chore: refactor selection by name

cmd/charger.go

@@ -54,13 +54,8 @@ func runCharger(cmd *cobra.Command, args []string) {
 	}
 
 	// select single charger
-	if name := cmd.PersistentFlags().Lookup(flagName).Value.String(); name != "" {
-		for _, cfg := range conf.Chargers {
-			if cfg.Name == name {
-				conf.Chargers = []qualifiedConfig{cfg}
-				break
-			}
-		}
+	if err := selectByName(cmd, &conf.Chargers); err != nil {
+		log.FATAL.Fatal(err)
 	}
 
 	if err := cp.configureChargers(conf); err != nil {

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)
+}

cmd/meter.go

@@ -45,13 +45,8 @@ func runMeter(cmd *cobra.Command, args []string) {
 	}
 
 	// select single meter
-	if name := cmd.PersistentFlags().Lookup("name").Value.String(); name != "" {
-		for _, cfg := range conf.Meters {
-			if cfg.Name == name {
-				conf.Meters = []qualifiedConfig{cfg}
-				break
-			}
-		}
+	if err := selectByName(cmd, &conf.Meters); err != nil {
+		log.FATAL.Fatal(err)
 	}
 
 	if err := cp.configureMeters(conf); err != nil {

cmd/vehicle.go

@@ -47,14 +47,9 @@ func runVehicle(cmd *cobra.Command, args []string) {
 		request.LogHeaders = true
 	}
 
-	// select single charger
-	if name := cmd.PersistentFlags().Lookup(flagName).Value.String(); name != "" {
-		for _, cfg := range conf.Vehicles {
-			if cfg.Name == name {
-				conf.Vehicles = []qualifiedConfig{cfg}
-				break
-			}
-		}
+	// select single vehicle
+	if err := selectByName(cmd, &conf.Vehicles); err != nil {
+		log.FATAL.Fatal(err)
 	}
 
 	if err := cp.configureVehicles(conf); err != nil {