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package enumflag_test
import (
"fmt"
"github.com/spf13/cobra"
"github.com/thediveo/enumflag/v2"
)
// ① Define your new enum flag type. It can be derived from enumflag.Flag,
// but it doesn't need to be as long as it satisfies comparable.
type BarMode enumflag.Flag
// ② Define the enumeration values for BarMode.
const (
NoDefault = iota // optional definition for "no default" zero value
Barr BarMode = iota
Barz
)
// ③ Map enumeration values to their textual representations (value
// identifiers).
var BarModeIds = map[BarMode][]string{
// ...do NOT include/map the "no default" zero value!
Barr: {"barr"},
Barz: {"barz"},
}
func Example_no_default_value() {
// ④ Define your enum flag value.
var barmode BarMode
rootCmd := &cobra.Command{
Run: func(cmd *cobra.Command, _ []string) {
fmt.Printf("mode is: %d=%q\n",
barmode,
cmd.PersistentFlags().Lookup("mode").Value.String())
},
}
// ⑤ Define the CLI flag parameters for your wrapped enum flag.
rootCmd.PersistentFlags().VarP(
enumflag.NewWithoutDefault(&barmode, "mode", BarModeIds, enumflag.EnumCaseInsensitive),
"mode", "m",
"bars the output; can be 'barr' or 'barz'")
// now cobra's help won't render the default enum value identifier anymore...
_ = rootCmd.Help()
_ = rootCmd.Execute()
// Output:
// Usage:
// [flags]
//
// Flags:
// -m, --mode mode bars the output; can be 'barr' or 'barz'
// mode is: 0=""
}
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