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Optional option argument #490

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tdegeus opened this issue Feb 19, 2021 · 0 comments

tdegeus commented Feb 19, 2021

It work be great to support an optional option argument:

myprog
    Lorem ipsum.

Usage:
    myprog [options]

Options:
    -i, --input=[N]    Input file. (default: myname.txt)
    -h, --help         Show help.
          --version    Show version.

where the use case is

myprog -> no input file.
myprog -i -> an input file but with a default file-name (e.g. myname.txt, N.B. notice the braces and not square brackets).
myprog -i somename.txt -> an input file with a custom name

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