@prettier/plugin-ruby

What is @prettier/plugin-ruby?

@prettier/plugin-ruby is a plugin for Prettier that adds support for formatting Ruby code. It ensures that Ruby code adheres to a consistent style, making it easier to read and maintain.

What are @prettier/plugin-ruby's main functionalities?

Code Formatting

This feature automatically formats Ruby code to follow a consistent style. For example, it ensures proper indentation and spacing.

def hello_world
  puts 'Hello, world!'
end

Consistent Style

This feature enforces a consistent coding style across Ruby files, such as consistent use of spaces, line breaks, and other stylistic elements.

class Person
  attr_accessor :name, :age

  def initialize(name, age)
    @name = name
    @age = age
  end
end

Integration with Prettier

This feature allows the plugin to be easily integrated with Prettier, enabling seamless formatting of Ruby code alongside other supported languages.

{
  "plugins": ["@prettier/plugin-ruby"]
}

Other packages similar to @prettier/plugin-ruby

standard

Standard is a Ruby style guide, linter, and formatter based on RuboCop. It enforces a standard style and can automatically fix issues, similar to @prettier/plugin-ruby, but with a focus on simplicity and minimal configuration.

README

Prettier for Ruby

@prettier/plugin-ruby is a prettier plugin for the Ruby programming language and its ecosystem. prettier is an opinionated code formatter that supports multiple languages and integrates with most editors. The idea is to eliminate discussions of style in code review and allow developers to get back to thinking about code design instead.

For example, the below code segment:

        d=[30644250780,9003106878,
    30636278846,66641217692,4501790980,
 671_24_603036,131_61973916,66_606629_920,
   30642677916,30643069058];a,s=[],$*[0]
      s.each_byte{|b|a<<("%036b"%d[b.
         chr.to_i]).scan(/\d{6}/)}
          a.transpose.each{ |a|
            a.join.each_byte{\
             |i|print i==49?\
               ($*[1]||"#")\
                 :32.chr}
                   puts
                    }

when run through @prettier/plugin-ruby will generate:

d = [
  30_644_250_780,
  9_003_106_878,
  30_636_278_846,
  66_641_217_692,
  4_501_790_980,
  671_24_603036,
  131_61973916,
  66_606629_920,
  30_642_677_916,
  30_643_069_058
]
a, s = [], $*[0]
s.each_byte { |b| a << ('%036b' % d[b.chr.to_i]).scan(/\d{6}/) }
a.transpose.each do |a|
  a.join.each_byte { |i| print i == 49 ? ($*[1] || '#') : 32.chr }
  puts
end

Getting started

To run prettier with the Ruby plugin, you're going to need ruby (version 2.5 or newer) and node (version 8.3 or newer). If you're integrating with a project that is not already using prettier, you should use the Ruby gem. Otherwise you can use the npm package directly.

Ruby gem

Add this line to your application's Gemfile:

gem 'prettier'

And then execute:

bundle

Or install it yourself as:

gem install prettier

The rbprettier executable is now installed and ready for use:

bundle exec rbprettier --write '**/*.rb'

npm package

If you're using the npm CLI, then add the plugin by:

npm install --save-dev prettier @prettier/plugin-ruby

Or if you're using yarn, then add the plugin by:

yarn add --dev prettier @prettier/plugin-ruby

The prettier executable is now installed and ready for use:

./node_modules/.bin/prettier --write '**/*.rb'

Configuration

Below are the options (from src/ruby.js) that @prettier/plugin-ruby currently supports:

Name	Default	Description
printWidth	80	Same as in Prettier (see prettier docs).
requirePragma	false	Same as in Prettier (see prettier docs).
tabWidth	2	Same as in Prettier (see prettier docs).
addTrailingCommas	false	Adds a trailing comma to array literals, hash literals, and method calls.
inlineConditionals	true	When it fits on one line, allows if and unless statements to use the modifier form.
inlineLoops	true	When it fits on one line, allows while and until statements to use the modifier form.
preferHashLabels	true	When possible, uses the shortened hash key syntax, as opposed to hash rockets.
preferSingleQuotes	true	When double quotes are not necessary for interpolation, prefers the use of single quotes for string literals.

Any of these can be added to your existing prettier configuration file. For example:

{
  "preferSingleQuotes": false
}

Or, they can be passed to prettier as arguments:

prettier --prefer-single-quotes false --write '**/*.rb'

Contributing

Check out our contributing guide. Bug reports and pull requests are welcome on GitHub at https://github.com/prettier/plugin-ruby.

Code

Thanks goes to these wonderful people (emoji key):

Kevin Deisz 💻 📖 ⚠️ 🐛	Alan Foster 💻 📖 ⚠️ 🐛	johnschoeman ⚠️	Aaron Jensen 📖	Cameron Bothner 💻	localhost.dev 🐛 💻	David Buchan-Swanson 🐛 💻
Jordan Pickwell 🐛	Josh Justice 🐛	xipgroc 🐛	Gregoire Lejeune 🐛	Pete Van Klaveren 🐛	meleyal 📖	Lipis 📖
Jan Piotrowski 📖	Andy Waite 📖	Jonathan Viney 🐛	acrewdson 🐛	Louis Orleans 🐛	Colton Voege 🐛	Stefan Kracht 🐛
jakeprime 🐛	Mario Mainz 🐛	CL Web Developers 🐛	github0013 🐛	James Costian 🐛	Joe Jackson 🐛	Max Albrecht 🐛

This project follows the all-contributors specification. Contributions of any kind welcome!

Financial

You can support prettier/plugin-ruby on OpenCollective. Your organization's logo will show up here with a link to your website.

License

The package is available as open source under the terms of the MIT License.

Changelog

[0.16.0] - 2019-11-14

Added

• mmainz, kddnewton - Support for extra commas in multiple assignment, as it changes the meaning. For example,

<!-- prettier-ignore -->

a, = [1, 2, 3]

would previously get printed as a = [1, 2, 3], which changes the value of a from 1 to the value of the entire array.

• kddnewton - Experimental support for the HAMtemplate language.

Changed

• github0013, kddnewton - Support proper string escaping when the original string in the source is wrapped in %q|...|. For example, %q|\'| should get printed as "\'", where previously it was dropping the backslash.
• jamescostian, kddnewton - Force ternary breaking when using the lower-precendence operators and and or. For example,

<!-- prettier-ignore -->

if x.nil?
  puts 'nil' and return
else
  x
end

the previous expression was being transformed into a ternary which was invalid ruby. Instead it now stays broken out into an if/else block.

• localhostdotdev], [@joeyjoejoejr], [@eins78, kddnewton - Better support for embedded expressions inside heredocs. For example,

<!-- prettier-ignore -->

<<-HERE
  foo bar baz
  #{qux}
  foo bar baz
HERE

should remain formatted as it is. Whereas previously due to the way the lines were split, you would sometimes end up with it breaking after #{.

• jamescostian, kddnewton - Fix up return node printing. When returning multiple values, you need to return an array literal as opposed to using parentheses.