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clap/examples/tutorial_derive/04_02_parse.md
Ed Page 9a645d2d19 fix(help): Collapse usage to one line 
After looking at more examples, I've become more attached to this
briefer format.

Part of #4132
2022-09-07 11:03:57 -05:00

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$ 04_02_parse_derive --help
A simple to use, efficient, and full-featured Command Line Argument Parser

Usage: 04_02_parse_derive[EXE] <PORT>

Arguments:
    <PORT>    Network port to use

Options:
    -h, --help       Print help information
    -V, --version    Print version information

$ 04_02_parse_derive 22
PORT = 22

$ 04_02_parse_derive foobar
? failed
error: Invalid value "foobar" for '<PORT>': invalid digit found in string

For more information try --help

$ 04_02_parse_derive 0
? failed
error: Invalid value "0" for '<PORT>': 0 is not in 1..=65535

For more information try --help