# Copyright 1999-2019 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

# @ECLASS: distutils-r1.eclass
# @MAINTAINER:
# Python team <python@gentoo.org>
# @AUTHOR:
# Author: Michał Górny <mgorny@gentoo.org>
# Based on the work of: Krzysztof Pawlik <nelchael@gentoo.org>
# @SUPPORTED_EAPIS: 5 6 7
# @BLURB: A simple eclass to build Python packages using distutils.
# @DESCRIPTION:
# A simple eclass providing functions to build Python packages using
# the distutils build system. It exports phase functions for all
# the src_* phases. Each of the phases runs two pseudo-phases:
# python_..._all() (e.g. python_prepare_all()) once in ${S}, then
# python_...() (e.g. python_prepare()) for each implementation
# (see: python_foreach_impl() in python-r1).
#
# In distutils-r1_src_prepare(), the 'all' function is run before
# per-implementation ones (because it creates the implementations),
# per-implementation functions are run in a random order.
#
# In remaining phase functions, the per-implementation functions are run
# before the 'all' one, and they are ordered from the least to the most
# preferred implementation (so that 'better' files overwrite 'worse'
# ones).
#
# If the ebuild doesn't specify a particular pseudo-phase function,
# the default one will be used (distutils-r1_...). Defaults are provided
# for all per-implementation pseudo-phases, python_prepare_all()
# and python_install_all(); whenever writing your own pseudo-phase
# functions, you should consider calling the defaults (and especially
# distutils-r1_python_prepare_all).
#
# Please note that distutils-r1 sets RDEPEND and DEPEND unconditionally
# for you.
#
# Also, please note that distutils-r1 will always inherit python-r1
# as well. Thus, all the variables defined and documented there are
# relevant to the packages using distutils-r1.
#
# For more information, please see the wiki:
# https://wiki.gentoo.org/wiki/Project:Python/distutils-r1

case "${EAPI:-0}" in
	0|1|2|3|4)
		die "Unsupported EAPI=${EAPI:-0} (too old) for ${ECLASS}"
		;;
	5|6|7)
		;;
	*)
		die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}"
		;;
esac

# @ECLASS-VARIABLE: DISTUTILS_OPTIONAL
# @DEFAULT_UNSET
# @DESCRIPTION:
# If set to a non-null value, distutils part in the ebuild will
# be considered optional. No dependencies will be added and no phase
# functions will be exported.
#
# If you enable DISTUTILS_OPTIONAL, you have to set proper dependencies
# for your package (using ${PYTHON_DEPS}) and to either call
# distutils-r1 default phase functions or call the build system
# manually.

# @ECLASS-VARIABLE: DISTUTILS_SINGLE_IMPL
# @DEFAULT_UNSET
# @DESCRIPTION:
# If set to a non-null value, the ebuild will support setting a single
# Python implementation only. It will effectively replace the python-r1
# eclass inherit with python-single-r1.
#
# Note that inheriting python-single-r1 will cause pkg_setup()
# to be exported. It must be run in order for the eclass functions
# to function properly.

# @ECLASS-VARIABLE: DISTUTILS_USE_PEP517
# @PRE_INHERIT
# @DEFAULT_UNSET
# @DESCRIPTION:
# Enable the PEP 517 mode for the specified build system.  In this mode,
# the complete build and install is done in python_compile(),
# a venv-style install tree is provided to python_test(),
# and python_install() just merges the temporary install tree
# into the real fs.
#
# This mode is recommended for Python packages.  However, some packages
# using custom hacks on top of distutils/setuptools may not install
# correctly in this mode.  Please verify the list of installed files
# when using it.
#
# The variable specifies the build system used.  Currently,
# the following values are supported:
#
# - flit - flit_core backend
#
# - flit_scm - flit_scm backend
#
# - hatchling - hatchling backend (from hatch)
#
# - jupyter - jupyter_packaging backend
#
# - maturin - maturin backend
#
# - meson-python - meson-python (mesonpy) backend
#
# - no - no PEP517 build system (see below)
#
# - pbr - pbr backend
#
# - pdm - pdm.pep517 backend
#
# - poetry - poetry-core backend
#
# - setuptools - distutils or setuptools (incl. legacy mode)
#
# - sip - sipbuild backend
#
# - standalone - standalone build systems without external deps
#   (used for bootstrapping).
#
# The variable needs to be set before the inherit line.  The eclass
# adds appropriate build-time dependencies and verifies the value.
#
# The special value "no" indicates that the package has no build system.
# This is not equivalent to unset DISTUTILS_USE_PEP517 (legacy mode).
# It causes the eclass not to include any build system dependencies
# and to disable default python_compile() and python_install()
# implementations.  Baseline Python deps and phase functions will still
# be set (depending on the value of DISTUTILS_OPTIONAL).  Most of
# the other eclass functions will work.  Testing venv will be provided
# in ${BUILD_DIR}/install after python_compile(), and if any (other)
# files are found in ${BUILD_DIR}/install after python_install(), they
# will be merged into ${D}.

# @ECLASS-VARIABLE: DISTUTILS_USE_SETUPTOOLS
# @PRE_INHERIT
# @DESCRIPTION:
# Controls adding dev-python/setuptools dependency.  The allowed values
# are:
#
# - no -- do not add the dependency (pure distutils package)
# - bdepend -- add it to BDEPEND (the default)
# - rdepend -- add it to BDEPEND+RDEPEND (when using entry_points)
# - manual -- do not add the depedency and suppress the checks
#             (assumes you will take care of doing it correctly)
#
# This variable is effective only if DISTUTILS_OPTIONAL is disabled.
# It is available only in non-PEP517 mode.  It needs to be set before
# the inherit line.

# @ECLASS-VARIABLE: DISTUTILS_DEPS
# @OUTPUT_VARIABLE
# @DESCRIPTION:
# This is an eclass-generated build-time dependency string for the build
# system packages.  This string is automatically appended to BDEPEND
# unless DISTUTILS_OPTIONAL is used.  This variable is available only
# in PEP 517 mode.
#
# Example use:
# @CODE
# DISTUTILS_OPTIONAL=1
# # ...
# RDEPEND="${PYTHON_DEPS}"
# BDEPEND="
#     ${PYTHON_DEPS}
#     ${DISTUTILS_DEPS}"
# @CODE

if [[ ! ${_DISTUTILS_R1} ]]; then

[[ ${EAPI} == [456] ]] && inherit eutils
[[ ${EAPI} == [56] ]] && inherit xdg-utils
inherit multiprocessing toolchain-funcs

if [[ ! ${DISTUTILS_SINGLE_IMPL} ]]; then
	inherit python-r1
else
	inherit python-single-r1
fi

fi

if [[ ! ${DISTUTILS_OPTIONAL} ]]; then
	EXPORT_FUNCTIONS src_prepare src_configure src_compile src_test src_install
fi

if [[ ! ${_DISTUTILS_R1} ]]; then

_distutils_set_globals() {
	local rdep=${PYTHON_DEPS}
	local bdep=${rdep}

	if [[ ${DISTUTILS_USE_PEP517} ]]; then
		if [[ ${DISTUTILS_USE_SETUPTOOLS} ]]; then
			echo "${DISTUTILS_USE_PEP517}/${DISTUTILS_USE_SETUPTOOLS}"
			die "DISTUTILS_USE_SETUPTOOLS is not used in PEP517 mode"
		fi

