# Copyright 1999-2010 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/eclass/python.eclass,v 1.89 2010/02/14 18:53:11 arfrever Exp $

# @ECLASS: python.eclass
# @MAINTAINER:
# Gentoo Python Project <python@gentoo.org>
# @BLURB: Eclass for Python packages
# @DESCRIPTION:
# The python eclass contains miscellaneous, useful functions for Python packages.

inherit multilib

if ! has "${EAPI:-0}" 0 1 2 3; then
	die "API of python.eclass in EAPI=\"${EAPI}\" not established"
fi

_CPYTHON2_SUPPORTED_ABIS=(2.4 2.5 2.6 2.7)
_CPYTHON3_SUPPORTED_ABIS=(3.0 3.1 3.2)
_JYTHON_SUPPORTED_ABIS=(2.5-jython)

# @ECLASS-VARIABLE: PYTHON_DEPEND
# @DESCRIPTION:
# Specification of dependency on dev-lang/python.
# Syntax:
#   PYTHON_DEPEND:             [[!]USE_flag? ]<version_components_group>[ version_components_group]
#   version_components_group:  <major_version[:[minimal_version][:maximal_version]]>
#   major_version:             <2|3|*>
#   minimal_version:           <minimal_major_version.minimal_minor_version>
#   maximal_version:           <maximal_major_version.maximal_minor_version>

_parse_PYTHON_DEPEND() {
	local major_version maximal_version minimal_version python_all="0" python_maximal_version python_minimal_version python_versions=() python2="0" python2_maximal_version python2_minimal_version python3="0" python3_maximal_version python3_minimal_version USE_flag= version_components_group version_components_group_regex version_components_groups

	version_components_group_regex="(2|3|\*)(:([[:digit:]]+\.[[:digit:]]+)?(:([[:digit:]]+\.[[:digit:]]+)?)?)?"
	version_components_groups="${PYTHON_DEPEND}"

	if [[ "${version_components_groups}" =~ ^((\!)?[[:alnum:]_-]+\?\ )?${version_components_group_regex}(\ ${version_components_group_regex})?$ ]]; then
		if [[ "${version_components_groups}" =~ ^(\!)?[[:alnum:]_-]+\? ]]; then
			USE_flag="${version_components_groups%\? *}"
			version_components_groups="${version_components_groups#* }"
		fi
		if [[ "${version_components_groups}" =~ ("*".*" "|" *"|^2.*\ (2|\*)|^3.*\ (3|\*)) ]]; then
			die "Invalid syntax of PYTHON_DEPEND: Incorrectly specified groups of versions"
		fi

		version_components_groups="${version_components_groups// /$'\n'}"
		while read version_components_group; do
			major_version="${version_components_group:0:1}"
			minimal_version="${version_components_group:2}"
			minimal_version="${minimal_version%:*}"
			maximal_version="${version_components_group:$((3 + ${#minimal_version}))}"

			if [[ "${major_version}" =~ ^(2|3)$ ]]; then
				if [[ -n "${minimal_version}" && "${major_version}" != "${minimal_version:0:1}" ]]; then
					die "Invalid syntax of PYTHON_DEPEND: Minimal version '${minimal_version}' not in specified group of versions"
				fi
				if [[ -n "${maximal_version}" && "${major_version}" != "${maximal_version:0:1}" ]]; then
					die "Invalid syntax of PYTHON_DEPEND: Maximal version '${maximal_version}' not in specified group of versions"
				fi
			fi

			if [[ "${major_version}" == "2" ]]; then
				python2="1"
				python_versions=("${_CPYTHON2_SUPPORTED_ABIS[@]}")
				python2_minimal_version="${minimal_version}"
				python2_maximal_version="${maximal_version}"
			elif [[ "${major_version}" == "3" ]]; then
				python3="1"
				python_versions=("${_CPYTHON3_SUPPORTED_ABIS[@]}")
				python3_minimal_version="${minimal_version}"
				python3_maximal_version="${maximal_version}"
			else
				python_all="1"
				python_versions=("${_CPYTHON2_SUPPORTED_ABIS[@]}" "${_CPYTHON3_SUPPORTED_ABIS[@]}")
				python_minimal_version="${minimal_version}"
				python_maximal_version="${maximal_version}"
			fi

			if [[ -n "${minimal_version}" ]] && ! has "${minimal_version}" "${python_versions[@]}"; then
				die "Invalid syntax of PYTHON_DEPEND: Unrecognized minimal version '${minimal_version}'"
			fi
			if [[ -n "${maximal_version}" ]] && ! has "${maximal_version}" "${python_versions[@]}"; then
				die "Invalid syntax of PYTHON_DEPEND: Unrecognized maximal version '${maximal_version}'"
			fi

			if [[ -n "${minimal_version}" && -n "${maximal_version}" && "${minimal_version}" > "${maximal_version}" ]]; then
				die "Invalid syntax of PYTHON_DEPEND: Minimal version '${minimal_version}' greater than maximal version '${maximal_version}'"
			fi
		done <<< "${version_components_groups}"

		_PYTHON_ATOMS=()

		_append_accepted_versions_range() {
			local accepted_version="0" i
			for ((i = "${#python_versions[@]}"; i >= 0; i--)); do
				if [[ "${python_versions[${i}]}" == "${python_maximal_version}" ]]; then
					accepted_version="1"
				fi
				if [[ "${accepted_version}" == "1" ]]; then
					_PYTHON_ATOMS+=("=dev-lang/python-${python_versions[${i}]}*")
				fi
				if [[ "${python_versions[${i}]}" == "${python_minimal_version}" ]]; then
					accepted_version="0"
				fi
			done
		}

		if [[ "${python_all}" == "1" ]]; then
			if [[ -z "${python_minimal_version}" && -z "${python_maximal_version}" ]]; then
				_PYTHON_ATOMS+=("dev-lang/python")
			else
				python_versions=("${_CPYTHON2_SUPPORTED_ABIS[@]}" "${_CPYTHON3_SUPPORTED_ABIS[@]}")
				python_minimal_version="${python_minimal_version:-${python_versions[0]}}"
				python_maximal_version="${python_maximal_version:-${python_versions[${#python_versions[@]}-1]}}"
				_append_accepted_versions_range
			fi
		else
			if [[ "${python3}" == "1" ]]; then
				if [[ -z "${python3_minimal_version}" && -z "${python3_maximal_version}" ]]; then
					_PYTHON_ATOMS+=("=dev-lang/python-3*")
				else
					python_versions=("${_CPYTHON3_SUPPORTED_ABIS[@]}")
					python_minimal_version="${python3_minimal_version:-${python_versions[0]}}"
					python_maximal_version="${python3_maximal_version:-${python_versions[${#python_versions[@]}-1]}}"
					_append_accepted_versions_range
				fi
			fi
			if [[ "${python2}" == "1" ]]; then
				if [[ -z "${python2_minimal_version}" && -z "${python2_maximal_version}" ]]; then
					_PYTHON_ATOMS+=("=dev-lang/python-2*")
				else
					python_versions=("${_CPYTHON2_SUPPORTED_ABIS[@]}")
					python_minimal_version="${python2_minimal_version:-${python_versions[0]}}"
					python_maximal_version="${python2_maximal_version:-${python_versions[${#python_versions[@]}-1]}}"
					_append_accepted_versions_range
				fi
			fi
		fi

		unset -f _append_accepted_versions_range

		if [[ "${#_PYTHON_ATOMS[@]}" -gt 1 ]]; then
			DEPEND+="${DEPEND:+ }${USE_flag}${USE_flag:+? ( }|| ( ${_PYTHON_ATOMS[@]} )${USE_flag:+ )}"
			RDEPEND+="${RDEPEND:+ }${USE_flag}${USE_flag:+? ( }|| ( ${_PYTHON_ATOMS[@]} )${USE_flag:+ )}"
		else
			DEPEND+="${DEPEND:+ }${USE_flag}${USE_flag:+? ( }${_PYTHON_ATOMS[@]}${USE_flag:+ )}"
			RDEPEND+="${RDEPEND:+ }${USE_flag}${USE_flag:+? ( }${_PYTHON_ATOMS[@]}${USE_flag:+ )}"
		fi
	else
		die "Invalid syntax of PYTHON_DEPEND"
	fi
}

DEPEND=">=app-admin/eselect-python-20091230"
RDEPEND="${DEPEND}"

if [[ -n "${PYTHON_DEPEND}" && -n "${NEED_PYTHON}" ]]; then
	die "PYTHON_DEPEND and NEED_PYTHON cannot be set simultaneously"
elif [[ -n "${PYTHON_DEPEND}" ]]; then
	_parse_PYTHON_DEPEND
elif [[ -n "${NEED_PYTHON}" ]]; then
	if ! has "${EAPI:-0}" 0 1 2; then
		eerror "Use PYTHON_DEPEND instead of NEED_PYTHON."
		die "NEED_PYTHON cannot be used in this EAPI"
	fi
	_PYTHON_ATOMS=(">=dev-lang/python-${NEED_PYTHON}")
	DEPEND+="${DEPEND:+ }${_PYTHON_ATOMS[@]}"
	RDEPEND+="${RDEPEND:+ }${_PYTHON_ATOMS[@]}"
else
	_PYTHON_ATOMS=("dev-lang/python")
fi

# @ECLASS-VARIABLE: PYTHON_USE_WITH
# @DESCRIPTION:
# Set this to a space separated list of USE flags the Python slot in use must be built with.

# @ECLASS-VARIABLE: PYTHON_USE_WITH_OR
# @DESCRIPTION:
# Set this to a space separated list of USE flags of which one must be turned on for the slot in use.

# @ECLASS-VARIABLE: PYTHON_USE_WITH_OPT
# @DESCRIPTION:
# Set this to a name of a USE flag if you need to make either PYTHON_USE_WITH or
# PYTHON_USE_WITH_OR atoms conditional under a USE flag.

