start writing letter head with kundennummer, rechnungsnummer and rechnungsdatum

src/main.py

@@ -67,17 +67,16 @@ def main():
         invoice = parse_yaml_file(invoice_file)
         envelope = parse_yaml_file(envelope_file)
 
-        print('Invoice data:')
-        print(invoice)
-
-        print(envelope)
-
         print('Envelope data:')
         envelope_data = DataObject(**envelope)
         print(envelope_data.__dict__)
 
         print('Invoice data:')
         invoice_data = DataObject(**invoice)
+        if not hasattr(invoice_data, 'Id'):
+            invoice_data.Id = None
+
+        invoice_data.Id = invoice_data.Id or invoice_file.stem
         print(invoice_data.__dict__)
 
     except FileNotFoundError as e:
@@ -94,7 +93,10 @@ def main():
     template = generator.prepare_template(invoice_data, envelope_data)
 
     try:
-        html_generator.HtmlTemplate.convert_html_to_pdf(template, 'invoice.pdf')
+        print('Generating invoice...')
+        invoice_pdf = Path(invoice_data.Id).with_suffix('.pdf')
+        print(f'Invoice PDF: {invoice_pdf}')
+        html_generator.HtmlTemplate.convert_html_to_pdf(template, invoice_pdf)
     except Exception as e:
         print(f'Error: {e}')
         return