		bdep+="
			>=dev-python/gpep517-9[${PYTHON_USEDEP}]
		"
		case ${DISTUTILS_USE_PEP517} in
			flit)
				bdep+="
					>=dev-python/flit_core-3.8.0[${PYTHON_USEDEP}]
				"
				;;
			flit_scm)
				bdep+="
					>=dev-python/flit_scm-1.7.0[${PYTHON_USEDEP}]
				"
				;;
			hatchling)
				bdep+="
					>=dev-python/hatchling-1.11.1[${PYTHON_USEDEP}]
				"
				;;
			jupyter)
				bdep+="
					>=dev-python/jupyter_packaging-0.12.3[${PYTHON_USEDEP}]
				"
				;;
			maturin)
				bdep+="
					>=dev-util/maturin-0.13.7[${PYTHON_USEDEP}]
				"
				;;
			no)
				# undo the generic deps added above
				bdep=${rdep}
				;;
			meson-python)
				bdep+="
					>=dev-python/meson-python-0.11.0[${PYTHON_USEDEP}]
				"
				;;
			pbr)
				bdep+="
					>=dev-python/pbr-5.11.0[${PYTHON_USEDEP}]
				"
				;;
			pdm)
				bdep+="
					>=dev-python/pdm-pep517-1.0.5[${PYTHON_USEDEP}]
				"
				;;
			poetry)
				bdep+="
					>=dev-python/poetry-core-1.3.2[${PYTHON_USEDEP}]
				"
				;;
			setuptools)
				bdep+="
					>=dev-python/setuptools-65.5.1[${PYTHON_USEDEP}]
					>=dev-python/wheel-0.38.4[${PYTHON_USEDEP}]
				"
				;;
			sip)
				bdep+="
					>=dev-python/sip-6.7.5[${PYTHON_USEDEP}]
				"
				;;
			standalone)
				;;
			*)
				die "Unknown DISTUTILS_USE_PEP517=${DISTUTILS_USE_PEP517}"
				;;
		esac
	else
		case ${DISTUTILS_USE_SETUPTOOLS:-bdepend} in
			no|manual)
				;;
			bdepend)
				bdep+=" dev-python/setuptools[${PYTHON_USEDEP}]"
				;;
			rdepend)
				bdep+=" dev-python/setuptools[${PYTHON_USEDEP}]"
				rdep+=" dev-python/setuptools[${PYTHON_USEDEP}]"
				;;
			*)
				die "Invalid DISTUTILS_USE_SETUPTOOLS=${DISTUTILS_USE_SETUPTOOLS}"
				;;
		esac
	fi

	RDEPEND=${rdep}
	if [[ ${EAPI} != [56] ]]; then
		BDEPEND=${bdep}
	else
		DEPEND=${bdep}
	fi
	REQUIRED_USE=${PYTHON_REQUIRED_USE}
}
[[ ! ${DISTUTILS_OPTIONAL} ]] && _distutils_set_globals
unset -f _distutils_set_globals

# @ECLASS-VARIABLE: PATCHES
# @DEFAULT_UNSET
# @DESCRIPTION:
# An array containing patches to be applied to the sources before
# copying them.
#
# If unset, no custom patches will be applied.
#
# Please note, however, that at some point the eclass may apply
# additional distutils patches/quirks independently of this variable.
#
# Example:
# @CODE
# PATCHES=( "${FILESDIR}"/${P}-make-gentoo-happy.patch )
# @CODE

# @ECLASS-VARIABLE: DOCS
# @DEFAULT_UNSET
# @DESCRIPTION:
# An array containing documents installed using dodoc. The files listed
# there must exist in the directory from which
# distutils-r1_python_install_all() is run (${S} by default).
#
# If unset, the function will instead look up files matching default
# filename pattern list (from the Package Manager Specification),
# and install those found.
#
# Example:
# @CODE
# DOCS=( NEWS README )
# @CODE

# @ECLASS-VARIABLE: HTML_DOCS
# @DEFAULT_UNSET
# @DESCRIPTION:
# An array containing documents installed using dohtml. The files
# and directories listed there must exist in the directory from which
# distutils-r1_python_install_all() is run (${S} by default).
#
# If unset, no HTML docs will be installed.
#
# Example:
# @CODE
# HTML_DOCS=( doc/html/. )
# @CODE

# @ECLASS-VARIABLE: EXAMPLES
# @DEFAULT_UNSET
# @DESCRIPTION:
# OBSOLETE: this variable is deprecated and banned in EAPI 6
#
# An array containing examples installed into 'examples' doc
# subdirectory. The files and directories listed there must exist
# in the directory from which distutils-r1_python_install_all() is run
# (${S} by default).
#
# The 'examples' subdirectory will be marked not to be compressed
# automatically.
#
# If unset, no examples will be installed.
#
# Example:
# @CODE
# EXAMPLES=( examples/. demos/. )
# @CODE

# @ECLASS-VARIABLE: DISTUTILS_IN_SOURCE_BUILD
# @DEFAULT_UNSET
# @DESCRIPTION:
# If set to a non-null value, in-source builds will be enabled.
# If unset, the default is to use in-source builds when python_prepare()
# is declared, and out-of-source builds otherwise.
#
# If in-source builds are used, the eclass will create a copy of package
# sources for each Python implementation in python_prepare_all(),
# and work on that copy afterwards.
#
# If out-of-source builds are used, the eclass will instead work
# on the sources directly, prepending setup.py arguments with
# 'build --build-base ${BUILD_DIR}' to enforce keeping & using built
# files in the specific root.

# @ECLASS-VARIABLE: DISTUTILS_ALL_SUBPHASE_IMPLS
# @DEFAULT_UNSET
# @DESCRIPTION:
# An array of patterns specifying which implementations can be used
# for *_all() sub-phase functions. If undefined, defaults to '*'
# (allowing any implementation). If multiple values are specified,
# implementations matching any of the patterns will be accepted.
#
# The patterns can be either fnmatch-style patterns (matched via bash
# == operator against PYTHON_COMPAT values) or '-2' / '-3' to indicate
# appropriately all enabled Python 2/3 implementations (alike
# python_is_python3). Remember to escape or quote the fnmatch patterns
# to prevent accidental shell filename expansion.
#
# If the restriction needs to apply conditionally to a USE flag,
# the variable should be set conditionally as well (e.g. in an early
# phase function or other convenient location).
#
# Please remember to add a matching || block to REQUIRED_USE,
# to ensure that at least one implementation matching the patterns will
# be enabled.
#
# Example:
# @CODE
# REQUIRED_USE="doc? ( || ( $(python_gen_useflags 'python2*') ) )"
#
# pkg_setup() {
#     use doc && DISTUTILS_ALL_SUBPHASE_IMPLS=( 'python2*' )
# }
# @CODE

# @ECLASS-VARIABLE: mydistutilsargs
# @DEFAULT_UNSET
# @DESCRIPTION:
# An array containing options to be passed to setup.py.
#
# Example:
# @CODE
# python_configure_all() {
# 	mydistutilsargs=( --enable-my-hidden-option )
# }
# @CODE

# @FUNCTION: distutils_enable_sphinx
# @USAGE: <subdir> [--no-autodoc | <plugin-pkgs>...]
# @DESCRIPTION:
# Set up IUSE, BDEPEND, python_check_deps() and python_compile_all() for
# building HTML docs via dev-python/sphinx.  python_compile_all() will
# append to HTML_DOCS if docs are enabled.
#
# This helper is meant for the most common case, that is a single Sphinx
# subdirectory with standard layout, building and installing HTML docs
# behind USE=doc.  It assumes it's the only consumer of the three
# aforementioned functions.  If you need to use a custom implemention,
# you can't use it.
#
# If your package uses additional Sphinx plugins, they should be passed
# (without PYTHON_USEDEP) as <plugin-pkgs>.  The function will take care
# of setting appropriate any-of dep and python_check_deps().
#
# If no plugin packages are specified, the eclass will still utilize
# any-r1 API to support autodoc (documenting source code).
# If the package uses neither autodoc nor additional plugins, you should
# pass --no-autodoc to disable this API and simplify the resulting code.
#
# This function must be called in global scope.  Take care not to
# overwrite the variables set by it.  If you need to extend
# python_compile_all(), you can call the original implementation
# as sphinx_compile_all.
distutils_enable_sphinx() {
	debug-print-function ${FUNCNAME} "${@}"
	[[ ${#} -ge 1 ]] || die "${FUNCNAME} takes at least one arg: <subdir>"

