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bfa02fd418
This ports our example testing over to [trycmd](https://docs.rs/) so we can: - More thoroughly test our examples - Provide always-up-to-date example usage The old way of testing automatically picked up examples. This new way requires we have a `.md` file that uses the example in some way. Notes: - Moved overall example description to the `.md` file - I added cross-linking between related examples - `14_groups` had a redundant paragraph (twice talked about "one and only one"
803 B
803 B
Building on 11_only_specific_values, we will create an enum with 4 values, assign a positional argument that accepts only one of those values, and use clap to parse the argument.
$ 13_enum_values Foo
Found a Foo
$ 13_enum_values Bar
Found a Bar
Anything else will error, guiding the user to a valid value:
$ 13_enum_values Alice
? failed
error: "Alice" isn't a valid value for '<type>'
[possible values: Bar, Baz, Foo, Qux]
USAGE:
13_enum_values[EXE] <type>
For more information try --help
Valid values also get shown in the help:
$ 13_enum_values --help
myapp
USAGE:
13_enum_values[EXE] <type>
ARGS:
<type> The type to use [possible values: Foo, Bar, Baz, Qux]
OPTIONS:
-h, --help Print help information