# 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)
