# src/nls-global.mk

# Common rules for Native Language Support (NLS)
#
# If some subdirectory of the source tree wants to provide NLS, it
# needs to contain a file 'nls.mk' with the following make variable
# assignments:
#
# CATALOG_NAME		-- name of the message catalog (xxx.po); probably
#			   name of the program
# AVAIL_LANGUAGES	-- list of languages that are provided/supported
# GETTEXT_FILES		-- list of source files that contain message strings
# GETTEXT_TRIGGERS	-- (optional) list of functions that contain
#                          translatable strings
#
# That's all, the rest is done here, if --enable-nls was specified.
#
# The only user-visible targets here are 'init-po', to make an initial
# "blank" catalog from program sources, and 'update-po', which is to
# be called if the messages in the program source have changed, in
# order to merge the changes into the existing .po files.


# existence checked by Makefile.global; otherwise we won't get here
include $(srcdir)/nls.mk

# If user specified the languages he wants in --enable-nls=LANGUAGES,
# filter out the rest.  Else use all available ones.
ifdef WANTED_LANGUAGES
LANGUAGES = $(filter $(WANTED_LANGUAGES), $(AVAIL_LANGUAGES))
else
LANGUAGES = $(AVAIL_LANGUAGES)
endif

PO_FILES = $(addprefix po/, $(addsuffix .po, $(LANGUAGES)))
MO_FILES = $(addprefix po/, $(addsuffix .mo, $(LANGUAGES)))

ifdef XGETTEXT
XGETTEXT += -ctranslator --copyright-holder='PostgreSQL Global Development Group' --msgid-bugs-address=pgsql-bugs@postgresql.org
endif


all-po: $(MO_FILES)

%.mo: %.po
	$(MSGFMT) -o $@ $<

ifdef XGETTEXT
ifeq ($(word 1,$(GETTEXT_FILES)),+)
po/$(CATALOG_NAME).pot: $(word 2, $(GETTEXT_FILES)) $(MAKEFILE_LIST)
	$(XGETTEXT) -D $(srcdir) -n $(addprefix -k, $(GETTEXT_TRIGGERS)) -f $<
else
po/$(CATALOG_NAME).pot: $(GETTEXT_FILES) $(MAKEFILE_LIST)
# Change to srcdir explicitly, don't rely on $^.  That way we get
# consistent #: file references in the po files.
	$(XGETTEXT) -D $(srcdir) -n $(addprefix -k, $(GETTEXT_TRIGGERS)) $(GETTEXT_FILES)
endif
	@$(MKDIR_P) $(dir $@)
	sed -e '1,18 { s/SOME DESCRIPTIVE TITLE./LANGUAGE message translation file for $(CATALOG_NAME)/;s/PACKAGE/PostgreSQL/g;s/VERSION/$(MAJORVERSION)/g;s/YEAR/'`date +%Y`'/g; }' messages.po >$@
	rm messages.po
else # not XGETTEXT
	@echo "You don't have 'xgettext'."; exit 1
endif # not XGETTEXT


# catalog name extentions must match behavior of PG_TEXTDOMAIN() in c.h
install-po: all-po installdirs-po
ifneq (,$(LANGUAGES))
	for lang in $(LANGUAGES); do \
	  $(INSTALL_DATA) po/$$lang.mo '$(DESTDIR)$(localedir)'/$$lang/LC_MESSAGES/$(CATALOG_NAME)$(SO_MAJOR_VERSION)-$(MAJORVERSION).mo || exit 1; \
	done
endif

installdirs-po:
	$(if $(LANGUAGES),$(MKDIR_P) $(foreach lang, $(LANGUAGES), '$(DESTDIR)$(localedir)'/$(lang)/LC_MESSAGES),:)

uninstall-po:
	$(if $(LANGUAGES),rm -f $(foreach lang, $(LANGUAGES), '$(DESTDIR)$(localedir)'/$(lang)/LC_MESSAGES/$(CATALOG_NAME)$(SO_MAJOR_VERSION)-$(MAJORVERSION).mo),:)


clean-po:
	$(if $(MO_FILES),rm -f $(MO_FILES))
	@$(if $(wildcard po/*.po.new),rm -f po/*.po.new)
	rm -f po/$(CATALOG_NAME).pot


maintainer-check-po: $(PO_FILES)
	for file in $^; do \
	  $(MSGFMT) -c -v -o /dev/null $$file || exit 1; \
	done


init-po: po/$(CATALOG_NAME).pot


# For performance reasons, only calculate these when the user actually
# requested update-po or a specific file.
ifneq (,$(filter update-po %.po.new,$(MAKECMDGOALS)))
ALL_LANGUAGES := $(shell find $(top_srcdir) -name '*.po' -print | sed 's,^.*/\([^/]*\).po$$,\1,' | sort -u)
all_compendia := $(shell find $(top_srcdir) -name '*.po' -print)
else
ALL_LANGUAGES = $(AVAIL_LANGUAGES)
all_compendia = FORCE
FORCE:
endif

ifdef WANTED_LANGUAGES
ALL_LANGUAGES := $(filter $(WANTED_LANGUAGES), $(ALL_LANGUAGES))
endif

update-po: $(ALL_LANGUAGES:%=po/%.po.new)

$(AVAIL_LANGUAGES:%=po/%.po.new): po/%.po.new: po/%.po po/$(CATALOG_NAME).pot $(all_compendia)
	$(MSGMERGE) $(word 1, $^) $(word 2,$^) -o $@ $(addprefix --compendium=,$(filter %/$*.po,$(wordlist 3,$(words $^),$^)))

# For languages not yet available, merge against oneself, to pick
# up translations from the compendia.  (Merging against /dev/null
# doesn't work so well; it inserts the headers from the first-named
# compendium.)
po/%.po.new: po/$(CATALOG_NAME).pot $(all_compendia)
	$(MSGMERGE) $(word 1,$^) $(word 1,$^) -o $@ $(addprefix --compendium=,$(filter %/$*.po,$(wordlist 2,$(words $^),$^)))


all: all-po
install: install-po
installdirs: installdirs-po
uninstall: uninstall-po
clean distclean maintainer-clean: clean-po
maintainer-check: maintainer-check-po

.PHONY: all-po install-po installdirs-po uninstall-po clean-po \
        maintainer-check-po init-po update-po
