mirror of https://github.com/k3s-io/k3s
113 lines
3.1 KiB
Go
113 lines
3.1 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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"strings"
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)
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// MapStringString can be set from the command line with the format `--flag "string=string"`.
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// Multiple flag invocations are supported. For example: `--flag "a=foo" --flag "b=bar"`. If this is desired
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// to be the only type invocation `NoSplit` should be set to true.
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// Multiple comma-separated key-value pairs in a single invocation are supported if `NoSplit`
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// is set to false. For example: `--flag "a=foo,b=bar"`.
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type MapStringString struct {
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Map *map[string]string
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initialized bool
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NoSplit bool
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}
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// NewMapStringString takes a pointer to a map[string]string and returns the
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// MapStringString flag parsing shim for that map
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func NewMapStringString(m *map[string]string) *MapStringString {
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return &MapStringString{Map: m}
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}
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// NewMapStringString takes a pointer to a map[string]string and sets `NoSplit`
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// value to `true` and returns the MapStringString flag parsing shim for that map
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func NewMapStringStringNoSplit(m *map[string]string) *MapStringString {
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return &MapStringString{
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Map: m,
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NoSplit: true,
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}
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}
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// String implements github.com/spf13/pflag.Value
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func (m *MapStringString) 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=%s", 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 *MapStringString) 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]string)")
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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]string)
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m.initialized = true
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}
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// account for comma-separated key-value pairs in a single invocation
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if !m.NoSplit {
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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=string")
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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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(*m.Map)[k] = v
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}
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return nil
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}
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// account for only one key-value pair in a single invocation
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arr := strings.SplitN(value, "=", 2)
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if len(arr) != 2 {
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return fmt.Errorf("malformed pair, expect string=string")
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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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(*m.Map)[k] = v
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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 (*MapStringString) Type() string {
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return "mapStringString"
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}
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// Empty implements OmitEmpty
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func (m *MapStringString) Empty() bool {
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return len(*m.Map) == 0
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}
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