2.2. Using config files feedback

[jpmckinney]

Going through the TODO on the page:

Evaluate crates that exist

https://docs.rs/config/latest/config/ seems to be the most popular crate.

Cli-args + multiple configs + env variables

clap has an env method/feature that allows setting an environment variable to read from if the CLI argument isn't present

To throw in configuration files, there's an open issue: clap-rs/clap#748 There are also various (less popular) crates that integrate with clap by third-party authors.

Can configure do all this? Is there a nice wrapper around it?

configure hasn't had a release in 5 years. I don't think it's relevant anymore.

[epage]

For evaluating which config crate, we have started but not finished https://github.com/rosetta-rs/config-rosetta-rs to compare them. We plan to talk further about them in the WG-CLI meetings

For general layered config, clap's env support is unlikely sufficient. As for layered configs and clap, the most relevant link is clap-rs/clap#2763.