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53 lines
1.5 KiB
Go
53 lines
1.5 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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// StringsValue wraps "sort.StringSlice".
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type StringsValue sort.StringSlice
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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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func (ss *StringsValue) Set(s string) error {
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*ss = strings.Split(s, ",")
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return nil
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}
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// String implements "flag.Value" interface.
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func (ss *StringsValue) String() string { return strings.Join(*ss, ",") }
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// NewStringsValue implements string slice as "flag.Value" interface.
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// Given value is to be separated by comma.
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func NewStringsValue(s string) (ss *StringsValue) {
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if s == "" {
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return &StringsValue{}
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}
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ss = new(StringsValue)
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if err := ss.Set(s); err != nil {
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plog.Panicf("new StringsValue should never fail: %v", err)
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}
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return ss
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}
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// StringsFromFlag returns a string slice from the flag.
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func StringsFromFlag(fs *flag.FlagSet, flagName string) []string {
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return []string(*fs.Lookup(flagName).Value.(*StringsValue))
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}
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