gentoo-x86/eclass/ruby-ng.eclass

# Copyright 1999-2014 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/eclass/ruby-ng.eclass,v 1.54 2014/01/16 07:57:40 graaff Exp $

# @ECLASS: ruby-ng.eclass
# @MAINTAINER:
# Ruby herd <ruby@gentoo.org>
# @AUTHOR:
# Author: Diego E. Pettenò <flameeyes@gentoo.org>
# Author: Alex Legler <a3li@gentoo.org>
# Author: Hans de Graaff <graaff@gentoo.org>
# @BLURB: An eclass for installing Ruby packages with proper support for multiple Ruby slots.
# @DESCRIPTION:
# The Ruby eclass is designed to allow an easier installation of Ruby packages
# and their incorporation into the Gentoo Linux system.
#
# Currently available targets are:
#  * ruby18 - Ruby (MRI) 1.8.x
#  * ruby19 - Ruby (MRI) 1.9.x
#  * ruby20 - Ruby (MRI) 2.0.x
#  * ruby21 - Ruby (MRI) 2.1.x
#  * ruby22 - Ruby (MRI) 2.2.x
#  * ree18  - Ruby Enterprise Edition 1.8.x
#  * jruby  - JRuby
#  * rbx    - Rubinius
#
# This eclass does not define the implementation of the configure,
# compile, test, or install phases. Instead, the default phases are
# used.  Specific implementations of these phases can be provided in
# the ebuild either to be run for each Ruby implementation, or for all
# Ruby implementations, as follows:
#
#  * each_ruby_configure
#  * all_ruby_configure

# @ECLASS-VARIABLE: USE_RUBY
# @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_PATCHES
# @DEFAULT_UNSET
# @DESCRIPTION:
# A String or Array of filenames of patches to apply to all implementations.

# @ECLASS-VARIABLE: RUBY_OPTIONAL
# @DESCRIPTION:
# Set the value to "yes" to make the dependency on a Ruby interpreter
# optional and then ruby_implementations_depend() to help populate
# DEPEND and RDEPEND.

# @ECLASS-VARIABLE: RUBY_S
# @DEFAULT_UNSET
# @DESCRIPTION:
# If defined this variable determines the source directory name after
# unpacking. This defaults to the name of the package. Note that this
# variable supports a wildcard mechanism to help with github tarballs
# that contain the commit hash as part of the directory name.

# @ECLASS-VARIABLE: RUBY_QA_ALLOWED_LIBS
# @DEFAULT_UNSET
# @DESCRIPTION:
# If defined this variable contains a whitelist of shared objects that
# are allowed to exist even if they don't link to libruby. This avoids
# the QA check that makes this mandatory. This is most likely not what
# you are looking for if you get the related "Missing links" QA warning,
# since the proper fix is almost always to make sure the shared object
# is linked against libruby. There are cases were this is not the case
# and the shared object is generic code to be used in some other way
# (e.g. selenium's firefox driver extension). When set this argument is
# passed to "grep -E" to remove reporting of these shared objects.

inherit eutils java-utils-2 multilib toolchain-funcs

EXPORT_FUNCTIONS src_unpack src_prepare src_configure src_compile src_test src_install pkg_setup

case ${EAPI} in
        0|1)
                die "Unsupported EAPI=${EAPI} (too old) for ruby-ng.eclass" ;;
        2|3) ;;
        4|5)
                # S is no longer automatically assigned when it doesn't exist.
                S="${WORKDIR}"
                ;;
        *)
                die "Unknown EAPI=${EAPI} for ruby-ng.eclass"
esac

# @FUNCTION: ruby_implementation_depend
# @USAGE: target [comparator [version]]
# @RETURN: Package atom of a Ruby implementation to be used in dependencies.
# @DESCRIPTION:
# This function returns the formal package atom for a Ruby implementation.
#
# `target' has to be one of the valid values for USE_RUBY (see above)
#
# Set `comparator' and `version' to include a comparator (=, >=, etc.) and a
# version string to the returned string
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"
                        ;;
                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}"
}

