gtsocial-umbx

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integrate.go (787B)

      1 // Copyright 2013-2022 Frank Schroeder. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 package properties
      6 
      7 import "flag"
      8 
      9 // MustFlag sets flags that are skipped by dst.Parse when p contains
     10 // the respective key for flag.Flag.Name.
     11 //
     12 // It's use is recommended with command line arguments as in:
     13 //
     14 //	flag.Parse()
     15 //	p.MustFlag(flag.CommandLine)
     16 func (p *Properties) MustFlag(dst *flag.FlagSet) {
     17 	m := make(map[string]*flag.Flag)
     18 	dst.VisitAll(func(f *flag.Flag) {
     19 		m[f.Name] = f
     20 	})
     21 	dst.Visit(func(f *flag.Flag) {
     22 		delete(m, f.Name) // overridden
     23 	})
     24 
     25 	for name, f := range m {
     26 		v, ok := p.Get(name)
     27 		if !ok {
     28 			continue
     29 		}
     30 
     31 		if err := f.Value.Set(v); err != nil {
     32 			ErrorHandler(err)
     33 		}
     34 	}
     35 }