Platform

• SeqAn version: master from around December
• Operating system: RHEL 7
• Compiler: gcc10.2

Description

How to repeat the problem

parser.add_positional_option(p1, "FOO", seqan3::input_file_validator{{"foo.bar"}});

This code is accepted and nothing in the documentation suggests that this doesn't work. But when I pass a file called X.foo.bar to the program, the argument parser throws and says

... the following valid extensions: [foo.bar]. Got ".bar" instead!"

I know that we have special treatment for files now (which is nice but might be better served by a different validator), but having an extension with a dot is quite common, even independent of compression.

Expected behaviour

This should work.

Actual behaviour

It doesn't.

Possible fix

This should be quite simple. Just check if the path ends_with the respective string instead of calling .extension().