README, build: Generate list of formats

4 files changed, 25 insertions, 74 deletions

diff --git a/Makefile.am b/Makefile.am
index a82029d..0048520 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -59,7 +59,7 @@ bin_PROGRAMS = @
 EXTRA_@_DEPENDENCIES = version.c
 CLEANFILES = version.c
 CONFIG_CLEAN_FILES =
-EXTRA_DIST = autogen.sh
+EXTRA_DIST = autogen.sh FORMATS
 
 V_REDIR = $(V_REDIR_$(V))
 V_REDIR_ = $(V_REDIR_$(AM_DEFAULT_VERBOSITY))
@@ -84,6 +84,23 @@ if IN_GIT
 		1>>'$(distdir)/ChangeLog~'
 	mv '$(distdir)/ChangeLog~' '$(distdir)/ChangeLog'
 endif
+if ENABLE_TESTS
+if CROSS_COMPILING
+	if ! [ -f 'FORMATS' ]; then \
+		printf 'Error: "FORMATS" file cannot be generated when %s' \
+			'cross compiling' 1>&2; \
+		exit 1; \
+	fi
+else !CROSS_COMPILING
+	$(srcdir)/@ -d '1969-12-31 19:00:01' -F 1>FORMATS
+endif !CROSS_COMPILING
+else !ENABLE_TESTS
+	if ! [ -f 'FORMATS' ]; then \
+		printf 'Error: "FORMATS" file cannot be generated without %s' \
+			'test suite support' 1>&2; \
+		exit 1; \
+	fi
+endif !ENABLE_TESTS
 
 release:
 	sed "s/^Released: ????-??-??\$$/Released: $$(date '+%Y-%m-%d')/" \
diff --git a/README b/README
index 74ccb04..82796f6 100644
--- a/README
+++ b/README
@@ -18,79 +18,12 @@ user interaction.
 Date/Time Formats
 -----------------
 
-@ currently supports 705 date/time formats, any one of which may be
-specified on the command line in one or more arguments.  All spaces
-shown below are optional.
+@ currently supports 4341 date/time formats, any one of which may be
+specified on the command line in one or more arguments.  The date may be
+omitted or specified before or after the time.
 
-A time may be specified in any of the following eight formats:
-
-  * 7:00:01 PM
-  * 19:00:01
-  * 7:00 PM
-  * 19:00
-  * 70001 PM
-  * 190001
-  * 700 PM
-  * 1900
-
-A date may be omitted or specified (before or after the time) in any of
-the following 43 formats:
-
-  * Wed
-  * 1969-12-31
-  * 1969/12/31
-  * 12-31-1969
-  * 12-31
-  * 12/31/1969
-  * 12/31
-  * 31 Dec 1969
-  * 31 Dec
-  * 31-Dec-1969
-  * 31-Dec
-  * 31/Dec/1969
-  * 31/Dec
-  * Wed 31 Dec 1969
-  * Wed 31 Dec
-  * Wed 31-Dec-1969
-  * Wed 31-Dec
-  * Wed 31/Dec/1969
-  * Wed 31/Dec
-  * Wed, 31 Dec 1969
-  * Wed, 31 Dec
-  * Wed, 31-Dec-1969
-  * Wed, 31-Dec
-  * Wed, 31/Dec/1969
-  * Wed, 31/Dec
-  * Dec 31, 1969
-  * Dec 31
-  * Dec-31-1969
-  * Dec-31
-  * Dec/31/1969
-  * Dec/31
-  * Wed Dec 31, 1969
-  * Wed Dec 31
-  * Wed Dec-31-1969
-  * Wed Dec-31
-  * Wed Dec/31/1969
-  * Wed Dec/31
-  * Wed, Dec 31, 1969
-  * Wed, Dec 31
-  * Wed, Dec-31-1969
-  * Wed, Dec-31
-  * Wed, Dec/31/1969
-  * Wed, Dec/31
-
-Additionally, the following nine date/time formats are supported:
-
-  * 1969-12-31T19:00:01
-  * 1969-12-31T19:00
-  * 19691231T190001
-  * 19691231T1900
-  * 19691231 70001 PM
-  * 19691231 190001
-  * 19691231 700 PM
-  * 19691231 1900
-  * Wed Dec 31 19:00:01 1969
+See the `FORMATS` file for a list of supported formats.  All spaces
+shown are optional.
 
 Development
 -----------
diff --git a/TODO b/TODO
index 80653a8..66697c8 100644
--- a/TODO
+++ b/TODO
@@ -3,6 +3,5 @@ spaces between specifiers in strptime() formats -- strftime()?
 	parsing: copy format one char at a time, changing placeholder to space
 test with other libc's (newlib? musl? fbsd? obsd?)
 `./@ 7:00 PM` doesn't work with musl strptime()
-update formats in README (or move to another file?)
 test other times
 gettext?
diff --git a/configure.ac b/configure.ac
index bd957da..cb1f0ce 100644
--- a/configure.ac
+++ b/configure.ac
@@ -30,6 +30,8 @@ AM_CONDITIONAL([IN_GIT],
 
 AM_CONDITIONAL([OUT_OF_TREE], [test x"${srcdir}" != x'.' ])
 
+AM_CONDITIONAL([CROSS_COMPILING], [! test x"${build_alias}" = x"${host_alias}"])
+
 save_CFLAGS="${CFLAGS-}"
 AC_PROG_CC()
 AM_PROG_CC_C_O()