# @FUNCTION: ruby_samelib
# @RETURN: use flag string with current ruby implementations
# @DESCRIPTION:
# Convenience function to output the use dependency part of a
# dependency. Used as a building block for ruby_add_rdepend() and
# ruby_add_bdepend(), but may also be useful in an ebuild to specify
# more complex dependencies.
ruby_samelib() {
        local res=
        for _ruby_implementation in $USE_RUBY; do
                has -${_ruby_implementation} $@ || \
                        res="${res}ruby_targets_${_ruby_implementation}?,"
        done

        echo "[${res%,}]"
}

_ruby_atoms_samelib_generic() {
        eshopts_push -o noglob
        echo "RUBYTARGET? ("
        for token in $*; do
                case "$token" in
                        "||" | "(" | ")" | *"?")
                                echo "${token}" ;;
                        *])
                                echo "${token%[*}[RUBYTARGET,${token/*[}" ;;
                        *)
                                echo "${token}[RUBYTARGET]" ;;
                esac
        done
        echo ")"
        eshopts_pop
}

# @FUNCTION: ruby_implementation_command
# @RETURN: the path to the given ruby implementation
# @DESCRIPTION:
# Not all implementations have the same command basename as the
# target; namely Ruby Enterprise 1.8 uses ree18 and rubyee18
# respectively. This function translate between the two
ruby_implementation_command() {
        local _ruby_name=$1

                # Add all USE_RUBY values where the flag name diverts from the binary here
        case $1 in
                ree18)
                        _ruby_name=rubyee18
                        ;;
        esac

        echo $(type -p ${_ruby_name} 2>/dev/null)
}

_ruby_atoms_samelib() {
        local atoms=$(_ruby_atoms_samelib_generic "$*")

        for _ruby_implementation in $USE_RUBY; do
                echo "${atoms//RUBYTARGET/ruby_targets_${_ruby_implementation}}"
        done
}

_ruby_wrap_conditions() {
        local conditions="$1"
        local atoms="$2"

        for condition in $conditions; do
                atoms="${condition}? ( ${atoms} )"
        done

        echo "$atoms"
}

# @FUNCTION: ruby_add_rdepend
# @USAGE: dependencies
# @DESCRIPTION:
# Adds the specified dependencies, with use condition(s) to RDEPEND,
# taking the current set of ruby targets into account. This makes sure
# that all ruby dependencies of the package are installed for the same
# ruby targets. Use this function for all ruby dependencies instead of
# setting RDEPEND yourself. The list of atoms uses the same syntax as
# normal dependencies.
#
# Note: runtime dependencies are also added as build-time test
# dependencies.
ruby_add_rdepend() {
        case $# in
                1) ;;
                2)
                        [[ "${GENTOO_DEV}" == "yes" ]] && eqawarn "You can now use the usual syntax in ruby_add_rdepend for $CATEGORY/$PF"
                        ruby_add_rdepend "$(_ruby_wrap_conditions "$1" "$2")"
                        return
                        ;;
                *)
                        die "bad number of arguments to $0"
                        ;;
        esac

        local dependency=$(_ruby_atoms_samelib "$1")

        RDEPEND="${RDEPEND} $dependency"

        # Add the dependency as a test-dependency since we're going to
        # execute the code during test phase.
        DEPEND="${DEPEND} test? ( ${dependency} )"
        has test "$IUSE" || IUSE="${IUSE} test"
}

# @FUNCTION: ruby_add_bdepend
# @USAGE: dependencies
# @DESCRIPTION:
# Adds the specified dependencies, with use condition(s) to DEPEND,
# taking the current set of ruby targets into account. This makes sure
# that all ruby dependencies of the package are installed for the same
# ruby targets. Use this function for all ruby dependencies instead of
# setting DEPEND yourself. The list of atoms uses the same syntax as
# normal dependencies.
ruby_add_bdepend() {
        case $# in
                1) ;;
                2)
                        [[ "${GENTOO_DEV}" == "yes" ]] && eqawarn "You can now use the usual syntax in ruby_add_bdepend for $CATEGORY/$PF"
                        ruby_add_bdepend "$(_ruby_wrap_conditions "$1" "$2")"
                        return
                        ;;
                *)
                        die "bad number of arguments to $0"
                        ;;
        esac

        local dependency=$(_ruby_atoms_samelib "$1")

