mirror of https://github.com/k3s-io/k3s
77 lines
2.2 KiB
Go
77 lines
2.2 KiB
Go
// Copyright 2018 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package flags
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import (
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"flag"
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"sort"
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"strings"
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)
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// UniqueStringsValue wraps a list of unique strings.
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// The values are set in order.
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type UniqueStringsValue struct {
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Values map[string]struct{}
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}
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// Set parses a command line set of strings, separated by comma.
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// Implements "flag.Value" interface.
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// The values are set in order.
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func (us *UniqueStringsValue) Set(s string) error {
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us.Values = make(map[string]struct{})
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for _, v := range strings.Split(s, ",") {
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us.Values[v] = struct{}{}
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}
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return nil
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}
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// String implements "flag.Value" interface.
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func (us *UniqueStringsValue) String() string {
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return strings.Join(us.stringSlice(), ",")
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}
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func (us *UniqueStringsValue) stringSlice() []string {
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ss := make([]string, 0, len(us.Values))
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for v := range us.Values {
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ss = append(ss, v)
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}
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sort.Strings(ss)
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return ss
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}
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// NewUniqueStringsValue implements string slice as "flag.Value" interface.
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// Given value is to be separated by comma.
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// The values are set in order.
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func NewUniqueStringsValue(s string) (us *UniqueStringsValue) {
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us = &UniqueStringsValue{Values: make(map[string]struct{})}
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if s == "" {
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return us
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}
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if err := us.Set(s); err != nil {
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plog.Panicf("new UniqueStringsValue should never fail: %v", err)
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}
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return us
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}
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// UniqueStringsFromFlag returns a string slice from the flag.
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func UniqueStringsFromFlag(fs *flag.FlagSet, flagName string) []string {
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return (*fs.Lookup(flagName).Value.(*UniqueStringsValue)).stringSlice()
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}
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// UniqueStringsMapFromFlag returns a map of strings from the flag.
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func UniqueStringsMapFromFlag(fs *flag.FlagSet, flagName string) map[string]struct{} {
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return (*fs.Lookup(flagName).Value.(*UniqueStringsValue)).Values
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}
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