confy VS config-rs

I'd really recommend confy! It does exactly what you seem to want and supports YAML, TOML, and RON :)

I use confy for persisted data (just the token and high score for now) because I don't know the best practices for where to put those kinds of files, which stores it as TOML.

Confy might do it for you : https://github.com/rust-cli/confy

I like config.rs, but I am struggling to overwrite config profiles with environment variables. The desired config is mixed, like .toml

Consider config crate. It could be like:

I've been using Config most of the time. I also use once_cell to make it a static variable.

I've enjoyed using this one: https://crates.io/crates/config

Anyone know of a library like https://github.com/netflix/go-env but for rust? I found https://github.com/mehcode/config-rs but it's just not as simple...

I was just in that space today. The config crate has an example you might find useful: https://github.com/mehcode/config-rs/tree/master/examples/hierarchical-env

How it differs from config?

Checking an environment variable is very easy with std::env::var or similar. If you have other bits of configuration that also change—which is typical; things like DB connection strings—you may consider a more full-featured solution like https://docs.rs/config/0.10.1/config/ (pay particular attention to this example, which seems to be very close to what you want: https://github.com/mehcode/config-rs/blob/master/examples/hierarchical-env/src/settings.rs ).

It's unfortunate, it looks like there was an attempt to get someone else to maintain it here, but no one ended up really stepping up to the plate.