1// Copyright 2018 The Bazel Authors. All rights reserved. 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15// Package flags provides extensions to the built-in flag module. 16package flags 17 18import ( 19 "flag" 20 "strings" 21) 22 23// StringList provides a flag type that parses a,comma,separated,string into a []string. 24type StringList []string 25 26func (i *StringList) String() string { 27 return strings.Join([]string(*i), ",") 28} 29 30// Set sets the flag value. 31func (i *StringList) Set(v string) error { 32 *i = strings.Split(v, ",") 33 return nil 34} 35 36// NewStringList creates a new StringList flag 37// var someFlag = flags.NewStringList("some_name", "some desc") 38func NewStringList(name, help string) *StringList { 39 var r StringList 40 flag.Var(&r, name, help) 41 return &r 42} 43