mirror of https://github.com/k3s-io/k3s
91 lines
2.5 KiB
Go
91 lines
2.5 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package flag
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import (
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"fmt"
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"sort"
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"strconv"
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"strings"
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)
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// MapStringBool can be set from the command line with the format `--flag "string=bool"`.
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// Multiple comma-separated key-value pairs in a single invocation are supported. For example: `--flag "a=true,b=false"`.
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// Multiple flag invocations are supported. For example: `--flag "a=true" --flag "b=false"`.
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type MapStringBool struct {
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Map *map[string]bool
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initialized bool
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}
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// NewMapStringBool takes a pointer to a map[string]string and returns the
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// MapStringBool flag parsing shim for that map
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func NewMapStringBool(m *map[string]bool) *MapStringBool {
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return &MapStringBool{Map: m}
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}
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// String implements github.com/spf13/pflag.Value
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func (m *MapStringBool) String() string {
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if m == nil || m.Map == nil {
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return ""
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}
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pairs := []string{}
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for k, v := range *m.Map {
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pairs = append(pairs, fmt.Sprintf("%s=%t", k, v))
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}
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sort.Strings(pairs)
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return strings.Join(pairs, ",")
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}
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// Set implements github.com/spf13/pflag.Value
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func (m *MapStringBool) Set(value string) error {
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if m.Map == nil {
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return fmt.Errorf("no target (nil pointer to map[string]bool)")
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}
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if !m.initialized || *m.Map == nil {
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// clear default values, or allocate if no existing map
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*m.Map = make(map[string]bool)
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m.initialized = true
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}
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for _, s := range strings.Split(value, ",") {
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if len(s) == 0 {
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continue
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}
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arr := strings.SplitN(s, "=", 2)
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if len(arr) != 2 {
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return fmt.Errorf("malformed pair, expect string=bool")
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}
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k := strings.TrimSpace(arr[0])
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v := strings.TrimSpace(arr[1])
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boolValue, err := strconv.ParseBool(v)
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if err != nil {
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return fmt.Errorf("invalid value of %s: %s, err: %v", k, v, err)
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}
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(*m.Map)[k] = boolValue
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}
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return nil
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}
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// Type implements github.com/spf13/pflag.Value
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func (*MapStringBool) Type() string {
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return "mapStringBool"
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}
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// Empty implements OmitEmpty
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func (m *MapStringBool) Empty() bool {
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return len(*m.Map) == 0
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}
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