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// SPDX-FileCopyrightText: 2020 Ethel Morgan
//
// SPDX-License-Identifier: MIT
package flag
import (
"errors"
"fmt"
"strconv"
"strings"
)
var (
// ErrRequired provides a canonical "you must set this flag" error message.
ErrRequired = errors.New("must not be empty")
)
func RequiredString(raw string) (interface{}, error) {
if raw == "" {
return nil, ErrRequired
}
return raw, nil
}
func StringEnum(values ...string) ParseFunc {
return func(raw string) (interface{}, error) {
for _, value := range values {
if value == raw {
return raw, nil
}
}
return raw, fmt.Errorf("must be one of %q", values)
}
}
func IntList(raw string) (interface{}, error) {
var ints []int
if raw == "" {
return ints, nil
}
for _, raw := range strings.Split(raw, ",") {
i, err := strconv.Atoi(raw)
if err != nil {
return ints, err
}
ints = append(ints, i)
}
return ints, nil
}
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