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# Copyright 1999-2013 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/eclass/python-any-r1.eclass,v 1.6 2013/01/21 19:28:16 mgorny Exp $
# @ECLASS: python-any-r1
# @MAINTAINER:
# Python team <python@gentoo.org>
# @AUTHOR:
# Author: Michał Górny <mgorny@gentoo.org>
# Based on work of: Krzysztof Pawlik <nelchael@gentoo.org>
# @BLURB: An eclass for packages having build-time dependency on Python.
# @DESCRIPTION:
# A minimal eclass for packages which need any Python interpreter
# installed without a need for explicit choice and invariability.
# This usually involves packages requiring Python at build-time
# but having no other relevance to it.
#
# This eclass provides a minimal PYTHON_DEPS variable with a dependency
# string on any of the supported Python implementations. It also exports
# pkg_setup() which finds the best supported implementation and sets it
# as the active one.
#
# Please note that python-any-r1 will always inherit python-utils-r1
# as well. Thus, all the functions defined there can be used in the
# packages using python-any-r1, and there is no need ever to inherit
# both.
#
# For more information, please see the python-r1 Developer's Guide:
# http://www.gentoo.org/proj/en/Python/python-r1/dev-guide.xml
case "${EAPI:-0}" in
0|1|2|3|4|5)
# EAPI=4 needed by python-r1
;;
*)
die "Unsupported EAPI=${EAPI} (unknown) for ${ECLASS}"
;;
esac
if [[ ! ${_PYTHON_ANY_R1} ]]; then
if [[ ${_PYTHON_R1} ]]; then
die 'python-any-r1.eclass can not be used with python-r1.eclass.'
elif [[ ${_PYTHON_SINGLE_R1} ]]; then
die 'python-any-r1.eclass can not be used with python-single-r1.eclass.'
fi
inherit python-utils-r1
fi
EXPORT_FUNCTIONS pkg_setup
if [[ ! ${_PYTHON_ANY_R1} ]]; then
# @ECLASS-VARIABLE: PYTHON_COMPAT
# @REQUIRED
# @DESCRIPTION:
# This variable contains a list of Python implementations the package
# supports. It must be set before the `inherit' call. It has to be
# an array.
#
# Example:
# @CODE
# PYTHON_COMPAT=( python{2_5,2_6,2_7} )
# @CODE
if ! declare -p PYTHON_COMPAT &>/dev/null; then
die 'PYTHON_COMPAT not declared.'
fi
# @ECLASS-VARIABLE: PYTHON_REQ_USE
# @DEFAULT_UNSET
# @DESCRIPTION:
# The list of USEflags required to be enabled on the Python
# implementations, formed as a USE-dependency string. It should be valid
# for all implementations in PYTHON_COMPAT, so it may be necessary to
# use USE defaults.
#
# Example:
# @CODE
# PYTHON_REQ_USE="gdbm,ncurses(-)?"
# @CODE
#
# It will cause the Python dependencies to look like:
# @CODE
# || ( dev-lang/python:X.Y[gdbm,ncurses(-)?] ... )
# @CODE
# @ECLASS-VARIABLE: PYTHON_DEPS
# @DESCRIPTION:
# This is an eclass-generated Python dependency string for all
# implementations listed in PYTHON_COMPAT.
#
# Any of the supported interpreters will satisfy the dependency.
#
# Example use:
# @CODE
# DEPEND="${RDEPEND}
# ${PYTHON_DEPS}"
# @CODE
#
# Example value:
# @CODE
# || ( dev-lang/python:2.7[gdbm]
# dev-lang/python:2.6[gdbm] )
# @CODE
_python_build_set_globals() {
local usestr
[[ ${PYTHON_REQ_USE} ]] && usestr="[${PYTHON_REQ_USE}]"
PYTHON_DEPS=
local i
for i in "${_PYTHON_ALL_IMPLS[@]}"; do
if has "${i}" "${PYTHON_COMPAT[@]}"
then
local d
case ${i} in
python*)
d='dev-lang/python';;
jython*)
d='dev-java/jython';;
pypy*)
d='dev-python/pypy';;
*)
die "Invalid implementation: ${i}"
esac
local v=${i##*[a-z]}
PYTHON_DEPS="${d}:${v/_/.}${usestr} ${PYTHON_DEPS}"
fi
done
PYTHON_DEPS="|| ( ${PYTHON_DEPS})"
}
_python_build_set_globals
# @FUNCTION: _python_EPYTHON_supported
# @USAGE: <epython>
# @INTERNAL
# @DESCRIPTION:
# Check whether the specified implementation is supported by package
# (specified in PYTHON_COMPAT).
_python_EPYTHON_supported() {
debug-print-function ${FUNCNAME} "${@}"
local i=${1/./_}
case "${i}" in
python*|jython*)
;;
pypy-c*)
i=${i/-c/}
;;
*)
ewarn "Invalid EPYTHON: ${EPYTHON}"
return 1
;;
esac
if has "${i}" "${PYTHON_COMPAT[@]}"; then
return 0
elif ! has "${i}" "${_PYTHON_ALL_IMPLS[@]}"; then
ewarn "Invalid EPYTHON: ${EPYTHON}"
fi
return 1
}
# @FUNCTION: python-any-r1_pkg_setup
# @DESCRIPTION:
# Determine what the best installed (and supported) Python
# implementation is and set EPYTHON and PYTHON accordingly.
python-any-r1_pkg_setup() {
debug-print-function ${FUNCNAME} "${@}"
# first, try ${EPYTHON}... maybe it's good enough for us.
if [[ ${EPYTHON} ]]; then
if _python_EPYTHON_supported "${EPYTHON}"; then
python_export EPYTHON PYTHON
return
fi
fi
# then, try eselect-python
local variant i
for variant in '' '--python2' '--python3'; do
i=$(eselect python --show ${variant} 2>/dev/null)
if [[ ! ${i} ]]; then
# no eselect-python?
break
elif _python_EPYTHON_supported "${i}"; then
python_export "${i}" EPYTHON PYTHON
return
fi
done
# fallback to best installed impl.
local rev_impls=()
for i in "${_PYTHON_ALL_IMPLS[@]}"; do
if has "${i}" "${PYTHON_COMPAT[@]}"; then
rev_impls=( "${i}" "${rev_impls[@]}" )
fi
done
local PYTHON_PKG_DEP
for i in "${rev_impls[@]}"; do
python_export "${i}" PYTHON_PKG_DEP EPYTHON PYTHON
ROOT=/ has_version "${PYTHON_PKG_DEP}" && return
done
}
_PYTHON_ANY_R1=1
fi
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