        DEPEND="${DEPEND} $dependency"
        RDEPEND="${RDEPEND}"
}

# @FUNCTION: ruby_get_use_implementations
# @DESCRIPTION:
# Gets an array of ruby use targets enabled by the user
ruby_get_use_implementations() {
        local i implementation
        for implementation in ${USE_RUBY}; do
                use ruby_targets_${implementation} && i+=" ${implementation}"
        done
        echo $i
}

# @FUNCTION: ruby_get_use_targets
# @DESCRIPTION:
# Gets an array of ruby use targets that the ebuild sets
ruby_get_use_targets() {
        local t implementation
        for implementation in ${USE_RUBY}; do
                t+=" ruby_targets_${implementation}"
        done
        echo $t
}

# @FUNCTION: ruby_implementations_depend
# @RETURN: Dependencies suitable for injection into DEPEND and RDEPEND.
# @DESCRIPTION:
# Produces the dependency string for the various implementations of ruby
# which the package is being built against. This should not be used when
# RUBY_OPTIONAL is unset but must be used if RUBY_OPTIONAL=yes. Do not
# confuse this function with ruby_implementation_depend().
#
# @EXAMPLE:
# EAPI=4
# RUBY_OPTIONAL=yes
#
# inherit ruby-ng
# ...
# DEPEND="ruby? ( $(ruby_implementations_depend) )"
# RDEPEND="${DEPEND}"
ruby_implementations_depend() {
        local depend
        for _ruby_implementation in ${USE_RUBY}; do
                depend="${depend}${depend+ }ruby_targets_${_ruby_implementation}? ( $(ruby_implementation_depend $_ruby_implementation) )"
        done
        echo "${depend}"
}

IUSE+=" $(ruby_get_use_targets)"
# If you specify RUBY_OPTIONAL you also need to take care of
# ruby useflag and dependency.
if [[ ${RUBY_OPTIONAL} != yes ]]; then
        DEPEND="${DEPEND} $(ruby_implementations_depend)"
        RDEPEND="${RDEPEND} $(ruby_implementations_depend)"

        case ${EAPI:-0} in
                4|5)
                        REQUIRED_USE+=" || ( $(ruby_get_use_targets) )"
                        ;;
        esac
fi

_ruby_invoke_environment() {
        old_S=${S}
        case ${EAPI} in
                4|5)
                        if [ -z ${RUBY_S} ]; then
                                sub_S=${P}
                        else
                                sub_S=${RUBY_S}
                        fi
                        ;;
                *)
                        sub_S=${S#${WORKDIR}/}
                        ;;
        esac

        # Special case, for the always-lovely GitHub fetches. With this,
        # we allow the star glob to just expand to whatever directory it's
        # called.
        if [[ ${sub_S} = *"*"* ]]; then
                case ${EAPI} in
                        2|3)
                                #The old method of setting S depends on undefined package
                                # manager behaviour, so encourage upgrading to EAPI=4.
                                eqawarn "Using * expansion of S is deprecated. Use EAPI and RUBY_S instead."
                                ;;
                esac
                pushd "${WORKDIR}"/all &>/dev/null
                sub_S=$(eval ls -d ${sub_S} 2>/dev/null)
                popd &>/dev/null
        fi

        environment=$1; shift

        my_WORKDIR="${WORKDIR}"/${environment}
        S="${my_WORKDIR}"/"${sub_S}"

        if [[ -d "${S}" ]]; then
                pushd "$S" &>/dev/null
        elif [[ -d "${my_WORKDIR}" ]]; then
                pushd "${my_WORKDIR}" &>/dev/null
        else
                pushd "${WORKDIR}" &>/dev/null
        fi

        ebegin "Running ${_PHASE:-${EBUILD_PHASE}} phase for $environment"
        "$@"
        popd &>/dev/null

        S=${old_S}
}

_ruby_each_implementation() {
        local invoked=no
        for _ruby_implementation in ${USE_RUBY}; do
                # only proceed if it's requested
                use ruby_targets_${_ruby_implementation} || continue

