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clap/examples/tutorial_builder/04_01_possible.md
Ed Page 9b23a09f7a fix(help): Don't rely on ALL CAPS for headers 
I see them fulfilling two roles
- A form of bolding
- As a callback to their placeholder in usage

However, it is a bit of an unpolished look and no other CLI seems to do
it.  This looks a bit more proefessional.  We have colored help for
formatting and I think the sections relation to usage will be clear
enough.
2022-08-26 10:21:18 -05:00

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$ 04_01_possible --help
clap [..]
A simple to use, efficient, and full-featured Command Line Argument Parser

Usage:
    04_01_possible[EXE] <MODE>

Arguments:
    <MODE>    What mode to run the program in [possible values: fast, slow]

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

$ 04_01_possible fast
Hare

$ 04_01_possible slow
Tortoise

$ 04_01_possible medium
? failed
error: "medium" isn't a valid value for '<MODE>'
	[possible values: fast, slow]

For more information try --help