Add --all-features to cargo add

[SteveLauC]

Problem

Sometimes, I want to add a crate and blindly enable all the features. For example, Nix puts almost all the interfaces behind at least 1 feature gate, to use an interface, one has to enable the corresponding feature, which is good for reducing the compilation time.

But there are cases where I don't want to bother with that, it is a pain to open the doc, and figure out the feature name used by the interface I want to use and enable it.

If cargo add has a --all-features flag, then I can just enable all the features with it.

Proposed Solution

If would be nice if --all-features could be supported by cargo add, i.e., add the dependencies and enable all their features.

One alternative way to solve the issue is to provide a full feature in Nix, like tokio does, so that I can:

$ cargo add nix --features full

Notes

No response

[heisen-li]

@rustbot label +Command-add

[weihanglo]

Just check the original cargo-edit before it got moved into cargo. It didn't have the --all-features flag as well, so I guess we just never though of that.

Would you mind sharing more on the use cases you have? It is helpful for us to think through them and might come up other creative alternatives.

[SteveLauC]

Hi, thanks for the reply!

Would you mind sharing more on the use cases you have?

Currently, the only usage I have is the one described here