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clap/examples/tutorial_builder/04_01_possible.md
Ed Page 762b06fba4 fix(error): Try to polish/clarify messages 
In text communication you need to balance
- Scannability, putting the most important information upfront
- Brevity so people don't get lost in the message
- Softness to help ease people through a frustrating experience

I feel we weren't doing great on the first two points, so tried to
iterate on the messages to improve them.  I hope we aren't suffering too
much on the third point as a side effect.
2023-01-06 17:01:36 -06:00

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$ 04_01_possible --help
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
  -V, --version  Print version

$ 04_01_possible fast
Hare

$ 04_01_possible slow
Tortoise

$ 04_01_possible medium
? failed
error: invalid value 'medium' for '<MODE>'
  [possible values: fast, slow]

For more information, try '--help'.