# @FUNCTION: python_pkg_setup
# @DESCRIPTION:
# Makes sure PYTHON_USE_WITH or PYTHON_USE_WITH_OR listed use flags
# are respected. Only exported if one of those variables is set.
if ! has "${EAPI:-0}" 0 1 && [[ -n ${PYTHON_USE_WITH} || -n ${PYTHON_USE_WITH_OR} ]]; then
	python_pkg_setup() {
		python_pkg_setup_fail() {
			eerror "${1}"
			die "${1}"
		}

		[[ ${PYTHON_USE_WITH_OPT} ]] && use !${PYTHON_USE_WITH_OPT} && return

		python_pkg_setup_check_USE_flags() {
			local pyatom use
			pyatom="$(python_get_implementational_package)"

			for use in ${PYTHON_USE_WITH}; do
				if ! has_version "${pyatom}[${use}]"; then
					python_pkg_setup_fail "Please rebuild ${pyatom} with the following USE flags enabled: ${PYTHON_USE_WITH}"
				fi
			done

			for use in ${PYTHON_USE_WITH_OR}; do
				if has_version "${pyatom}[${use}]"; then
					return
				fi
			done

			if [[ ${PYTHON_USE_WITH_OR} ]]; then
				python_pkg_setup_fail "Please rebuild ${pyatom} with at least one of the following USE flags enabled: ${PYTHON_USE_WITH_OR}"
			fi
		}

		if [[ -n "${SUPPORT_PYTHON_ABIS}" ]]; then
			python_execute_function -q python_pkg_setup_check_USE_flags
		else
			python_pkg_setup_check_USE_flags
		fi

		unset -f python_pkg_setup_check_USE_flags python_pkg_setup_fail
	}

	EXPORT_FUNCTIONS pkg_setup

	_PYTHON_USE_WITH_ATOM=""
	if [[ -n "${PYTHON_USE_WITH}" ]]; then
		for _PYTHON_ATOM in "${_PYTHON_ATOMS[@]}"; do
			_PYTHON_USE_WITH_ATOM+="${_PYTHON_USE_WITH_ATOM:+ }${_PYTHON_ATOM}[${PYTHON_USE_WITH/ /,}]"
		done
		_PYTHON_USE_WITH_ATOM="|| ( ${_PYTHON_USE_WITH_ATOM} )"
	elif [[ -n "${PYTHON_USE_WITH_OR}" ]]; then
		for _USE_flag in ${PYTHON_USE_WITH_OR}; do
			for _PYTHON_ATOM in "${_PYTHON_ATOMS[@]}"; do
				_PYTHON_USE_WITH_ATOM+="${_PYTHON_USE_WITH_ATOM:+ }${_PYTHON_ATOM}[${_USE_flag}]"
			done
		done
		unset _USE_flag
		_PYTHON_USE_WITH_ATOM="|| ( ${_PYTHON_USE_WITH_ATOM} )"
	fi
	if [[ -n "${PYTHON_USE_WITH_OPT}" ]]; then
		_PYTHON_USE_WITH_ATOM="${PYTHON_USE_WITH_OPT}? ( ${_PYTHON_USE_WITH_ATOM} )"
	fi
	DEPEND+=" ${_PYTHON_USE_WITH_ATOM}"
	RDEPEND+=" ${_PYTHON_USE_WITH_ATOM}"
	unset _PYTHON_ATOM _PYTHON_USE_WITH_ATOM
fi

unset _PYTHON_ATOMS

# ================================================================================================
# ======== FUNCTIONS FOR PACKAGES SUPPORTING INSTALLATION FOR MULTIPLE VERSIONS OF PYTHON ========
# ================================================================================================

# @ECLASS-VARIABLE: SUPPORT_PYTHON_ABIS
# @DESCRIPTION:
# Set this in EAPI <= 4 to indicate that current package supports installation for
# multiple versions of Python.

# @ECLASS-VARIABLE: PYTHON_DEFINE_DEFAULT_FUNCTIONS
# @DESCRIPTION:
# Set this to define default functions for the following ebuild phases:
# src_prepare, src_configure, src_compile, src_test, src_install.
if ! has "${EAPI:-0}" 0 1 && [[ -n "${PYTHON_DEFINE_DEFAULT_FUNCTIONS}" ]]; then
	python_src_prepare() {
		python_copy_sources
	}

	for python_default_function in src_configure src_compile src_test src_install; do
		eval "python_${python_default_function}() { python_execute_function -d -s; }"
	done
	unset python_default_function

	EXPORT_FUNCTIONS src_prepare src_configure src_compile src_test src_install
fi

unset PYTHON_ABIS
unset PYTHON_ABIS_SANITY_CHECKS

# @FUNCTION: validate_PYTHON_ABIS
# @DESCRIPTION:
# Ensure that PYTHON_ABIS variable has valid value.
# This function usually should not be directly called in ebuilds.
validate_PYTHON_ABIS() {
	# Ensure that some functions cannot be accidentally successfully used in EAPI <= 4 without setting SUPPORT_PYTHON_ABIS variable.
	if has "${EAPI:-0}" 0 1 2 3 4 && [[ -z "${SUPPORT_PYTHON_ABIS}" ]]; then
		die "${FUNCNAME}() cannot be used in this EAPI without setting SUPPORT_PYTHON_ABIS variable"
	fi

	# Ensure that /usr/bin/python and /usr/bin/python-config are valid.
	if [[ "$(readlink "${EPREFIX}/usr/bin/python")" != "python-wrapper" ]]; then
		eerror "'${EPREFIX}/usr/bin/python' is not valid symlink."
		eerror "Use \`eselect python set \${python_interpreter}\` to fix this problem."
		die "'${EPREFIX}/usr/bin/python' is not valid symlink"
	fi
	if [[ "$(<"${EPREFIX}/usr/bin/python-config")" != *"Gentoo python-config wrapper script"* ]]; then
		eerror "'${EPREFIX}/usr/bin/python-config' is not valid script"
		eerror "Use \`eselect python set \${python_interpreter}\` to fix this problem."
		die "'${EPREFIX}/usr/bin/python-config' is not valid script"
	fi

	# USE_${ABI_TYPE^^} and RESTRICT_${ABI_TYPE^^}_ABIS variables hopefully will be included in EAPI >= 5.
	if [[ "$(declare -p PYTHON_ABIS 2> /dev/null)" != "declare -x PYTHON_ABIS="* ]] && has "${EAPI:-0}" 0 1 2 3 4; then
		local PYTHON_ABI restricted_ABI support_ABI supported_PYTHON_ABIS=
		PYTHON_ABI_SUPPORTED_VALUES="${_CPYTHON2_SUPPORTED_ABIS[@]} ${_CPYTHON3_SUPPORTED_ABIS[@]} ${_JYTHON_SUPPORTED_ABIS[@]}"

		if [[ "$(declare -p USE_PYTHON 2> /dev/null)" == "declare -x USE_PYTHON="* ]]; then
			local python2_enabled="0" python3_enabled="0"

			if [[ -z "${USE_PYTHON}" ]]; then
				die "USE_PYTHON variable is empty"
			fi

			for PYTHON_ABI in ${USE_PYTHON}; do
				if ! has "${PYTHON_ABI}" ${PYTHON_ABI_SUPPORTED_VALUES}; then
					die "USE_PYTHON variable contains invalid value '${PYTHON_ABI}'"
				fi

				if has "${PYTHON_ABI}" "${_CPYTHON2_SUPPORTED_ABIS[@]}"; then
					python2_enabled="1"
				fi
				if has "${PYTHON_ABI}" "${_CPYTHON3_SUPPORTED_ABIS[@]}"; then
					python3_enabled="1"
				fi

				support_ABI="1"
				for restricted_ABI in ${RESTRICT_PYTHON_ABIS}; do
					if [[ "${PYTHON_ABI}" == ${restricted_ABI} ]]; then
						support_ABI="0"
						break
					fi
				done
				[[ "${support_ABI}" == "1" ]] && export PYTHON_ABIS+="${PYTHON_ABIS:+ }${PYTHON_ABI}"
			done

			if [[ -z "${PYTHON_ABIS//[${IFS}]/}" ]]; then
				die "USE_PYTHON variable does not enable any version of Python supported by ${CATEGORY}/${PF}"
			fi

			if [[ "${python2_enabled}" == "0" ]]; then
				ewarn "USE_PYTHON variable does not enable any version of Python 2. This configuration is unsupported."
			fi
			if [[ "${python3_enabled}" == "0" ]]; then
				ewarn "USE_PYTHON variable does not enable any version of Python 3. This configuration is unsupported."
			fi
			if [[ "${python2_enabled}" == "0" && "${python3_enabled}" == "0" ]]; then
				die "USE_PYTHON variable does not enable any version of CPython"
			fi
		else
			local python_version python2_version= python3_version= support_python_major_version

			python_version="$("${EPREFIX}/usr/bin/python" -c 'from sys import version_info; print(".".join(str(x) for x in version_info[:2]))')"

			if has_version "=dev-lang/python-2*"; then
				if [[ "$(readlink "${EPREFIX}/usr/bin/python2")" != "python2."* ]]; then
					die "'${EPREFIX}/usr/bin/python2' is not valid symlink"
				fi

				python2_version="$("${EPREFIX}/usr/bin/python2" -c 'from sys import version_info; print(".".join(str(x) for x in version_info[:2]))')"

				for PYTHON_ABI in "${_CPYTHON2_SUPPORTED_ABIS[@]}"; do
					support_python_major_version="1"
					for restricted_ABI in ${RESTRICT_PYTHON_ABIS}; do
						if [[ "${PYTHON_ABI}" == ${restricted_ABI} ]]; then
							support_python_major_version="0"
						fi
					done
					[[ "${support_python_major_version}" == "1" ]] && break
				done
				if [[ "${support_python_major_version}" == "1" ]]; then
					for restricted_ABI in ${RESTRICT_PYTHON_ABIS}; do
						if [[ "${python2_version}" == ${restricted_ABI} ]]; then
							die "Active version of Python 2 is not supported by ${CATEGORY}/${PF}"
						fi
					done
				else
					python2_version=""
				fi
			fi

			if has_version "=dev-lang/python-3*"; then
				if [[ "$(readlink "${EPREFIX}/usr/bin/python3")" != "python3."* ]]; then
					die "'${EPREFIX}/usr/bin/python3' is not valid symlink"
				fi

				python3_version="$("${EPREFIX}/usr/bin/python3" -c 'from sys import version_info; print(".".join(str(x) for x in version_info[:2]))')"

				for PYTHON_ABI in "${_CPYTHON3_SUPPORTED_ABIS[@]}"; do
					support_python_major_version="1"
					for restricted_ABI in ${RESTRICT_PYTHON_ABIS}; do
						if [[ "${PYTHON_ABI}" == ${restricted_ABI} ]]; then
							support_python_major_version="0"
						fi
					done
					[[ "${support_python_major_version}" == "1" ]] && break
				done
				if [[ "${support_python_major_version}" == "1" ]]; then
					for restricted_ABI in ${RESTRICT_PYTHON_ABIS}; do
						if [[ "${python3_version}" == ${restricted_ABI} ]]; then
							die "Active version of Python 3 is not supported by ${CATEGORY}/${PF}"
						fi
					done
				else
					python3_version=""
				fi
			fi

			if [[ -n "${python2_version}" && "${python_version}" == "2."* && "${python_version}" != "${python2_version}" ]]; then
				eerror "Python wrapper is configured incorrectly or '${EPREFIX}/usr/bin/python2' symlink"
				eerror "is set incorrectly. Use \`eselect python\` to fix configuration."
				die "Incorrect configuration of Python"
			fi
			if [[ -n "${python3_version}" && "${python_version}" == "3."* && "${python_version}" != "${python3_version}" ]]; then
				eerror "Python wrapper is configured incorrectly or '${EPREFIX}/usr/bin/python3' symlink"
				eerror "is set incorrectly. Use \`eselect python\` to fix configuration."
				die "Incorrect configuration of Python"
			fi

