# Copyright 1999-2010 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $


# eblit-core
# Usage: <function> [version] [eval]
# Main eblit engine
eblit-core() {
	[[ -z $FILESDIR ]] && FILESDIR="$(dirname $EBUILD)/files"
	local e v func=$1 ver=$2 eval_=$3
	for v in ${ver:+-}${ver} -${PVR} -${PV} "" ; do
		e="${FILESDIR}/eblits/${func}${v}.eblit"
		if [[ -e ${e} ]] ; then
			. "${e}"
			[[ ${eval_} == 1 ]] && eval "${func}() { eblit-run ${func} ${ver} ; }"
			return 0
		fi
	done
	return 1
}

# eblit-include
# Usage: [--skip] <function> [version]
# Includes an "eblit" -- a chunk of common code among ebuilds in a given
# package so that its functions can be sourced and utilized within the
# ebuild.
eblit-include() {
	local skipable=false r=0
	[[ $1 == "--skip" ]] && skipable=true && shift
	[[ $1 == pkg_* ]] && skipable=true

	[[ -z $1 ]] && die "Usage: eblit-include <function> [version]"
	eblit-core $1 $2
	r="$?"
	${skipable} && return 0
	[[ "$r" -gt "0" ]] && die "Could not locate requested eblit '$1' in ${FILESDIR}/eblits/"
}

# eblit-run-maybe
# Usage: <function>
# Runs a function if it is defined in an eblit
eblit-run-maybe() {
	[[ $(type -t "$@") == "function" ]] && "$@"
}

# eblit-run
# Usage: <function> [version]
# Runs a function defined in an eblit
eblit-run() {
	eblit-include --skip common "${*:2}"
	eblit-include "$@"
	eblit-run-maybe eblit-$1-pre
	eblit-${PN}-$1
	eblit-run-maybe eblit-$1-post
}

# eblit-pkg
# Usage: <phase> [version]
# Includes the given functions AND evals them so they're included in the binpkgs
eblit-pkg() {
	[[ -z $1 ]] && die "Usage: eblit-pkg <phase> [version]"
	eblit-core $1 $2 1
}