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package enumflag_test
import (
"fmt"
"log/slog"
"github.com/spf13/cobra"
"github.com/thediveo/enumflag/v2"
)
func Example_external() {
// ①+② skip "define your own enum flag type" and enumeration values, as we
// already have a 3rd party one.
// ③ Map 3rd party enumeration values to their textual representations
var LoglevelIds = map[slog.Level][]string{
slog.LevelDebug: {"debug"},
slog.LevelInfo: {"info"},
slog.LevelWarn: {"warning", "warn"},
slog.LevelError: {"error"},
}
// ④ Define your enum flag value and set the your logging default value.
var loglevel = slog.LevelWarn
rootCmd := &cobra.Command{
Run: func(cmd *cobra.Command, _ []string) {
fmt.Printf("logging level is: %d=%q\n",
loglevel,
cmd.PersistentFlags().Lookup("log").Value.String())
},
}
// ⑤ Define the CLI flag parameters for your wrapped enum flag.
rootCmd.PersistentFlags().Var(
enumflag.New(&loglevel, "log", LoglevelIds, enumflag.EnumCaseInsensitive),
"log",
"sets logging level; can be 'trace', 'debug', 'info', 'warn', 'error', 'fatal', 'panic'")
_ = rootCmd.Execute()
rootCmd.SetArgs([]string{"--log", "debug"})
_ = rootCmd.Execute()
// Output:
// logging level is: 4="warning"
// logging level is: -4="debug"
}
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