Add Zugferd Opt

goblhtml.go

@@ -92,6 +92,13 @@ func WithEmbeddedStylesheets() Option {
 	}
 }
 
+// WithZugferd adds the Zugferd XMP metadata to the HTML document.
+func WithZugferd() Option {
+	return func(o *internal.Opts) {
+		o.Zugferd = true
+	}
+}
+
 // Render takes the GOBL envelope and attempts to render an HTML document
 // from it.
 func Render(ctx context.Context, env *gobl.Envelope, opts ...Option) ([]byte, error) {

internal/options.go

@@ -36,6 +36,8 @@ type Opts struct {
 	// are contained inside the HTML output. This is useful for PDF
 	// output or to avoid additional requests.
 	EmbedStylesheets bool
+	// Zugferd when true, adds the Zugferd XMP metadata to the PDF.
+	Zugferd bool
 }
 
 // WithOptions prepares the context with the options to use.