Feature: cargo env simplified

[ishitatsuyuki]

This is a proposal of a more clean wrapper around Cargo.toml.

Right now the macro only supports version and author. If all things supported (package name, description) are taken into place, this would be cool.

Macro proposal: a wrapper around clap_app

clap_cargo_app!(
    // package name, version, authors, descriptions are taken into place, if applicable
    (@arg ...)
)

[kbknapp]

Great idea! I think this would require each of those be implemented as separate macros, but you're right, I'd also like a single macro to pull in everything. Let me mull over the implementation over the holidays and I'll post back here.

The only thing I don't really want to do is have a clap_app! and clap_cargo_app! macro. I'd like to either combine these into the clap_app! macro, or do something like a app_with_defaults! macro.

i.e.

let app = app_from_crate!()
    // continue builder like normal

The above being the same as

let app = App::new(crate_name!())
    .version(crate_version!())
    .author(crate_authors!())
    .about(crate_description!())
    // other builders like normal.

[kbknapp]

ToDo

• Add crate_description!
• crate_description! docs
• Add crate_name!
• crate_name! docs
• Add app_from_crate!
• app_from_crate! docs

[kbknapp]

Big thanks to @nabijaczleweli for implementing this 👍

[nabijaczleweli]

I aim to please