# Copyright 1999-2015 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$

# @ECLASS: waf-utils.eclass
# @MAINTAINER:
# maintainer-needed@gentoo.org
# @AUTHOR:
# Original Author: Gilles Dartiguelongue <eva@gentoo.org>
# Various improvements based on cmake-utils.eclass: Tomáš Chvátal <scarabeus@gentoo.org>
# Proper prefix support: Jonathan Callen <jcallen@gentoo.org>
# @BLURB: common ebuild functions for waf-based packages
# @DESCRIPTION:
# The waf-utils eclass contains functions that make creating ebuild for
# waf-based packages much easier.
# Its main features are support of common portage default settings.

inherit eutils multilib toolchain-funcs multiprocessing

case ${EAPI:-0} in
	4|5|6) EXPORT_FUNCTIONS src_configure src_compile src_install ;;
	*) die "EAPI=${EAPI} is not supported" ;;
esac

# Python with threads is required to run waf. We do not know which python slot
# is being used as the system interpreter, so we are forced to block all
# slots that have USE=-threads.
DEPEND="${DEPEND}
	dev-lang/python
	!dev-lang/python[-threads]"

# @ECLASS-VARIABLE: WAF_VERBOSE
# @DESCRIPTION:
# Set to OFF to disable verbose messages during compilation
# this is _not_ meant to be set in ebuilds
: ${WAF_VERBOSE:=ON}

# @FUNCTION: waf-utils_src_configure
# @DESCRIPTION:
# General function for configuring with waf.
waf-utils_src_configure() {
	debug-print-function ${FUNCNAME} "$@"

	local fail
	if [[ ! ${_PYTHON_ANY_R1} && ! ${_PYTHON_SINGLE_R1} && ! ${_PYTHON_R1} ]]; then
		eerror "Using waf-utils.eclass without any python-r1 suite eclass is not supported."
		eerror "Please make sure to configure and inherit appropriate -r1 eclass."
		eerror "For more information and examples, please see:"
		eerror "    https://wiki.gentoo.org/wiki/Project:Python/waf-utils_integration"
		fail=1
	else
		if [[ ! ${EPYTHON} ]]; then
			eerror "EPYTHON is unset while calling waf-utils. This most likely means that"
			eerror "the ebuild did not call the appropriate eclass function before calling waf."
			if [[ ${_PYTHON_ANY_R1} ]]; then
				eerror "Please ensure that python-any-r1_pkg_setup is called in pkg_setup()."
			elif [[ ${_PYTHON_SINGLE_R1} ]]; then
				eerror "Please ensure that python-single-r1_pkg_setup is called in pkg_setup()."
			else # python-r1
				eerror "Please ensure that python_setup is called before waf-utils_src_configure(),"
				eerror "or that the latter is used within python_foreach_impl as appropriate."
			fi
			eerror
			fail=1
		fi

		if [[ ${PYTHON_REQ_USE} != *threads* ]]; then
			eerror "Waf requires threading support in Python. To accomodate this requirement,"
			eerror "please add 'threads(+)' to PYTHON_REQ_USE variable (above inherit line)."
			eerror "For more information and examples, please see:"
			eerror "    https://wiki.gentoo.org/wiki/Project:Python/waf-utils_integration"
			fail=1
		fi
	fi

	[[ ${fail} ]] || die "Invalid use of ${ECLASS}"

	local libdir=""

	# @ECLASS-VARIABLE: WAF_BINARY
	# @DESCRIPTION:
	# Eclass can use different waf executable. Usually it is located in "${S}/waf".
	: ${WAF_BINARY:="${S}/waf"}

	# @ECLASS-VARIABLE: NO_WAF_LIBDIR
	# @DEFAULT_UNSET
	# @DESCRIPTION:
	# Variable specifying that you don't want to set the libdir for waf script.
	# Some scripts does not allow setting it at all and die if they find it.
	[[ -z ${NO_WAF_LIBDIR} ]] && libdir="--libdir=${EPREFIX}/usr/$(get_libdir)"

	tc-export AR CC CPP CXX RANLIB
	echo "CCFLAGS=\"${CFLAGS}\" LINKFLAGS=\"${CFLAGS} ${LDFLAGS}\" \"${WAF_BINARY}\" --prefix=${EPREFIX}/usr ${libdir} $@ configure"

	# This condition is required because waf takes even whitespace as function
	# calls, awesome isn't it?
	if [[ -z ${NO_WAF_LIBDIR} ]]; then
		CCFLAGS="${CFLAGS}" LINKFLAGS="${CFLAGS} ${LDFLAGS}" "${WAF_BINARY}" \
			"--prefix=${EPREFIX}/usr" \
			"${libdir}" \
			"$@" \
			configure || die "configure failed"
	else
		CCFLAGS="${CFLAGS}" LINKFLAGS="${CFLAGS} ${LDFLAGS}" "${WAF_BINARY}" \
			"--prefix=${EPREFIX}/usr" \
			"$@" \
			configure || die "configure failed"
	fi
}

# @FUNCTION: waf-utils_src_compile
# @DESCRIPTION:
# General function for compiling with waf.
waf-utils_src_compile() {
	debug-print-function ${FUNCNAME} "$@"
	local _mywafconfig
	[[ "${WAF_VERBOSE}" ]] && _mywafconfig="--verbose"

	local jobs="--jobs=$(makeopts_jobs)"
	echo "\"${WAF_BINARY}\" build ${_mywafconfig} ${jobs}"
	"${WAF_BINARY}" ${_mywafconfig} ${jobs} || die "build failed"
}

# @FUNCTION: waf-utils_src_install
# @DESCRIPTION:
# Function for installing the package.
waf-utils_src_install() {
	debug-print-function ${FUNCNAME} "$@"

	echo "\"${WAF_BINARY}\" --destdir=\"${D}\" install"
	"${WAF_BINARY}" --destdir="${D}" install  || die "Make install failed"

	# Manual document installation
	einstalldocs
}