# Copyright 1999-2007 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $

# @ECLASS: cmake-utils.eclass
# @MAINTAINER:
# kde@gentoo.org
# @AUTHORS:
# Tomáš Chvátal <scarabeus@gentoo.org>
# Maciej Mrozowski <reavertm@poczta.fm>
# (undisclosed contributors)
# Original author: Zephyrus (zephyrus@mirach.it)
# @BLURB: common ebuild functions for cmake-based packages
# @DESCRIPTION:
# The cmake-utils eclass contains functions that make creating ebuilds for
# cmake-based packages much easier.
# Its main features are support of out-of-source builds as well as in-source
# builds and an implementation of the well-known use_enable and use_with
# functions for CMake.

inherit toolchain-funcs multilib flag-o-matic base

DESCRIPTION="Based on the ${ECLASS} eclass"

DEPEND=">=dev-util/cmake-2.4.6"

case ${EAPI} in
	2)
		EXPORT_FUNCTIONS src_configure src_compile src_test src_install
		;;
	*)
		EXPORT_FUNCTIONS src_compile src_test src_install
		;;
esac

# Internal functions used by cmake-utils_use_*
_use_me_now() {
	debug-print-function ${FUNCNAME} "$@"
	[[ -z $2 ]] && die "cmake-utils_use-$1 <USE flag> [<flag name>]"
	echo "-D$1_${3:-$2}=$(use $2 && echo ON || echo OFF)"
}
_use_me_now_inverted() {
	debug-print-function ${FUNCNAME} "$@"
	[[ -z $2 ]] && die "cmake-utils_use-$1 <USE flag> [<flag name>]"
	echo "-D$1_${3:-$2}=$(use $2 && echo OFF || echo ON)"
}

# @ECLASS-VARIABLE: DOCS
# @DESCRIPTION:
# Documents to pass to dodoc.

# @ECLASS-VARIABLE: PREFIX
# @DESCRIPTION
# Eclass respects PREFIX variable, though it's not recommended way to set
# install/lib/bin prefixes.
# Use -DCMAKE_INSTALL_PREFIX=... CMake variable instead.

# @ECLASS-VARIABLE: CMAKE_IN_SOURCE_BUILD
# @DESCRIPTION:
# Set to enable in-source build.

# @ECLASS-VARIABLE: CMAKE_NO_COLOR
# @DESCRIPTION:
# Set to disable cmake output coloring.

# @ECLASS-VARIABLE: CMAKE_VERBOSE
# @DESCRIPTION:
# Set to enable verbose messages during compilation.

# @ECLASS-VARIABLE: CMAKE_BUILD_TYPE
# @DESCRIPTION:
# Set to override default CMAKE_BUILD_TYPE. Only useful for packages
# known to make use of "if (CMAKE_BUILD_TYPE MATCHES xxx)".
# If about to be set - needs to be set before invoking cmake-utils_src_configure.
# You usualy do *NOT* want nor need to set it as it pulls CMake default build-type
# specific compiler flags overriding make.conf.
: ${CMAKE_BUILD_TYPE:=Gentoo}

# @FUNCTION: _check_build_dir
# @DESCRIPTION:
# Determine using IN or OUT source build
_check_build_dir() {
	# in/out source build
	if [[ -n "${CMAKE_IN_SOURCE_BUILD}" ]]; then
		CMAKE_BUILD_DIR="${S}"
	else
		CMAKE_BUILD_DIR="${WORKDIR}/${PN}_build"
	fi
}
# @FUNCTION: cmake-utils_use_with
# @USAGE: <USE flag> [flag name]
# @DESCRIPTION:
# Based on use_with. See ebuild(5).
#
# `cmake-utils_use_with foo FOO` echoes -DWITH_FOO=ON if foo is enabled
# and -DWITH_FOO=OFF if it is disabled.
cmake-utils_use_with() { _use_me_now WITH "$@" ; }

# @FUNCTION: cmake-utils_use_enable
# @USAGE: <USE flag> [flag name]
# @DESCRIPTION:
# Based on use_enable. See ebuild(5).
#
# `cmake-utils_use_enable foo FOO` echoes -DENABLE_FOO=ON if foo is enabled
# and -DENABLE_FOO=OFF if it is disabled.
cmake-utils_use_enable() { _use_me_now ENABLE "$@" ; }

# @FUNCTION: cmake-utils_use_disable
# @USAGE: <USE flag> [flag name]
# @DESCRIPTION:
# Based on inversion of use_enable. See ebuild(5).
#
# `cmake-utils_use_enable foo FOO` echoes -DDISABLE_FOO=OFF if foo is enabled
# and -DDISABLE_FOO=ON if it is disabled.
cmake-utils_use_disable() { _use_me_now_inverted DISABLE "$@" ; }

