Opting in to cops on a cop-by-cop basis?

[fj]

The documentation doesn't seem to cover the following use case:

• Run all the Lint cops.
• Only run some of the Style cops, on an opt-in basis, using .rubocop.yml.
• Don't run any other cops.

Is something like that possible?

[bbatsov]

Run all the Lint cops.

rubocop -l (this is mentioned in the README)

Only run some of the Style cops, on an opt-in basis, using .rubocop.yml.

Don't think that is possible at the moment (at least directly). @jonas054 might have more insight. I guess you can have a config that disabled all cops out-of-the box, inherit from it, and enable only the cops you want to enable.

Don't run any other cops.

Not sure what you mean. You can run a single cop with:

rubocop --only CopName

[fj]

Sorry, I don't think I was clear: I was describing one use case that covered all three of those bullets, not three separate cases. You're right that rubocop -l would handle the first one nicely.

That is, I want to run every Lint cop, and only some of the Style cops, and none of the other cops. It sounds like the best place to start is a config that explicitly disables every cop, but that would break as soon as any new cop is introduced, right?

[jonas054]

The way to achieve this is, as you suggest @fj, to copy config/enabled.yml, save it under the name .rubocop.yml and replace Enabled: true with Enabled: false for all the style cops you don't want to run. Rails cops (the other cops) are not run by default.

But you're right that it would break when style cops are added in later versions. There's no way to disable by default and opt in. If we want to add such functionality, I think the best way would be to

• allow a comma-separated list of cops for the --only option
• let rubocop --lint --only COPS mean to run all lint cops plus the listed COPS (today the --lint option is dropped with no warning)

[bbatsov]

👍 for running multiple cops with --only and allowing the combination of --lint and --only.

[fj]

OK, I think that should be a comparatively straightforward task.

I can work on a pull request, but I just want to point out that this would be a breaking change (rubocop --lint --only COPS means something different now than it will after the pull request is completed). Is that acceptable?

[bbatsov]

Yes, this is acceptable. We're pretty far away from a 1.0 release anyways. —
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On Thu, Apr 10, 2014 at 7:34 PM, John Feminella notifications@github.com
wrote:

OK, I think that should be a comparatively straightforward task.

I can work on a pull request, but I just want to point out that this would be a breaking change (rubocop --lint --only COPS means something different now than it will after the pull request is completed). Is that acceptable?

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