FindGL2PS: create imported targets

CMake/FindGL2PS.cmake

-# - Find GL2PS library
-# Find the native GL2PS includes and library
-# This module defines
-#  GL2PS_INCLUDE_DIR, where to find tiff.h, etc.
-#  GL2PS_LIBRARIES, libraries to link against to use GL2PS.
-#  GL2PS_FOUND, If false, do not try to use GL2PS.
-# also defined, but not for general use are
-#  GL2PS_LIBRARY, where to find the GL2PS library.
+find_path(GL2PS_INCLUDE_DIR
+  NAMES gl2ps.h
+  DOC "gl2ps include directories")
+mark_as_advanced(GL2PS_INCLUDE_DIR)
 
-#=============================================================================
-# Copyright 2009 Kitware, Inc.
-# Copyright 2009 Mathieu Malaterre <mathieu.malaterre@gmail.com>
-#
-# Distributed under the OSI-approved BSD License (the "License");
-# see accompanying file Copyright.txt for details.
-#
-# This software is distributed WITHOUT ANY WARRANTY; without even the
-# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-# See the License for more information.
-#=============================================================================
-# (To distributed this file outside of CMake, substitute the full
-#  License text for the above reference.)
+find_library(GL2PS_LIBRARY
+  NAMES gl2ps
+  DOC "gl2ps library")
+mark_as_advanced(GL2PS_LIBRARY)
 
-find_path(GL2PS_INCLUDE_DIR gl2ps.h)
+if (GL2PS_INCLUDE_DIR)
+  file(STRINGS "${GL2PS_INCLUDE_DIR}/gl2ps.h" _gl2ps_version_lines REGEX "#define[ \t]+GL2PS_(MAJOR|MINOR|PATCH)_VERSION[ \t]+")
+  string(REGEX REPLACE ".*GL2PS_MAJOR_VERSION *\([0-9]*\).*" "\\1" _gl2ps_version_major "${_gl2ps_version_lines}")
+  string(REGEX REPLACE ".*GL2PS_MINOR_VERSION *\([0-9]*\).*" "\\1" _gl2ps_version_minor "${_gl2ps_version_lines}")
+  string(REGEX REPLACE ".*GL2PS_PATCH_VERSION *\([0-9]*\).*" "\\1" _gl2ps_version_patch "${_gl2ps_version_lines}")
+  set(GL2PS_VERSION "${_gl2ps_version_major}.${_gl2ps_version_minor}.${_gl2ps_version_patch}")
+  unset(_gl2ps_version_major)
+  unset(_gl2ps_version_minor)
+  unset(_gl2ps_version_patch)
+  unset(_gl2ps_version_lines)
+endif ()
 
-find_library(GL2PS_LIBRARY NAMES gl2ps)
-
-if(GL2PS_INCLUDE_DIR)
-  file(STRINGS "${GL2PS_INCLUDE_DIR}/gl2ps.h" _GL2PS_H_CONTENTS REGEX "#define[ \t]+GL2PS_(MAJOR|MINOR|PATCH)_VERSION[ \t]+")
-  foreach(v MAJOR MINOR PATCH)
-    if("${_GL2PS_H_CONTENTS}" MATCHES "#define[ \t]+GL2PS_${v}_VERSION[ \t]+([0-9]+)")
-      set(GL2PS_${v}_VERSION "${CMAKE_MATCH_1}")
-    else()
-      set(GL2PS_${v}_VERSION 0)
-    endif()
-  endforeach()
-  unset(_GL2PS_H_CONTENTS)
-  set(GL2PS_VERSION "${GL2PS_MAJOR_VERSION}.${GL2PS_MINOR_VERSION}.${GL2PS_PATCH_VERSION}")
-endif()
-
-# handle the QUIETLY and REQUIRED arguments and set GL2PS_FOUND to TRUE if
-# all listed variables are TRUE
 include(FindPackageHandleStandardArgs)
 find_package_handle_standard_args(GL2PS
   REQUIRED_VARS GL2PS_LIBRARY GL2PS_INCLUDE_DIR
-  VERSION_VAR GL2PS_VERSION
-  )
+  VERSION_VAR GL2PS_VERSION)
 
-if(GL2PS_FOUND)
-  set( GL2PS_LIBRARIES ${GL2PS_LIBRARY} )
-endif()
+if (GL2PS_FOUND)
+  set(GL2PS_INCLUDE_DIRS "${GL2PS_INCLUDE_DIR}")
+  set(GL2PS_LIBRARIES "${GL2PS_LIBRARY}")
 
-mark_as_advanced(GL2PS_INCLUDE_DIR GL2PS_LIBRARY)
+  if (NOT TARGET GL2PS::GL2PS)
+    add_library(GL2PS::GL2PS UNKNOWN IMPORTED)
+    set_target_properties(GL2PS::GL2PS PROPERTIES
+      IMPORTED_LOCATION "${GL2PS_LIBRARY}"
+      INTERFACE_INCLUDE_DIRECTORIES "${GL2PS_INCLUDE_DIR}")
+  endif ()
+endif ()