Hermes context specific help option

[leejw51crypto]

Crate

Summary

add context specific help

 hermes  start --help

currently it shows

error: unrecognized option `--help`

instead , we can display help for "start" command

Problem Definition

Proposal

Acceptance Criteria

---

For Admin Use

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[adizere]

The Hermes help menu is currently implemented as a global option. This means that the help argument must come before any specific command. So to obtain the help for command start, we would write hermes help start.

$ hermes help start
hermes 0.3.2
Informal Systems <hello@informal.systems>
Hermes is an IBC Relayer written in Rust.

USAGE:
    hermes start <OPTIONS>

DESCRIPTION:
    Start the relayer in multi-chain mode. Handles packet relaying across all open channels between all chains in the config.

The same goes for any other command, including sub-commands, e.g., hermes help create or hermes help create client.
Would this solve your issue?

Related open: #134

[leejw51crypto]

global option works, but when user enters command like this

hermes create client
error: missing required free argument

hermes 0.3.2
Informal Systems <hello@informal.systems>
Hermes is an IBC Relayer written in Rust.

FLAGS:
    -c, --config CONFIG       path to configuration file
    -h, --help                print help message
    -j, --json                enable JSON output

--help options looks like

hermes create client --help 

user just add --help to get help messages, it would be handy

[romac]

Yes, that's an unfortunate limitation of the gumdrop crate that we depend on via abscissa, the CLI framework used to build Hermes. When Abscissa eventually moves to Clap, we'll get a much better command-line UX.

[romac]

I guess in the meantime we could look into manually adding a --help to all commands and invoke the global Help command with the appropriate arguments.

[leejw51crypto]

yes, that would work

[adizere]

Yes, that's an unfortunate limitation of the gumdrop crate that we depend on via abscissa, the CLI framework used to build Hermes. When Abscissa eventually moves to Clap, we'll get a much better command-line UX.

I did a quick experiment (#1012) with an alternative fix of modifying the help message, so that Hermes explicitly mentions the help command (instead of mentioning the -h flag, which does not work).

@leejw51crypto @romac could you please have a look over #1012 ?