chore: refactor selection by name

cmd/flags.go

@@ -1,5 +1,11 @@
 package cmd
 
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
 const (
 	flagHeaders            = "log-headers"
 	flagHeadersDescription = "Log headers"
@@ -22,3 +28,21 @@ const (
 	flagStop            = "stop"
 	flagStopDescription = "Stop charging"
 )
+
+func selectByName(cmd *cobra.Command, conf *[]qualifiedConfig) error {
+	flag := cmd.PersistentFlags().Lookup(flagName)
+	if !flag.Changed {
+		return nil
+	}
+
+	name := flag.Value.String()
+
+	for _, cfg := range *conf {
+		if cfg.Name == name {
+			*conf = []qualifiedConfig{cfg}
+			return nil
+		}
+	}
+
+	return fmt.Errorf("%s not found", name)
+}