cmake/FindMETIS.cmake

#
# Copyright (c) 2025 Sergiu Deitsch
#
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# in the Software without restriction, including without limitation the rights
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# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
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#
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# SOFTWARE.
#
#[=======================================================================[.rst:
Module for locating METIS
=========================

Read-only variables:

``METIS_FOUND``
  Indicates whether the library has been found.

``METIS_VERSION``
  Indicates library version.

Targets
-------

``METIS::METIS``
  Specifies targets that should be passed to target_link_libararies.
]=======================================================================]

include (FindPackageHandleStandardArgs)

find_path (METIS_INCLUDE_DIR NAMES metis.h
  PATH_SUFFIXES include
  DOC "METIS include directory")
find_library (METIS_LIBRARY_DEBUG NAMES metis
  PATH_SUFFIXES Debug
  DOC "METIS debug library")
find_library (METIS_LIBRARY_RELEASE NAMES metis
  PATH_SUFFIXES Release
  DOC "METIS release library")

if (METIS_LIBRARY_RELEASE)
  if (METIS_LIBRARY_DEBUG)
    set (METIS_LIBRARY debug ${METIS_LIBRARY_DEBUG} optimized
      ${METIS_LIBRARY_RELEASE} CACHE STRING "METIS library")
  else (METIS_LIBRARY_DEBUG)
    set (METIS_LIBRARY ${METIS_LIBRARY_RELEASE} CACHE FILEPATH "METIS library")
  endif (METIS_LIBRARY_DEBUG)
elseif (METIS_LIBRARY_DEBUG)
  set (METIS_LIBRARY ${METIS_LIBRARY_DEBUG} CACHE FILEPATH "METIS library")
endif (METIS_LIBRARY_RELEASE)

set (_METIS_VERSION_HEADER ${METIS_INCLUDE_DIR}/metis.h)

if (EXISTS ${_METIS_VERSION_HEADER})
  file (READ ${_METIS_VERSION_HEADER} _METIS_VERSION_CONTENTS)

  string (REGEX REPLACE ".*#define METIS_VER_MAJOR[ \t]+([0-9]+).*" "\\1"
    METIS_VERSION_MAJOR "${_METIS_VERSION_CONTENTS}")
  string (REGEX REPLACE ".*#define METIS_VER_MINOR[ \t]+([0-9]+).*" "\\1"
    METIS_VERSION_MINOR "${_METIS_VERSION_CONTENTS}")
  string (REGEX REPLACE ".*#define METIS_VER_SUBMINOR[ \t]+([0-9]+).*" "\\1"
    METIS_VERSION_PATCH "${_METIS_VERSION_CONTENTS}")

  set (METIS_VERSION
    ${METIS_VERSION_MAJOR}.${METIS_VERSION_MINOR}.${METIS_VERSION_PATCH})
  set (METIS_VERSION_COMPONENTS 3)
endif (EXISTS ${_METIS_VERSION_HEADER})

mark_as_advanced (METIS_INCLUDE_DIR METIS_LIBRARY_DEBUG METIS_LIBRARY_RELEASE
  METIS_LIBRARY)

if (NOT TARGET METIS::METIS)
  if (METIS_INCLUDE_DIR OR METIS_LIBRARY)
    add_library (METIS::METIS IMPORTED UNKNOWN)
  endif (METIS_INCLUDE_DIR OR METIS_LIBRARY)
endif (NOT TARGET METIS::METIS)

if (METIS_INCLUDE_DIR)
  set_property (TARGET METIS::METIS PROPERTY INTERFACE_INCLUDE_DIRECTORIES
    ${METIS_INCLUDE_DIR})
endif (METIS_INCLUDE_DIR)

# METIS_LIBRARY takes precedence since it can also be provided by the user.
# Configuration specific locations are used only if it refers to both the
# debug and the release library.
if (METIS_LIBRARY MATCHES "^(debug|optimized);")
  set_property (TARGET METIS::METIS PROPERTY IMPORTED_LOCATION_RELEASE
    ${METIS_LIBRARY_RELEASE})
  set_property (TARGET METIS::METIS PROPERTY IMPORTED_LOCATION_DEBUG
    ${METIS_LIBRARY_DEBUG})
  set_property (TARGET METIS::METIS APPEND PROPERTY IMPORTED_CONFIGURATIONS
    RELEASE DEBUG)
elseif (METIS_LIBRARY)
  set_property (TARGET METIS::METIS PROPERTY IMPORTED_LOCATION
    ${METIS_LIBRARY})
endif (METIS_LIBRARY MATCHES "^(debug|optimized);")

find_package_handle_standard_args (METIS REQUIRED_VARS
  METIS_INCLUDE_DIR METIS_LIBRARY VERSION_VAR METIS_VERSION)