Separate Catch2Config from targets

This lets us add the installed helper scripts to the cmake module
path, letting CMake users just include them after requiring Catch2
package.

CMake/Catch2Config.cmake.in

@@ -0,0 +1,10 @@
+@PACKAGE_INIT@
+
+
+# Avoid repeatedly including the targets
+if(NOT TARGET Catch2::Catch2)
+    # Provide path for scripts
+    list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}")
+
+    include(${CMAKE_CURRENT_LIST_DIR}/Catch2Targets.cmake)
+endif()

CMakeLists.txt

@@ -84,18 +84,29 @@ add_library(Catch2::Catch2 ALIAS Catch2)
 
 set(CATCH_CMAKE_CONFIG_DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/Catch2")
 
+include(CMakePackageConfigHelpers)
+configure_package_config_file(
+    ${CMAKE_CURRENT_LIST_DIR}/CMake/Catch2Config.cmake.in
+    ${CMAKE_CURRENT_BINARY_DIR}/Catch2Config.cmake
+    INSTALL_DESTINATION
+      ${CATCH_CMAKE_CONFIG_DESTINATION}
+)
+
+
 # create and install an export set for catch target as Catch2::Catch
 install(
   TARGETS
     Catch2
   EXPORT
-    Catch2Config
+    Catch2Targets
-  DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  DESTINATION
+    ${CMAKE_INSTALL_LIBDIR}
 )
 
+
 install(
   EXPORT
-    Catch2Config
+    Catch2Targets
   NAMESPACE
     Catch2::
   DESTINATION
@@ -117,6 +128,7 @@ install(
     
 install(
   FILES 
+    "${CMAKE_CURRENT_BINARY_DIR}/Catch2Config.cmake"
     "${CMAKE_CURRENT_BINARY_DIR}/Catch2ConfigVersion.cmake"
   DESTINATION
     ${CATCH_CMAKE_CONFIG_DESTINATION}