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map_flag.go
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/
map_flag.go
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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"bytes"
"fmt"
"sort"
"strings"
)
// stringMapVal implements the flag.Value interface and supports passing key
// value pairs multiple times on the command line.
type stringMapVal map[string]string
func newStringMapVal(m *map[string]string) *stringMapVal {
return (*stringMapVal)(m)
}
func (s *stringMapVal) Set(val string) error {
parts := strings.SplitN(val, "=", 2)
if len(parts) != 2 {
return fmt.Errorf("%q is not formatted as key=value", val)
}
(*s)[parts[0]] = parts[1]
return nil
}
func (s *stringMapVal) String() string {
keys := make([]string, 0, len(*s))
for key := range *s {
keys = append(keys, key)
}
sort.Strings(keys)
var b bytes.Buffer
for i, key := range keys {
if i > 0 {
b.WriteRune(',')
}
b.WriteString(key)
b.WriteRune('=')
b.WriteString((*s)[key])
}
return b.String()
}