walk: recursively search for string

walk/walk.go

@@ -7,8 +7,14 @@ import (
 func Walk(x interface{}, fn func(string)) {
 	val := reflect.ValueOf(x)
 	for i := 0; i < val.NumField(); i++ {
-		if val.Field(i).Kind() == reflect.String {
-			fn(val.Field(i).String())
+		field := val.Field(i)
+
+		switch field.Kind() {
+		case reflect.String:
+			fn(field.String())
+		case reflect.Struct:
+			// XXX: Interface() to get interface
+			Walk(field.Interface(), fn)
 		}
 	}
 }

walk/walk_test.go

@@ -34,6 +34,20 @@ func TestWalk(t *testing.T) {
 			}{"Chris", 29},
 			[]string{"Chris"},
 		},
+		{
+			"nested fields",
+			struct {
+				Name    string
+				Profile struct {
+					Age  int
+					City string
+				}
+			}{"Chris", struct {
+				Age  int
+				City string
+			}{29, "London"}},
+			[]string{"Chris", "London"},
+		},
 	}
 
 	for _, test := range cases {