service auth, edit and delete now all support --service flag

If a service name is given, this will be used. If not the user is
prompted to select one.

internal/backends/backends.go

@@ -63,12 +63,8 @@ func (l BackendList) Swap(i, j int) {
 
 type Capability = string
 
-func ResolveBackend[T interface{}](config *config.ServiceConfig) (T, error) {
+func ResolveBackend[T interface{}](config config.ServiceConfig) (T, error) {
 	var result T
-	if config == nil {
-		err := fmt.Errorf("config must not be nil")
-		return result, err
-	}
 	backend, err := backendWithConfig(config)
 	if err != nil {
 		return result, err
@@ -120,12 +116,12 @@ var knownBackends = map[string]func() models.Backend{
 	"subsonic":      func() models.Backend { return &subsonic.SubsonicApiBackend{} },
 }
 
-func backendWithConfig(config *config.ServiceConfig) (models.Backend, error) {
+func backendWithConfig(config config.ServiceConfig) (models.Backend, error) {
 	backend, err := BackendByName(config.Backend)
 	if err != nil {
 		return nil, err
 	}
-	return backend.FromConfig(config), nil
+	return backend.FromConfig(&config), nil
 }
 
 func ImplementsInterface[T interface{}](backend *models.Backend) (bool, string) {

internal/backends/backends_test.go

@@ -42,7 +42,7 @@ func TestResolveBackend(t *testing.T) {
 	c := viper.New()
 	c.Set("backend", "dump")
 	service := config.NewServiceConfig("test", c)
-	backend, err := backends.ResolveBackend[models.ListensImport](&service)
+	backend, err := backends.ResolveBackend[models.ListensImport](service)
 	assert.NoError(t, err)
 	assert.IsType(t, &dump.DumpBackend{}, backend)
 }
@@ -51,7 +51,7 @@ func TestResolveBackendUnknown(t *testing.T) {
 	c := viper.New()
 	c.Set("backend", "foo")
 	service := config.NewServiceConfig("test", c)
-	_, err := backends.ResolveBackend[models.ListensImport](&service)
+	_, err := backends.ResolveBackend[models.ListensImport](service)
 	assert.EqualError(t, err, "unknown backend \"foo\"")
 }
 
@@ -59,7 +59,7 @@ func TestResolveBackendInvalidInterface(t *testing.T) {
 	c := viper.New()
 	c.Set("backend", "dump")
 	service := config.NewServiceConfig("test", c)
-	_, err := backends.ResolveBackend[models.ListensExport](&service)
+	_, err := backends.ResolveBackend[models.ListensExport](service)
 	assert.EqualError(t, err, "backend dump does not implement ListensExport")
 }
 

internal/cli/common.go

@@ -20,11 +20,9 @@ import (
 	"go.uploadedlobster.com/scotty/internal/config"
 )
 
-func GetServiceConfigFromFlag(cmd *cobra.Command, flagName string) *config.ServiceConfig {
+func GetServiceConfigFromFlag(cmd *cobra.Command, flagName string) (config.ServiceConfig, error) {
 	name := cmd.Flag(flagName).Value.String()
-	config, err := config.GetService(name)
-	cobra.CheckErr(err)
-	return config
+	return config.GetService(name)
 }
 
 func getInt64FromFlag(cmd *cobra.Command, flagName string) (result int64) {

internal/cli/services.go

@@ -21,12 +21,20 @@ import (
 	"slices"
 
 	"github.com/manifoldco/promptui"
+	"github.com/spf13/cobra"
 	"go.uploadedlobster.com/scotty/internal/backends"
 	"go.uploadedlobster.com/scotty/internal/config"
 	"go.uploadedlobster.com/scotty/internal/i18n"
 )
 
-func SelectService() (config.ServiceConfig, error) {
+func SelectService(cmd *cobra.Command) (config.ServiceConfig, error) {
+	// First try to load service from command line flag
+	service, err := GetServiceConfigFromFlag(cmd, "service")
+	if err == nil {
+		return service, nil
+	}
+
+	// Prompt the user to select a service
 	services := config.AllServicesAsList()
 	if len(services) == 0 {
 		err := errors.New(i18n.Tr("no existing service configurations"))

internal/config/services.go

@@ -116,13 +116,13 @@ func AllServicesAsList() ServiceList {
 	return list
 }
 
-func GetService(name string) (*ServiceConfig, error) {
+func GetService(name string) (ServiceConfig, error) {
 	key := "service." + name
 	config := viper.Sub(key)
 	if config != nil {
 		service := NewServiceConfig(name, config)
-		return &service, nil
+		return service, nil
 	}
 
-	return nil, fmt.Errorf(i18n.Tr("no service configuration \"%v\"", name))
+	return ServiceConfig{}, fmt.Errorf(i18n.Tr("no service configuration \"%v\"", name))
 }