AP_Scripting: allow loading moduels from ROMFS

libraries/AP_Scripting/lua_bindings.cpp

@@ -920,6 +920,33 @@ int lua_get_current_ref()
     return scripting->get_current_ref();
 }
 
+// This is used when loading modules with require, lua must only look in enabled directory's
+const char* lua_get_modules_path()
+{
+#define LUA_PATH_ROMFS "@ROMFS/scripts/modules/?.lua;" "@ROMFS/scripts/modules/?/init.lua"
+#define LUA_PATH_SCRIPTS LUA_LDIR"?.lua;"  LUA_LDIR"?/init.lua"
+
+    uint16_t dir_disable = AP_Scripting::get_singleton()->get_disabled_dir();
+    dir_disable &= uint16_t(AP_Scripting::SCR_DIR::SCRIPTS) | uint16_t(AP_Scripting::SCR_DIR::ROMFS);
+    if (dir_disable == 0) {
+        // Both directory's are enabled, return both, ROMFS takes priority
+        return LUA_PATH_ROMFS ";" LUA_PATH_SCRIPTS;
+    }
+
+    if ((dir_disable & uint16_t(AP_Scripting::SCR_DIR::SCRIPTS)) == 0) {
+        // Only scripts enabled
+        return LUA_PATH_SCRIPTS;
+    }
+
+    if ((dir_disable & uint16_t(AP_Scripting::SCR_DIR::ROMFS)) == 0) {
+        // Only ROMFS enabled
+        return LUA_PATH_ROMFS;
+    }
+
+    // Nothing enabled?
+    return "";
+}
+
 // Simple print to GCS or over CAN
 int lua_print(lua_State *L) {
     // Only support a single argument