eclass/glo-utils.eclass


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# Copyright 1999-2010 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $
#
# This eclass contains various utilities used in the Gentoo Lisp overlay
#
# Public functions:
#
# glo_usev flagname [<if_yes> [<if_no>]]
#   If $(use FLAGNAME) return true, echo IF_YES to standard output,
#   otherwise echo IF_NO. IF_YES defaults to FLAGNAME if not specified
#
# glo_best_flag flag+
#   Echo to stdout the first active USE flag among those supplied as parameters.
#   If none are active, echo the first one
#

glo_usev() {
	if [[ $# < 1 || $# > 3 ]]; then
		echo "Usage: ${0} flag [if_yes [if_no]]"
		die "${0}: wrong number of arguments: $#"
	fi
	local if_yes="${2:-${1}}" if_no="${3}"
	if useq ${1} ; then
		printf "%s" "${if_yes}"
		return 0
	else
		printf "%s" "${if_no}"
		return 1
	fi
}

glo_best_flag() {
	if [[ $# < 1 ]]; then
		echo "Usage: ${0} flag+"
		die "${0}: wrong number of arguments: $#"
	fi
	for flag in $@ ; do
		if use ${flag} ; then
			echo ${flag}
			return
		fi
	done
	echo ${1}
}