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StringMap wraps a `map[string]string` and parses inputs in the form of "key=value".
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| package cli | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "fmt" | ||
| "reflect" | ||
| "sort" | ||
| "strings" | ||
| ) | ||
|
|
||
| // MapBase wraps map[string]T to satisfy flag.Value | ||
| type MapBase[T any, C any, VC ValueCreator[T, C]] struct { | ||
| dict *map[string]T | ||
| hasBeenSet bool | ||
| value Value | ||
| } | ||
|
|
||
| func (i MapBase[T, C, VC]) Create(val map[string]T, p *map[string]T, c C) Value { | ||
| *p = map[string]T{} | ||
| for k, v := range val { | ||
| (*p)[k] = v | ||
| } | ||
| var t T | ||
| np := new(T) | ||
| var vc VC | ||
| return &MapBase[T, C, VC]{ | ||
| dict: p, | ||
| value: vc.Create(t, np, c), | ||
| } | ||
| } | ||
|
|
||
| // NewMapBase makes a *MapBase with default values | ||
| func NewMapBase[T any, C any, VC ValueCreator[T, C]](defaults map[string]T) *MapBase[T, C, VC] { | ||
| return &MapBase[T, C, VC]{ | ||
| dict: &defaults, | ||
| } | ||
| } | ||
|
|
||
| // Set parses the value and appends it to the list of values | ||
| func (i *MapBase[T, C, VC]) Set(value string) error { | ||
| if !i.hasBeenSet { | ||
| *i.dict = map[string]T{} | ||
| i.hasBeenSet = true | ||
| } | ||
|
|
||
| if strings.HasPrefix(value, slPfx) { | ||
| // Deserializing assumes overwrite | ||
| _ = json.Unmarshal([]byte(strings.Replace(value, slPfx, "", 1)), &i.dict) | ||
| i.hasBeenSet = true | ||
| return nil | ||
| } | ||
|
|
||
| for _, item := range flagSplitMultiValues(value) { | ||
| key, value, ok := strings.Cut(item, defaultMapFlagKeyValueSeparator) | ||
| if !ok { | ||
| return fmt.Errorf("item %q is missing separator %q", item, defaultMapFlagKeyValueSeparator) | ||
| } | ||
| if err := i.value.Set(strings.TrimSpace(value)); err != nil { | ||
| return err | ||
| } | ||
| tmp, ok := i.value.Get().(T) | ||
| if !ok { | ||
| return fmt.Errorf("unable to cast %v", i.value) | ||
| } | ||
| (*i.dict)[key] = tmp | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| // String returns a readable representation of this value (for usage defaults) | ||
| func (i *MapBase[T, C, VC]) String() string { | ||
| v := i.Value() | ||
| var t T | ||
| if reflect.TypeOf(t).Kind() == reflect.String { | ||
| return fmt.Sprintf("%v", v) | ||
| } | ||
| return fmt.Sprintf("%T{%s}", v, i.ToString(v)) | ||
| } | ||
|
|
||
| // Serialize allows MapBase to fulfill Serializer | ||
| func (i *MapBase[T, C, VC]) Serialize() string { | ||
| jsonBytes, _ := json.Marshal(i.dict) | ||
| return fmt.Sprintf("%s%s", slPfx, string(jsonBytes)) | ||
| } | ||
|
|
||
| // Value returns the mapping of values set by this flag | ||
| func (i *MapBase[T, C, VC]) Value() map[string]T { | ||
| if i.dict == nil { | ||
| return map[string]T{} | ||
| } | ||
| return *i.dict | ||
| } | ||
|
|
||
| // Get returns the mapping of values set by this flag | ||
| func (i *MapBase[T, C, VC]) Get() interface{} { | ||
| return *i.dict | ||
| } | ||
|
|
||
| func (i MapBase[T, C, VC]) ToString(t map[string]T) string { | ||
| var defaultVals []string | ||
| var vc VC | ||
| for _, k := range sortedKeys(t) { | ||
| defaultVals = append(defaultVals, k+defaultMapFlagKeyValueSeparator+vc.ToString(t[k])) | ||
| } | ||
| return strings.Join(defaultVals, ", ") | ||
| } | ||
|
|
||
| func sortedKeys[T any](dict map[string]T) []string { | ||
| keys := make([]string, 0, len(dict)) | ||
| for k := range dict { | ||
| keys = append(keys, k) | ||
| } | ||
| sort.Strings(keys) | ||
| return keys | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| package cli | ||
|
|
||
| import "flag" | ||
|
|
||
| type StringMap = MapBase[string, NoConfig, stringValue] | ||
| type StringMapFlag = FlagBase[map[string]string, NoConfig, StringMap] | ||
|
|
||
| var NewStringMap = NewMapBase[string, NoConfig, stringValue] | ||
|
|
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| // StringMap looks up the value of a local StringMapFlag, returns | ||
| // nil if not found | ||
| func (cCtx *Context) StringMap(name string) map[string]string { | ||
| if fs := cCtx.lookupFlagSet(name); fs != nil { | ||
| return lookupStringMap(name, fs) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func lookupStringMap(name string, set *flag.FlagSet) map[string]string { | ||
| f := set.Lookup(name) | ||
| if f != nil { | ||
| if mapping, ok := f.Value.(*StringMap); ok { | ||
| return mapping.Value() | ||
| } | ||
| } | ||
| return nil | ||
| } |
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