Function inout

tests/test_arguments.py:109–114

(input, output)

    @click.argument("input", type=click.File("rb"))
    @click.argument("output", type=click.File("wb"))
    def inout(input, output):
        while True:
            chunk = input.read(1024)
            if not chunk:
                break
            output.write(chunk)

    with runner.isolated_filesystem():
        result = runner.invoke(inout, ["-", "hello.txt"], input="Hey!")