Allow specifying indexing of the main directory and subdirs sepearately

Bug: if we disable indexing in a subdir, it is disabled for all subdirs.

packages/cmake/PrologPackage.cmake

@@ -119,6 +119,7 @@ endif()
   set(v_pl_subdirs)			# list of subdirs
   set(v_pl_gensubdirs)			# list of subdirs (generated files)
   set(v_index ON)
+  set(v_index_subdirs ON)
   set(v_test OFF)
 
   add_custom_target(${target})
@@ -128,8 +129,9 @@ endif()
   foreach(arg ${ARGN})
     if(arg STREQUAL "MODULE")
       set(mode md_module)
-    elseif(arg STREQUAL "NOINDEX")
+    elseif(arg STREQUAL "NOINDEX" AND NOT mode STREQUAL after_subdir)
       set(v_index OFF)
+      set(v_index_subdirs OFF)
     elseif(arg STREQUAL "TEST_ONLY")
       set(v_test ON)
     elseif(arg STREQUAL "SHARED")
@@ -151,7 +153,9 @@ endif()
       set(v_pl_subdir ${arg})
       set(mode after_subdir)
     elseif(mode STREQUAL after_subdir)
-      if(arg STREQUAL "PL_LIBS")
+      if(arg STREQUAL "NOINDEX")
+        set(v_index_subdirs OFF)
+      elseif(arg STREQUAL "PL_LIBS")
 	set(v_pl_subdirs ${v_pl_subdirs} "@${v_pl_subdir}")
 	string(REPLACE "/" "_" subdir_var "v_pl_subdir_${v_pl_subdir}")
 	set(${subdir_var})
@@ -224,7 +228,10 @@ endif()
 		  FILES ${${subdir_var}}
 		  DESTINATION ${SWIPL_INSTALL_LIBRARY}/ext/${SWIPL_PKG}/${sd})
       add_dependencies(${target} ${src_target})
-      if(v_index)
+      if(v_index AND NOT sd)
+        add_index(ext/${SWIPL_PKG}/${sd} ${${subdir_var}})
+      endif()
+      if(v_index_subdirs AND sd)
         add_index(ext/${SWIPL_PKG}/${sd} ${${subdir_var}})
       endif()
     endif()