconds.awk localtime.c \
 		newctime.3 newstrftime.3 newtzset.3 northamerica \
-		pacificnew private.h \
-		southamerica strftime.c theory.html \
+		private.h southamerica strftime.c theory.html \
 		time2posix.3 tz-art.html tz-how-to.html tz-link.html \
 		tzfile.5 tzfile.h tzselect.8 tzselect.ksh \
-		workman.sh yearistype.sh \
-		zdump.8 zdump.c zic.8 zic.c \
+		workman.sh zdump.8 zdump.c zic.8 zic.c \
 		ziguard.awk zishrink.awk \
 		zone.tab zone1970.tab zoneinfo2tdf.pl
 
@@ -582,7 +573,7 @@ VERSION_DEPS= \
 
 SHELL=		/bin/sh
 
-all:		tzselect yearistype zic zdump libtz.a $(TABDATA) \
+all:		tzselect zic zdump libtz.a $(TABDATA) \
 		  vanguard.zi main.zi rearguard.zi
 
 ALL:		all date $(ENCHILADA)
@@ -652,10 +643,6 @@ zdump:		$(TZDOBJS)
 zic:		$(TZCOBJS)
 		$(CC) -o $@ $(CFLAGS) $(LDFLAGS) $(TZCOBJS) $(LDLIBS)
 
-yearistype:	yearistype.sh
-		cp yearistype.sh yearistype
-		chmod +x yearistype
-
 leapseconds:	$(LEAP_DEPS)
 		$(AWK) -v EXPIRES_LINE=$(EXPIRES_LINE) \
 		  -f leapseconds.awk leap-seconds.list >$@.out
@@ -670,10 +657,9 @@ INSTALLARGS = \
  PACKRATDATA='$(PACKRATDATA)' \
  TZDEFAULT='$(TZDEFAULT)' \
  TZDIR='$(TZDIR)' \
- YEARISTYPE='$(YEARISTYPE)' \
  ZIC='$(ZIC)'
 
-INSTALL_DATA_DEPS = zic leapseconds yearistype tzdata.zi
+INSTALL_DATA_DEPS = zic leapseconds tzdata.zi
 
 # 'make install_data' installs one set of TZif files.
 install_data: $(INSTALL_DATA_DEPS)
@@ -788,7 +774,7 @@ check_character_set: $(ENCHILADA)
 		! grep -Env $(SAFE_LINE)'|^UNUSUAL_OK_'$(OK_CHAR)'*$$' \
 			Makefile && \
 		! grep -Env $(SAFE_SHARP_LINE) $(TDATA_TO_CHECK) backzone \
-			leapseconds yearistype.sh zone.tab && \
+			leapseconds zone.tab && \
 		! grep -Env $(OK_LINE) $(ENCHILADA); \
 	}
 	touch $@
@@ -878,7 +864,7 @@ clean_misc:
 		rm -fr check_*.dir
 		rm -f *.o *.out $(TIME_T_ALTERNATIVES) \
 		  check_* core typecheck_* \
-		  date tzselect version.h zdump zic yearistype libtz.a
+		  date tzselect version.h zdump zic libtz.a
 clean:		clean_misc
 		rm -fr *.dir tzdb-*/
 		rm -f *.zi $(TZS_NEW)

NEWS

@@ -7,6 +7,7 @@ Unreleased, experimental changes
     Canada's Yukon changes to -07 on 2020-11-01, not 2020-03-08.
     Macquarie Island has stayed in sync with Tasmania since 2011.
     Casey, Antarctica is at +08 in summer and +11 in winter.
+    zic no longer supports -y, nor the TYPE field of Rules.
 
   Changes to future timestamps
 
@@ -45,6 +46,12 @@ Unreleased, experimental changes
 
   Changes to code
 
+    Support for zic's long-obsolete '-y YEARISTYPE' option has been
+    removed and, with it, so has support for the TYPE field in Rule
+    lines, which is now reserved for compatibility with earlier zic.
+    These features were previously deprecated in release 2015f.
+    (Thanks to Tim Parenti.)
+
     zic now defaults to '-b slim' instead of to '-b fat'.
 
     zic's new '-l -' and '-p -' options uninstall any existing
@@ -60,8 +67,8 @@ Unreleased, experimental changes
 
   Changes to documentation and commentary
 
-    The long-obsolete file systemv has been removed from the
-    distribution.  (Thanks to Tim Parenti.)
+    The long-obsolete files pacificnew, systemv, and yearistype.sh have
+    been removed from the distribution.  (Thanks to Tim Parenti.)
 
 
 Release 2020a - 2020-04-23 16:03:47 -0700

africa

@@ -64,7 +64,7 @@
 # Corrections are welcome.
 
 # Algeria
-# Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
+# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Algeria	1916	only	-	Jun	14	23:00s	1:00	S
 Rule	Algeria	1916	1919	-	Oct	Sun>=1	23:00s	0	-
 Rule	Algeria	1917	only	-	Mar	24	23:00s	1:00	S
@@ -175,7 +175,7 @@ Link Africa/Abidjan Atlantic/St_Helena	# St Helena
 # Egypt was mean noon at the Great Pyramid, 2:04:30.5, but apparently this
 # did not apply to Cairo, Alexandria, or Port Said.
 
-# Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
+# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Egypt	1940	only	-	Jul	15	0:00	1:00	S
 Rule	Egypt	1940	only	-	Oct	 1	0:00	0	-
 Rule	Egypt	1941	only	-	Apr	15	0:00	1:00	S
@@ -410,7 +410,7 @@ Zone	Africa/Cairo	2:05:09 -	LMT	1900 Oct
 # now Ghana observed different DST regimes in different years.  For
 # lack of better info, use Shanks except treat the minus sign as a
 # typo, and assume DST started in 1920 not 1936.
-# Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
+# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Ghana	1920	1942	-	Sep	 1	0:00	0:20	-
 Rule	Ghana	1920	1942	-	Dec	31	0:00	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
@@ -500,7 +500,7 @@ Zone	Africa/Monrovia	-0:43:08 -	LMT	1882
 # From Paul Eggert (2013-10-25):
 # For now, assume they're reverting to the pre-2012 rules of permanent UT +02.
 
-# Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
+# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Libya	1951	only	-	Oct	14	2:00	1:00	S
 Rule	Libya	1952	only	-	Jan	 1	0:00	0	-
 Rule	Libya	1953	only	-	Oct	 9	2:00	1:00	S
@@ -623,7 +623,7 @@ Zone	Africa/Tripoli	0:52:44 -	LMT	1920
 # "The trial ended on March 29, 2009, when the clocks moved back by one hour
 # at 2am (or 02:00) local time..."
 
-# Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
+# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule Mauritius	1982	only	-	Oct	10	0:00	1:00	-
 Rule Mauritius	1983	only	-	Mar	21	0:00	0	-
 Rule Mauritius	2008	only	-	Oct	lastSun	2:00	1:00	-
@@ -912,7 +912,7 @@ Zone Indian/Mauritius	3:50:00 -	LMT	1907 # Port Louis
 #         (car (cdr (cdr b))) (calendar-month-name (car b) t) (car (cdr b)))))
 #     (setq islamic-year (+ 1 islamic-year))))
 
-# RULE	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
+# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Morocco	1939	only	-	Sep	12	 0:00	1:00	-
 Rule	Morocco	1939	only	-	Nov	19	 0:00	0	-
 Rule	Morocco	1940	only	-	Feb	25	 0:00	1:00	-
@@ -1192,7 +1192,7 @@ Link Africa/Maputo Africa/Lusaka	# Zambia
 # Use plain "WAT" and "CAT" for the time zone abbreviations, to be compatible
 # with Namibia's neighbors.
 
-# RULE	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
+# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 # Vanguard section, for zic and other parsers that support negative DST.
 Rule	Namibia	1994	only	-	Mar	21	0:00	-1:00	WAT
 Rule	Namibia	1994	2017	-	Sep	Sun>=1	2:00	0	CAT
@@ -1315,7 +1315,7 @@ Zone	Indian/Mahe	3:41:48 -	LMT	1906 Jun # Victoria
 # See Africa/Nairobi.
 
 # South Africa
-# Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
+# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	SA	1942	1943	-	Sep	Sun>=15	2:00	1:00	-
 Rule	SA	1943	1944	-	Mar	Sun>=15	2:00	0	-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
@@ -1348,7 +1348,7 @@ Link Africa/Johannesburg Africa/Mbabane    # Eswatini
 # Abdalla of NTC, archived at:
 # https://mm.icann.org/pipermail/tz/2017-October/025333.html
 
-# Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
+# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Sudan	1970	only	-	May	 1	0:00	1:00	S
 Rule	Sudan	1970	1985	-	Oct	15	0:00	0	-
 Rule	Sudan	1971	only	-	Apr	30	0:00	1:00	S
@@ -1436,7 +1436,7 @@ Zone	Africa/Juba	2:06:28 -	LMT	1931
 # http://www.almadenahnews.com/newss/news.php?c=118&id=38036
 # http://www.worldtimezone.com/dst_news/dst_news_tunis02.html
 
-# Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
+# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 Rule	Tunisia	1939	only	-	Apr	15	23:00s	1:00	S
 Rule	Tunisia	1939	only	-	Nov	18	23:00s	0	-
 Rule	Tunisia	1940	only	-	Feb	25	23:00s	1:00	S

antarctica

@@ -239,7 +239,7 @@ Zone Antarctica/Syowa	0	-	-00	1957 Jan 29
 # suggested by Bengt-Inge Larsson comment them out for now, and approximate
 # with only UTC and CEST.  Uncomment them when 2014b is more prevalent.
 #
-# Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
+# Rule	NAME	FROM	TO	-	IN	ON	AT	SAVE	LETTER/S
 #Rule	Troll	2005	max	-	Mar	 1	1:00u	1:00	+01
 Rule	Troll	2005	max	-	Mar	lastSun	1:00u	2:00	+02
 #Rule	Troll	2005	max	-	Oct	lastSun	1:00u	1:00	+01