RuboCop is a Ruby static code analyzer. Out of the box it will enforce many of the guidelines outlined in the community Ruby Style Guide.
– From their GitHub README.md
We use RuboCop for most of our projects at Standout AB . It will
help the team to follow the style guide we all agreed on. If we change our
opinion it is also easy to just change the
.rubocop.yml file to match it.
Installing and configure RuboCop is pretty simple if you are following this Ruby Style Guide.
Just add it to your
gem "rubocop", require: false
And then run
bundle install in your terminal to install it.
You will already be able to run
rubocop in the terminal to analyze your code.
Project specific configurations
If you’re not completely satisfied with the Ruby Style Guide as is you can
create a file called
.rubocop.yml and add your settings there. Take a look at
the gem’s default configuration files to get an idea of what
you can change to match your or your’s team coding style.
Our configuration file looks like this:
# .rubocop.yml AllCops: RunRailsCops: true DisplayCopNames: true DisplayStyleGuide: true Exclude: - "bin/*" - Capfile - config/boot.rb - config/environment.rb - config/initializers/version.rb - db/schema.rb - Gemfile - Guardfile - Rakefile Metrics/LineLength: Exclude: - "config/**/*" Style/ClassAndModuleChildren: Enabled: false Style/Documentation: Enabled: false Style/DoubleNegation: Enabled: false Style/SpaceAroundEqualsInParameterDefault: EnforcedStyle: no_space Style/StringLiterals: EnforcedStyle: double_quotes Style/TrivialAccessors: AllowPredicates: true Style/SingleSpaceBeforeFirstArg: Enabled: false
Feel free to copy and change. You can also get the up to date version with curl at any time.
curl -o .rubocop.yml https://raw.githubusercontent.com/standout/Coding/master/ruby/rubocop.yml
Ignore current errors for bigger projects
If you’re not starting a new project you may find out that you already have a
lot of errors and warnings when you run
rubocop. If you have a huge code base
and not the time to fix it all now, you can tell RuboCop to create you a todo
file. The point of this file is to ignore all current errors and you should try
to remove settings from this file over time until you can remove the hole file.
This file is called
.rubocop_todo.yml and can be created using:
You also need to add this at the top of your
.rubocop.yml file to load it: