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// Copyright 2017 Frank Schroeder. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package properties
import "flag"
// MustFlag sets flags that are skipped by dst.Parse when p contains
// the respective key for flag.Flag.Name.
//
// It's use is recommended with command line arguments as in:
// flag.Parse()
// p.MustFlag(flag.CommandLine)
func (p *Properties) MustFlag(dst *flag.FlagSet) {
m := make(map[string]*flag.Flag)
dst.VisitAll(func(f *flag.Flag) {
m[f.Name] = f
})
dst.Visit(func(f *flag.Flag) {
delete(m, f.Name) // overridden
})
for name, f := range m {
v, ok := p.Get(name)
if !ok {
continue
}
if err := f.Value.Set(v); err != nil {
ErrorHandler(err)
}
}
}
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