-
Notifications
You must be signed in to change notification settings - Fork 64
/
flags_enum.go
56 lines (47 loc) · 1.16 KB
/
flags_enum.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) 2022, Unikraft GmbH and The KraftKit Authors.
// Licensed under the BSD-3-Clause License (the "License").
// You may not use this file expect in compliance with the License.
package cmdfactory
import (
"fmt"
"strings"
)
type EnumFlag[T fmt.Stringer] struct {
Allowed []T
Value T
}
// NewEnumFlag give a list of allowed flag parameters, where the second argument
// is the default
func NewEnumFlag[T fmt.Stringer](allowed []T, d T) *EnumFlag[T] {
return &EnumFlag[T]{
Allowed: allowed,
Value: d,
}
}
func (a *EnumFlag[T]) String() string {
return a.Value.String()
}
func (a *EnumFlag[T]) Set(p string) error {
isIncluded := func(opts []T, val string) (bool, *T) {
for _, opt := range opts {
if val == opt.String() {
return true, &opt
}
}
return false, nil
}
ok, t := isIncluded(a.Allowed, p)
if !ok {
allowed := make([]string, len(a.Allowed))
for i := range a.Allowed {
allowed[i] = a.Allowed[i].String()
}
return fmt.Errorf("%s is not included in: %s", p, strings.Join(allowed, ", "))
}
a.Value = *t
return nil
}
func (a *EnumFlag[T]) Type() string {
return "string"
}