Source/cmake/FindFontconfig.cmake

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#[=======================================================================[.rst:
FindFontconfig
--------------

Find Fontconfig headers and libraries.

Imported Targets
^^^^^^^^^^^^^^^^

``Fontconfig::Fontconfig``
  The Fontconfig library, if found.

Result Variables
^^^^^^^^^^^^^^^^

This will define the following variables in your project:

``Fontconfig_FOUND``
  true if (the requested version of) Fontconfig is available.
``Fontconfig_VERSION``
  the version of Fontconfig.
``Fontconfig_LIBRARIES``
  the libraries to link against to use Fontconfig.
``Fontconfig_INCLUDE_DIRS``
  where to find the Fontconfig headers.
``Fontconfig_COMPILE_OPTIONS``
  this should be passed to target_compile_options(), if the
  target is not used for linking

#]=======================================================================]

# TODO: Remove when cmake_minimum_version bumped to 3.14.

find_package(PkgConfig QUIET)
pkg_check_modules(PC_FONTCONFIG QUIET fontconfig)
set(Fontconfig_COMPILE_OPTIONS ${PC_FONTCONFIG_CFLAGS_OTHER})
set(Fontconfig_VERSION ${PC_FONTCONFIG_CFLAGS_VERSION})

find_path(Fontconfig_INCLUDE_DIR
    NAMES fontconfig/fontconfig.h
    HINTS ${PC_FONTCONFIG_INCLUDEDIR} ${PC_FONTCONFIG_INCLUDE_DIRS} /usr/X11/include
)

find_library(Fontconfig_LIBRARY
    NAMES ${Fontconfig_NAMES} fontconfig
    HINTS ${PC_FONTCONFIG_LIBDIR} ${PC_FONTCONFIG_LIBRARY_DIRS}
)

# Taken from CMake's FindFontconfig.cmake
if (Fontconfig_INCLUDE_DIR AND NOT Fontconfig_VERSION)
  file(STRINGS ${Fontconfig_INCLUDE_DIR}/fontconfig/fontconfig.h _contents REGEX "^#define[ \t]+FC_[A-Z]+[ \t]+[0-9]+$")
  unset(Fontconfig_VERSION)
  foreach (VPART MAJOR MINOR REVISION)
    foreach (VLINE ${_contents})
      if (VLINE MATCHES "^#define[\t ]+FC_${VPART}[\t ]+([0-9]+)$")
        set(Fontconfig_VERSION_PART "${CMAKE_MATCH_1}")
        if (Fontconfig_VERSION)
          string(APPEND Fontconfig_VERSION ".${Fontconfig_VERSION_PART}")
        else ()
          set(Fontconfig_VERSION "${Fontconfig_VERSION_PART}")
        endif ()
      endif ()
    endforeach ()
  endforeach ()
endif ()

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Fontconfig
    FOUND_VAR Fontconfig_FOUND
    REQUIRED_VARS Fontconfig_LIBRARY Fontconfig_INCLUDE_DIR
    VERSION_VAR Fontconfig_VERSION
)

if (Fontconfig_LIBRARY AND NOT TARGET Fontconfig::Fontconfig)
    add_library(Fontconfig::Fontconfig UNKNOWN IMPORTED GLOBAL)
    set_target_properties(Fontconfig::Fontconfig PROPERTIES
        IMPORTED_LOCATION "${Fontconfig_LIBRARY}"
        INTERFACE_COMPILE_OPTIONS "${Fontconfig_COMPILE_OPTIONS}"
        INTERFACE_INCLUDE_DIRECTORIES "${Fontconfig_INCLUDE_DIR}"
    )
endif ()

mark_as_advanced(Fontconfig_INCLUDE_DIR Fontconfig_LIBRARIES)

if (Fontconfig_FOUND)
    set(Fontconfig_LIBRARIES ${Fontconfig_LIBRARY})
    set(Fontconfig_INCLUDE_DIRS ${Fontconfig_INCLUDE_DIR})
endif ()