fix lp on nix

print/app.py

@@ -68,7 +68,12 @@ def upload_and_print():
                 app.logger.info(
                     f"Sending '{filename}' ({page_count} pages) to printer '{PRINTER_NAME}'"
                 )
-                command = ["lp", "-d", PRINTER_NAME, filepath]
+                command = [
+                    "lp",
+                    "-d",
+                    PRINTER_NAME,
+                    filepath,
+                ]
                 result = subprocess.run(
                     command, capture_output=True, text=True, check=True
                 )

print/templates/index.html

@@ -38,7 +38,7 @@
                 {% endif %}
             {% endwith %}
 
-            <form action="/" method="post" enctype="multipart/form-data">
+            <form action="{{ url_for('upload_and_print') }}" method="post" enctype="multipart/form-data">
                 <div class="border-2 border-dashed border-gray-300 rounded-lg p-8 text-center bg-gray-50 hover:border-blue-500 transition-colors duration-300">
                     <label for="file-upload" class="cursor-pointer">
                         <svg xmlns="http://www.w3.org/2000/svg" class="w-12 h-12 mx-auto text-gray-400" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="1">