                RUBY=$(ruby_implementation_command ${_ruby_implementation})
                invoked=yes

                if [[ -n "$1" ]]; then
                        _ruby_invoke_environment ${_ruby_implementation} "$@"
                fi

                unset RUBY
        done

        if [[ ${invoked} == "no" ]]; then
                eerror "You need to select at least one compatible Ruby installation target via RUBY_TARGETS in make.conf."
                eerror "Compatible targets for this package are: ${USE_RUBY}"
                eerror
                eerror "See http://www.gentoo.org/proj/en/prog_lang/ruby/index.xml#doc_chap3 for more information."
                eerror
                die "No compatible Ruby target selected."
        fi
}

# @FUNCTION: ruby-ng_pkg_setup
# @DESCRIPTION:
# Check whether at least one ruby target implementation is present.
ruby-ng_pkg_setup() {
        # This only checks that at least one implementation is present
        # before doing anything; by leaving the parameters empty we know
        # it's a special case.
        _ruby_each_implementation

        has ruby_targets_jruby ${IUSE} && use ruby_targets_jruby && java-pkg_setup-vm
}

# @FUNCTION: ruby-ng_src_unpack
# @DESCRIPTION:
# Unpack the source archive.
ruby-ng_src_unpack() {
        mkdir "${WORKDIR}"/all
        pushd "${WORKDIR}"/all &>/dev/null

        # We don't support an each-unpack, it's either all or nothing!
        if type all_ruby_unpack &>/dev/null; then
                _ruby_invoke_environment all all_ruby_unpack
        else
                [[ -n ${A} ]] && unpack ${A}
        fi

        popd &>/dev/null
}

_ruby_apply_patches() {
        for patch in "${RUBY_PATCHES[@]}"; do
                if [ -f "${patch}" ]; then
                        epatch "${patch}"
                elif [ -f "${FILESDIR}/${patch}" ]; then
                        epatch "${FILESDIR}/${patch}"
                else
                        die "Cannot find patch ${patch}"
                fi
        done

        # This is a special case: instead of executing just in the special
        # "all" environment, this will actually copy the effects on _all_
        # the other environments, and is thus executed before the copy
        type all_ruby_prepare &>/dev/null && all_ruby_prepare
}

_ruby_source_copy() {
        # Until we actually find a reason not to, we use hardlinks, this
        # should reduce the amount of disk space that is wasted by this.
        cp -prlP all ${_ruby_implementation} \
                || die "Unable to copy ${_ruby_implementation} environment"
}

# @FUNCTION: ruby-ng_src_prepare
# @DESCRIPTION:
# Apply patches and prepare versions for each ruby target
# implementation. Also carry out common clean up tasks.
ruby-ng_src_prepare() {
        # Way too many Ruby packages are prepared on OSX without removing
        # the extra data forks, we do it here to avoid repeating it for
        # almost every other ebuild.
        find . -name '._*' -delete

        _ruby_invoke_environment all _ruby_apply_patches

        _PHASE="source copy" \
                _ruby_each_implementation _ruby_source_copy

        if type each_ruby_prepare &>/dev/null; then
                _ruby_each_implementation each_ruby_prepare
        fi
}

# @FUNCTION: ruby-ng_src_configure
# @DESCRIPTION:
# Configure the package.
ruby-ng_src_configure() {
        if type each_ruby_configure &>/dev/null; then
                _ruby_each_implementation each_ruby_configure
        fi

        type all_ruby_configure &>/dev/null && \
                _ruby_invoke_environment all all_ruby_configure
}

# @FUNCTION: ruby-ng_src_compile
# @DESCRIPTION:
# Compile the package.
ruby-ng_src_compile() {
        if type each_ruby_compile &>/dev/null; then
                _ruby_each_implementation each_ruby_compile
        fi

        type all_ruby_compile &>/dev/null && \
                _ruby_invoke_environment all all_ruby_compile
}

# @FUNCTION: ruby-ng_src_test
# @DESCRIPTION:
# Run tests for the package.
ruby-ng_src_test() {
        if type each_ruby_test &>/dev/null; then
                _ruby_each_implementation each_ruby_test
        fi

        type all_ruby_test &>/dev/null && \
                _ruby_invoke_environment all all_ruby_test
}

