Option to print the status of all clippy lints

[flaviojs]

There is no way to see the status of all lints right now. (allow, warn, deny, disabled?)

I was getting more warnings in the unix CI than in my unix VM.
Later I found the cause was not using --all-features in the VM command.
I didn't expect it to change the lints, only my code, and debugging this was terrible because I can't see the status of the lints.

The output could be in clippy.toml format with everything explicit. (serialize to toml)
This would facilitate the creation of that file since there would be a clear reference.

[flaviojs]

As for the command, maybe cargo clippy --print lints? (inspired by rustc)

[flip1995]

Specifying --all-features doesn't enable or disable more Clippy lints. It turns on the features of the linted crate and therefore more code is linted. All lints with their levels are defined here: https://rust-lang.github.io/rust-clippy/master/index.html (or if you use a specific version of Clippy, select it here: https://rust-lang.github.io/rust-clippy/)

The clippy.toml file is not there to allow or deny lints. It probably never will be. If something like this would be implemented it would be a lint.toml file in cargo, that specifies lints by lint tool (rustc or Clippy and maybe more in the future).

For a list of lints, there's the command cargo clippy -- -W help. This is not documented, since it is not at all stable.

[flaviojs]

Weird... I think that the code with extra warnings was always compiled. (in the lib, not a test)
Ignoring test (standard feature), the only feature I have is enabled by default.
It pulls the dependencies of the optional binary that the crate can build.

cargo clippy -- -W help seems to be enough for debug purposes, thanks.

[lnicola]

cargo clippy -- -W help seems to run clippy, so it takes a while on a first build and, of course, it requires a project. Would it be possible to print the available lints and quit, similar to rustc -W help?

Context: in rust-analyzer we'd like to offer code completions for the various lints, but the only way to get them is to download http://rust-lang.github.io/rust-clippy/master/lints.json.