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

[Alexandre Rostovtsev]

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:
# gn...@gentoo.org
# @AUTHOR:
# Alexandre Rostovtsev <tetrom...@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}"
}