[gentoo-dev] [RFC] new vala.eclass

[Alexandre Rostovtsev <tetromino@gentoo.org>]

Here's a proposed new eclass to make it less painful to build vala
bindings in the new, vala-0.18.x, vapigen.m4-using era. See
https://bugzilla.gnome.org/show_bug.cgi?id=682202 for why messing around
with PKG_CONFIG_PATH is unfortunately needed for vapigen.m4-using
packages from gnome-3.6 such as librsvg-2.36.2, networkmanager-0.9.6.0,
libsecret-0.9.x, libgnome-keyring-3.6.x, accountsservice-0.6.24, etc.


# Copyright 1999-2012 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $

# @ECLASS: vala.eclass
# @MAINTAINER:
# gnome@gentoo.org
# @AUTHOR:
# Alexandre Rostovtsev <tetromino@gentoo.org>
# @BLURB: Sets up the environment for using a specific version of vala.
# @DESCRIPTION:
# This eclass sets up commonly used environment variables for using a specific
# version of dev-lang/vala to configure and build a package. It is needed for
# packages whose build systems assume the existence of certain unversioned vala
# executables, pkgconfig files, etc., which Gentoo does not provide.
#
# This eclass provides one phase function: pkg_setup.

inherit multilib

case "${EAPI:-0}" in
	0|1|2)
		die "EAPI=${EAPI} is not supported"
		;;
	*)
		EXPORT_FUNCTIONS pkg_setup
		;;
esac

# @ECLASS-VARIABLE: VALA_API_VERSION
# @DEFAULT_UNSET
# @DESCRIPTION:
# Vala API version (e.g. 0.16).

# @FUNCTION: vala_pkg_setup
# @DESCRIPTION:
# Sets up the environment variables and pkgconfig files for $VALA_API_VERSION.
vala_pkg_setup() {
	if [[ -z "${VALA_API_VERSION}" ]]; then
		die "VALA_API_VERSION not set"
	fi

	export VALAC=$(type -P valac-${VALA_API_VERSION})
	export VALA=$(type -P vala-${VALA_API_VERSION})
	export VALA_GEN_INTROSPECT=$(type -P vala-gen-introspect-${VALA_API_VERSION})
	export VAPIGEN="$(type -P vapigen-${VALA_API_VERSION})"
	export VAPIGEN_MAKEFILE="${EPREFIX}/usr/share/vala-${VALA_API_VERSION}/Makefile.vapigen"
	export VAPIGEN_VAPIDIR="${EPREFIX}/usr/share/vala/vapi"

	if ! [[ -d "${T}/pkgconfig" ]]; then
		mkdir "${T}/pkgconfig" || die "mkdir failed"
	fi
	local p
	for p in libvala vapigen; do
		local d
		for d in "${EPREFIX}/usr/$(get_libdir)/pkgconfig" "${EPREFIX}/usr/share/pkgconfig"; do
			if [[ -e "${d}/${p}-${VALA_API_VERSION}.pc" ]]; then
				ln -s "${d}/${p}-${VALA_API_VERSION}.pc" "${T}/pkgconfig/${p}.pc" || die "ln failed"
				break
			fi
		done
	done
	: ${PKG_CONFIG_PATH:="${EPREFIX}/usr/$(get_libdir)/pkgconfig:${EPREFIX}/usr/share/pkgconfig"}
	export PKG_CONFIG_PATH="${T}/pkgconfig:${PKG_CONFIG_PATH}"
}