add lua search path

libs/ardour/ardour/directory_names.h

@@ -46,6 +46,7 @@ namespace ARDOUR {
 	LIBARDOUR_API extern const char* const analysis_dir_name;
 	LIBARDOUR_API extern const char* const plugins_dir_name;
 	LIBARDOUR_API extern const char* const externals_dir_name;
+	LIBARDOUR_API extern const char* const lua_dir_name;
 
 };
 

libs/ardour/ardour/search_paths.h

@@ -107,6 +107,14 @@ namespace ARDOUR {
 	 */
 	LIBARDOUR_API PBD::Searchpath template_search_path ();
 
+
+	/**
+	 * return a Searchpath containing directories in which to look for
+	 * lua scripts
+	 */
+	LIBARDOUR_API PBD::Searchpath lua_search_path ();
+
+
 } // namespace ARDOUR
 
 #endif /* __libardour_search_paths_h__ */

libs/ardour/directory_names.cc

@@ -43,5 +43,6 @@ const char* const automation_dir_name = X_("automation");
 const char* const analysis_dir_name = X_("analysis");
 const char* const plugins_dir_name = X_("plugins");
 const char* const externals_dir_name = X_("externals");
+const char* const lua_dir_name = X_("scripts");
 
 }

libs/ardour/search_paths.cc

@@ -163,6 +163,15 @@ route_template_search_path ()
 	return spath;
 }
 
+Searchpath
+lua_search_path ()
+{
+	Searchpath spath (ardour_data_search_path());
+	spath.add_subdirectory_to_paths(lua_dir_name);
+
+	return spath;
+}
+
 #ifdef PLATFORM_WINDOWS
 
 const char*