	_DISTUTILS_SPHINX_SUBDIR=${1}
	shift
	_DISTUTILS_SPHINX_PLUGINS=( "${@}" )

	local deps autodoc=1 d
	for d; do
		if [[ ${d} == --no-autodoc ]]; then
			autodoc=
		else
			deps+="
				${d}[\${PYTHON_USEDEP}]"
		fi
	done

	if [[ ! ${autodoc} && -n ${deps} ]]; then
		die "${FUNCNAME}: do not pass --no-autodoc if external plugins are used"
	fi
	if [[ ${autodoc} ]]; then
		deps="$(python_gen_any_dep "
			dev-python/sphinx[\${PYTHON_USEDEP}]
			${deps}")"

		python_check_deps() {
			use doc || return 0
			local p
			for p in dev-python/sphinx "${_DISTUTILS_SPHINX_PLUGINS[@]}"; do
				has_version "${p}[${PYTHON_USEDEP}]" || return 1
			done
		}
	else
		deps="dev-python/sphinx"
	fi

	sphinx_compile_all() {
		use doc || return

		local confpy=${_DISTUTILS_SPHINX_SUBDIR}/conf.py
		[[ -f ${confpy} ]] ||
			die "${confpy} not found, distutils_enable_sphinx call wrong"

		if [[ ${_DISTUTILS_SPHINX_PLUGINS[0]} == --no-autodoc ]]; then
			if grep -F -q 'sphinx.ext.autodoc' "${confpy}"; then
				die "distutils_enable_sphinx: --no-autodoc passed but sphinx.ext.autodoc found in ${confpy}"
			fi
		else
			if ! grep -F -q 'sphinx.ext.autodoc' "${confpy}"; then
				die "distutils_enable_sphinx: sphinx.ext.autodoc not found in ${confpy}, pass --no-autodoc"
			fi
		fi

		build_sphinx "${_DISTUTILS_SPHINX_SUBDIR}"
	}
	python_compile_all() { sphinx_compile_all; }

	IUSE+=" doc"
	if [[ ${EAPI} == [56] ]]; then
		DEPEND+=" doc? ( ${deps} )"
	else
		BDEPEND+=" doc? ( ${deps} )"
	fi

	# we need to ensure successful return in case we're called last,
	# otherwise Portage may wrongly assume sourcing failed
	return 0
}

# @FUNCTION: distutils_enable_tests
# @USAGE: <test-runner>
# @DESCRIPTION:
# Set up IUSE, RESTRICT, BDEPEND and python_test() for running tests
# with the specified test runner.  Also copies the current value
# of RDEPEND to test?-BDEPEND.  The test-runner argument must be one of:
#
# - nose: nosetests (dev-python/nose)
# - pytest: dev-python/pytest
# - setup.py: setup.py test (no deps included)
# - unittest: for built-in Python unittest module
#
# This function is meant as a helper for common use cases, and it only
# takes care of basic setup.  You still need to list additional test
# dependencies manually.  If you have uncommon use case, you should
# not use it and instead enable tests manually.
#
# This function must be called in global scope, after RDEPEND has been
# declared.  Take care not to overwrite the variables set by it.
distutils_enable_tests() {
	debug-print-function ${FUNCNAME} "${@}"
	[[ ${#} -eq 1 ]] || die "${FUNCNAME} takes exactly one argument: test-runner"

	local test_deps
	case ${1} in
		nose)
			test_deps="dev-python/nose[${PYTHON_USEDEP}]"
			python_test() {
				nosetests -v || die "Tests fail with ${EPYTHON}"
			}
			;;
		pytest)
			test_deps="dev-python/pytest[${PYTHON_USEDEP}]"
			python_test() {
				pytest -vv || die "Tests fail with ${EPYTHON}"
			}
			;;
		setup.py)
			python_test() {
				esetup.py test --verbose
			}
			;;
		unittest)
			python_test() {
				"${EPYTHON}" -m unittest discover -v ||
					die "Tests fail with ${EPYTHON}"
			}
			;;
		*)
			die "${FUNCNAME}: unsupported argument: ${1}"
	esac

	local rdep="${RDEPEND##*( )}"
	if [[ -n ${test_deps} || -n ${rdep} ]]; then
		IUSE+=" test"
		RESTRICT+=" !test? ( test )"
		if [[ ${EAPI} == [56] ]]; then
			DEPEND+=" test? ( ${test_deps} ${rdep} )"
		else
			BDEPEND+=" test? ( ${test_deps} ${rdep} )"
		fi
	fi

	# we need to ensure successful return in case we're called last,
	# otherwise Portage may wrongly assume sourcing failed
	return 0
}

# @FUNCTION: _distutils-r1_verify_use_setuptools
# @INTERNAL
# @DESCRIPTION:
# Check setup.py for signs that DISTUTILS_USE_SETUPTOOLS have been set
# incorrectly.
_distutils_verify_use_setuptools() {
	[[ ${DISTUTILS_USE_PEP517} ]] && return
	[[ ${DISTUTILS_OPTIONAL} ]] && return
	[[ ${DISTUTILS_USE_SETUPTOOLS} == manual ]] && return

	# ok, those are cheap greps.  we can try toimprove them if we hit
	# false positives.
	local expected=no
	if [[ ${CATEGORY}/${PN} == dev-python/setuptools ]]; then
		# as a special case, setuptools provides itself ;-)
		:
	elif grep -E -q -s '(from|import)\s+setuptools' setup.py; then
		if grep -E -q -s 'entry_points\s*=' setup.py; then
			expected=rdepend
		elif grep -F -q -s '[options.entry_points]' setup.cfg; then
			expected=rdepend
		else
			expected=bdepend
		fi
	fi

	if [[ ${DISTUTILS_USE_SETUPTOOLS} != ${expected} ]]; then
		if [[ ! ${_DISTUTILS_SETUPTOOLS_WARNED} ]]; then
			_DISTUTILS_SETUPTOOLS_WARNED=1
			local def=
			[[ ${DISTUTILS_USE_SETUPTOOLS} == bdepend ]] && def=' (default?)'

			eqawarn "DISTUTILS_USE_SETUPTOOLS value is probably incorrect"
			eqawarn "  value:    DISTUTILS_USE_SETUPTOOLS=${DISTUTILS_USE_SETUPTOOLS}${def}"
			eqawarn "  expected: DISTUTILS_USE_SETUPTOOLS=${expected}"
		fi
	fi
}

# @FUNCTION: esetup.py
# @USAGE: [<args>...]
# @DESCRIPTION:
# Run setup.py using currently selected Python interpreter
# (if ${EPYTHON} is set; fallback 'python' otherwise).
#
# setup.py will be passed the following, in order:
# 1. ${mydistutilsargs[@]}
# 2. additional arguments passed to the esetup.py function.
#
# Please note that setup.py will respect defaults (unless overridden
# via command-line options) from setup.cfg that is created
# in distutils-r1_python_compile and in distutils-r1_python_install.
#
# This command dies on failure.
esetup.py() {
	debug-print-function ${FUNCNAME} "${@}"

	local die_args=()
	[[ ${EAPI} != [45] ]] && die_args+=( -n )

	if [[ ${BUILD_DIR} && ! ${DISTUTILS_USE_PEP517} ]]; then
		_distutils-r1_create_setup_cfg
	fi
	_distutils_verify_use_setuptools

	echo $(pwd)
	local setup_py=( setup.py )
	if [[ ! -f setup.py ]]; then
		if [[ ! -f setup.cfg ]]; then
			die "${FUNCNAME}: setup.py nor setup.cfg not found"
		fi
		setup_py=( -c "from setuptools import setup; setup()" )
	fi

	set -- "${EPYTHON:-python}" "${setup_py[@]}" "${mydistutilsargs[@]}" "${@}"

	echo "${@}" >&2
	"${@}" || die "${die_args[@]}"
	local ret=${?}

	if [[ ${BUILD_DIR} && ! ${DISTUTILS_USE_PEP517} ]]; then
		rm "${HOME}"/.pydistutils.cfg || die "${die_args[@]}"
	fi

	return ${ret}
}

# @FUNCTION: distutils_install_for_testing
# @USAGE: [<args>...]
# @DESCRIPTION:
# Install the package into a temporary location for running tests.
# Update PYTHONPATH appropriately and set TEST_DIR to the test
# installation root. The Python packages will be installed in 'lib'
# subdir, and scripts in 'scripts' subdir (like in BUILD_DIR).
#
# Please note that this function should be only used if package uses
# namespaces (and therefore proper install needs to be done to enforce
# PYTHONPATH) or tests rely on the results of install command.
# For most of the packages, tests built in BUILD_DIR are good enough.
distutils_install_for_testing() {
	debug-print-function ${FUNCNAME} "${@}"

	if [[ ${DISTUTILS_USE_PEP517} ]]; then
		die "${FUNCNAME} is not implemented in PEP517 mode"
	fi

	# A few notes:
	# 1) because of namespaces, we can't use 'install --root',
	# 2) 'install --home' is terribly broken on pypy, so we need
	#    to override --install-lib and --install-scripts,
	# 3) non-root 'install' complains about PYTHONPATH and missing dirs,
	#    so we need to set it properly and mkdir them,
	# 4) it runs a bunch of commands which write random files to cwd,
	#    in order to avoid that, we add the necessary path overrides
	#    in _distutils-r1_create_setup_cfg.

