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https://github.com/clap-rs/clap
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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"
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Using Arg::default_value, rather than Option::unwrap_or, gives clap more information it can use with our argument.
For example, let's look at the help:
$ 10_default_values --help
myapp
does awesome things
USAGE:
10_default_values[EXE] [OPTIONS] [INPUT]
ARGS:
<INPUT> The input file to use [default: input.txt]
OPTIONS:
-c <CONFIG> The config file to use
-h, --help Print help information
<INPUT>'s description says what the default is while -c's does not.
Otherwise, they'll work the same:
$ 10_default_values
The input file is: input.txt
The config file is: config.json
$ 10_default_values other.txt -c other.toml
The input file is: other.txt
The config file is: other.toml