# Works the same as find_package, but forwards the "REQUIRED" and "QUIET" arguments
# used for the current package. For this to work, the first parameter must be the
# prefix of the current package, then the prefix of the new package etc, which are
# passed to find_package.
macro(libfind_package PREFIX)
	set(LIBFIND_PACKAGE_ARGS $ {ARGN})
	if($ {PREFIX} _FIND_QUIETLY)
		set(LIBFIND_PACKAGE_ARGS $ {LIBFIND_PACKAGE_ARGS} QUIET)
	endif($ {PREFIX} _FIND_QUIETLY)
	if($ {PREFIX} _FIND_REQUIRED)
		set(LIBFIND_PACKAGE_ARGS $ {LIBFIND_PACKAGE_ARGS} REQUIRED)
	endif($ {PREFIX} _FIND_REQUIRED)
	find_package($ {LIBFIND_PACKAGE_ARGS})
endmacro(libfind_package)

# CMake developers made the UsePkgConfig system deprecated in the same release (2.6)
# where they added pkg_check_modules. Consequently I need to support both in my scripts
# to avoid those deprecated warnings. Here's a helper that does just that.
# Works identically to pkg_check_modules, except that no checks are needed prior to use.
macro (libfind_pkg_check_modules PREFIX PKGNAME)
	if (${CMAKE_MAJOR_VERSION} EQUAL 2 AND ${CMAKE_MINOR_VERSION} EQUAL 4)
		include(UsePkgConfig)
		pkgconfig(${PKGNAME} ${PREFIX}_INCLUDE_DIRS ${PREFIX}_LIBRARY_DIRS ${PREFIX}_LDFLAGS ${PREFIX}_CFLAGS)
	else (${CMAKE_MAJOR_VERSION} EQUAL 2 AND ${CMAKE_MINOR_VERSION} EQUAL 4)
		find_package(PkgConfig)
		if (PKG_CONFIG_FOUND)
			pkg_check_modules(${PREFIX} ${PKGNAME})
		endif (PKG_CONFIG_FOUND)
	endif (${CMAKE_MAJOR_VERSION} EQUAL 2 AND ${CMAKE_MINOR_VERSION} EQUAL 4)
endmacro (libfind_pkg_check_modules)

# Do the final processing once the paths have been detected.
# If include dirs are needed, ${PREFIX}_PROCESS_INCLUDES should be set to contain
# all the variables, each of which contain one include directory.
# Ditto for ${PREFIX}_PROCESS_LIBS and library files.
# Will set ${PREFIX}_FOUND, ${PREFIX}_INCLUDE_DIRS and ${PREFIX}_LIBRARIES.
# Also handles errors in case library detection was required, etc.
macro (libfind_process PREFIX)
# Skip processing if already processed during this run
	if (NOT ${PREFIX}_FOUND)
# Start with the assumption that the library was found
		set (${PREFIX}_FOUND TRUE)

# Process all includes and set _FOUND to false if any are missing
		foreach (i ${${PREFIX}_PROCESS_INCLUDES})
			if (${i})
				set (${PREFIX}_INCLUDE_DIRS ${${PREFIX}_INCLUDE_DIRS} ${${i}})
				mark_as_advanced(${i})
			else (${i})
				set (${PREFIX}_FOUND FALSE)
			endif (${i})
		endforeach (i)

# Process all libraries and set _FOUND to false if any are missing
		foreach (i ${${PREFIX}_PROCESS_LIBS})
			if (${i})
				set (${PREFIX}_LIBRARIES ${${PREFIX}_LIBRARIES} ${${i}})
				mark_as_advanced(${i})
			else (${i})
				set (${PREFIX}_FOUND FALSE)
			endif (${i})
		endforeach (i)

# Print message and/or exit on fatal error
		if (${PREFIX}_FOUND)
			if (NOT ${PREFIX}_FIND_QUIETLY)
				message (STATUS "Found ${PREFIX} ${${PREFIX}_VERSION}")
			endif (NOT ${PREFIX}_FIND_QUIETLY)
		else (${PREFIX}_FOUND)
			if (${PREFIX}_FIND_REQUIRED)
				foreach (i ${${PREFIX}_PROCESS_INCLUDES} ${${PREFIX}_PROCESS_LIBS})
					message("${i}=${${i}}")
				endforeach (i)
				message (FATAL_ERROR "Required library ${PREFIX} NOT FOUND.\nInstall the library (dev version) and try again. If the library is already installed, use ccmake to set the missing variables manually.")
			endif (${PREFIX}_FIND_REQUIRED)
		endif (${PREFIX}_FOUND)
	endif (NOT ${PREFIX}_FOUND)
endmacro (libfind_process)

macro(libfind_library PREFIX basename)
	set(TMP "")
	if(MSVC80)
		set(TMP -vc80)
	endif(MSVC80)
	if(MSVC90)
		set(TMP -vc90)
	endif(MSVC90)
	set(${PREFIX}_LIBNAMES ${basename}${TMP})
	if(${ARGC} GREATER 2)
		set(${PREFIX}_LIBNAMES ${basename}${TMP}-${ARGV2})
		string(REGEX REPLACE "\\." "_" TMP ${${PREFIX}_LIBNAMES})
		set(${PREFIX}_LIBNAMES ${${PREFIX}_LIBNAMES} ${TMP})
	endif(${ARGC} GREATER 2)
	find_library(${PREFIX}_LIBRARY
		NAMES ${${PREFIX}_LIBNAMES}
		PATHS ${${PREFIX}_PKGCONF_LIBRARY_DIRS})
endmacro(libfind_library)

SET(THREE_PART_VERSION_REGEX "[0-9]+\\.[0-9]+\\.[0-9]+")
# Breaks up a string in the form n1.n2.n3 into three parts and stores
# them in major, minor, and patch.	version should be a value, not a
# variable, while major, minor and patch should be variables.
MACRO(THREE_PART_VERSION_TO_VARS version major minor patch)
	IF(${version} MATCHES ${THREE_PART_VERSION_REGEX})
		STRING(REPLACE "." " " version_list ${version})
		SEPARATE_ARGUMENTS(version_list)
		LIST(GET version_list 0 ${major})
		LIST(GET version_list 1 ${minor})
		LIST(GET version_list 2 ${patch})
	ELSE(${version} MATCHES ${THREE_PART_VERSION_REGEX})
		MESSAGE("MACRO(THREE_PART_VERSION_TO_VARS ${version} ${major} ${minor} ${patch}")
		MESSAGE(FATAL_ERROR "Problem parsing version string, I can't parse it properly.")
	ENDIF(${version} MATCHES ${THREE_PART_VERSION_REGEX})
ENDMACRO(THREE_PART_VERSION_TO_VARS)


