New eclass.

2 files changed, 127 insertions, 1 deletions

diff --git a/eclass/ChangeLog b/eclass/ChangeLog
index f5efaa9be1f6..5b3a38042466 100644
--- a/eclass/ChangeLog
+++ b/eclass/ChangeLog
@@ -1,6 +1,9 @@
 # ChangeLog for eclass directory
 # Copyright 1999-2012 Gentoo Foundation; Distributed under the GPL v2
-# $Header: /var/cvsroot/gentoo-x86/eclass/ChangeLog,v 1.393 2012/09/11 16:40:05 radhermit Exp $
+# $Header: /var/cvsroot/gentoo-x86/eclass/ChangeLog,v 1.394 2012/09/12 20:22:39 tetromino Exp $
+
+  12 Sep 2012; Alexandre Rostovtsev <tetromino@gentoo.org> +vala.eclass:
+  New eclass.
 
   11 Sep 2012; Tim Harder <radhermit@gentoo.org> vim.eclass:
   Allow vim to be built against ruby-1.9.
diff --git a/eclass/vala.eclass b/eclass/vala.eclass
new file mode 100644
index 000000000000..f609003ab181
--- /dev/null
+++ b/eclass/vala.eclass
@@ -0,0 +1,123 @@
+# Copyright 1999-2012 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+# $Header: /var/cvsroot/gentoo-x86/eclass/vala.eclass,v 1.1 2012/09/12 20:22:39 tetromino Exp $
+
+# @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: src_prepare.
+
+inherit multilib
+
+case "${EAPI:-0}" in
+	0)	die "EAPI=0 is not supported" ;;
+	1)	;;
+	*)	EXPORT_FUNCTIONS src_prepare ;;
+esac
+
+# @ECLASS-VARIABLE: VALA_MIN_API_VERSION
+# @DEFAULT_UNSET
+# @DESCRIPTION:
+# Minimum vala API version (e.g. 0.16).
+VALA_MIN_API_VERSION=${VALA_MIN_API_VERSION:-0.10}
+
+# @ECLASS-VARIABLE: VALA_MAX_API_VERSION
+# @DEFAULT_UNSET
+# @DESCRIPTION:
+# Maximum vala API version (e.g. 0.18).
+VALA_MAX_API_VERSION=${VALA_MAX_API_VERSION:-0.18}
+
+# @ECLASS-VARIABLE: VALA_USE_DEPEND
+# @DEFAULT_UNSET
+# @DESCRIPTION:
+# USE dependencies that vala must be built with (e.g. vapigen).
+
+# @FUNCTION: vala_api_versions
+# @DESCRIPTION:
+# Outputs a list of vala API versions from VALA_MAX_API_VERSION down to
+# VALA_MIN_API_VERSION.
+vala_api_versions() {
+	eval "echo 0.{${VALA_MAX_API_VERSION#0.}..${VALA_MIN_API_VERSION#0.}..2}"
+}
+
+# @FUNCTION: vala_depend
+# @DESCRIPTION:
+# Outputs a ||-dependency string on vala from VALA_MAX_API_VERSION down to
+# VALA_MIN_API_VERSION
+vala_depend() {
+	local u v versions=$(vala_api_versions)
+	[[ ${VALA_USE_DEPEND} ]] && u="[${VALA_USE_DEPEND}]"
+
+	echo -n "|| ("
+	for v in ${versions}; do
+		echo -n " dev-lang/vala:${v}${u}"
+	done
+	echo " )"
+}
+
+# @FUNCTION: vala_best_api_version
+# @DESCRIPTION:
+# Returns the highest installed vala API version satisfying
+# VALA_MAX_API_VERSION, VALA_MIN_API_VERSION, and VALA_USE_DEPEND.
+vala_best_api_version() {
+	local u v
+	[[ ${VALA_USE_DEPEND} ]] && u="[${VALA_USE_DEPEND}]"
+	for v in $(vala_api_versions); do
+		has_version "dev-lang/vala:${v}${u}" && echo "${v}" && return
+	done
+}
+
+# @FUNCTION: vala_src_prepare
+# @USAGE: [--vala-api-version api_version]
+# @DESCRIPTION:
+# Sets up the environment variables and pkgconfig files for the
+# specified API version, or, if no version is specified, for the
+# highest installed vala API version satisfying
+# VALA_MAX_API_VERSION, VALA_MIN_API_VERSION, and VALA_USE_DEPEND.
+# Dies if called without --vala-api-version and no suitable vala
+# version is found.
+vala_src_prepare() {
+	local p d valafoo version
+
+	if [[ $1 = "--vala-api-version" ]]; then
+		version=$2
+		[[ ${version} ]] || die "'--vala-api-version' option requires API version parameter."
+	else
+		version=$(vala_best_api_version)
+		[[ ${version} ]] || die "No installed vala in $(vala_depend)"
+	fi
+
+	export VALAC=$(type -P valac-${version})
+
+	valafoo=$(type -P vala-gen-introspect-${VALA_API_VERSION})
+	[[ ${valafoo} ]] && export VALA_GEN_INTROSPECT=$(type -P vala-gen-introspect-${version})
+
+	valafoo=$(type -P vapigen-${VALA_API_VERSION})
+	[[ ${valafoo} ]] && export VAPIGEN="${valafoo}"
+
+	valafoo="${EPREFIX}/usr/share/vala/Makefile.vapigen"
+	[[ -e ${valafoo} ]] && export VAPIGEN_MAKEFILE="${valafoo}"
+
+	export VAPIGEN_VAPIDIR="${EPREFIX}/usr/share/vala/vapi"
+
+	mkdir -p "${T}/pkgconfig" || die "mkdir failed"
+	for p in libvala vapigen; do
+		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}"
+}