degesch: add a stubbed Lua plugin loader

CMakeLists.txt

@@ -38,6 +38,20 @@ list (APPEND project_libraries ${libssl_LIBRARIES})
 include_directories (${libssl_INCLUDE_DIRS})
 link_directories (${libssl_LIBRARY_DIRS})
 
+# FIXME: other Lua versions may be acceptable, don't know yet
+pkg_search_module (lua lua5.3 lua-5.3 lua>=5.3)
+option (WITH_LUA "Enable experimental support for Lua plugins" ${lua_FOUND})
+
+if (WITH_LUA)
+	if (NOT lua_FOUND)
+		message (FATAL_ERROR "Lua library not found")
+	endif (NOT lua_FOUND)
+
+	list (APPEND project_libraries ${lua_LIBRARIES})
+	include_directories (${lua_INCLUDE_DIRS})
+	link_directories (${lua_LIBRARY_DIRS})
+endif (WITH_LUA)
+
 # -lpthread is only there for debugging (gdb & errno)
 # -lrt is only for glibc < 2.17
 # -liconv may or may not be a part of libc
@@ -75,13 +89,9 @@ elseif (WANT_LIBEDIT)
 endif ((WANT_READLINE AND WANT_LIBEDIT) OR (NOT WANT_READLINE AND NOT WANT_LIBEDIT))
 
 # Generate a configuration file
-if (WANT_READLINE)
-	set (HAVE_READLINE 1)
-endif (WANT_READLINE)
-
-if (WANT_LIBEDIT)
-	set (HAVE_EDITLINE 1)
-endif (WANT_LIBEDIT)
+set (HAVE_READLINE "${WANT_READLINE}")
+set (HAVE_EDITLINE "${WANT_LIBEDIT}")
+set (HAVE_LUA      "${WITH_LUA}")
 
 include (GNUInstallDirs)
 set (plugin_dir ${CMAKE_INSTALL_LIBDIR}/${PROJECT_NAME})