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+# Copyright 1999-2015 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+# @ECLASS: ruby-utils.eclass
+# @MAINTAINER:
+# Ruby team <ruby@gentoo.org>
+# @AUTHOR:
+# Author: Hans de Graaff <graaff@gentoo.org>
+# @BLURB: An eclass for supporting ruby scripts and bindings in non-ruby packages
+# @DESCRIPTION:
+# The ruby-utils eclass is designed to allow an easier installation of
+# Ruby scripts and bindings for non-ruby packages.
+#
+# This eclass does not set any metadata variables nor export any phase
+# functions. It can be inherited safely.
+
+
+if [[ ! ${_RUBY_UTILS} ]]; then
+
+
+# @ECLASS-VARIABLE: RUBY_TARGETS_PREFERENCE
+# @DESCRIPTION:
+# This variable lists all the known ruby targets in preference of use as
+# determined by the ruby team. By using this ordering rather than the
+# USE_RUBY mandated ordering we have more control over which ruby
+# implementation will be installed first (and thus eselected). This will
+# provide for a better first installation experience.
+
+# All RUBY_TARGETS
+RUBY_TARGETS_PREFERENCE="ruby22 ruby21 "
+
+# All other active ruby targets
+RUBY_TARGETS_PREFERENCE+="ruby23 ruby24"
+
+
+_ruby_implementation_depend() {
+	local rubypn=
+	local rubyslot=
+
+	case $1 in
+		ruby18)
+			rubypn="dev-lang/ruby"
+			rubyslot=":1.8"
+			;;
+		ruby19)
+			rubypn="dev-lang/ruby"
+			rubyslot=":1.9"
+			;;
+		ruby20)
+			rubypn="dev-lang/ruby"
+			rubyslot=":2.0"
+			;;
+		ruby21)
+			rubypn="dev-lang/ruby"
+			rubyslot=":2.1"
+			;;
+		ruby22)
+			rubypn="dev-lang/ruby"
+			rubyslot=":2.2"
+			;;
+		ruby23)
+			rubypn="dev-lang/ruby"
+			rubyslot=":2.3"
+			;;
+		ruby24)
+			rubypn="dev-lang/ruby"
+			rubyslot=":2.4"
+			;;
+		ree18)
+			rubypn="dev-lang/ruby-enterprise"
+			rubyslot=":1.8"
+			;;
+		jruby)
+			rubypn="dev-java/jruby"
+			rubyslot=""
+			;;
+		rbx)
+			rubypn="dev-lang/rubinius"
+			rubyslot=""
+			;;
+		*) die "$1: unknown Ruby implementation"
+	esac
+
+	echo "$2${rubypn}$3${rubyslot}"
+}
+
+
+
+_RUBY_UTILS=1
+fi