_each_ruby_check_install() {
        local scancmd=scanelf
        # we have a Mach-O object here
        [[ ${CHOST} == *-darwin ]] && scancmd=scanmacho

        has "${EAPI}" 2 && ! use prefix && EPREFIX=

        local libruby_basename=$(${RUBY} -rrbconfig -e 'puts RbConfig::CONFIG["LIBRUBY_SO"]')
        local libruby_soname=$(basename $(${scancmd} -F "%S#F" -qS "${EPREFIX}/usr/$(get_libdir)/${libruby_basename}") 2>/dev/null)
        local sitedir=$(${RUBY} -rrbconfig -e 'puts RbConfig::CONFIG["sitedir"]')
        local sitelibdir=$(${RUBY} -rrbconfig -e 'puts RbConfig::CONFIG["sitelibdir"]')

        # Look for wrong files in sitedir
        # if [[ -d "${D}${sitedir}" ]]; then
        #       local f=$(find "${D}${sitedir}" -mindepth 1 -maxdepth 1 -not -wholename "${D}${sitelibdir}")
        #       if [[ -n ${f} ]]; then
        #               eerror "Found files in sitedir, outsite sitelibdir:"
        #               eerror "${f}"
        #               die "Misplaced files in sitedir"
        #       fi
        # fi

        # The current implementation lacks libruby (i.e.: jruby)
        [[ -z ${libruby_soname} ]] && return 0

        # Check also the gems directory, since we could be installing compiled
        # extensions via ruby-fakegem; make sure to check only in sitelibdir, since
        # that's what changes between two implementations (otherwise you'd get false
        # positives now that Ruby 1.9.2 installs with the same sitedir as 1.8)
        ${scancmd} -qnR "${D}${sitelibdir}" "${D}${sitelibdir/site_ruby/gems}" \
                | fgrep -v "${libruby_soname}" \
                | grep -E -v "${RUBY_QA_ALLOWED_LIBS}" \
                > "${T}"/ruby-ng-${_ruby_implementation}-mislink.log

        if [[ -s "${T}"/ruby-ng-${_ruby_implementation}-mislink.log ]]; then
                ewarn "Extensions installed for ${_ruby_implementation} with missing links to ${libruby_soname}"
                ewarn $(< "${T}"/ruby-ng-${_ruby_implementation}-mislink.log )
                die "Missing links to ${libruby_soname}"
        fi
}

# @FUNCTION: ruby-ng_src_install
# @DESCRIPTION:
# Install the package for each ruby target implementation.
ruby-ng_src_install() {
        if type each_ruby_install &>/dev/null; then
                _ruby_each_implementation each_ruby_install
        fi

        type all_ruby_install &>/dev/null && \
                _ruby_invoke_environment all all_ruby_install

        _PHASE="check install" \
                _ruby_each_implementation _each_ruby_check_install
}

# @FUNCTION: ruby_rbconfig_value
# @USAGE: rbconfig item
# @RETURN: Returns the value of the given rbconfig item of the Ruby interpreter in ${RUBY}.
ruby_rbconfig_value() {
        echo $(${RUBY} -rrbconfig -e "puts RbConfig::CONFIG['$1']")
}

# @FUNCTION: doruby
# @USAGE: file [file...]
# @DESCRIPTION:
# Installs the specified file(s) into the sitelibdir of the Ruby interpreter in ${RUBY}.
doruby() {
        [[ -z ${RUBY} ]] && die "\$RUBY is not set"
        has "${EAPI}" 2 && ! use prefix && EPREFIX=
        ( # don't want to pollute calling env
                sitelibdir=$(ruby_rbconfig_value 'sitelibdir')
                insinto ${sitelibdir#${EPREFIX}}
                insopts -m 0644
                doins "$@"
        ) || die "failed to install $@"
}

# @FUNCTION: ruby_get_libruby
# @RETURN: The location of libruby*.so belonging to the Ruby interpreter in ${RUBY}.
ruby_get_libruby() {
        ${RUBY} -rrbconfig -e 'puts File.join(RbConfig::CONFIG["libdir"], RbConfig::CONFIG["LIBRUBY"])'
}

