feature: customize install features

[ToBinio]

Problem

cargo install supports enabling custom features for the installed crate. This is used in e.g diesel-cli. sadly (at least to my knowledge) this customization is not supported.

Solution

In my opinion, the best solution would be to add some sort of config file. Which stores all the enabled features of a crate and when a crate is going to be updated cargo-installed checks if there are any custom settings for it.

theoretically, this information could also be stored in the global config.toml but I think it would be simpler to add a new file.

note:
this could also be used to store ignored crates
if you want I could try implementing this

[light4]

Actually no need to save features to files. cargo-info or data from <crates.io> already have the features. We just need to keep the features when update.

[ToBinio]

I am probably missing something. But from where exactly can you get which features got enabled while installing the crate?

doesn't cargo-info and crates.io only have the data which features exits?

[ToBinio]

and what about storing ignored crates? I believe this definitely needs to be stored in a file.

storing ignored crates would be nice for e.g. sccache because it needs extra handling.