feature: allow reading RHACK_DIR from .cargo/config.toml files.

[seivan]

Search order:

1. $RHACK_DIR
2. .cargo/config.toml
3. $CARGO_HOME/config.toml

[simonsan]

Will review later today, thank you for the PR, and sorry for the delay. 👍🏽

[seivan]

@simonsan Any updates?

[simonsan]

@simonsan Any updates?

Wtf, sorry I totally forgot. Will do it in the evening!

[simonsan]

Ok, I was looking into it. Could you say a bit about the value reading the .cargo/config.toml gives? My intention was to migrate it to abscissa and have a usual configuration within a directory according to directories project-dir. So I'm not entirely sure about this, but happy to be explained what it is making better.

[seivan]

Ok, I was looking into it. Could you say a bit about the value reading the .cargo/config.toml gives?

It reads a path to store the "hacks". This makes sure you can define it in your projects Cargo.toml or use a global config like $CARGO_HOME.

Right now it puts all of them in a single place. This lets you have a per project setting if you want.