	TEST_DIR=${BUILD_DIR}/test
	local bindir=${TEST_DIR}/scripts
	local libdir=${TEST_DIR}/lib
	PYTHONPATH=${libdir}:${PYTHONPATH}

	local add_args=(
		install
			--home="${TEST_DIR}"
			--install-lib="${libdir}"
			--install-scripts="${bindir}"
	)

	mkdir -p "${libdir}" || die
	esetup.py "${add_args[@]}" "${@}"
}

# @FUNCTION: _distutils-r1_disable_ez_setup
# @INTERNAL
# @DESCRIPTION:
# Stub out ez_setup.py and distribute_setup.py to prevent packages
# from trying to download a local copy of setuptools.
_distutils-r1_disable_ez_setup() {
	if [[ ${DISTUTILS_USE_PEP517} ]]; then
		die "${FUNCNAME} is not implemented in PEP517 mode"
	fi

	local stub="def use_setuptools(*args, **kwargs): pass"
	if [[ -f ez_setup.py ]]; then
		echo "${stub}" > ez_setup.py || die
	fi
	if [[ -f distribute_setup.py ]]; then
		echo "${stub}" > distribute_setup.py || die
	fi
}

# @FUNCTION: distutils-r1_python_prepare_all
# @DESCRIPTION:
# The default python_prepare_all(). It applies the patches from PATCHES
# array, then user patches and finally calls python_copy_sources to
# create copies of resulting sources for each Python implementation.
#
# At some point in the future, it may also apply eclass-specific
# distutils patches and/or quirks.
distutils-r1_python_prepare_all() {
	debug-print-function ${FUNCNAME} "${@}"

	if [[ ! ${DISTUTILS_OPTIONAL} ]]; then
		if [[ ${EAPI} != [45] ]]; then
			default
		else
			[[ ${PATCHES} ]] && epatch "${PATCHES[@]}"
			epatch_user
		fi
	fi

	# by default, use in-source build if python_prepare() is used
	if [[ ! ${DISTUTILS_IN_SOURCE_BUILD+1} ]]; then
		if declare -f python_prepare >/dev/null; then
			DISTUTILS_IN_SOURCE_BUILD=1
		fi
	fi

	if [[ ! ${DISTUTILS_USE_PEP517} ]]; then
		_distutils-r1_disable_ez_setup
	fi

	if [[ ${DISTUTILS_IN_SOURCE_BUILD} && ! ${DISTUTILS_SINGLE_IMPL} ]]
	then
		# create source copies for each implementation
		python_copy_sources
	fi

	_DISTUTILS_DEFAULT_CALLED=1
}

# @FUNCTION: distutils-r1_python_prepare
# @DESCRIPTION:
# The default python_prepare(). A no-op.
distutils-r1_python_prepare() {
	debug-print-function ${FUNCNAME} "${@}"

	[[ ${EAPI} == [45] ]] || die "${FUNCNAME} is banned in EAPI 6 (it was a no-op)"
}

# @FUNCTION: distutils-r1_python_configure
# @DESCRIPTION:
# The default python_configure(). A no-op.
distutils-r1_python_configure() {
	debug-print-function ${FUNCNAME} "${@}"

	[[ ${EAPI} == [45] ]] || die "${FUNCNAME} is banned in EAPI 6 (it was a no-op)"
}

# @FUNCTION: _distutils-r1_create_setup_cfg
# @INTERNAL
# @DESCRIPTION:
# Create implementation-specific configuration file for distutils,
# setting proper build-dir (and install-dir) paths.
_distutils-r1_create_setup_cfg() {
	if [[ ${DISTUTILS_USE_PEP517} ]]; then
		die "${FUNCNAME} is not implemented in PEP517 mode"
	fi

	cat > "${HOME}"/.pydistutils.cfg <<-_EOF_ || die
		[build]
		build-base = ${BUILD_DIR}

		# using a single directory for them helps us export
		# ${PYTHONPATH} and ebuilds find the sources independently
		# of whether the package installs extensions or not
		#
		# note: due to some packages (wxpython) relying on separate
		# platlib & purelib dirs, we do not set --build-lib (which
		# can not be overridden with --build-*lib)
		build-platlib = %(build-base)s/lib
		build-purelib = %(build-base)s/lib

		# make the ebuild writer lives easier
		build-scripts = %(build-base)s/scripts

		# this is needed by distutils_install_for_testing since
		# setuptools like to create .egg files for install --home.
		[bdist_egg]
		dist-dir = ${BUILD_DIR}/dist
	_EOF_

	# we can't refer to ${D} before src_install()
	if [[ ${EBUILD_PHASE} == install ]]; then
		cat >> "${HOME}"/.pydistutils.cfg <<-_EOF_ || die

			# installation paths -- allow calling extra install targets
			# without the default 'install'
			[install]
			compile = True
			optimize = 2
			root = ${D%/}
		_EOF_

		if [[ ! ${DISTUTILS_SINGLE_IMPL} ]]; then
			cat >> "${HOME}"/.pydistutils.cfg <<-_EOF_ || die
				install-scripts = $(python_get_scriptdir)
			_EOF_
		fi
	fi
}

# @FUNCTION: _distutils-r1_copy_egg_info
# @INTERNAL
# @DESCRIPTION:
# Copy egg-info files to the ${BUILD_DIR} (that's going to become
# egg-base in esetup.py). This way, we respect whatever's in upstream
# egg-info.
_distutils-r1_copy_egg_info() {
	if [[ ${DISTUTILS_USE_PEP517} ]]; then
		die "${FUNCNAME} is not implemented in PEP517 mode"
	fi

	mkdir -p "${BUILD_DIR}" || die
	# stupid freebsd can't do 'cp -t ${BUILD_DIR} {} +'
	find -name '*.egg-info' -type d -exec cp -R -p {} "${BUILD_DIR}"/ ';' || die
}

# @FUNCTION: _distutils-r1_backend_to_key
# @USAGE: <backend>
# @INTERNAL
# @DESCRIPTION:
# Print the DISTUTILS_USE_PEP517 value corresponding to the backend
# passed as the only argument.
_distutils-r1_backend_to_key() {
	debug-print-function ${FUNCNAME} "${@}"

	local backend=${1}
	case ${backend} in
		flit_core.buildapi|flit.buildapi)
			echo flit
			;;
		flit_scm:buildapi)
			echo flit_scm
			;;
		hatchling.build)
			echo hatchling
			;;
		jupyter_packaging.build_api)
			echo jupyter
			;;
		maturin)
			echo maturin
			;;
		mesonpy)
			echo meson-python
			;;
		pbr.build)
			echo pbr
			;;
		pdm.pep517.api)
			echo pdm
			;;
		poetry.core.masonry.api|poetry.masonry.api)
			echo poetry
			;;
		setuptools.build_meta|setuptools.build_meta:__legacy__)
			echo setuptools
			;;
		sipbuild.api)
			echo sip
			;;
		*)
			die "Unknown backend: ${backend}"
			;;
	esac
}

