Display warning in `docker compose down` if nothing to remove (no container, no network)

For reference, `docker-compose` displays `WARNING: Network sentences_default not found`

Signed-off-by: Guillaume Tardif <guillaume.tardif@gmail.com>

local/compose/down.go

@@ -34,6 +34,7 @@ import (
 
 func (s *composeService) Down(ctx context.Context, projectName string, options compose.DownOptions) error {
 	w := progress.ContextWriter(ctx)
+	resourceToRemove := false
 
 	if options.Project == nil {
 		project, err := s.projectFromContainerLabels(ctx, projectName)
@@ -51,6 +52,9 @@ func (s *composeService) Down(ctx context.Context, projectName string, options c
 	if err != nil {
 		return err
 	}
+	if len(containers) > 0 {
+		resourceToRemove = true
+	}
 
 	err = InReverseDependencyOrder(ctx, options.Project, func(c context.Context, service types.ServiceConfig) error {
 		serviceContainers, others := containers.split(isService(service.Name))
@@ -80,12 +84,16 @@ func (s *composeService) Down(ctx context.Context, projectName string, options c
 
 	eg, _ := errgroup.WithContext(ctx)
 	for _, n := range networks {
+		resourceToRemove = true
 		networkID := n.ID
 		networkName := n.Name
 		eg.Go(func() error {
 			return s.ensureNetworkDown(ctx, networkID, networkName)
 		})
 	}
+	if !resourceToRemove {
+		w.Event(progress.NewEvent(projectName, progress.Done, "Warning: No resource found to remove"))
+	}
 	return eg.Wait()
 }