~donadigo/switchboard/deep-search

##

# Copyright 2009-2010 Jakob Westhoff. All rights reserved.

# 

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions are met:

# 

#    1. Redistributions of source code must retain the above copyright notice,

#       this list of conditions and the following disclaimer.

# 

#    2. Redistributions in binary form must reproduce the above copyright notice,

#       this list of conditions and the following disclaimer in the documentation

#       and/or other materials provided with the distribution.

# 

# THIS SOFTWARE IS PROVIDED BY JAKOB WESTHOFF ``AS IS'' AND ANY EXPRESS OR

# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO

# EVENT SHALL JAKOB WESTHOFF OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,

# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE

# OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# 

# The views and conclusions contained in the software and documentation are those

# of the authors and should not be interpreted as representing official policies,

# either expressed or implied, of Jakob Westhoff

##

include(ParseArguments)

find_package(Vala REQUIRED)

##

# Ensure a certain valac version is available

#

# The initial argument is the version to check for

# 

# It may be followed by a optional parameter to specifiy a version range. The

# following options are valid:

# 

# EXACT

#   Vala needs to be available in the exact version given

# 

# MINIMUM

#   The provided version is the minimum version. Therefore Vala needs to be

#   available in the given version or any higher version

#

# MAXIMUM

#   The provided version is the maximum. Therefore Vala needs to be available

#   in the given version or any version older than this

#

# If no option is specified the version will be treated as a minimal version.

##

macro(ensure_vala_version version)

    parse_arguments(ARGS "" "MINIMUM;MAXIMUM;EXACT" ${ARGN})

	set(compare_message "")

	set(error_message "")

	if(ARGS_MINIMUM)

		set(compare_message "a minimum ")

		set(error_message "or greater ")

	elseif(ARGS_MAXIMUM)

		set(compare_message "a maximum ")

		set(error_message "or less ")

	endif(ARGS_MINIMUM)

	message(STATUS 

		"checking for ${compare_message}Vala version of ${version}"

	)

	unset(version_accepted)

	# MINIMUM is the default if no option is specified

	if(ARGS_EXACT)

		if(${VALA_VERSION} VERSION_EQUAL ${version} )

			set(version_accepted TRUE)	

		endif(${VALA_VERSION} VERSION_EQUAL ${version})

	elseif(ARGS_MAXIMUM)

		if(${VALA_VERSION} VERSION_LESS ${version} OR ${VALA_VERSION} VERSION_EQUAL ${version})

			set(version_accepted TRUE)	

		endif(${VALA_VERSION} VERSION_LESS ${version} OR ${VALA_VERSION} VERSION_EQUAL ${version})

	else(ARGS_MAXIMUM)

		if(${VALA_VERSION} VERSION_GREATER ${version} OR ${VALA_VERSION} VERSION_EQUAL ${version})

			set(version_accepted TRUE)	

		endif(${VALA_VERSION} VERSION_GREATER ${version} OR ${VALA_VERSION} VERSION_EQUAL ${version})

	endif(ARGS_EXACT)

	if (NOT version_accepted)

		message(FATAL_ERROR 

			"Vala version ${version} ${error_message}is required."

		)

	endif(NOT version_accepted)

	message(STATUS

		"  found Vala, version ${VALA_VERSION}"

	)

endmacro(ensure_vala_version)