A procedural macro to derive application info at compile time, using cargo compile-time env vars and `clap-rs`.
### Usage
```rust
#[appinfo::main]
fn main(){
println!("hello world");
cli.do_stuff();
server.listen(3000);
}
```
##### Add clap:
```bash
cargo add clap
cargo add appinfo
```
then in a terminal do:
```bash
Example:
❯ ./wonderful-cli -h
wonderful-cli (version: 0.1.0, commit revision: 0.1.0, repository: https://github.com/l-const/wonderful-cli) - A cli app that utilises the appinfo macro.
```
### Details:
* All the info are retrieved at compile time.
* Default env vars: https://doc.rust-lang.org/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-crates
* For more, see here: https://github.com/l-const/appinfo-rs/blob/main/src/cli.rs#L5-L9
### Future Enhacements
- [ ] Validation logic that the macro is applied only in `main`.
- [ ] Override of vars through the macro args.
- [ ] Overridable execution/usage info.
- [ ] Git commit revision using a compile/build time env var.