			PYTHON_ABIS="${python2_version} ${python3_version}"
			PYTHON_ABIS="${PYTHON_ABIS# }"
			export PYTHON_ABIS="${PYTHON_ABIS% }"
		fi
	fi

	if ! _python_implementation && [[ "$(declare -p PYTHON_ABIS_SANITY_CHECKS 2> /dev/null)" != "declare -- PYTHON_ABIS_SANITY_CHECKS="* ]]; then
		local PYTHON_ABI
		for PYTHON_ABI in ${PYTHON_ABIS}; do
			# Ensure that appropriate version of Python is installed.
			if ! has_version "$(python_get_implementational_package)"; then
				die "$(python_get_implementational_package) is not installed"
			fi

			# Ensure that EPYTHON variable is respected.
			if [[ "$(EPYTHON="$(PYTHON)" python -c "${_PYTHON_ABI_EXTRACTION_COMMAND}")" != "${PYTHON_ABI}" ]]; then
				eerror "python:                    '$(type -p python)'"
				eerror "ABI:                       '${ABI}'"
				eerror "DEFAULT_ABI:               '${DEFAULT_ABI}'"
				eerror "EPYTHON:                   '$(PYTHON)'"
				eerror "PYTHON_ABI:                '${PYTHON_ABI}'"
				eerror "Version of enabled Python: '$(EPYTHON="$(PYTHON)" python -c "${_PYTHON_ABI_EXTRACTION_COMMAND}")'"
				die "'python' does not respect EPYTHON variable"
			fi
		done
		PYTHON_ABIS_SANITY_CHECKS="1"
	fi
}

# @FUNCTION: python_execute_function
# @USAGE: [--action-message message] [-d|--default-function] [--failure-message message] [--nonfatal] [-q|--quiet] [-s|--separate-build-dirs] [--source-dir source_directory] [--] <function> [arguments]
# @DESCRIPTION:
# Execute specified function for each value of PYTHON_ABIS, optionally passing additional
# arguments. The specified function can use PYTHON_ABI and BUILDDIR variables.
python_execute_function() {
	local action action_message action_message_template= default_function="0" failure_message failure_message_template= function i nonfatal="0" previous_directory previous_directory_stack previous_directory_stack_length PYTHON_ABI quiet="0" separate_build_dirs="0" source_dir=

	while (($#)); do
		case "$1" in
			--action-message)
				action_message_template="$2"
				shift
				;;
			-d|--default-function)
				default_function="1"
				;;
			--failure-message)
				failure_message_template="$2"
				shift
				;;
			--nonfatal)
				nonfatal="1"
				;;
			-q|--quiet)
				quiet="1"
				;;
			-s|--separate-build-dirs)
				separate_build_dirs="1"
				;;
			--source-dir)
				source_dir="$2"
				shift
				;;
			--)
				shift
				break
				;;
			-*)
				die "${FUNCNAME}(): Unrecognized option '$1'"
				;;
			*)
				break
				;;
		esac
		shift
	done

	if [[ -n "${source_dir}" && "${separate_build_dirs}" == 0 ]]; then
		die "${FUNCNAME}(): '--source-dir' option can be specified only with '--separate-build-dirs' option"
	fi

	if [[ "${default_function}" == "0" ]]; then
		if [[ "$#" -eq 0 ]]; then
			die "${FUNCNAME}(): Missing function name"
		fi
		function="$1"
		shift

		if [[ -z "$(type -t "${function}")" ]]; then
			die "${FUNCNAME}(): '${function}' function is not defined"
		fi
	else
		if [[ "$#" -ne 0 ]]; then
			die "${FUNCNAME}(): '--default-function' option and function name cannot be specified simultaneously"
		fi
		if has "${EAPI:-0}" 0 1; then
			die "${FUNCNAME}(): '--default-function' option cannot be used in this EAPI"
		fi

		if [[ "${EBUILD_PHASE}" == "configure" ]]; then
			if has "${EAPI}" 2 3; then
				python_default_function() {
					econf
				}
			else
				python_default_function() {
					nonfatal econf
				}
			fi
		elif [[ "${EBUILD_PHASE}" == "compile" ]]; then
			python_default_function() {
				emake
			}
		elif [[ "${EBUILD_PHASE}" == "test" ]]; then
			python_default_function() {
				if emake -j1 -n check &> /dev/null; then
					emake -j1 check
				elif emake -j1 -n test &> /dev/null; then
					emake -j1 test
				fi
			}
		elif [[ "${EBUILD_PHASE}" == "install" ]]; then
			python_default_function() {
				emake DESTDIR="${D}" install
			}
		else
			die "${FUNCNAME}(): '--default-function' option cannot be used in this ebuild phase"
		fi
		function="python_default_function"
	fi

	for ((i = 1; i < "${#FUNCNAME[@]}"; i++)); do
		if [[ "${FUNCNAME[${i}]}" == "${FUNCNAME}" ]]; then
			die "${FUNCNAME}(): Invalid call stack"
		fi
	done

	if [[ "${quiet}" == "0" ]]; then
		[[ "${EBUILD_PHASE}" == "setup" ]] && action="Setting up"
		[[ "${EBUILD_PHASE}" == "unpack" ]] && action="Unpacking"
		[[ "${EBUILD_PHASE}" == "prepare" ]] && action="Preparation"
		[[ "${EBUILD_PHASE}" == "configure" ]] && action="Configuration"
		[[ "${EBUILD_PHASE}" == "compile" ]] && action="Building"
		[[ "${EBUILD_PHASE}" == "test" ]] && action="Testing"
		[[ "${EBUILD_PHASE}" == "install" ]] && action="Installation"
		[[ "${EBUILD_PHASE}" == "preinst" ]] && action="Preinstallation"
		[[ "${EBUILD_PHASE}" == "postinst" ]] && action="Postinstallation"
		[[ "${EBUILD_PHASE}" == "prerm" ]] && action="Preuninstallation"
		[[ "${EBUILD_PHASE}" == "postrm" ]] && action="Postuninstallation"
	fi

	local RED GREEN BLUE NORMAL
	if [[ "${NOCOLOR:-false}" =~ ^(false|no)$ ]]; then
		RED=$'\e[1;31m'
		GREEN=$'\e[1;32m'
		BLUE=$'\e[1;34m'
		NORMAL=$'\e[0m'
	else
		RED=
		GREEN=
		BLUE=
		NORMAL=
	fi

	validate_PYTHON_ABIS
	for PYTHON_ABI in ${PYTHON_ABIS}; do
		if [[ "${quiet}" == "0" ]]; then
			if [[ -n "${action_message_template}" ]]; then
				action_message="$(eval echo -n "${action_message_template}")"
			else
				action_message="${action} of ${CATEGORY}/${PF} with $(python_get_implementation) $(python_get_version)..."
			fi
			echo " ${GREEN}*${NORMAL} ${BLUE}${action_message}${NORMAL}"
		fi

		if [[ "${separate_build_dirs}" == "1" ]]; then
			if [[ -n "${source_dir}" ]]; then
				export BUILDDIR="${S}/${source_dir}-${PYTHON_ABI}"
			else
				export BUILDDIR="${S}-${PYTHON_ABI}"
			fi
			pushd "${BUILDDIR}" > /dev/null || die "pushd failed"
		else
			export BUILDDIR="${S}"
		fi

		previous_directory="$(pwd)"
		previous_directory_stack="$(dirs -p)"
		previous_directory_stack_length="$(dirs -p | wc -l)"

		if ! has "${EAPI}" 0 1 2 3 && has "${PYTHON_ABI}" ${FAILURE_TOLERANT_PYTHON_ABIS}; then
			EPYTHON="$(PYTHON)" nonfatal "${function}" "$@"
		else
			EPYTHON="$(PYTHON)" "${function}" "$@"
		fi

		if [[ "$?" != "0" ]]; then
			if [[ -n "${failure_message_template}" ]]; then
				failure_message="$(eval echo -n "${failure_message_template}")"
			else
				failure_message="${action} failed with $(python_get_implementation) $(python_get_version) in ${function}() function"
			fi

			if [[ "${nonfatal}" == "1" ]]; then
				if [[ "${quiet}" == "0" ]]; then
					ewarn "${RED}${failure_message}${NORMAL}"
				fi
			elif has "${PYTHON_ABI}" ${FAILURE_TOLERANT_PYTHON_ABIS}; then
				if [[ "${EBUILD_PHASE}" != "test" ]] || ! has test-fail-continue ${FEATURES}; then
					local enabled_PYTHON_ABIS= other_PYTHON_ABI
					for other_PYTHON_ABI in ${PYTHON_ABIS}; do
						[[ "${other_PYTHON_ABI}" != "${PYTHON_ABI}" ]] && enabled_PYTHON_ABIS+="${enabled_PYTHON_ABIS:+ }${other_PYTHON_ABI}"
					done
					export PYTHON_ABIS="${enabled_PYTHON_ABIS}"
				fi
				if [[ "${quiet}" == "0" ]]; then
					ewarn "${RED}${failure_message}${NORMAL}"
				fi
				if [[ -z "${PYTHON_ABIS}" ]]; then
					die "${function}() function failed with all enabled versions of Python"
				fi
			else
				die "${failure_message}"
			fi
		fi

		# Ensure that directory stack has not been decreased.
		if [[ "$(dirs -p | wc -l)" -lt "${previous_directory_stack_length}" ]]; then
			die "Directory stack decreased illegally"
		fi

		# Avoid side effects of earlier returning from the specified function.
		while [[ "$(dirs -p | wc -l)" -gt "${previous_directory_stack_length}" ]]; do
			popd > /dev/null || die "popd failed"
		done

		# Ensure that the bottom part of directory stack has not been changed. Restore
		# previous directory (from before running of the specified function) before
		# comparison of directory stacks to avoid mismatch of directory stacks after
		# potential using of 'cd' to change current directory. Restoration of previous
		# directory allows to safely use 'cd' to change current directory in the
		# specified function without changing it back to original directory.
		cd "${previous_directory}"
		if [[ "$(dirs -p)" != "${previous_directory_stack}" ]]; then
			die "Directory stack changed illegally"
		fi

		if [[ "${separate_build_dirs}" == "1" ]]; then
			popd > /dev/null || die "popd failed"
		fi
		unset BUILDDIR
	done

	if [[ "${default_function}" == "1" ]]; then
		unset -f python_default_function
	fi
}

