refactor: push commands in to cmd and ev to root as library

cmd/ev/app.msgbus.go

@@ -0,0 +1,32 @@
+package main
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/sour-is/ev"
+	"github.com/sour-is/ev/app/msgbus"
+	"github.com/sour-is/ev/internal/lg"
+	"github.com/sour-is/ev/pkg/service"
+	"github.com/sour-is/ev/pkg/slice"
+)
+
+var _ = apps.Register(50, func(ctx context.Context, svc *service.Harness) error {
+	ctx, span := lg.Span(ctx)
+	defer span.End()
+
+	span.AddEvent("Enable Msgbus")
+	eventstore, ok := slice.Find[*ev.EventStore](svc.Services...)
+	if !ok {
+		return fmt.Errorf("*es.EventStore not found in services")
+	}
+
+	msgbus, err := msgbus.New(ctx, eventstore)
+	if err != nil {
+		span.RecordError(err)
+		return err
+	}
+	svc.Add(msgbus)
+
+	return nil
+})