urgeopts: standalone clap wrapper

urgeopts is a replacement for getopt based on clap.

urgeopts takes option descriptors as a YAML document from stdin, and parse arguments passed to it, and prints the result which can be eval'd. See example.sh for concrete usage.

Configurations look like

```yaml name: example bin_name: $0 version: "1.0" about: sample text author: Fumiaki Kinoshita fumiexcel@gmail.com

Flags take no arguments.

Number of occurences will be reported (e.g. verbose=1)

flags: verbose: help: verbose output short: v long: verbose

Options arguments are collected as newline-separated list of values.

opts: # usage syntax is also supported # cf. https://docs.rs/clap/2.33.0/clap/struct.Arg.html#syntax host: -h --host 'host name' mode: long: mode help: option with a certain set of possible values possible_values: [ herbivore, carnivore, omnivore ]

Positional arguments

args: - name: cmd help: command required: true - name: arg help: command arguments multiple: true subcommands: ls: #The name will be assigned to $subcommand about: Display a list of entities args: - name: name multiple: true ```

Usually, you want to embed configurations in a heredoc, pass all arguments to urgeopts and eval its output:

bash eval "$(urgeopts "$@" <<EOT ... EOT )"

Notes

I intentionally didn't use clap::App::from_yaml because the YAML representation tend to be redundant, and hard to diagnose panics.