Add basic CLI commands

[xoxys]

It could be handy to have some basic CLI options for the bitwarden_rs binary in place. Minimum set could be something like bitwarden_rs --help and bitwarden_rs --version.

These CLI options can also be used to verify if the compiled binary is executable.

[tinywombat765]

I'd like to take this

[dani-garcia]

Sure thing, have at it! If you need help I'm usually either here or the Matrix chat.

[tinywombat765]

@dani-garcia Do you have a preference as for as cli argument parsing is concerned?

[dani-garcia]

Do you mean choice of library? If nothing has changed, clap is the most popular so I'd go that way.

https://github.com/clap-rs/clap

[tinywombat765]

In that case I'd like to use structopt, which is built on top of clap but provides a nicer api imo

[dani-garcia]

Ah, I thought the structopt api was merged into clap too, but apparently that's scheduled to be released on the next version of clap 3.0!

I agree the declarative api of structopt is nicer, I'd prefer to use that too.

[tinywombat765]

I see that if the GIT_VERSION environment var is set at compile time the app with print that as it's version. Should I use that for the version flag? If so what should it print if anything it that var is not set? And if not what should I print?

[dani-garcia]

For the version flag I'd just print bitwarden_rs followed by a space and the GIT_VERSION value if present. Similar to how cargo --version or rustc --version do it.

If no version is provided, you could print something like.

bitwarden_rs (Version info from Git not present)

[tinywombat765]

I opened a PR #888

[dani-garcia]

Closed because #888 got merged