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List:       gentoo-dev
Subject:    [gentoo-dev] New ruby-single eclass
From:       Hans de Graaff <graaff () gentoo ! org>
Date:       2015-04-28 18:24:00
Message-ID: 1430245440.6146.12.camel () gentoo ! org
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Hi,

The current ruby eclasses work fairly well for ruby-only packages, but
support for packages where ruby is only part of the package are not well
served. As a start the ruby team proposes the following new eclass,
ruby-single.eclass. The purpose of this eclass is to provide support for
the case where a working ruby version needs to be accessed
via /usr/bin/ruby. Examples of such packages are net-libs/webkit-gtk and
sys-block/thin-provisioning-tools.

The eclass is loosely modeled after the python-single eclass-r1,
although not all the functionality available there can be or has been
provided for ruby at the moment. We've tried to keep variable and method
names compatible, though.

Also contained in this email is a new ruby-utils eclass which contains
code factored out of the current ruby-ng eclass, so that it can used by
both eclasses. ruby-utils.eclass is not meant to be used in ebuilds.

Full example code including an ebuild (app-admin/pwstore) is available
in the "ruby" repository.

Thanks,

Hans

["ruby-single.eclass" (ruby-single.eclass)]

# Copyright 1999-2014 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/eclass/python-single-r1.eclass,v 1.26 2014/05/26 16:13:35 mgorny Exp $

# @ECLASS: ruby-single
# @MAINTAINER:
# Ruby team <ruby@gentoo.org>
# @AUTHOR:
# Author: Hans de Graaff <graaff@gentoo.org>
# Based on python-single-r1 by: Michał Górny <mgorny@gentoo.org>
# @BLURB: An eclass for Ruby packages not installed for multiple implementations.
# @DESCRIPTION:
# An eclass for packages which don't support being installed for
# multiple Ruby implementations. This mostly includes ruby-based
# scripts.

case "${EAPI:-0}" in
	0|1|2|3)
		die "Unsupported EAPI=${EAPI:-0} (too old) for ${ECLASS}"
		;;
	4|5)
		;;
	*)
		die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}"
		;;
esac

inherit ruby-utils

# @ECLASS-VARIABLE: USE_RUBY
# @DEFAULT_UNSET
# @REQUIRED
# @DESCRIPTION:
# This variable contains a space separated list of targets (see above) a package
# is compatible to. It must be set before the `inherit' call. There is no
# default. All ebuilds are expected to set this variable.


# @ECLASS-VARIABLE: RUBY_DEPS
# @DESCRIPTION:
#
# This is an eclass-generated Ruby dependency string for all
# implementations listed in USE_RUBY. Any one of the supported ruby
# targets will satisfy this dependency.
#
# Example use:
# @CODE
# RDEPEND="${RUBY_DEPS}
#   dev-foo/mydep"
# BDEPEND="${RDEPEND}"
# @
#
# Example value:
# @CODE
# || ( dev-lang/ruby:2.0 dev-lang/ruby:1.9 )
# @CODE

_ruby_single_implementations_depend() {
	local depend
	for _ruby_implementation in ${RUBY_TARGETS_PREFERENCE}; do
		if [[ ${USE_RUBY} =~ ${_ruby_implementation} ]]; then
			depend="${depend} $(_ruby_implementation_depend $_ruby_implementation)"
		fi
	done
	echo "|| ( ${depend} )"
}

_ruby_single_set_globals() {
	RUBY_DEPS=$(_ruby_single_implementations_depend)
}
_ruby_single_set_globals

["ruby-utils.eclass" (ruby-utils.eclass)]

# Copyright 1999-2013 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/eclass/ruby-ng.eclass,v 1.53 2013/12/26 07:11:48 graaff Exp $

# @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.


case ${EAPI} in
	0|1|2)
		die "Unsupported EAPI=${EAPI} (too old) for ${ECLASS}" ;;
	3|4|5) ;;
	*)
		die "Unknown EAPI=${EAPI} for ${ECLASS}"
esac

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="ruby20 ruby19 "

# All other active ruby targets
RUBY_TARGETS_PREFERENCE+="ruby21 rbx jruby "


_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"
			;;
		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

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