feat: engine -> process, engine is now a factory for a proces

internal/registry/registry.go

@@ -27,6 +27,11 @@ func (r *Registry) AddConversions(conversions ...cli.Conversion) error {
 
 	return nil
 }
+func (r *Registry) MustAddConversions(conversions ...cli.Conversion) {
+	if err := r.AddConversions(conversions...); err != nil {
+		panic(err)
+	}
+}
 
 func (r *Registry) AddMarshaler(c cli.Marshaler) error {
 	if _, ok := r.marshalers[c.InType()]; ok {
@@ -37,6 +42,12 @@ func (r *Registry) AddMarshaler(c cli.Marshaler) error {
 	return nil
 }
 
+func (r *Registry) MustAddMarshaler(c cli.Marshaler) {
+	if err := r.AddMarshaler(c); err != nil {
+		panic(err)
+	}
+}
+
 func (r *Registry) AddEngine(e cli.Engine) error {
 	if _, ok := r.engines[e.Name()]; ok {
 		return fmt.Errorf("engine '%s' already registered", e.Name())
@@ -46,6 +57,12 @@ func (r *Registry) AddEngine(e cli.Engine) error {
 	return nil
 }
 
+func (r *Registry) MustAddEngine(e cli.Engine) {
+	if err := r.AddEngine(e); err != nil {
+		panic(err)
+	}
+}
+
 func (r *Registry) GetEngine(name string) (cli.Engine, error) {
 	e, ok := r.engines[name]
 	if !ok {