# Copyright 1999-2008 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $

# @ECLASS: pango-module.eclass
# @MAINTAINER:
# gnome@gentoo.org
# @BLURB: common functions for ebuilds that install Pango modules
# @DESCRIPTION:
# This eclass contains functions to help install Pango modules and
# manage the Pango modules path in conjunction with eselect-pango.

inherit multilib

RDEPEND="app-admin/eselect-pango"

if [[ -z ${PANGO_MODULE_NO_EXTRA_DEPS} ]]; then
	DEPEND=">=dev-util/pkgconfig-0.18"
	if [[ ${CATEGORY}/${PN} != x11-libs/pango ]]; then
		# This is here because it is used by the eclass itself, for
		# its .pc file.  It's not in RDEPEND because ebuilds should
		# specify that explicitly.
		DEPEND="${DEPEND} x11-libs/pango"
	fi
fi

# @FUNCTION: pango-module-add-modules-path
# @USAGE: <name> <path>
# @DESCRIPTION:
# Register <path> as containing Pango modules.  <name> should be of
# the form <digit><digit><identifier>, and determines the order in
# which the directories will be added to the search path (modules in
# later directories override earlier ones).  This function should be
# called in src_install.
pango-module-add-modules-path() {
	local name=$1 path="${2}"

	local dir=/etc/env.d/pango
	pango-module-multilib-enabled && dir=${dir}/${CHOST}

	[[ -e "${T}"/${name} ]] && die "${T}/${name} already exists"
	cat <<-EOF >"${T}"/${name}
		ModulesPath=${2}
	EOF

	local save_INSDESTTREE=${INSDESTTREE}
	insinto ${dir}
	doins "${T}"/${name} || die "doins failed"
	INSDESTTREE=${save_INSDESTTREE}
	rm -f "${T}"/${name}
}

# @FUNCTION: pango-module-standard-path
# @RETURN: /usr/$(get_libdir)/pango/$(pango-module-version)/modules
# @DESCRIPTION:
# Modules are typically installed under
# /usr/$(get_libdir)/pango/$(pango-module-version)/modules.  This
# should be handled by the package's build system, but ebuilds need to
# know the directory to pass it or a subdirectory to
# pango-module-add-modules-path.
pango-module-standard-path() {
	echo /usr/$(get_libdir)/pango/$(pango-module-version)/modules
}

if [[ -z ${PANGO_MODULE_NO_EXTRA_DEPS} ]]; then
# @FUNCTION: pango-module-version
# @RETURN: Returns the Pango module ABI version.
	pango-module-version() {
		local ver
		if [[ ${CATEGORY}/${PN} == x11-libs/pango ]]; then
			ver="$(PKG_CONFIG_PATH="${S}" PKG_CONFIG_DISABLE_UNINSTALLED=1 pkg-config --variable=pango_module_version pango)"
		else
			ver="$(pkg-config --variable=pango_module_version pango)"
		fi

		# Might not work because this gets called in a subshell. :-(
		[[ -n ${ver} ]] || die "Could not determine pango-module-version"
		echo "${ver}"
	}
else
	pango-module-version() {
		die "Can't call pango-module-version because PANGO_MODULE_NO_EXTRA_DEPS is set"
	}
fi

# @ECLASS-VARIABLE: PANGO_MODULE_NO_EXTRA_DEPS
# @DESCRIPTION:
# Set to non-empty, before inheriting the eclass, if the ebuild does
# not use the pango-module-version or pango-module-standard-path
# functions, to avoid adding the extra dependencies needed for these
# functions to work.  Mainly for use by app-emulation/emul-linux-x86-gtklibs.
PANGO_MODULE_NO_EXTRA_DEPS=
# We need to unconditionally set this to empty for eclass-manpages to
# work properly.  It doesn't matter because we've already used it by
# this point.

# @FUNCTION: pango-module_pkg_postinst
# @DESCRIPTION:
# Runs eselect pango update to update the /etc/pango/pango.modules file.
pango-module_pkg_postinst() {
	if [[ ${ROOT} == / ]]; then
		eselect pango update
	else
		ewarn 'Not updating pango.modules because ${ROOT} != /'
	fi
}

# @FUNCTION: pango-module_pkg_postrm
# @DESCRIPTION:
# Runs eselect pango update to update the /etc/pango/pango.modules file.
pango-module_pkg_postrm() {
	if [[ ${ROOT} == / ]]; then
		eselect pango update
	else
		ewarn 'Not updating pango.modules because ${ROOT} != /'
	fi
}

# @FUNCTION: pango-module-multilib-enabled
# @RETURN: True if an extra ${CHOST} directory under /etc/pango should be used.
# @DESCRIPTION:
# Most ebuilds won't need to use this, it's mainly for internal use
# and for Pango itself.
pango-module-multilib-enabled() {
	has_multilib_profile || ( use x86 && [[ $(get_libdir) == lib32 ]] )
}

EXPORT_FUNCTIONS pkg_postinst pkg_postrm