# @FUNCTION: python_copy_sources
# @USAGE: [--no-link] [--] [directory]
# @DESCRIPTION:
# Copy unpacked sources of current package to separate build directory for each Python ABI.
python_copy_sources() {
	local dir dirs=() no_link="0" PYTHON_ABI

	while (($#)); do
		case "$1" in
			--no-link)
				no_link="1"
				;;
			--)
				shift
				break
				;;
			-*)
				die "${FUNCNAME}(): Unrecognized option '$1'"
				;;
			*)
				break
				;;
		esac
		shift
	done

	if [[ "$#" -eq 0 ]]; then
		if [[ "${WORKDIR}" == "${S}" ]]; then
			die "${FUNCNAME}() cannot be used"
		fi
		dirs="${S}"
	else
		dirs="$@"
	fi

	validate_PYTHON_ABIS
	for PYTHON_ABI in ${PYTHON_ABIS}; do
		for dir in "${dirs[@]}"; do
			if [[ "${no_link}" == "1" ]]; then
				cp -pr "${dir}" "${dir}-${PYTHON_ABI}" > /dev/null || die "Copying of sources failed"
			else
				cp -lpr "${dir}" "${dir}-${PYTHON_ABI}" > /dev/null || die "Copying of sources failed"
			fi
		done
	done
}

# @FUNCTION: python_set_build_dir_symlink
# @USAGE: [directory="build"]
# @DESCRIPTION:
# Create build directory symlink.
python_set_build_dir_symlink() {
	local dir="$1"

	[[ -z "${PYTHON_ABI}" ]] && die "PYTHON_ABI variable not set"
	[[ -z "${dir}" ]] && dir="build"

	# Do not delete preexistent directories.
	rm -f "${dir}" || die "Deletion of '${dir}' failed"
	ln -s "${dir}-${PYTHON_ABI}" "${dir}" || die "Creation of '${dir}' directory symlink failed"
}

# @FUNCTION: python_generate_wrapper_scripts
# @USAGE: [-E|--respect-EPYTHON] [-f|--force] [-q|--quiet] [--] <file> [files]
# @DESCRIPTION:
# Generate wrapper scripts. Existing files are overwritten only with --force option.
# If --respect-EPYTHON option is specified, then generated wrapper scripts will
# respect EPYTHON variable at run time.
python_generate_wrapper_scripts() {
	_python_initialize_prefix_variables

	local eselect_python_option file force="0" quiet="0" PYTHON_ABI python2_enabled="0" python3_enabled="0" respect_EPYTHON="0"

	while (($#)); do
		case "$1" in
			-E|--respect-EPYTHON)
				respect_EPYTHON="1"
				;;
			-f|--force)
				force="1"
				;;
			-q|--quiet)
				quiet="1"
				;;
			--)
				shift
				break
				;;
			-*)
				die "${FUNCNAME}(): Unrecognized option '$1'"
				;;
			*)
				break
				;;
		esac
		shift
	done

	if [[ "$#" -eq 0 ]]; then
		die "${FUNCNAME}(): Missing arguments"
	fi

	validate_PYTHON_ABIS
	for PYTHON_ABI in "${_CPYTHON2_SUPPORTED_ABIS[@]}"; do
		if has "${PYTHON_ABI}" ${PYTHON_ABIS}; then
			python2_enabled="1"
		fi
	done
	for PYTHON_ABI in "${_CPYTHON3_SUPPORTED_ABIS[@]}"; do
		if has "${PYTHON_ABI}" ${PYTHON_ABIS}; then
			python3_enabled="1"
		fi
	done

	if [[ "${python2_enabled}" == "1" && "${python3_enabled}" == "1" ]]; then
		eselect_python_option=
	elif [[ "${python2_enabled}" == "1" && "${python3_enabled}" == "0" ]]; then
		eselect_python_option="--python2"
	elif [[ "${python2_enabled}" == "0" && "${python3_enabled}" == "1" ]]; then
		eselect_python_option="--python3"
	else
		die "${FUNCNAME}(): Unsupported environment"
	fi

	for file in "$@"; do
		if [[ -f "${file}" && "${force}" == "0" ]]; then
			die "${FUNCNAME}(): '$1' already exists"
		fi

		if [[ "${quiet}" == "0" ]]; then
			einfo "Generating '${file#${D%/}}' wrapper script"
		fi

		cat << EOF > "${file}"
#!/usr/bin/env python
# Gentoo '${file##*/}' wrapper script

import os
import re
import subprocess
import sys

EPYTHON_re = re.compile(r"^python(\d+\.\d+)$")

EOF
		if [[ "$?" != "0" ]]; then
			die "${FUNCNAME}(): Generation of '$1' failed"
		fi
		if [[ "${respect_EPYTHON}" == "1" ]]; then
			cat << EOF >> "${file}"
EPYTHON = os.environ.get("EPYTHON")
if EPYTHON:
	EPYTHON_matched = EPYTHON_re.match(EPYTHON)
	if EPYTHON_matched:
		PYTHON_ABI = EPYTHON_matched.group(1)
	else:
		sys.stderr.write("EPYTHON variable has unrecognized value '%s'\n" % EPYTHON)
		sys.exit(1)
else:
	try:
		eselect_process = subprocess.Popen(["${EPREFIX}/usr/bin/eselect", "python", "show"${eselect_python_option:+, $(echo "\"")}${eselect_python_option}${eselect_python_option:+$(echo "\"")}], stdout=subprocess.PIPE)
		if eselect_process.wait() != 0:
			raise ValueError
	except (OSError, ValueError):
		sys.stderr.write("Execution of 'eselect python show${eselect_python_option:+ }${eselect_python_option}' failed\n")
		sys.exit(1)

	eselect_output = eselect_process.stdout.read()
	if not isinstance(eselect_output, str):
		# Python 3
		eselect_output = eselect_output.decode()

	EPYTHON_matched = EPYTHON_re.match(eselect_output)
	if EPYTHON_matched:
		PYTHON_ABI = EPYTHON_matched.group(1)
	else:
		sys.stderr.write("'eselect python show${eselect_python_option:+ }${eselect_python_option}' printed unrecognized value '%s" % eselect_output)
		sys.exit(1)
EOF
			if [[ "$?" != "0" ]]; then
				die "${FUNCNAME}(): Generation of '$1' failed"
			fi
		else
			cat << EOF >> "${file}"
try:
	eselect_process = subprocess.Popen(["${EPREFIX}/usr/bin/eselect", "python", "show"${eselect_python_option:+, $(echo "\"")}${eselect_python_option}${eselect_python_option:+$(echo "\"")}], stdout=subprocess.PIPE)
	if eselect_process.wait() != 0:
		raise ValueError
except (OSError, ValueError):
	sys.stderr.write("Execution of 'eselect python show${eselect_python_option:+ }${eselect_python_option}' failed\n")
	sys.exit(1)

eselect_output = eselect_process.stdout.read()
if not isinstance(eselect_output, str):
	# Python 3
	eselect_output = eselect_output.decode()

EPYTHON_matched = EPYTHON_re.match(eselect_output)
if EPYTHON_matched:
	PYTHON_ABI = EPYTHON_matched.group(1)
else:
	sys.stderr.write("'eselect python show${eselect_python_option:+ }${eselect_python_option}' printed unrecognized value '%s" % eselect_output)
	sys.exit(1)
EOF
			if [[ "$?" != "0" ]]; then
				die "${FUNCNAME}(): Generation of '$1' failed"
			fi
		fi
		cat << EOF >> "${file}"

os.environ["PYTHON_SCRIPT_NAME"] = sys.argv[0]
target_executable = "%s-%s" % (os.path.realpath(sys.argv[0]), PYTHON_ABI)
if not os.path.exists(target_executable):
	sys.stderr.write("'%s' does not exist\n" % target_executable)
	sys.exit(1)

os.execv(target_executable, sys.argv)
EOF
		if [[ "$?" != "0" ]]; then
			die "${FUNCNAME}(): Generation of '$1' failed"
		fi
		fperms +x "${file#${ED%/}}" || die "fperms '${file}' failed"
	done
}

# ================================================================================================
# ====== FUNCTIONS FOR PACKAGES NOT SUPPORTING INSTALLATION FOR MULTIPLE VERSIONS OF PYTHON ======
# ================================================================================================

# @FUNCTION: python_set_active_version
# @USAGE: <CPython_ABI|2|3>
# @DESCRIPTION:
# Set specified version of CPython as active version of Python.
python_set_active_version() {
	if [[ -n "${SUPPORT_PYTHON_ABIS}" ]]; then
		die "${FUNCNAME}() cannot be used in ebuilds of packages supporting installation for multiple versions of Python"
	fi

	if [[ "$#" -ne 1 ]]; then
		die "${FUNCNAME}() requires 1 argument"
	fi

	if [[ "$1" =~ ^[[:digit:]]+\.[[:digit:]]+$ ]]; then
		if ! _python_implementation && ! has_version "dev-lang/python:$1"; then
			die "${FUNCNAME}(): 'dev-lang/python:$1' is not installed"
		fi
		export EPYTHON="$(PYTHON "$1")"
	elif [[ "$1" == "2" ]]; then
		if ! _python_implementation && ! has_version "=dev-lang/python-2*"; then
			die "${FUNCNAME}(): '=dev-lang/python-2*' is not installed"
		fi
		export EPYTHON="$(PYTHON -2)"
	elif [[ "$1" == "3" ]]; then
		if ! _python_implementation && ! has_version "=dev-lang/python-3*"; then
			die "${FUNCNAME}(): '=dev-lang/python-3*' is not installed"
		fi
		export EPYTHON="$(PYTHON -3)"
	else
		die "${FUNCNAME}(): Unrecognized argument '$1'"
	fi

	# PYTHON_ABI variable is intended to be used only in ebuilds/eclasses,
	# so it does not need to be exported to subprocesses.
	PYTHON_ABI="${EPYTHON#python}"
	PYTHON_ABI="${PYTHON_ABI%%-*}"

	# python-updater checks PYTHON_REQUESTED_ACTIVE_VERSION variable.
	PYTHON_REQUESTED_ACTIVE_VERSION="$1"
}

# @FUNCTION: python_need_rebuild
# @DESCRIPTION: Mark current package for rebuilding by python-updater after
# switching of active version of Python.
python_need_rebuild() {
	export PYTHON_NEED_REBUILD="$(PYTHON -A --ABI)"
}