# @FUNCTION: cmake-utils_use_no
# @USAGE: <USE flag> [flag name]
# @DESCRIPTION:
# Based on use_disable. See ebuild(5).
#
# `cmake-utils_use_no foo FOO` echoes -DNO_FOO=OFF if foo is enabled
# and -DNO_FOO=ON if it is disabled.
cmake-utils_use_disable() { _use_me_now_inverted NO "$@" ; }

# @FUNCTION: cmake-utils_use_want
# @USAGE: <USE flag> [flag name]
# @DESCRIPTION:
# Based on use_enable. See ebuild(5).
#
# `cmake-utils_use_want foo FOO` echoes -DWANT_FOO=ON if foo is enabled
# and -DWANT_FOO=OFF if it is disabled.
cmake-utils_use_want() { _use_me_now WANT "$@" ; }

# @FUNCTION: cmake-utils_use_build
# @USAGE: <USE flag> [flag name]
# @DESCRIPTION:
# Based on use_enable. See ebuild(5).
#
# `cmake-utils_use_build foo FOO` echoes -DBUILD_FOO=ON if foo is enabled
# and -DBUILD_FOO=OFF if it is disabled.
cmake-utils_use_build() { _use_me_now BUILD "$@" ; }

# @FUNCTION: cmake-utils_has
# @USAGE: <USE flag> [flag name]
# @DESCRIPTION:
# Based on use_enable. See ebuild(5).
#
# `cmake-utils_has foo FOO` echoes -DHAVE_FOO=ON if foo is enabled
# and -DHAVE_FOO=OFF if it is disabled.
cmake-utils_has() { _use_me_now HAVE "$@" ; }

# internal function for modifying hardcoded definitions.
# remove dangerous defintionts that override gentoo settings.
_modify-cmakelists() {
	debug-print-function ${FUNCNAME} "$@"

	# Comment out all set (<some_should_be_user_defined_variable> value)
	# TODO add QA checker - inform when something from avobe is set in CMakeLists.txt
	find "${S}" -name CMakeLists.txt \
		-exec sed -i -e '/^[[:space:]]*[sS][eE][tT][[:space:]]*([[:space:]]*CMAKE_BUILD_TYPE.*)/{s/^/#IGNORE /g}' {} + \
		-exec sed -i -e '/^[[:space:]]*[sS][eE][tT][[:space:]]*([[:space:]]*CMAKE_INSTALL_PREFIX.*)/{s/^/#IGNORE /g}' {} + \
		|| die "${LINENO}: failed to disable hardcoded settings"

	# NOTE append some useful summary here
	echo '
MESSAGE(STATUS "<<< Gentoo configuration >>>
Build type: ${CMAKE_BUILD_TYPE}
Install path: ${CMAKE_INSTALL_PREFIX}\n")' >> CMakeLists.txt
}

# @FUNCTION: cmake-utils_src_configure
# @DESCRIPTION:
# General function for configuring with cmake. Default behaviour is to start an
# out-of-source build.
cmake-utils_src_configure() {
	debug-print-function ${FUNCNAME} "$@"

	# remove dangerous things.
	_modify-cmakelists

	# @SEE CMAKE_BUILD_TYPE
	if [[ ${CMAKE_BUILD_TYPE} = Gentoo ]]; then
		# Handle release builds
		if ! has debug ${IUSE//+} || ! use debug; then
			append-cppflags -DNDEBUG
		fi
	fi

	# Prepare Gentoo override rules (set valid compiler, append CPPFLAGS)
	local build_rules="${TMPDIR}"/gentoo_rules.cmake
cat > ${build_rules} << _EOF_
SET (CMAKE_C_COMPILER $(type -P $(tc-getCC)) CACHE FILEPATH "C compiler" FORCE)
SET (CMAKE_C_COMPILE_OBJECT "<CMAKE_C_COMPILER> <DEFINES> ${CPPFLAGS} <FLAGS> -o <OBJECT> -c <SOURCE>" CACHE STRING "C compile command" FORCE)
SET (CMAKE_CXX_COMPILER $(type -P $(tc-getCXX)) CACHE FILEPATH "C++ compiler" FORCE)
SET (CMAKE_CXX_COMPILE_OBJECT "<CMAKE_CXX_COMPILER> <DEFINES> ${CPPFLAGS} <FLAGS> -o <OBJECT> -c <SOURCE>" CACHE STRING "C++ compile command" FORCE)
_EOF_

