maint: Update "maint.mk"

* maint.mk (gpg_key_ID, gnu_rel_host, noteworthy_changes)
(gnu_ftp_host-alpha, gnu_ftp_host-beta)
(gnu_ftp_host-stable): New macros.
(release, upload, web-manual, web-manual-update): New rules.

maint.mk

@@ -61,3 +61,66 @@ fetch:
 	done
 	$(AM_V_at)rm -rf Fetchdir
 .PHONY: fetch
+
+# If it's not already specified, derive the GPG key ID from
+# the signed tag we've just applied to mark this release.
+gpg_key_ID = \
+  $$(cd $(srcdir) \
+     && git cat-file tag v$(VERSION) \
+        | gpgv --status-fd 1 --keyring /dev/null - - 2>/dev/null \
+        | awk '/^\[GNUPG:\] ERRSIG / {print $$3; exit}')
+
+# Use alpha.gnu.org for alpha and beta releases.
+# Use ftp.gnu.org for stable releases.
+gnu_ftp_host-alpha = alpha.gnu.org
+gnu_ftp_host-beta = alpha.gnu.org
+gnu_ftp_host-stable = ftp.gnu.org
+gnu_rel_host = $(gnu_ftp_host-$(release-type))
+
+noteworthy_changes = * Noteworthy changes in release ?.? (????-??-??) [?]
+
+.PHONY: release
+release:
+	cd $(srcdir) && rm -rf autom4te.cache && ./bootstrap && ./configure
+	$(AM_V_at)$(MAKE) Makefile
+	$(AM_V_at)$(srcdir)/build-aux/announce-gen \
+	    --mail-headers='To: ??? Mail-Followup-To: $(PACKAGE_BUGREPORT)' \
+	    --release-type=$(release-type) \
+	    --package=$(PACKAGE) \
+	    --prev=`cat .prev-version` \
+	    --curr=$(VERSION) \
+	    --gpg-key-id=$(gpg_key_ID) \
+	    --srcdir=$(srcdir) \
+	    --news=$(srcdir)/NEWS \
+	    --bootstrap-tools=autoconf,automake,help2man \
+	    --no-print-checksums \
+	    --url-dir=https://ftp.gnu.org/gnu/$(PACKAGE) \
+	  > ~/announce-$(PACKAGE)-$(VERSION)
+	$(AM_V_at)echo $(VERSION) > .prev-version
+	$(AM_V_at)perl -pi \
+	  -e '$$. == 3 and print "$(noteworthy_changes)\n\n\n"' \
+	  $(srcdir)/NEWS
+	$(AM_V_at)msg=`printf '%s\n' 'maint: Post-release administrivia' '' \
+	    '* NEWS: Add header line for next release.' \
+	    '* .prev-version: Record previous version.'` || exit 1; \
+	git commit -m "$$msg" -a
+
+.PHONY: upload
+upload:
+	$(srcdir)/build-aux/gnupload $(GNUPLOADFLAGS) \
+	  --to $(gnu_rel_host):$(PACKAGE) \
+	  $(DIST_ARCHIVES)
+
+.PHONY: web-manual
+web-manual:
+	$(AM_V_at)cd '$(srcdir)/doc'; \
+	  $(SHELL) ../build-aux/gendocs.sh \
+	     -o '$(abs_builddir)/doc/manual' \
+	     --email $(PACKAGE_BUGREPORT) $(PACKAGE) \
+	    "$(PACKAGE_STRING) Reference Manual"
+	$(AM_V_at)echo " *** Upload the doc/manual directory to web-cvs."
+
+.PHONY: web-manual-update
+web-manual-update:
+	$(AM_V_GEN)cd $(srcdir) \
+	  && build-aux/gnu-web-doc-update -C $(abs_builddir)