# ================================================================================================
# ======================================= GETTER FUNCTIONS =======================================
# ================================================================================================

_PYTHON_ABI_EXTRACTION_COMMAND='import platform
import sys
sys.stdout.write(".".join(str(x) for x in sys.version_info[:2]))
if platform.system()[:4] == "Java":
	sys.stdout.write("-jython")'

_python_get_implementation() {
	if [[ "$#" -ne 1 ]]; then
		die "${FUNCNAME}() requires 1 argument"
	fi

	if [[ "$1" =~ ^[[:digit:]]+\.[[:digit:]]+$ ]]; then
		echo "CPython"
	elif [[ "$1" =~ ^[[:digit:]]+\.[[:digit:]]+-jython$ ]]; then
		echo "Jython"
	else
		die "${FUNCNAME}(): Unrecognized Python ABI '$1'"
	fi
}

# @FUNCTION: PYTHON
# @USAGE: [-2] [-3] [--ABI] [-A|--active] [-a|--absolute-path] [-f|--final-ABI] [--] <Python_ABI="${PYTHON_ABI}">
# @DESCRIPTION:
# Print filename of Python interpreter for specified Python ABI. If Python_ABI argument
# is ommitted, then PYTHON_ABI environment variable must be set and is used.
# If -2 option is specified, then active version of Python 2 is used.
# If -3 option is specified, then active version of Python 3 is used.
# If --active option is specified, then active version of Python is used.
# Active version of Python can be set by python_set_active_version().
# If --final-ABI option is specified, then final ABI from the list of enabled ABIs is used.
# -2, -3, --active and --final-ABI options and Python_ABI argument cannot be specified simultaneously.
# If --ABI option is specified, then only specified Python ABI is printed instead of
# filename of Python interpreter.
# If --absolute-path option is specified, then absolute path to Python interpreter is printed.
# --ABI and --absolute-path options cannot be specified simultaneously.
PYTHON() {
	local ABI_output="0" absolute_path_output="0" active="0" final_ABI="0" PYTHON_ABI="${PYTHON_ABI}" python_interpreter python2="0" python3="0"

	while (($#)); do
		case "$1" in
			-2)
				python2="1"
				;;
			-3)
				python3="1"
				;;
			--ABI)
				ABI_output="1"
				;;
			-A|--active)
				active="1"
				;;
			-a|--absolute-path)
				absolute_path_output="1"
				;;
			-f|--final-ABI)
				final_ABI="1"
				;;
			--)
				shift
				break
				;;
			-*)
				die "${FUNCNAME}(): Unrecognized option '$1'"
				;;
			*)
				break
				;;
		esac
		shift
	done

	if [[ "${ABI_output}" == "1" && "${absolute_path_output}" == "1" ]]; then
		die "${FUNCNAME}(): '--ABI and '--absolute-path' options cannot be specified simultaneously"
	fi

	if [[ "$((${python2} + ${python3} + ${active} + ${final_ABI}))" -gt 1 ]]; then
		die "${FUNCNAME}(): '-2', '-3', '--active' or '--final-ABI' options cannot be specified simultaneously"
	fi

	if [[ "$#" -eq 0 ]]; then
		if [[ "${active}" == "1" ]]; then
			if [[ -n "${SUPPORT_PYTHON_ABIS}" ]]; then
				die "${FUNCNAME}(): '--active' option cannot be used in ebuilds of packages supporting installation for multiple versions of Python"
			fi
			PYTHON_ABI="$("${EPREFIX}/usr/bin/python" -c "${_PYTHON_ABI_EXTRACTION_COMMAND}")"
		elif [[ "${final_ABI}" == "1" ]]; then
			if has "${EAPI:-0}" 0 1 2 3 4 && [[ -z "${SUPPORT_PYTHON_ABIS}" ]]; then
				die "${FUNCNAME}(): '--final-ABI' option cannot be used in ebuilds of packages not supporting installation for multiple versions of Python"
			fi
			validate_PYTHON_ABIS
			PYTHON_ABI="${PYTHON_ABIS##* }"
		elif [[ "${python2}" == "1" ]]; then
			PYTHON_ABI="$(eselect python show --python2 --ABI)"
			if [[ -z "${PYTHON_ABI}" ]]; then
				die "${FUNCNAME}(): Active Python 2 interpreter not set"
			elif [[ "${PYTHON_ABI}" != "2."* ]]; then
				die "${FUNCNAME}(): Internal error in \`eselect python show --python2\`"
			fi
		elif [[ "${python3}" == "1" ]]; then
			PYTHON_ABI="$(eselect python show --python3 --ABI)"
			if [[ -z "${PYTHON_ABI}" ]]; then
				die "${FUNCNAME}(): Active Python 3 interpreter not set"
			elif [[ "${PYTHON_ABI}" != "3."* ]]; then
				die "${FUNCNAME}(): Internal error in \`eselect python show --python3\`"
			fi
		elif [[ -z "${PYTHON_ABI}" ]]; then
			die "${FUNCNAME}(): Invalid usage: Python ABI not specified"
		fi
	elif [[ "$#" -eq 1 ]]; then
		if [[ "${active}" == "1" ]]; then
			die "${FUNCNAME}(): '--active' option and Python ABI cannot be specified simultaneously"
		fi
		if [[ "${final_ABI}" == "1" ]]; then
			die "${FUNCNAME}(): '--final-ABI' option and Python ABI cannot be specified simultaneously"
		fi
		if [[ "${python2}" == "1" ]]; then
			die "${FUNCNAME}(): '-2' option and Python ABI cannot be specified simultaneously"
		fi
		if [[ "${python3}" == "1" ]]; then
			die "${FUNCNAME}(): '-3' option and Python ABI cannot be specified simultaneously"
		fi
		PYTHON_ABI="$1"
	else
		die "${FUNCNAME}(): Invalid usage"
	fi

	if [[ "${ABI_output}" == "1" ]]; then
		echo -n "${PYTHON_ABI}"
		return
	else
		if [[ "$(_python_get_implementation "${PYTHON_ABI}")" == "CPython" ]]; then
			python_interpreter="python${PYTHON_ABI}"
		elif [[ "$(_python_get_implementation "${PYTHON_ABI}")" == "Jython" ]]; then
			python_interpreter="jython-${PYTHON_ABI%-jython}"
		fi

		if [[ "${absolute_path_output}" == "1" ]]; then
			echo -n "${EPREFIX}/usr/bin/${python_interpreter}"
		else
			echo -n "${python_interpreter}"
		fi
	fi

	if [[ -n "${ABI}" && "${ABI}" != "${DEFAULT_ABI}" && "${DEFAULT_ABI}" != "default" ]]; then
		echo -n "-${ABI}"
	fi
}

# @FUNCTION: python_get_implementation
# @USAGE: [-f|--final-ABI]
# @DESCRIPTION:
# Print name of Python implementation.
# If --final-ABI option is specified, then final ABI from the list of enabled ABIs is used.
python_get_implementation() {
	local final_ABI="0" PYTHON_ABI="${PYTHON_ABI}"

	while (($#)); do
		case "$1" in
			-f|--final-ABI)
				final_ABI="1"
				;;
			-*)
				die "${FUNCNAME}(): Unrecognized option '$1'"
				;;
			*)
				die "${FUNCNAME}(): Invalid usage"
				;;
		esac
		shift
	done

	if [[ "${final_ABI}" == "1" ]]; then
		PYTHON_ABI="$(PYTHON -f --ABI)"
	elif [[ -z "${PYTHON_ABI}" ]]; then
		PYTHON_ABI="$(PYTHON -A --ABI)"
	fi

	echo "$(_python_get_implementation "${PYTHON_ABI}")"
}

# @FUNCTION: python_get_implementational_package
# @USAGE: [-f|--final-ABI]
# @DESCRIPTION:
# Print category, name and slot of package providing Python implementation.
# If --final-ABI option is specified, then final ABI from the list of enabled ABIs is used.
python_get_implementational_package() {
	local final_ABI="0" PYTHON_ABI="${PYTHON_ABI}"

	while (($#)); do
		case "$1" in
			-f|--final-ABI)
				final_ABI="1"
				;;
			-*)
				die "${FUNCNAME}(): Unrecognized option '$1'"
				;;
			*)
				die "${FUNCNAME}(): Invalid usage"
				;;
		esac
		shift
	done

	if [[ "${final_ABI}" == "1" ]]; then
		PYTHON_ABI="$(PYTHON -f --ABI)"
	elif [[ -z "${PYTHON_ABI}" ]]; then
		PYTHON_ABI="$(PYTHON -A --ABI)"
	fi

	if [[ "$(_python_get_implementation "${PYTHON_ABI}")" == "CPython" ]]; then
		echo "dev-lang/python:${PYTHON_ABI}"
	elif [[ "$(_python_get_implementation "${PYTHON_ABI}")" == "Jython" ]]; then
		echo "dev-java/jython:${PYTHON_ABI%-jython}"
	fi
}

# @FUNCTION: python_get_includedir
# @USAGE: [-f|--final-ABI]
# @DESCRIPTION:
# Print path to Python include directory.
# If --final-ABI option is specified, then final ABI from the list of enabled ABIs is used.
python_get_includedir() {
	local final_ABI="0" PYTHON_ABI="${PYTHON_ABI}"

	while (($#)); do
		case "$1" in
			-f|--final-ABI)
				final_ABI="1"
				;;
			-*)
				die "${FUNCNAME}(): Unrecognized option '$1'"
				;;
			*)
				die "${FUNCNAME}(): Invalid usage"
				;;
		esac
		shift
	done

	if [[ "${final_ABI}" == "1" ]]; then
		PYTHON_ABI="$(PYTHON -f --ABI)"
	elif [[ -z "${PYTHON_ABI}" ]]; then
		PYTHON_ABI="$(PYTHON -A --ABI)"
	fi

	if [[ "$(_python_get_implementation "${PYTHON_ABI}")" == "CPython" ]]; then
		echo "/usr/include/python${PYTHON_ABI}"
	elif [[ "$(_python_get_implementation "${PYTHON_ABI}")" == "Jython" ]]; then
		echo "/usr/share/jython-${PYTHON_ABI%-jython}/Include"
	fi
}