	# Common configure parameters (overridable)
	# NOTE CMAKE_BUILD_TYPE can be only overriden via CMAKE_BUILD_TYPE eclass variable
	# No -DCMAKE_BUILD_TYPE=xxx definitions will be in effect.
	local cmakeargs="
		-DCMAKE_INSTALL_PREFIX=${PREFIX:-/usr}
		${mycmakeargs}
		-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
		-DCMAKE_INSTALL_DO_STRIP=OFF
		-DCMAKE_USER_MAKE_RULES_OVERRIDE=${build_rules}"

	# Common configure parameters (invariants)
	local common_config="${TMPDIR}"/gentoo_common_config.cmake
	local libdir=$(get_libdir)
cat > ${common_config} << _EOF_
SET (LIB_SUFFIX ${libdir/lib} CACHE STRING "library path suffix" FORCE)
_EOF_
	[[ -n ${CMAKE_NO_COLOR} ]] && echo 'SET (CMAKE_COLOR_MAKEFILE OFF CACHE BOOL "pretty colors during make" FORCE)' >> ${common_config}
	cmakeargs="-C ${common_config} ${cmakeargs}"

	_check_build_dir
	mkdir -p "${CMAKE_BUILD_DIR}"
	pushd "${CMAKE_BUILD_DIR}" > /dev/null
	debug-print "${LINENO} ${ECLASS} ${FUNCNAME}: mycmakeargs is $cmakeargs"
	cmake ${cmakeargs} "${S}" || die "cmake failed"

	popd > /dev/null
}

# @FUNCTION: cmake-utils_src_compile
# @DESCRIPTION:
# General function for compiling with cmake. Default behaviour is to check for
# eapi and based on it configure or only compile
cmake-utils_src_compile() {
	debug-print-function ${FUNCNAME} "$@"

	case ${EAPI} in
		2) ;;
		*) cmake-utils_src_configure ;;
	esac

	cmake-utils_src_make "$@"
}

# @FUNCTION: cmake-utils_src_configurein
# @DESCRIPTION:
# Deprecated
cmake-utils_src_configurein() {
	ewarn "This ebuild is using deprecated function call: ${FUNCNAME}"
	ewarn "Inform ebuild maintainer."
	cmake-utils_src_configure
}

# @FUNCTION: cmake-utils_src_configureout
# @DESCRIPTION:
# Deprecated
cmake-utils_src_configureout() {
	ewarn "This ebuild is using deprecated function call: ${FUNCNAME}"
	ewarn "Inform ebuild maintainer."
	cmake-utils_src_configure
}

# @FUNCTION: cmake-utils_src_make
# @DESCRIPTION:
# Function for building the package. Automatically detects the build type.
# All arguments are passed to emake:
cmake-utils_src_make() {
	debug-print-function ${FUNCNAME} "$@"

	_check_build_dir
	pushd "${CMAKE_BUILD_DIR}" > /dev/null
	if [[ -n ${CMAKE_VERBOSE} ]]; then
		emake VERBOSE=1 "$@" || die "Make failed!"
	else
		emake "$@" || die "Make failed!"
	fi
	popd > /dev/null
}

# @FUNCTION: cmake-utils_src_install
# @DESCRIPTION:
# Function for installing the package. Automatically detects the build type.
cmake-utils_src_install() {
	debug-print-function ${FUNCNAME} "$@"

	_check_build_dir
	pushd "${CMAKE_BUILD_DIR}" > /dev/null
	emake install DESTDIR="${D}" || die "Make install failed"
	popd > /dev/null

	# Manual document installation
	[[ -n "${DOCS}" ]] && dodoc ${DOCS}
}

# @FUNCTION: cmake-utils_src_test
# @DESCRIPTION:
# Function for testing the package. Automatically detects the build type.
cmake-utils_src_test() {
	debug-print-function ${FUNCNAME} "$@"

	_check_build_dir
	pushd "${CMAKE_BUILD_DIR}" > /dev/null
	# Standard implementation of src_test
	if emake -j1 check -n &> /dev/null; then
		einfo ">>> Test phase [check]: ${CATEGORY}/${PF}"
		if ! emake -j1 check; then
			die "Make check failed. See above for details."
		fi
	elif emake -j1 test -n &> /dev/null; then
		einfo ">>> Test phase [test]: ${CATEGORY}/${PF}"
		if ! emake -j1 test; then
			die "Make test failed. See above for details."
		fi
	else
		einfo ">>> Test phase [none]: ${CATEGORY}/${PF}"
	fi
	popd > /dev/null
}