# @FUNCTION: _distutils-r1_get_backend
# @INTERNAL
# @DESCRIPTION:
# Read (or guess, in case of setuptools) the build-backend
# for the package in the current directory.
_distutils-r1_get_backend() {
	debug-print-function ${FUNCNAME} "${@}"

	local build_backend legacy_fallback
	if [[ -f pyproject.toml ]]; then
		# if pyproject.toml exists, try getting the backend from it
		# NB: this could fail if pyproject.toml doesn't list one
		build_backend=$(gpep517 get-backend)
	fi
	if [[ -z ${build_backend} && ${DISTUTILS_USE_PEP517} == setuptools &&
		-f setup.py ]]
	then
		# use the legacy setuptools backend as a fallback
		build_backend=setuptools.build_meta:__legacy__
		legacy_fallback=1
	fi
	if [[ -z ${build_backend} ]]; then
		die "Unable to obtain build-backend from pyproject.toml"
	fi

	if [[ ${DISTUTILS_USE_PEP517} != standalone ]]; then
		# verify whether DISTUTILS_USE_PEP517 was set correctly
		local expected_value=$(_distutils-r1_backend_to_key "${build_backend}")
		if [[ ${DISTUTILS_USE_PEP517} != ${expected_value} ]]; then
			eerror "DISTUTILS_USE_PEP517 does not match pyproject.toml!"
			eerror "    have: DISTUTILS_USE_PEP517=${DISTUTILS_USE_PEP517}"
			eerror "expected: DISTUTILS_USE_PEP517=${expected_value}"
			eerror "(backend: ${build_backend})"
			die "DISTUTILS_USE_PEP517 value incorrect"
		fi

		# fix deprecated backends up
		local new_backend=
		case ${build_backend} in
			flit.buildapi)
				new_backend=flit_core.buildapi
				;;
			poetry.masonry.api)
				new_backend=poetry.core.masonry.api
				;;
			setuptools.build_meta:__legacy__)
				# this backend should only be used as implicit fallback
				[[ ! ${legacy_fallback} ]] &&
					new_backend=setuptools.build_meta
				;;
		esac

		if [[ -n ${new_backend} ]]; then
			if [[ ! -f ${T}/.distutils_deprecated_backend_warned ]]; then
				eqawarn "${build_backend} backend is deprecated.  Please see:"
				eqawarn "https://projects.gentoo.org/python/guide/distutils.html#deprecated-pep-517-backends"
				eqawarn "The eclass will be using ${new_backend} instead."
				> "${T}"/.distutils_deprecated_backend_warned || die
			fi
			build_backend=${new_backend}
		fi
	fi

	echo "${build_backend}"
}

# @FUNCTION: distutils_wheel_install
# @USAGE: <root> <wheel>
# @DESCRIPTION:
# Install the specified wheel into <root>.
#
# This function is intended for expert use only.
distutils_wheel_install() {
	debug-print-function ${FUNCNAME} "${@}"
	if [[ ${#} -ne 2 ]]; then
		die "${FUNCNAME} takes exactly two arguments: <root> <wheel>"
	fi
	if [[ -z ${PYTHON} ]]; then
		die "PYTHON unset, invalid call context"
	fi

	local root=${1}
	local wheel=${2}

	einfo "  Installing ${wheel##*/} to ${root}"
	local cmd=(
		gpep517 install-wheel
			--destdir="${root}"
			--interpreter="${PYTHON}"
			--prefix="${EPREFIX}/usr"
			--optimize=all
			"${wheel}"
	)
	printf '%s\n' "${cmd[*]}"
	"${cmd[@]}" || die "Wheel install failed"

	# remove installed licenses
	find "${root}$(python_get_sitedir)" -depth \
		\( -path '*.dist-info/COPYING*' \
		-o -path '*.dist-info/LICENSE*' \
		-o -path '*.dist-info/license_files/*' \
		-o -path '*.dist-info/license_files' \
		\) -delete || die
}

# @FUNCTION: distutils_pep517_install
# @USAGE: <root>
# @DESCRIPTION:
# Build the wheel for the package in the current directory using PEP 517
# backend and install it into <root>.
#
# This function is intended for expert use only.  It does not handle
# wrapping executables.
distutils_pep517_install() {
	debug-print-function ${FUNCNAME} "${@}"
	[[ ${#} -eq 1 ]] || die "${FUNCNAME} takes exactly one argument: root"

	if [[ ! ${DISTUTILS_USE_PEP517:-no} != no ]]; then
		die "${FUNCNAME} is available only in PEP517 mode"
	fi

	local root=${1}
	local -x WHEEL_BUILD_DIR=${BUILD_DIR}/wheel
	mkdir -p "${WHEEL_BUILD_DIR}" || die

	if [[ -n ${mydistutilsargs[@]} ]]; then
		die "mydistutilsargs are banned in PEP517 mode (use DISTUTILS_ARGS)"
	fi

	local config_settings=
	case ${DISTUTILS_USE_PEP517} in
		meson-python)
			local -x NINJAOPTS=$(get_NINJAOPTS)
			config_settings=$(
				"${EPYTHON}" - "${DISTUTILS_ARGS[@]}" <<-EOF || die
					import json
					import os
					import shlex
					import sys

					ninjaopts = shlex.split(os.environ["NINJAOPTS"])
					print(json.dumps({
						"setup-args": sys.argv[1:],
						"compile-args": [
							"-v",
							f"--ninja-args={ninjaopts!r}",
						],
					}))
				EOF
			)
			;;
		setuptools)
			if [[ -n ${DISTUTILS_ARGS[@]} ]]; then
				config_settings=$(
					"${EPYTHON}" - "${DISTUTILS_ARGS[@]}" <<-EOF || die
						import json
						import sys
						print(json.dumps({"--global-option": sys.argv[1:]}))
					EOF
				)
			fi
			;;
		sip)
			if [[ -n ${DISTUTILS_ARGS[@]} ]]; then
				# NB: for practical reasons, we support only --foo=bar,
				# not --foo bar
				local arg
				for arg in "${DISTUTILS_ARGS[@]}"; do
					[[ ${arg} != -* ]] &&
						die "Bare arguments in DISTUTILS_ARGS unsupported: ${arg}"
				done

				config_settings=$(
					"${EPYTHON}" - "${DISTUTILS_ARGS[@]}" <<-EOF || die
						import collections
						import json
						import sys

						args = collections.defaultdict(list)
						for arg in (x.split("=", 1) for x in sys.argv[1:]): \
							args[arg[0]].extend(
								[arg[1]] if len(arg) > 1 else [])

						print(json.dumps(args))
					EOF
				)
			fi
			;;
		*)
			[[ -n ${DISTUTILS_ARGS[@]} ]] &&
				die "DISTUTILS_ARGS are not supported by ${DISTUTILS_USE_PEP517}"
			;;
	esac

	local build_backend=$(_distutils-r1_get_backend)
	einfo "  Building the wheel for ${PWD#${WORKDIR}/} via ${build_backend}"
	local cmd=(
		gpep517 build-wheel
			--backend "${build_backend}"
			--output-fd 3
			--wheel-dir "${WHEEL_BUILD_DIR}"
	)
	if [[ -n ${config_settings} ]]; then
		cmd+=( --config-json "${config_settings}" )
	fi
	# XXX(ovt): this logic is patched into setuptools/_distutils
	# keep it here for the reference for the future sync
	# if [[ -n ${SYSROOT} ]] && has_version -b ">=dev-python/gpep517-12"; then
	#	cmd+=( --sysroot "${SYSROOT}" )
	# fi
	printf '%s\n' "${cmd[*]}"
	local wheel=$(
		"${cmd[@]}" 3>&1 >&2 || die "Wheel build failed"
	)
	[[ -n ${wheel} ]] || die "No wheel name returned"

	distutils_wheel_install "${root}" "${WHEEL_BUILD_DIR}/${wheel}"

	# clean the build tree; otherwise we may end up with PyPy3
	# extensions duplicated into CPython dists
	if [[ ${DISTUTILS_USE_PEP517:-setuptools} == setuptools ]]; then
		rm -rf build || die
	fi
}