# @FUNCTION: ruby_get_hdrdir
# @RETURN: The location of the header files belonging to the Ruby interpreter in ${RUBY}.
ruby_get_hdrdir() {
        local rubyhdrdir=$(ruby_rbconfig_value 'rubyhdrdir')

        if [[ "${rubyhdrdir}" = "nil" ]] ; then
                rubyhdrdir=$(ruby_rbconfig_value 'archdir')
        fi

        echo "${rubyhdrdir}"
}

# @FUNCTION: ruby_get_version
# @RETURN: The version of the Ruby interpreter in ${RUBY}, or what 'ruby' points to.
ruby_get_version() {
        local ruby=${RUBY:-$(type -p ruby 2>/dev/null)}

        echo $(${ruby} -e 'puts RUBY_VERSION')
}

# @FUNCTION: ruby_get_implementation
# @RETURN: The implementation of the Ruby interpreter in ${RUBY}, or what 'ruby' points to.
ruby_get_implementation() {
        local ruby=${RUBY:-$(type -p ruby 2>/dev/null)}

        case $(${ruby} --version) in
                *Enterprise*)
                        echo "ree"
                        ;;
                *jruby*)
                        echo "jruby"
                        ;;
                *rubinius*)
                        echo "rbx"
                        ;;
                *)
                        echo "mri"
                        ;;
        esac
}

# @FUNCTION: ruby-ng_rspec
# @DESCRIPTION:
# This is simply a wrapper around the rspec command (executed by $RUBY})
# which also respects TEST_VERBOSE and NOCOLOR environment variables.
ruby-ng_rspec() {
        if [[ ${DEPEND} != *"dev-ruby/rspec"* ]]; then
                ewarn "Missing dev-ruby/rspec in \${DEPEND}"
        fi

        local rspec_params=
        case ${NOCOLOR} in
                1|yes|true)
                        rspec_params+=" --no-color"
                        ;;
                *)
                        rspec_params+=" --color"
                        ;;
        esac

        case ${TEST_VERBOSE} in
                1|yes|true)
                        rspec_params+=" --format documentation"
                        ;;
                *)
                        rspec_params+=" --format progress"
                        ;;
        esac

        ${RUBY} -S rspec ${rspec_params} "$@" || die "rspec failed"
}

# @FUNCTION: ruby-ng_cucumber
# @DESCRIPTION:
# This is simply a wrapper around the cucumber command (executed by $RUBY})
# which also respects TEST_VERBOSE and NOCOLOR environment variables.
ruby-ng_cucumber() {
        if [[ ${DEPEND} != *"dev-util/cucumber"* ]]; then
                ewarn "Missing dev-util/cucumber in \${DEPEND}"
        fi

        local cucumber_params=
        case ${NOCOLOR} in
                1|yes|true)
                        cucumber_params+=" --no-color"
                        ;;
                *)
                        cucumber_params+=" --color"
                        ;;
        esac

        case ${TEST_VERBOSE} in
                1|yes|true)
                        cucumber_params+=" --format pretty"
                        ;;
                *)
                        cucumber_params+=" --format progress"
                        ;;
        esac

        if [[ ${RUBY} == *jruby ]]; then
                ewarn "Skipping cucumber tests on JRuby (unsupported)."
                return 0
        fi

        ${RUBY} -S cucumber ${cucumber_params} "$@" || die "cucumber failed"
}

# @FUNCTION: ruby-ng_testrb-2
# @DESCRIPTION:
# This is simply a replacement for the testrb command that load the test
# files and execute them, with test-unit 2.x. This actually requires
# either an old test-unit-2 version or 2.5.1-r1 or later, as they remove
# their script and we installed a broken wrapper for a while.
# This also respects TEST_VERBOSE and NOCOLOR environment variables.
ruby-ng_testrb-2() {
        if [[ ${DEPEND} != *"dev-ruby/test-unit"* ]]; then
                ewarn "Missing dev-ruby/test-unit in \${DEPEND}"
        fi

        local testrb_params=
        case ${NOCOLOR} in
                1|yes|true)
                        testrb_params+=" --no-use-color"
                        ;;
                *)
                        testrb_params+=" --use-color=auto"
                        ;;
        esac

        case ${TEST_VERBOSE} in
                1|yes|true)
                        testrb_params+=" --verbose=verbose"
                        ;;
                *)
                        testrb_params+=" --verbose=normal"
                        ;;
        esac

        ${RUBY} -S testrb-2 ${testrb_params} "$@" || die "testrb-2 failed"
}