Infer TargetRubyVersion from .ruby_version file

[blimmer]

Rubocop will default to reading the .ruby_version file if the TargetRubyVersion parameter is not present in your rubocop configuration. Here's the PR that implemented that behavior on the rubocop side.

It would be nice to add that behavior to this linter.

[maschwenk]

If you look at this PR (rubocop/rubocop#3261), they actually slightly modified the logic to make it so that if you define TargetRubyVersion, it'll still take precedence over .ruby-version. So, if you remove TargetRubyVersion from your .rubocop.yml you should see that this functionality already works, no new code required.

Let me know if it's working for you and I'll close the issue

[blimmer]

I don't have TargetRubyVersion set in my rubocop config and I'm getting warnings about the safe navigation operator in my editor with a 2.3 ruby version file. When I run rubocop from the command line I don't get these errors.

[maschwenk]

Ahh I see what's happening. The problem is that the linter is running rubocop in the directory that the file being linted is located. So if you're linting a file in /specs and .ruby-version is in the root folder, it's running rubocop in /specs and therefore not finding the .ruby-version file. I will investigate further.

[blimmer]

Ah sure that makes sense. Thanks for investigating!

[chrishough]

+1

[maschwenk]

Please let me know if the fix above resolved your issue. Thanks!

[blimmer]

@maschwenk looks great! thank you, this is going to help me out a ton!!