File('x') should default to stdout not stdin

[tkossak]

Using click 6.7 + Python 3.6.0 :: Anaconda custom (64-bit)

If I create option with parameters type=click.File('w') default='-' Then the value defaults to sys.stdout. But when I create it with type=click.File('x') default='-' it defaults to sys.stdin. In my opinion it should default also to sys.stdout becase x file mode is also for writing (with exclusive file creation).

Run this script for proof:

#!/usr/bin/env python3
import sys
import click


@click.command()
@click.option('--file', '-f', type=click.File('x'), default='-')
def cli(file):
    print('stdin:', file == sys.stdin)
    print('stdout:', file == sys.stdout)

if __name__ == '__main__':
    cli()

Output is:

$ ./test.py
stdin: True
stdout: False