@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 (versions 2.5 and above). 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.

License

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

Contributors

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 🐛

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

Changelog

[0.15.0] - 2019-08-06

Changed

• dudeofawesome, kddnewton - If xstring literals (command line calls surrounded by backticks) break, then we indent and place the command on a new line. Previously, this was resulting in new lines getting added each time the code was formatted. Now this happens correctly.
• krachtstefan, kddnewton - When a while or until loop modifies a begin...end statement, it must remain in the modifier form or else it changes sematic meaning. For example,

<!-- prettier-ignore -->

begin
  foo
end while bar

cannot be transformed into:

<!-- prettier-ignore -->

while bar
  foo
end

because that would never execute foo if bar is falsy, whereas in the initial example it would have.

• jviney], kddnewton - When transforming a block into the Symbol#to_proc syntax from within a list of arguments inside of an aref node (i.e., foo[:bar.each), we can't put the block syntax inside the brackets.
• jakeprime, kddnewton - Values for the return keyword that broke the line were previously just printed as they were, which breaks if you have a block expression like an if or while. For example,

<!-- prettier-ignore -->

return foo ? bar : baz

if the line was set to very short would be printed as:

<!-- prettier-ignore -->

return if foo
  bar
else
  baz
end

which wouldn't work. Instead, they now get printed with parentheses around the value, as in:

<!-- prettier-ignore -->

return(
  if foo
    bar
  else
    baz
  end
)

• jakeprime, kddnewton - When switching from a double-quoted string to a single-quoted string that contained escaped double quotes, the backslashes would stay in the string. As in:

<!-- prettier-ignore -->

"Foo \"Bar\" Baz"

would get formatted as:

<!-- prettier-ignore -->

'Foo \"Bar\" Baz'

but now gets formatted as:

<!-- prettier-ignore -->

'Foo "Bar" Baz'