# @FUNCTION: python_get_libdir
# @USAGE: [-f|--final-ABI]
# @DESCRIPTION:
# Print path to Python library directory.
# If --final-ABI option is specified, then final ABI from the list of enabled ABIs is used.
python_get_libdir() {
	local final_ABI="0" PYTHON_ABI="${PYTHON_ABI}"

	while (($#)); do
		case "$1" in
			-f|--final-ABI)
				final_ABI="1"
				;;
			-*)
				die "${FUNCNAME}(): Unrecognized option '$1'"
				;;
			*)
				die "${FUNCNAME}(): Invalid usage"
				;;
		esac
		shift
	done

	if [[ "${final_ABI}" == "1" ]]; then
		PYTHON_ABI="$(PYTHON -f --ABI)"
	elif [[ -z "${PYTHON_ABI}" ]]; then
		PYTHON_ABI="$(PYTHON -A --ABI)"
	fi

	if [[ "$(_python_get_implementation "${PYTHON_ABI}")" == "CPython" ]]; then
		echo "/usr/$(get_libdir)/python${PYTHON_ABI}"
	elif [[ "$(_python_get_implementation "${PYTHON_ABI}")" == "Jython" ]]; then
		echo "/usr/share/jython-${PYTHON_ABI%-jython}/Lib"
	fi
}

# @FUNCTION: python_get_sitedir
# @USAGE: [-f|--final-ABI]
# @DESCRIPTION:
# Print path to Python site-packages directory.
# If --final-ABI option is specified, then final ABI from the list of enabled ABIs is used.
python_get_sitedir() {
	local options=()

	while (($#)); do
		case "$1" in
			-f|--final-ABI)
				options+=("$1")
				;;
			-*)
				die "${FUNCNAME}(): Unrecognized option '$1'"
				;;
			*)
				die "${FUNCNAME}(): Invalid usage"
				;;
		esac
		shift
	done

	echo "$(python_get_libdir "${options[@]}")/site-packages"
}

# @FUNCTION: python_get_library
# @USAGE: [-f|--final-ABI] [-l|--linker-option]
# @DESCRIPTION:
# Print path to Python library.
# If --linker-option is specified, then "-l${library}" linker option is printed.
# If --final-ABI option is specified, then final ABI from the list of enabled ABIs is used.
python_get_library() {
	local final_ABI="0" linker_option="0" PYTHON_ABI="${PYTHON_ABI}"

	while (($#)); do
		case "$1" in
			-f|--final-ABI)
				final_ABI="1"
				;;
			-l|--linker-option)
				linker_option="1"
				;;
			-*)
				die "${FUNCNAME}(): Unrecognized option '$1'"
				;;
			*)
				die "${FUNCNAME}(): Invalid usage"
				;;
		esac
		shift
	done

	if [[ "${final_ABI}" == "1" ]]; then
		PYTHON_ABI="$(PYTHON -f --ABI)"
	elif [[ -z "${PYTHON_ABI}" ]]; then
		PYTHON_ABI="$(PYTHON -A --ABI)"
	fi

	if [[ "$(_python_get_implementation "${PYTHON_ABI}")" == "CPython" ]]; then
		if [[ "${linker_option}" == "1" ]]; then
			echo "-lpython${PYTHON_ABI}"
		else
			echo "/usr/$(get_libdir)/libpython${PYTHON_ABI}$(get_libname)"
		fi
	elif [[ "$(_python_get_implementation "${PYTHON_ABI}")" == "Jython" ]]; then
		die "${FUNCNAME}(): Jython does not have shared library"
	fi
}

# @FUNCTION: python_get_version
# @USAGE: [-f|--final-ABI] [--major] [--minor] [--micro]
# @DESCRIPTION:
# Print Python version.
# --major, --minor and --micro options cannot be specified simultaneously.
# If --major, --minor and --micro options are not specified, then "${major_version}.${minor_version}" is printed.
# If --final-ABI option is specified, then final ABI from the list of enabled ABIs is used.
python_get_version() {
	local final_ABI="0" major="0" minor="0" micro="0" python_command

	while (($#)); do
		case "$1" in
			-f|--final-ABI)
				final_ABI="1"
				;;
			--major)
				major="1"
				;;
			--minor)
				minor="1"
				;;
			--micro)
				micro="1"
				;;
			-*)
				die "${FUNCNAME}(): Unrecognized option '$1'"
				;;
			*)
				die "${FUNCNAME}(): Invalid usage"
				;;
		esac
		shift
	done

	if [[ "$((${major} + ${minor} + ${micro}))" -gt 1 ]]; then
		die "${FUNCNAME}(): '--major', '--minor' or '--micro' options cannot be specified simultaneously"
	fi

	if [[ "${major}" == "1" ]]; then
		python_command="from sys import version_info; print(version_info[0])"
	elif [[ "${minor}" == "1" ]]; then
		python_command="from sys import version_info; print(version_info[1])"
	elif [[ "${micro}" == "1" ]]; then
		python_command="from sys import version_info; print(version_info[2])"
	else
		python_command="from sys import version_info; print('.'.join(str(x) for x in version_info[:2]))"
	fi

	if [[ "${final_ABI}" == "1" ]]; then
		"$(PYTHON -f)" -c "${python_command}"
	else
		"$(PYTHON "${PYTHON_ABI--A}")" -c "${python_command}"
	fi
}

# ================================================================================================
# =================================== MISCELLANEOUS FUNCTIONS ====================================
# ================================================================================================

_python_implementation() {
	if [[ "${CATEGORY}/${PN}" == "dev-lang/python" ]]; then
		return 0
	elif [[ "${CATEGORY}/${PN}" == "dev-java/jython" ]]; then
		return 0
	else
		return 1
	fi
}

_python_initialize_prefix_variables() {
	if has "${EAPI:-0}" 0 1 2; then
		if [[ -n "${ROOT}" && -z "${EROOT}" ]]; then
			EROOT="${ROOT%/}${EPREFIX}/"
		fi
		if [[ -n "${D}" && -z "${ED}" ]]; then
			ED="${D%/}${EPREFIX}/"
		fi
	fi
}

# @FUNCTION: python_convert_shebangs
# @USAGE: [-q|--quiet] [-r|--recursive] [-x|--only-executables] [--] <Python_version> <file|directory> [files|directories]
# @DESCRIPTION:
# Convert shebangs in specified files. Directories can be specified only with --recursive option.
python_convert_shebangs() {
	local argument file files=() only_executables="0" python_version quiet="0" recursive="0"

	while (($#)); do
		case "$1" in
			-r|--recursive)
				recursive="1"
				;;
			-q|--quiet)
				quiet="1"
				;;
			-x|--only-executables)
				only_executables="1"
				;;
			--)
				shift
				break
				;;
			-*)
				die "${FUNCNAME}(): Unrecognized option '$1'"
				;;
			*)
				break
				;;
		esac
		shift
	done

	if [[ "$#" -eq 0 ]]; then
		die "${FUNCNAME}(): Missing Python version and files or directories"
	elif [[ "$#" -eq 1 ]]; then
		die "${FUNCNAME}(): Missing files or directories"
	fi

	python_version="$1"
	shift

	for argument in "$@"; do
		if [[ ! -e "${argument}" ]]; then
			die "${FUNCNAME}(): '${argument}' does not exist"
		elif [[ -f "${argument}" ]]; then
			files+=("${argument}")
		elif [[ -d "${argument}" ]]; then
			if [[ "${recursive}" == "1" ]]; then
				if [[ "${only_executables}" == "1" ]]; then
					files+=($(find "${argument}" -perm /111 -type f))
				else
					files+=($(find "${argument}" -type f))
				fi
			else
				die "${FUNCNAME}(): '${argument}' is not a regular file"
			fi
		else
			die "${FUNCNAME}(): '${argument}' is not a regular file or a directory"
		fi
	done

	for file in "${files[@]}"; do
		file="${file#./}"
		[[ "${only_executables}" == "1" && ! -x "${file}" ]] && continue

		if [[ "$(head -n1 "${file}")" =~ ^'#!'.*python ]]; then
			if [[ "${quiet}" == "0" ]]; then
				einfo "Converting shebang in '${file}'"
			fi
			sed -e "1s/python\([[:digit:]]\+\(\.[[:digit:]]\+\)\?\)\?/python${python_version}/" -i "${file}" || die "Conversion of shebang in '${file}' failed"

			# Delete potential whitespace after "#!".
			sed -e '1s/\(^#!\)[[:space:]]*/\1/' -i "${file}" || die "sed '${file}' failed"
		fi
	done
}

# @FUNCTION: python_mod_exists
# @USAGE: <module>
# @DESCRIPTION:
# Run with the module name as an argument. It will check if a
# Python module is installed and loadable. It will return
# TRUE(0) if the module exists, and FALSE(1) if the module does
# not exist.
#
# Example:
#         if python_mod_exists gtk; then
#             echo "gtk support enabled"
#         fi
python_mod_exists() {
	if [[ "$#" -ne 1 ]]; then
		die "${FUNCNAME}() requires 1 argument"
	fi
	"$(PYTHON "${PYTHON_ABI--A}")" -c "import $1" &> /dev/null
}

# @FUNCTION: python_tkinter_exists
# @DESCRIPTION:
# Run without arguments, checks if Python was compiled with Tkinter
# support.  If not, prints an error message and dies.
python_tkinter_exists() {
	if ! "$(PYTHON "${PYTHON_ABI--A}")" -c "from sys import version_info
if version_info[0] == 3:
	import tkinter
else:
	import Tkinter" &> /dev/null; then
		eerror "Python needs to be rebuilt with tkinter support enabled."
		eerror "Add the following line to '${EPREFIX}/etc/portage/package.use' and rebuild Python"
		eerror "dev-lang/python tk"
		die "Python installed without support for tkinter"
	fi
}

# ================================================================================================
# ================================ FUNCTIONS FOR RUNNING OF TESTS ================================
# ================================================================================================

# @ECLASS-VARIABLE: PYTHON_TEST_VERBOSITY
# @DESCRIPTION:
# User-configurable verbosity of tests of Python modules.
# Supported values: 0, 1, 2, 3, 4.
PYTHON_TEST_VERBOSITY="${PYTHON_TEST_VERBOSITY:-1}"

