# $Id$
#
# common rules for gettext handling.
#
# Defines the 'update-po' target for updating the translations and
# the 'install-mo' target, which installs the translations into
# $(prefix)/share/locale
#
# Creating an initial po/$(ARTIFACT).pot file is enabled by the target 'pot',
# i.e. in some build directory call
#
#   make pot
#
# Building a translation package is possible by calling
#
#   make install-mo DESTDIR=`pwd`/debian/my-pkg-i18n
#
# Building a translation package for an individual language is possible by calling
#
#   make install-mo LANGUAGES="de de_AT" DESTDIR=`pwd`/debian/my-pkg-i18n-de
#
# Variables:
#
# srcdir    ... source directory.
# SOURCES   ... list of source packages to compile.
# ARTIFACT  ... name of the build artifact.
# I18N_PFX  ... prefix for $(I18N_PFX)_i18n and $(I18N_PFX)_i18n_n functions. Defaults to ARTIFACT, if not specified.
# LANGUAGES ... list of languages for which a po/$(ARTIFACT)_$lang.po file exists.
#
# This snippet assumes, that your code translates messages using these functions:
#
# const char *$(I18N_PFX)_i18n(const char *msg)
# const char *$(I18N_PFX)_i18n_c(const char *msg) // contextualized, everything up to the first '|' is interpreted as context
# const char *$(I18N_PFX)_i18n_n(const char *msg, const char *plural_msg, long n)
# QString qs_$(I18N_PFX)_i18n(const char *msg)
# QString qs_$(I18N_PFX)_i18n_c(const char *msg) // contextualized, everything up to the first '|' is interpreted as context
#

POTFILE=$(srcdir)/po/$(ARTIFACT).pot
POFILES=$(addprefix $(srcdir)/po/$(ARTIFACT)_, $(addsuffix .po, $(LANGUAGES)))
UICSOURCES=$(addsuffix _uic.cpp,$(basename $(UICFILES))) 
POSOURCES=$(addprefix $(srcdir)/, $(SOURCES)) $(UICSOURCES)

ifeq ($(I18N_PFX),)
I18N_PFX=$(ARTIFACT)
endif

$(POTFILE): $(POSOURCES)
	mkdir -p $(srcdir)/po && xgettext --from-code=UTF-8 --keyword=$(I18N_PFX)_i18n --keyword=$(I18N_PFX)_i18n_c:1g --keyword=$(I18N_PFX)_i18n_n:1,2 --keyword=qs_$(I18N_PFX)_i18n --keyword=qs_$(I18N_PFX)_i18n_c:1g -D $(srcdir) -D . -o $(POTFILE) $(SOURCES) $(UICSOURCES)

$(srcdir)/po/$(ARTIFACT)_%.po: $(POTFILE)
	if test -f $@; then msgmerge -U $@ $<; else msginit -l $*.UTF-8 -i $< -o $@; fi

pot:: $(POTFILE)

ifneq ($(LANGUAGES),)

update-po:: $(POFILES)

install-mo::
	for lang in $(LANGUAGES); do mkdir -p $(DESTDIR)$(prefix)/share/locale/$$lang/LC_MESSAGES; msgfmt -o $(DESTDIR)$(prefix)/share/locale/$$lang/LC_MESSAGES/$(ARTIFACT).mo $(srcdir)/po/$(ARTIFACT)_$$lang.po; done

endif