# @FUNCTION: distutils-r1_python_compile
# @USAGE: [additional-args...]
# @DESCRIPTION:
# The default python_compile(). Runs 'esetup.py build'. Any parameters
# passed to this function will be appended to setup.py invocation,
# i.e. passed as options to the 'build' command.
#
# This phase also sets up initial setup.cfg with build directories
# and copies upstream egg-info files if supplied.
distutils-r1_python_compile() {
	debug-print-function ${FUNCNAME} "${@}"

	case ${DISTUTILS_USE_PEP517:-setuptools} in
		setuptools)
			# call setup.py build when using setuptools (either via PEP517
			# or in legacy mode)

			if [[ ${DISTUTILS_USE_PEP517} ]]; then
				if [[ -d build ]]; then
					eqawarn "A 'build' directory exists already.  Artifacts from this directory may"
					eqawarn "be picked up by setuptools when building for another interpreter."
					eqawarn "Please remove this directory prior to building."
				fi
			else
				_distutils-r1_copy_egg_info
			fi

			# distutils is parallel-capable since py3.5
			local jobs=$(makeopts_jobs "${MAKEOPTS} ${*}")

			if [[ ${DISTUTILS_USE_PEP517} ]]; then
				# issue build_ext only if it looks like we have at least
				# two source files to build; setuptools is expensive
				# to start and parallel builds can only benefit us if we're
				# compiling at least two files
				#
				# see extension.py for list of suffixes
				# .pyx is added for Cython
				#
				# esetup.py does not respect SYSROOT, so skip it there
				if [[ -z ${SYSROOT} && 1 -ne ${jobs} && 2 -eq $(
					find '(' -name '*.c' -o -name '*.cc' -o -name '*.cpp' \
						-o -name '*.cxx' -o -name '*.c++' -o -name '*.m' \
						-o -name '*.mm' -o -name '*.pyx' ')' -printf '\n' |
						head -n 2 | wc -l
				) ]]; then
					esetup.py build_ext -j "${jobs}" "${@}"
				fi
			else
				esetup.py build -j "${jobs}" "${@}"
			fi
			;;
		maturin)
			# auditwheel may auto-bundle libraries (bug #831171),
			# also support cargo.eclass' IUSE=debug if available
			local -x MATURIN_PEP517_ARGS="
				--jobs=$(makeopts_jobs)
				--skip-auditwheel
				$(in_iuse debug && usex debug --profile=dev '')
			"
			;;
		no)
			return
			;;
	esac

	if [[ ${DISTUTILS_USE_PEP517} ]]; then
		distutils_pep517_install "${BUILD_DIR}/install"
	fi
}

# @FUNCTION: _distutils-r1_wrap_scripts
# @USAGE: <path> <bindir>
# @INTERNAL
# @DESCRIPTION:
# Moves and wraps all installed scripts/executables as necessary.
_distutils-r1_wrap_scripts() {
	debug-print-function ${FUNCNAME} "${@}"

	[[ ${#} -eq 2 ]] || die "usage: ${FUNCNAME} <path> <bindir>"
	local path=${1}
	local bindir=${2}

	local PYTHON_SCRIPTDIR
	python_export PYTHON_SCRIPTDIR

	local f python_files=() non_python_files=()

	if [[ -d ${path}${PYTHON_SCRIPTDIR} ]]; then
		for f in "${path}${PYTHON_SCRIPTDIR}"/*; do
			[[ -d ${f} ]] && die "Unexpected directory: ${f}"
			debug-print "${FUNCNAME}: found executable at ${f#${path}/}"

			local shebang
			read -r shebang < "${f}"
			if [[ ${shebang} == '#!'*${EPYTHON}* ]]; then
				debug-print "${FUNCNAME}: matching shebang: ${shebang}"
				python_files+=( "${f}" )
			else
				debug-print "${FUNCNAME}: non-matching shebang: ${shebang}"
				non_python_files+=( "${f}" )
			fi

			mkdir -p "${path}${bindir}" || die
		done

		for f in "${python_files[@]}"; do
			local basename=${f##*/}

			debug-print "${FUNCNAME}: installing wrapper at ${bindir}/${basename}"
			_python_ln_rel "${path}${EPREFIX}"/usr/lib/python-exec/python-exec2 \
				"${path}${bindir}/${basename}" || die
		done

		for f in "${non_python_files[@]}"; do
			local basename=${f##*/}

			debug-print "${FUNCNAME}: moving ${f#${path}/} to ${bindir}/${basename}"
			mv "${f}" "${path}${bindir}/${basename}" || die
		done
	fi
}

# @FUNCTION: distutils-r1_python_install
# @USAGE: [additional-args...]
# @DESCRIPTION:
# The default python_install().
#
# In PEP517 mode, merges the files from ${BUILD_DIR}/install
# (if present) to the image directory.
#
# In the legacy mode, calls `esetup.py install` to install the package.
# Any parameters passed to this function will be appended
# to the setup.py invocation (i.e. as options to the 'install' command).
distutils-r1_python_install() {
	debug-print-function ${FUNCNAME} "${@}"

	local scriptdir=${EPREFIX}/usr/bin
	local merge_root=
	if [[ ${DISTUTILS_USE_PEP517} ]]; then
		local root=${BUILD_DIR}/install
		local reg_scriptdir=${root}/${scriptdir}
		local wrapped_scriptdir=${root}$(python_get_scriptdir)

		# we are assuming that _distutils-r1_post_python_compile
		# has been called and ${root} has not been altered since
		# let's explicitly verify these assumptions

		# remove files that we've created explicitly
		rm "${reg_scriptdir}"/{"${EPYTHON}",python3,python,pyvenv.cfg} || die

		# Automagically do the QA check to avoid issues when bootstrapping
		# prefix.
		if type diff &>/dev/null ; then
			# verify that scriptdir & wrapped_scriptdir both contain
			# the same files
			(
				cd "${reg_scriptdir}" && find . -mindepth 1
			) | sort > "${T}"/.distutils-files-bin
			assert "listing ${reg_scriptdir} failed"
			(
				if [[ -d ${wrapped_scriptdir} ]]; then
					cd "${wrapped_scriptdir}" && find . -mindepth 1
				fi
			) | sort > "${T}"/.distutils-files-wrapped
			assert "listing ${wrapped_scriptdir} failed"
			if ! diff -U 0 "${T}"/.distutils-files-{bin,wrapped}; then
				die "File lists for ${reg_scriptdir} and ${wrapped_scriptdir} differ (see diff above)"
			fi
		fi

		# remove the altered bindir, executables from the package
		# are already in scriptdir
		rm -r "${reg_scriptdir}" || die
		if [[ ${DISTUTILS_SINGLE_IMPL} ]]; then
			if [[ -d ${wrapped_scriptdir} ]]; then
				mv "${wrapped_scriptdir}" "${reg_scriptdir}" || die
			fi
		fi
		# prune empty directories to see if ${root} contains anything
		# to merge
		find "${BUILD_DIR}"/install -type d -empty -delete || die
		[[ -d ${BUILD_DIR}/install ]] && merge_root=1
	else
		local root=${D%/}/_${EPYTHON}
		[[ ${DISTUTILS_SINGLE_IMPL} ]] && root=${D%/}

		local args=( "${@}" )

		# enable compilation for the install phase.
		local -x PYTHONDONTWRITEBYTECODE=

		# python likes to compile any module it sees, which triggers sandbox
		# failures if some packages haven't compiled their modules yet.
		addpredict "${EPREFIX}/usr/lib/${EPYTHON}"
		addpredict "${EPREFIX}/usr/$(get_libdir)/${EPYTHON}"
		addpredict /usr/lib/pypy2.7
		addpredict /usr/lib/pypy3.6
		addpredict /usr/lib/portage/pym
		addpredict /usr/local # bug 498232

		if [[ ! ${DISTUTILS_SINGLE_IMPL} ]]; then
			merge_root=1

			# user may override --install-scripts
			# note: this is poor but distutils argv parsing is dumb
			local mydistutilsargs=( "${mydistutilsargs[@]}" )
			local scriptdir=${EPREFIX}/usr/bin