# @FUNCTION: python_execute_nosetests
# @USAGE: [-P|--PYTHONPATH PYTHONPATH] [-s|--separate-build-dirs] [--] [arguments]
# @DESCRIPTION:
# Execute nosetests for all enabled versions of Python.
python_execute_nosetests() {
	local PYTHONPATH_template= separate_build_dirs=

	while (($#)); do
		case "$1" in
			-P|--PYTHONPATH)
				PYTHONPATH_template="$2"
				shift
				;;
			-s|--separate-build-dirs)
				separate_build_dirs="1"
				;;
			--)
				shift
				break
				;;
			-*)
				die "${FUNCNAME}(): Unrecognized option '$1'"
				;;
			*)
				break
				;;
		esac
		shift
	done

	python_test_function() {
		local evaluated_PYTHONPATH=

		if [[ -n "${PYTHONPATH_template}" ]]; then
			evaluated_PYTHONPATH="$(eval echo -n "${PYTHONPATH_template}")"
			if [[ ! -e "${evaluated_PYTHONPATH}" ]]; then
				unset evaluated_PYTHONPATH
			fi
		fi

		if [[ -n "${evaluated_PYTHONPATH}" ]]; then
			echo PYTHONPATH="${evaluated_PYTHONPATH}" nosetests --verbosity="${PYTHON_TEST_VERBOSITY}" "$@"
			PYTHONPATH="${evaluated_PYTHONPATH}" nosetests --verbosity="${PYTHON_TEST_VERBOSITY}" "$@"
		else
			echo nosetests --verbosity="${PYTHON_TEST_VERBOSITY}" "$@"
			nosetests --verbosity="${PYTHON_TEST_VERBOSITY}" "$@"
		fi
	}
	if [[ -n "${SUPPORT_PYTHON_ABIS}" ]]; then
		python_execute_function ${separate_build_dirs:+-s} python_test_function "$@"
	else
		if [[ -n "${separate_build_dirs}" ]]; then
			die "${FUNCNAME}(): Invalid usage"
		fi
		python_test_function "$@" || die "Testing failed"
	fi

	unset -f python_test_function
}

# @FUNCTION: python_execute_py.test
# @USAGE: [-P|--PYTHONPATH PYTHONPATH] [-s|--separate-build-dirs] [--] [arguments]
# @DESCRIPTION:
# Execute py.test for all enabled versions of Python.
python_execute_py.test() {
	local PYTHONPATH_template= separate_build_dirs=

	while (($#)); do
		case "$1" in
			-P|--PYTHONPATH)
				PYTHONPATH_template="$2"
				shift
				;;
			-s|--separate-build-dirs)
				separate_build_dirs="1"
				;;
			--)
				shift
				break
				;;
			-*)
				die "${FUNCNAME}(): Unrecognized option '$1'"
				;;
			*)
				break
				;;
		esac
		shift
	done

	python_test_function() {
		local evaluated_PYTHONPATH=

		if [[ -n "${PYTHONPATH_template}" ]]; then
			evaluated_PYTHONPATH="$(eval echo -n "${PYTHONPATH_template}")"
			if [[ ! -e "${evaluated_PYTHONPATH}" ]]; then
				unset evaluated_PYTHONPATH
			fi
		fi

		if [[ -n "${evaluated_PYTHONPATH}" ]]; then
			echo PYTHONPATH="${evaluated_PYTHONPATH}" py.test $([[ "${PYTHON_TEST_VERBOSITY}" -ge 2 ]] && echo -v) "$@"
			PYTHONPATH="${evaluated_PYTHONPATH}" py.test $([[ "${PYTHON_TEST_VERBOSITY}" -ge 2 ]] && echo -v) "$@"
		else
			echo py.test $([[ "${PYTHON_TEST_VERBOSITY}" -gt 1 ]] && echo -v) "$@"
			py.test $([[ "${PYTHON_TEST_VERBOSITY}" -gt 1 ]] && echo -v) "$@"
		fi
	}
	if [[ -n "${SUPPORT_PYTHON_ABIS}" ]]; then
		python_execute_function ${separate_build_dirs:+-s} python_test_function "$@"
	else
		if [[ -n "${separate_build_dirs}" ]]; then
			die "${FUNCNAME}(): Invalid usage"
		fi
		python_test_function "$@" || die "Testing failed"
	fi

	unset -f python_test_function
}

# @FUNCTION: python_execute_trial
# @USAGE: [-P|--PYTHONPATH PYTHONPATH] [-s|--separate-build-dirs] [--] [arguments]
# @DESCRIPTION:
# Execute trial for all enabled versions of Python.
python_execute_trial() {
	local PYTHONPATH_template= separate_build_dirs=

	while (($#)); do
		case "$1" in
			-P|--PYTHONPATH)
				PYTHONPATH_template="$2"
				shift
				;;
			-s|--separate-build-dirs)
				separate_build_dirs="1"
				;;
			--)
				shift
				break
				;;
			-*)
				die "${FUNCNAME}(): Unrecognized option '$1'"
				;;
			*)
				break
				;;
		esac
		shift
	done

	python_test_function() {
		local evaluated_PYTHONPATH=

		if [[ -n "${PYTHONPATH_template}" ]]; then
			evaluated_PYTHONPATH="$(eval echo -n "${PYTHONPATH_template}")"
			if [[ ! -e "${evaluated_PYTHONPATH}" ]]; then
				unset evaluated_PYTHONPATH
			fi
		fi

		if [[ -n "${evaluated_PYTHONPATH}" ]]; then
			echo PYTHONPATH="${evaluated_PYTHONPATH}" trial $([[ "${PYTHON_TEST_VERBOSITY}" -ge 4 ]] && echo --spew) "$@"
			PYTHONPATH="${evaluated_PYTHONPATH}" trial $([[ "${PYTHON_TEST_VERBOSITY}" -ge 4 ]] && echo --spew) "$@"
		else
			echo trial $([[ "${PYTHON_TEST_VERBOSITY}" -ge 4 ]] && echo --spew) "$@"
			trial $([[ "${PYTHON_TEST_VERBOSITY}" -ge 4 ]] && echo --spew) "$@"
		fi
	}
	if [[ -n "${SUPPORT_PYTHON_ABIS}" ]]; then
		python_execute_function ${separate_build_dirs:+-s} python_test_function "$@"
	else
		if [[ -n "${separate_build_dirs}" ]]; then
			die "${FUNCNAME}(): Invalid usage"
		fi
		python_test_function "$@" || die "Testing failed"
	fi

	unset -f python_test_function
}

# ================================================================================================
# ======================= FUNCTIONS FOR HANDLING OF BYTE-COMPILED MODULES ========================
# ================================================================================================

# @FUNCTION: python_enable_pyc
# @DESCRIPTION:
# Tell Python to automatically recompile modules to .pyc/.pyo if the
# timestamps/version stamps have changed.
python_enable_pyc() {
	unset PYTHONDONTWRITEBYTECODE
}

# @FUNCTION: python_disable_pyc
# @DESCRIPTION:
# Tell Python not to automatically recompile modules to .pyc/.pyo
# even if the timestamps/version stamps do not match. This is done
# to protect sandbox.
python_disable_pyc() {
	export PYTHONDONTWRITEBYTECODE="1"
}

# @FUNCTION: python_mod_optimize
# @USAGE: [options] [directory|file]
# @DESCRIPTION:
# If no arguments supplied, it will recompile not recursively all modules
# under sys.path (eg. /usr/lib/python2.6, /usr/lib/python2.6/site-packages).
#
# If supplied with arguments, it will recompile all modules recursively
# in the supplied directory.
# This function should only be run in pkg_postinst().
#
# Options passed to this function are passed to compileall.py.
#
# Example:
#         python_mod_optimize ctypesgencore
python_mod_optimize() {
	_python_initialize_prefix_variables

	# Check if phase is pkg_postinst().
	[[ ${EBUILD_PHASE} != "postinst" ]] && die "${FUNCNAME}() should only be run in pkg_postinst()"

	if ! has "${EAPI:-0}" 0 1 2 || [[ -n "${SUPPORT_PYTHON_ABIS}" ]]; then
		local dir file options=() other_dirs=() other_files=() previous_PYTHON_ABI="${PYTHON_ABI}" PYTHON_ABI return_code root site_packages_absolute_dirs=() site_packages_dirs=() site_packages_absolute_files=() site_packages_files=()

		# Strip trailing slash from ROOT.
		root="${EROOT%/}"

		# Respect ROOT and options passed to compileall.py.
		while (($#)); do
			case "$1" in
				-l|-f|-q)
					options+=("$1")
					;;
				-d|-x)
					options+=("$1" "$2")
					shift
					;;
				-*)
					ewarn "${FUNCNAME}(): Ignoring option '$1'"
					;;
				*)
					if ! _python_implementation && [[ "$1" =~ ^"${EPREFIX}"/usr/lib(32|64)?/python[[:digit:]]+\.[[:digit:]]+ ]]; then
						die "${FUNCNAME}() does not support absolute paths of directories/files in site-packages directories"
					elif [[ "$1" =~ ^/ ]]; then
						if [[ -d "${root}/$1" ]]; then
							other_dirs+=("${root}/$1")
						elif [[ -f "${root}/$1" ]]; then
							other_files+=("${root}/$1")
						elif [[ -e "${root}/$1" ]]; then
							ewarn "'${root}/$1' is not a file or a directory!"
						else
							ewarn "'${root}/$1' does not exist!"
						fi
					else
						for PYTHON_ABI in ${PYTHON_ABIS-${PYTHON_ABI-$(PYTHON -A --ABI)}}; do
							if [[ -d "${root}$(python_get_sitedir)/$1" ]]; then
								site_packages_dirs+=("$1")
								break
							elif [[ -f "${root}$(python_get_sitedir)/$1" ]]; then
								site_packages_files+=("$1")
								break
							elif [[ -e "${root}$(python_get_sitedir)/$1" ]]; then
								ewarn "'$1' is not a file or a directory!"
							else
								ewarn "'$1' does not exist!"
							fi
						done
					fi
					;;
			esac
			shift
		done

		# Set additional options.
		options+=("-q")

		for PYTHON_ABI in ${PYTHON_ABIS-${PYTHON_ABI-$(PYTHON -A --ABI)}}; do
			if ((${#site_packages_dirs[@]})) || ((${#site_packages_files[@]})); then
				return_code="0"
				ebegin "Compilation and optimization of Python modules for $(python_get_implementation) $(python_get_version)"
				if ((${#site_packages_dirs[@]})); then
					for dir in "${site_packages_dirs[@]}"; do
						site_packages_absolute_dirs+=("${root}$(python_get_sitedir)/${dir}")
					done
					"$(PYTHON)" "${root}$(python_get_libdir)/compileall.py" "${options[@]}" "${site_packages_absolute_dirs[@]}" || return_code="1"
					if [[ "$(_python_get_implementation "${PYTHON_ABI}")" != "Jython" ]]; then
						"$(PYTHON)" -O "${root}$(python_get_libdir)/compileall.py" "${options[@]}" "${site_packages_absolute_dirs[@]}" &> /dev/null || return_code="1"
					fi
				fi
				if ((${#site_packages_files[@]})); then
					for file in "${site_packages_files[@]}"; do
						site_packages_absolute_files+=("${root}$(python_get_sitedir)/${file}")
					done
					"$(PYTHON)" "${root}$(python_get_libdir)/py_compile.py" "${site_packages_absolute_files[@]}" || return_code="1"
					if [[ "$(_python_get_implementation "${PYTHON_ABI}")" != "Jython" ]]; then
						"$(PYTHON)" -O "${root}$(python_get_libdir)/py_compile.py" "${site_packages_absolute_files[@]}" &> /dev/null || return_code="1"
					fi
				fi
				eend "${return_code}"
			fi
			unset site_packages_absolute_dirs site_packages_absolute_files
		done

