Using Rubocop

CLI commands

Run

$ bundle exec rubocop

Run and fix issues automatically

$ bundle exec rubocop --safe-auto-correct

Same but for cowboys!

$ bundle exec rubocop -a

Do that to staged files only

rubocop -a `git diff --name-only --cached | grep '\.rb'`

Generate a ‘todo’ config file to exclude all current isssues

$ rubocop --auto-gen-config

Config options

Config is in .rubocop.yml.

Some rules are configurable

Layout/LineLength:
  Max: 90

Some rules don’t make sense

Bundler/OrderedGems:
  Enabled: false

Or you may want to disable everything to then start slowly whitelisting rules

AllCops:
  DisabledByDefault: true