			# construct a list of mydistutilsargs[0] args[0] args[1]...
			local arg arg_vars
			[[ ${mydistutilsargs[@]} ]] && eval arg_vars+=(
				'mydistutilsargs['{0..$(( ${#mydistutilsargs[@]} - 1 ))}']'
			)
			[[ ${args[@]} ]] && eval arg_vars+=(
				'args['{0..$(( ${#args[@]} - 1 ))}']'
			)

			set -- "${arg_vars[@]}"
			while [[ ${@} ]]; do
				local arg_var=${1}
				shift
				local a=${!arg_var}

				case "${a}" in
					--install-scripts=*)
						scriptdir=${a#--install-scripts=}
						unset "${arg_var}"
						;;
					--install-scripts)
						scriptdir=${!1}
						unset "${arg_var}" "${1}"
						shift
						;;
				esac
			done
		fi

		esetup.py install --root="${root}" "${args[@]}"
	fi

	local forbidden_package_names=( examples test tests .pytest_cache )
	local p
	for p in "${forbidden_package_names[@]}"; do
		if [[ -d ${root}$(python_get_sitedir)/${p} ]]; then
			die "Package installs '${p}' package which is forbidden and likely a bug in the build system."
		fi
	done

	local shopt_save=$(shopt -p nullglob)
	shopt -s nullglob
	local pypy_dirs=(
		"${root}/usr/$(get_libdir)"/pypy*/share
		"${root}/usr/lib"/pypy*/share
	)
	${shopt_save}

	if [[ -n ${pypy_dirs} ]]; then
		local cmd=die
		[[ ${EAPI} == [45] ]] && cmd=eqawarn
		"${cmd}" "Package installs 'share' in PyPy prefix, see bug #465546."
	fi

	if [[ ! ${DISTUTILS_SINGLE_IMPL} ]]; then
		_distutils-r1_wrap_scripts "${root}" "${scriptdir}"
	fi

	if [[ ${merge_root} ]]; then
		multibuild_merge_root "${root}" "${D%/}"
	fi
}

# @FUNCTION: distutils-r1_python_install_all
# @DESCRIPTION:
# The default python_install_all(). It installs the documentation.
distutils-r1_python_install_all() {
	debug-print-function ${FUNCNAME} "${@}"

	einstalldocs

	if declare -p EXAMPLES &>/dev/null; then
		[[ ${EAPI} != [45] ]] && die "EXAMPLES are banned in EAPI ${EAPI}"

		(
			docinto examples
			dodoc -r "${EXAMPLES[@]}"
		)
		docompress -x "/usr/share/doc/${PF}/examples"
	fi

	_DISTUTILS_DEFAULT_CALLED=1
}

# @FUNCTION: distutils-r1_run_phase
# @USAGE: [<argv>...]
# @INTERNAL
# @DESCRIPTION:
# Run the given command.
#
# If out-of-source builds are used, the phase function is run in source
# directory, with BUILD_DIR pointing at the build directory
# and PYTHONPATH having an entry for the module build directory.
#
# If in-source builds are used, the command is executed in the directory
# holding the per-implementation copy of sources. BUILD_DIR points
# to the 'build' subdirectory.
distutils-r1_run_phase() {
	debug-print-function ${FUNCNAME} "${@}"

	if [[ ${DISTUTILS_IN_SOURCE_BUILD} ]]; then
		[[ ${DISTUTILS_USE_PEP517} ]] &&
			die "DISTUTILS_IN_SOURCE_BUILD is not supported in PEP517 mode"
		# only force BUILD_DIR if implementation is explicitly enabled
		# for building; any-r1 API may select one that is not
		# https://bugs.gentoo.org/701506
		if [[ ! ${DISTUTILS_SINGLE_IMPL} ]] &&
				has "${EPYTHON/./_}" ${PYTHON_TARGETS}; then
			cd "${BUILD_DIR}" || die
		fi
		local BUILD_DIR=${BUILD_DIR}/build
	fi

	if [[ ${DISTUTILS_USE_PEP517} ]]; then
		local -x PATH=${BUILD_DIR}/install${EPREFIX}/usr/bin:${PATH}
	else
		local -x PYTHONPATH="${BUILD_DIR}/lib:${PYTHONPATH}"
		# Bug 559644
		# using PYTHONPATH when the ${BUILD_DIR}/lib is not created yet might lead to
		# problems in setup.py scripts that try to import modules/packages from that path
		# during the build process (Python at startup evaluates PYTHONPATH, if the dir is
		# not valid then associates a NullImporter object to ${BUILD_DIR}/lib storing it
		# in the sys.path_importer_cache)
		mkdir -p "${BUILD_DIR}/lib" || die
	fi

	# Set up build environment, bug #513664.
	local -x AR=${AR} CC=${CC} CPP=${CPP} CXX=${CXX}
	tc-export AR CC CPP CXX

	# How to build Python modules in different worlds...
	local ldopts
	case "${CHOST}" in
		# provided by haubi, 2014-07-08
		*-aix*) ldopts='-shared -Wl,-berok';; # good enough
		# provided by grobian, 2014-06-22, bug #513664 c7
		*-darwin*) ldopts='-bundle -undefined dynamic_lookup';;
		*) ldopts='-shared';;
	esac

	local -x LDSHARED="${CC} ${ldopts}" LDCXXSHARED="${CXX} ${ldopts}"
	local _DISTUTILS_POST_PHASE_RM=()

	"${@}"

	if [[ -n ${_DISTUTILS_POST_PHASE_RM} ]]; then
		rm "${_DISTUTILS_POST_PHASE_RM[@]}" || die
	fi

	cd "${_DISTUTILS_INITIAL_CWD}" || die
	if [[ ! ${_DISTUTILS_IN_COMMON_IMPL} ]] &&
		declare -f "_distutils-r1_post_python_${EBUILD_PHASE}" >/dev/null
	then
		"_distutils-r1_post_python_${EBUILD_PHASE}"
	fi
}

# @FUNCTION: _distutils-r1_run_common_phase
# @USAGE: [<argv>...]
# @INTERNAL
# @DESCRIPTION:
# Run the given command, restoring the state for a most preferred Python
# implementation matching DISTUTILS_ALL_SUBPHASE_IMPLS.
#
# If in-source build is used, the command will be run in the copy
# of sources made for the selected Python interpreter.
_distutils-r1_run_common_phase() {
	local DISTUTILS_ORIG_BUILD_DIR=${BUILD_DIR}
	local _DISTUTILS_IN_COMMON_IMPL=1

	if [[ ${DISTUTILS_SINGLE_IMPL} ]]; then
		# reuse the dedicated code branch
		_distutils-r1_run_foreach_impl "${@}"
	else
		local -x EPYTHON PYTHON
		local -x PATH=${PATH} PKG_CONFIG_PATH=${PKG_CONFIG_PATH}
		python_setup "${DISTUTILS_ALL_SUBPHASE_IMPLS[@]}"

		local MULTIBUILD_VARIANTS=( "${EPYTHON/./_}" )
		# store for restoring after distutils-r1_run_phase.
		local _DISTUTILS_INITIAL_CWD=${PWD}
		multibuild_foreach_variant \
			distutils-r1_run_phase "${@}"
	fi
}

# @FUNCTION: _distutils-r1_run_foreach_impl
# @INTERNAL
# @DESCRIPTION:
# Run the given phase for each implementation if multiple implementations
# are enabled, once otherwise.
_distutils-r1_run_foreach_impl() {
	debug-print-function ${FUNCNAME} "${@}"

	# store for restoring after distutils-r1_run_phase.
	local _DISTUTILS_INITIAL_CWD=${PWD}
	set -- distutils-r1_run_phase "${@}"

	if [[ ! ${DISTUTILS_SINGLE_IMPL} ]]; then
		python_foreach_impl "${@}"
	else
		if [[ ! ${EPYTHON} ]]; then
			die "EPYTHON unset, python-single-r1_pkg_setup not called?!"
		fi
		local BUILD_DIR=${BUILD_DIR:-${S}}
		BUILD_DIR=${BUILD_DIR%%/}_${EPYTHON}