		# Restore previous value of PYTHON_ABI.
		if [[ -n "${previous_PYTHON_ABI}" ]]; then
			PYTHON_ABI="${previous_PYTHON_ABI}"
		else
			unset PYTHON_ABI
		fi

		if ((${#other_dirs[@]})) || ((${#other_files[@]})); then
			return_code="0"
			ebegin "Compilation and optimization of Python modules placed outside of site-packages directories for $(python_get_implementation) $(python_get_version)"
			if ((${#other_dirs[@]})); then
				"$(PYTHON "${PYTHON_ABI--A}")" "${root}$(python_get_libdir)/compileall.py" "${options[@]}" "${other_dirs[@]}" || return_code="1"
				if [[ "$(_python_get_implementation "${PYTHON_ABI-$(PYTHON -A --ABI)}")" != "Jython" ]]; then
					"$(PYTHON "${PYTHON_ABI--A}")" -O "${root}$(python_get_libdir)/compileall.py" "${options[@]}" "${other_dirs[@]}" &> /dev/null || return_code="1"
				fi
			fi
			if ((${#other_files[@]})); then
				"$(PYTHON "${PYTHON_ABI--A}")" "${root}$(python_get_libdir)/py_compile.py" "${other_files[@]}" || return_code="1"
				if [[ "$(_python_get_implementation "${PYTHON_ABI-$(PYTHON -A --ABI)}")" != "Jython" ]]; then
					"$(PYTHON "${PYTHON_ABI--A}")" -O "${root}$(python_get_libdir)/py_compile.py" "${other_files[@]}" &> /dev/null || return_code="1"
				fi
			fi
			eend "${return_code}"
		fi
	else
		local myroot mydirs=() myfiles=() myopts=() return_code="0"

		# strip trailing slash
		myroot="${EROOT%/}"

		# respect ROOT and options passed to compileall.py
		while (($#)); do
			case "$1" in
				-l|-f|-q)
					myopts+=("$1")
					;;
				-d|-x)
					myopts+=("$1" "$2")
					shift
					;;
				-*)
					ewarn "${FUNCNAME}(): Ignoring option '$1'"
					;;
				*)
					if [[ -d "${myroot}"/$1 ]]; then
						mydirs+=("${myroot}/$1")
					elif [[ -f "${myroot}"/$1 ]]; then
						# Files are passed to python_mod_compile which is ROOT-aware
						myfiles+=("$1")
					elif [[ -e "${myroot}/$1" ]]; then
						ewarn "${myroot}/$1 is not a file or directory!"
					else
						ewarn "${myroot}/$1 does not exist!"
					fi
					;;
			esac
			shift
		done

		# set additional opts
		myopts+=(-q)

		ebegin "Compilation and optimization of Python modules for $(python_get_implementation) $(python_get_version)"
		if ((${#mydirs[@]})); then
			"$(PYTHON "${PYTHON_ABI--A}")" "${myroot}$(python_get_libdir)/compileall.py" "${myopts[@]}" "${mydirs[@]}" || return_code="1"
			"$(PYTHON "${PYTHON_ABI--A}")" -O "${myroot}$(python_get_libdir)/compileall.py" "${myopts[@]}" "${mydirs[@]}" &> /dev/null || return_code="1"
		fi

		if ((${#myfiles[@]})); then
			python_mod_compile "${myfiles[@]}"
		fi

		eend "${return_code}"
	fi
}

# @FUNCTION: python_mod_cleanup
# @USAGE: [directory|file]
# @DESCRIPTION:
# Run with optional arguments, where arguments are Python modules. If none given,
# it will look in /usr/lib/python[0-9].[0-9].
#
# It will recursively scan all compiled Python modules in the directories and
# determine if they are orphaned (i.e. their corresponding .py files are missing.)
# If they are, then it will remove their corresponding .pyc and .pyo files.
#
# This function should only be run in pkg_postrm().
python_mod_cleanup() {
	_python_initialize_prefix_variables

	local path py_file PYTHON_ABI SEARCH_PATH=() root

	# Check if phase is pkg_postrm().
	[[ ${EBUILD_PHASE} != "postrm" ]] && die "${FUNCNAME}() should only be run in pkg_postrm()"

	# Strip trailing slash from ROOT.
	root="${EROOT%/}"

	if (($#)); then
		if ! has "${EAPI:-0}" 0 1 2 || [[ -n "${SUPPORT_PYTHON_ABIS}" ]]; then
			while (($#)); do
				if ! _python_implementation && [[ "$1" =~ ^"${EPREFIX}"/usr/lib(32|64)?/python[[:digit:]]+\.[[:digit:]]+ ]]; then
					die "${FUNCNAME}() does not support absolute paths of directories/files in site-packages directories"
				elif [[ "$1" =~ ^/ ]]; then
					SEARCH_PATH+=("${root}/${1#/}")
				else
					for PYTHON_ABI in ${PYTHON_ABIS-${PYTHON_ABI-$(PYTHON -A --ABI)}}; do
						SEARCH_PATH+=("${root}$(python_get_sitedir)/$1")
					done
				fi
				shift
			done
		else
			SEARCH_PATH=("${@#/}")
			SEARCH_PATH=("${SEARCH_PATH[@]/#/${root}/}")
		fi
	else
		local dir sitedir
		for dir in "${root}"/usr/lib*; do
			if [[ -d "${dir}" && ! -L "${dir}" ]]; then
				for sitedir in "${dir}"/python*/site-packages; do
					if [[ -d "${sitedir}" ]]; then
						SEARCH_PATH+=("${sitedir}")
					fi
				done
			fi
		done
		for sitedir in "${root}"/usr/share/jython-*/Lib/site-packages; do
			if [[ -d "${sitedir}" ]]; then
				SEARCH_PATH+=("${sitedir}")
			fi
		done
	fi

	local BLUE CYAN NORMAL
	if [[ "${NOCOLOR:-false}" =~ ^(false|no)$ ]]; then
		BLUE=$'\e[1;34m'
		CYAN=$'\e[1;36m'
		NORMAL=$'\e[0m'
	else
		BLUE=
		CYAN=
		NORMAL=
	fi

	for path in "${SEARCH_PATH[@]}"; do
		if [[ -d "${path}" ]]; then
			find "${path}" "(" -name "*.py[co]" -o -name "*\$py.class" ")" -print0 | while read -rd ''; do
				if [[ "${REPLY}" == *[co] ]]; then
					py_file="${REPLY%[co]}"
					[[ -f "${py_file}" || (! -f "${py_file}c" && ! -f "${py_file}o") ]] && continue
					einfo "${BLUE}<<< ${py_file}[co]${NORMAL}"
					rm -f "${py_file}"[co]
				elif [[ "${REPLY}" == *\$py.class ]]; then
					py_file="${REPLY%\$py.class}.py"
					[[ -f "${py_file}" || ! -f "${py_file%.py}\$py.class" ]] && continue
					einfo "${BLUE}<<< ${py_file%.py}\$py.class${NORMAL}"
					rm -f "${py_file%.py}\$py.class"
				fi
			done

			# Attempt to delete directories, which may be empty.
			find "${path}" -type d | sort -r | while read -r dir; do
				rmdir "${dir}" 2>/dev/null && einfo "${CYAN}<<< ${dir}${NORMAL}"
			done
		elif [[ "${path}" == *.py && ! -f "${path}" ]]; then
			if [[ (-f "${path}c" || -f "${path}o") ]]; then
				einfo "${BLUE}<<< ${path}[co]${NORMAL}"
				rm -f "${path}"[co]
			fi
			if [[ -f "${path%.py}\$py.class" ]]; then
				einfo "${BLUE}<<< ${path%.py}\$py.class${NORMAL}"
				rm -f "${path%.py}\$py.class"
			fi
		fi
	done
}

# ================================================================================================
# ===================================== DEPRECATED FUNCTIONS =====================================
# ================================================================================================

# @FUNCTION: python_version
# @DESCRIPTION:
# Run without arguments and it will export the version of python
# currently in use as $PYVER; sets PYVER/PYVER_MAJOR/PYVER_MINOR
python_version() {
	if ! has "${EAPI:-0}" 0 1 2; then
		eerror "Use PYTHON() and/or python_get_*() instead of ${FUNCNAME}()."
		die "${FUNCNAME}() cannot be used in this EAPI"
	fi

	[[ -n "${PYVER}" ]] && return 0
	local tmpstr
	python="${python:-${EPREFIX}/usr/bin/python}"
	tmpstr="$(EPYTHON= ${python} -V 2>&1 )"
	export PYVER_ALL="${tmpstr#Python }"
	export PYVER_MAJOR="${PYVER_ALL:0:1}"
	export PYVER_MINOR="${PYVER_ALL:2:1}"
	if [[ "${PYVER_ALL:3:1}" == "." ]]; then
		export PYVER_MICRO="${PYVER_ALL:4}"
	fi
	export PYVER="${PYVER_MAJOR}.${PYVER_MINOR}"
}

# @FUNCTION: python_mod_compile
# @USAGE: <file> [more files ...]
# @DESCRIPTION:
# Given filenames, it will pre-compile the module's .pyc and .pyo.
# This function should only be run in pkg_postinst()
#
# Example:
#         python_mod_compile /usr/lib/python2.3/site-packages/pygoogle.py
#
python_mod_compile() {
	if ! has "${EAPI:-0}" 0 1 2 || [[ -n "${SUPPORT_PYTHON_ABIS}" ]]; then
		eerror "Use python_mod_optimize() instead of ${FUNCNAME}()."
		die "${FUNCNAME}() cannot be used in this EAPI"
	fi

	_python_initialize_prefix_variables

	local f myroot myfiles=()

	# Check if phase is pkg_postinst()
	[[ ${EBUILD_PHASE} != postinst ]] && die "${FUNCNAME}() should only be run in pkg_postinst()"

	# strip trailing slash
	myroot="${EROOT%/}"

	# respect ROOT
	for f in "$@"; do
		[[ -f "${myroot}/${f}" ]] && myfiles+=("${myroot}/${f}")
	done

	if ((${#myfiles[@]})); then
		"$(PYTHON "${PYTHON_ABI--A}")" "${myroot}$(python_get_libdir)/py_compile.py" "${myfiles[@]}"
		"$(PYTHON "${PYTHON_ABI--A}")" -O "${myroot}$(python_get_libdir)/py_compile.py" "${myfiles[@]}" &> /dev/null
	else
		ewarn "No files to compile!"
	fi
}