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101 lines
2.6 KiB
Go
101 lines
2.6 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package pflag
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import (
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goflag "flag"
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"reflect"
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"strings"
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)
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// flagValueWrapper implements pflag.Value around a flag.Value. The main
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// difference here is the addition of the Type method that returns a string
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// name of the type. As this is generally unknown, we approximate that with
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// reflection.
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type flagValueWrapper struct {
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inner goflag.Value
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flagType string
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}
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// We are just copying the boolFlag interface out of goflag as that is what
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// they use to decide if a flag should get "true" when no arg is given.
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type goBoolFlag interface {
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goflag.Value
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IsBoolFlag() bool
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}
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func wrapFlagValue(v goflag.Value) Value {
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// If the flag.Value happens to also be a pflag.Value, just use it directly.
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if pv, ok := v.(Value); ok {
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return pv
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}
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pv := &flagValueWrapper{
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inner: v,
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}
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t := reflect.TypeOf(v)
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if t.Kind() == reflect.Interface || t.Kind() == reflect.Ptr {
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t = t.Elem()
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}
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pv.flagType = strings.TrimSuffix(t.Name(), "Value")
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return pv
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}
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func (v *flagValueWrapper) String() string {
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return v.inner.String()
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}
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func (v *flagValueWrapper) Set(s string) error {
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return v.inner.Set(s)
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}
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func (v *flagValueWrapper) Type() string {
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return v.flagType
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}
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// PFlagFromGoFlag will return a *pflag.Flag given a *flag.Flag
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// If the *flag.Flag.Name was a single character (ex: `v`) it will be accessiblei
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// with both `-v` and `--v` in flags. If the golang flag was more than a single
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// character (ex: `verbose`) it will only be accessible via `--verbose`
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func PFlagFromGoFlag(goflag *goflag.Flag) *Flag {
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// Remember the default value as a string; it won't change.
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flag := &Flag{
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Name: goflag.Name,
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Usage: goflag.Usage,
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Value: wrapFlagValue(goflag.Value),
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// Looks like golang flags don't set DefValue correctly :-(
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//DefValue: goflag.DefValue,
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DefValue: goflag.Value.String(),
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}
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// Ex: if the golang flag was -v, allow both -v and --v to work
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if len(flag.Name) == 1 {
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flag.Shorthand = flag.Name
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}
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if fv, ok := goflag.Value.(goBoolFlag); ok && fv.IsBoolFlag() {
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flag.NoOptDefVal = "true"
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}
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return flag
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}
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// AddGoFlag will add the given *flag.Flag to the pflag.FlagSet
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func (f *FlagSet) AddGoFlag(goflag *goflag.Flag) {
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if f.Lookup(goflag.Name) != nil {
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return
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}
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newflag := PFlagFromGoFlag(goflag)
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f.AddFlag(newflag)
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}
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// AddGoFlagSet will add the given *flag.FlagSet to the pflag.FlagSet
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func (f *FlagSet) AddGoFlagSet(newSet *goflag.FlagSet) {
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if newSet == nil {
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return
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}
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newSet.VisitAll(func(goflag *goflag.Flag) {
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f.AddGoFlag(goflag)
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})
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}
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