filter: lua: cosmetics

Author: arl

filter/lua_test.go

@@ -25,7 +25,7 @@ end
 	if err != nil {
 		b.Fatal(err)
 	}
-	// fname := filepath.Join(b.TempDir(), "filters.lua")
+
 	fname := filepath.Join(dir, "filters.lua")
 	if err := ioutil.WriteFile(fname, []byte(script), os.ModePerm); err != nil {
 		b.Fatalf("can't write lua script: %v", err)

filter/testdata/lua_test.lua

@@ -1,7 +1,7 @@
+-- use record:get and record:set to swap 2 fields
 function swapFields(rec, next)
-    local f1, f2
-    f1 = rec:get(1)
-    rec:set(1, rec:get(2))
+    local f1, f2 = rec:get(1), rec:get(2)
+    rec:set(1, f2)
     rec:set(2, f1)
     next(rec)
 end