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map_string_bool.go
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/
map_string_bool.go
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// Copyright © 2023 OpenIM-Sigs open source community. All rights reserved.
// Use of this source code is governed by a MIT style
// license that can be found in the LICENSE file.
package flag
import (
"fmt"
"sort"
"strconv"
"strings"
)
// MapStringBool can be set from the command line with the format `--flag "string=bool"`.
// Multiple comma-separated key-value pairs in a single invocation are supported. For example: `--flag
// "a=true,b=false"`.
// Multiple flag invocations are supported. For example: `--flag "a=true" --flag "b=false"`.
type MapStringBool struct {
Map *map[string]bool
initialized bool
}
// NewMapStringBool takes a pointer to a map[string]string and returns the
// MapStringBool flag parsing shim for that map.
func NewMapStringBool(m *map[string]bool) *MapStringBool {
return &MapStringBool{Map: m}
}
// String implements github.com/spf13/pflag.Value.
func (m *MapStringBool) String() string {
if m == nil || m.Map == nil {
return ""
}
pairs := []string{}
for k, v := range *m.Map {
pairs = append(pairs, fmt.Sprintf("%s=%t", k, v))
}
sort.Strings(pairs)
return strings.Join(pairs, ",")
}
// Set implements github.com/spf13/pflag.Value.
func (m *MapStringBool) Set(value string) error {
if m.Map == nil {
return fmt.Errorf("no target (nil pointer to map[string]bool)")
}
if !m.initialized || *m.Map == nil {
// clear default values, or allocate if no existing map
*m.Map = make(map[string]bool)
m.initialized = true
}
for _, s := range strings.Split(value, ",") {
if len(s) == 0 {
continue
}
arr := strings.SplitN(s, "=", 2)
if len(arr) != 2 {
return fmt.Errorf("malformed pair, expect string=bool")
}
k := strings.TrimSpace(arr[0])
v := strings.TrimSpace(arr[1])
boolValue, err := strconv.ParseBool(v)
if err != nil {
return fmt.Errorf("invalid value of %s: %s, err: %v", k, v, err)
}
(*m.Map)[k] = boolValue
}
return nil
}
// Type implements github.com/spf13/pflag.Value.
func (*MapStringBool) Type() string {
return "mapStringBool"
}
// Empty implements OmitEmpty.
func (m *MapStringBool) Empty() bool {
return len(*m.Map) == 0
}