		"${@}"
	fi
}

distutils-r1_src_prepare() {
	debug-print-function ${FUNCNAME} "${@}"

	local _DISTUTILS_DEFAULT_CALLED

	# common preparations
	if declare -f python_prepare_all >/dev/null; then
		python_prepare_all
	else
		distutils-r1_python_prepare_all
	fi

	if [[ ! ${_DISTUTILS_DEFAULT_CALLED} ]]; then
		local cmd=die
		[[ ${EAPI} == [45] ]] && cmd=eqawarn

		"${cmd}" "QA: python_prepare_all() didn't call distutils-r1_python_prepare_all"
	fi

	if declare -f python_prepare >/dev/null; then
		_distutils-r1_run_foreach_impl python_prepare
	fi
}

distutils-r1_src_configure() {
	python_export_utf8_locale
	[[ ${EAPI} == [56] ]] && xdg_environment_reset # Bug 577704

	if declare -f python_configure >/dev/null; then
		_distutils-r1_run_foreach_impl python_configure
	fi

	if declare -f python_configure_all >/dev/null; then
		_distutils-r1_run_common_phase python_configure_all
	fi
}

# @FUNCTION: _distutils-r1_post_python_compile
# @INTERNAL
# @DESCRIPTION:
# Post-phase function called after python_compile.  In PEP517 mode,
# it adjusts the install tree for venv-style usage.
_distutils-r1_post_python_compile() {
	debug-print-function ${FUNCNAME} "${@}"

	local root=${BUILD_DIR}/install
	if [[ ${DISTUTILS_USE_PEP517} && -d ${root} ]]; then
		# copy executables to python-exec directory
		# we do it early so that we can alter bindir recklessly
		local bindir=${root}${EPREFIX}/usr/bin
		local rscriptdir=${root}$(python_get_scriptdir)
		[[ -d ${rscriptdir} ]] &&
			die "${rscriptdir} should not exist!"
		if [[ -d ${bindir} ]]; then
			mkdir -p "${rscriptdir}" || die
			cp -a --reflink=auto "${bindir}"/. "${rscriptdir}"/ || die
		fi

		# enable venv magic inside the install tree
		mkdir -p "${bindir}" || die
		ln -s "${PYTHON}" "${bindir}/${EPYTHON}" || die
		ln -s "${EPYTHON}" "${bindir}/python3" || die
		ln -s "${EPYTHON}" "${bindir}/python" || die
		cat > "${bindir}"/pyvenv.cfg <<-EOF || die
			include-system-site-packages = true
		EOF

		# we need to change shebangs to point to the venv-python
		find "${bindir}" -type f -exec sed -i \
			-e "1s@^#!\(${EPREFIX}/usr/bin/\(python\|pypy\)\)@#!${root}\1@" \
			{} + || die
	fi
}

distutils-r1_src_compile() {
	debug-print-function ${FUNCNAME} "${@}"

	if declare -f python_compile >/dev/null; then
		_distutils-r1_run_foreach_impl python_compile
	else
		_distutils-r1_run_foreach_impl distutils-r1_python_compile
	fi

	if declare -f python_compile_all >/dev/null; then
		_distutils-r1_run_common_phase python_compile_all
	fi
}

# @FUNCTION: _distutils-r1_clean_egg_info
# @INTERNAL
# @DESCRIPTION:
# Clean up potential stray egg-info files left by setuptools test phase.
# Those files ended up being unversioned, and caused issues:
# https://bugs.gentoo.org/534058
_distutils-r1_clean_egg_info() {
	if [[ ${DISTUTILS_USE_PEP517} ]]; then
		die "${FUNCNAME} is not implemented in PEP517 mode"
	fi

	rm -rf "${BUILD_DIR}"/lib/*.egg-info || die
}

# @FUNCTION: _distutils-r1_post_python_test
# @INTERNAL
# @DESCRIPTION:
# Post-phase function called after python_test.
_distutils-r1_post_python_test() {
	debug-print-function ${FUNCNAME} "${@}"

	if [[ ! ${DISTUTILS_USE_PEP517} ]]; then
		_distutils-r1_clean_egg_info
	fi
}

distutils-r1_src_test() {
	debug-print-function ${FUNCNAME} "${@}"

	if declare -f python_test >/dev/null; then
		_distutils-r1_run_foreach_impl python_test
		_distutils-r1_run_foreach_impl _distutils-r1_clean_egg_info
	fi

	if declare -f python_test_all >/dev/null; then
		_distutils-r1_run_common_phase python_test_all
	fi
}

# @FUNCTION: _distutils-r1_post_python_install
# @INTERNAL
# @DESCRIPTION:
# Post-phase function called after python_install.  Performs QA checks.
# In PEP517 mode, additionally optimizes installed Python modules.
_distutils-r1_post_python_install() {
	debug-print-function ${FUNCNAME} "${@}"

	local sitedir=${D%/}$(python_get_sitedir)
	if [[ -d ${sitedir} ]]; then
		local forbidden_package_names=(
			examples test tests
			.pytest_cache .hypothesis _trial_temp
		)
		local p
		for p in "${forbidden_package_names[@]}"; do
			if [[ -d ${sitedir}/${p} ]]; then
				die "Package installs '${p}' package which is forbidden and likely a bug in the build system."
			fi
		done
	fi
}

# @FUNCTION: _distutils-r1_check_namespace_pth
# @INTERNAL
# @DESCRIPTION:
# Check if any *-nspkg.pth files were installed (by setuptools)
# and warn about the policy non-conformance if they were.
_distutils-r1_check_namespace_pth() {
	local f pth=()

	while IFS= read -r -d '' f; do
		pth+=( "${f}" )
	done < <(find "${ED%/}" -name '*-nspkg.pth' -print0)

	if [[ ${pth[@]} ]]; then
		ewarn "The following *-nspkg.pth files were found installed:"
		ewarn
		for f in "${pth[@]}"; do
			ewarn "  ${f#${ED%/}}"
		done
		ewarn
		ewarn "The presence of those files may break namespaces in Python 3.5+. Please"
		ewarn "read our documentation on reliable handling of namespaces and update"
		ewarn "the ebuild accordingly:"
		ewarn
		ewarn "  https://wiki.gentoo.org/wiki/Project:Python/Namespace_packages"
	fi
}

distutils-r1_src_install() {
	debug-print-function ${FUNCNAME} "${@}"

	if declare -f python_install >/dev/null; then
		_distutils-r1_run_foreach_impl python_install
	else
		_distutils-r1_run_foreach_impl distutils-r1_python_install
	fi

	local _DISTUTILS_DEFAULT_CALLED

	if declare -f python_install_all >/dev/null; then
		_distutils-r1_run_common_phase python_install_all
	else
		_distutils-r1_run_common_phase distutils-r1_python_install_all
	fi

	if [[ ! ${_DISTUTILS_DEFAULT_CALLED} ]]; then
		local cmd=die
		[[ ${EAPI} == [45] ]] && cmd=eqawarn

		"${cmd}" "QA: python_install_all() didn't call distutils-r1_python_install_all"
	fi

	_distutils-r1_check_namespace_pth
}

# -- distutils.eclass functions --

distutils_get_intermediate_installation_image() {
	die "${FUNCNAME}() is invalid for distutils-r1"
}

distutils_src_unpack() {
	die "${FUNCNAME}() is invalid for distutils-r1, and you don't want it in EAPI ${EAPI} anyway"
}

distutils_src_prepare() {
	die "${FUNCNAME}() is invalid for distutils-r1, you probably want: ${FUNCNAME/_/-r1_}"
}

distutils_src_compile() {
	die "${FUNCNAME}() is invalid for distutils-r1, you probably want: ${FUNCNAME/_/-r1_}"
}

distutils_src_test() {
	die "${FUNCNAME}() is invalid for distutils-r1, you probably want: ${FUNCNAME/_/-r1_}"
}

distutils_src_install() {
	die "${FUNCNAME}() is invalid for distutils-r1, you probably want: ${FUNCNAME/_/-r1_}"
}

distutils_pkg_postinst() {
	die "${FUNCNAME}() is invalid for distutils-r1, and pkg_postinst is unnecessary"
}

distutils_pkg_postrm() {
	die "${FUNCNAME}() is invalid for distutils-r1, and pkg_postrm is unnecessary"
}

_DISTUTILS_R1=1
fi