Prettier-plugin-ruby NPM

prettier-ruby

prettier-ruby is a prettier plugin for the Ruby programming language. 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.

Under the hood prettier-ruby uses Ruby's own ripper library which allows this package to maintain parity with the existing Ruby parser. prettier-ruby supports Ruby versions 2.5, 2.6, and trunk.

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-ruby will generate:

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

Getting started

First, add prettier-plugin-ruby to your package.json dependencies, then install using either npm install or yarn install.

Verify by running against a file:

prettier --write --plugin=prettier-plugin-ruby --parser=ruby path/to/file.rb

If you're happy, you can can run prettier on an entire codebase:

prettier --write --plugin=prettier-plugin-ruby --parser=ruby **/*.rb

Options

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

inlineConditionals - When it fits on one line, allow if and unless statements to use the modifier form.
inlineLoops - When it fits on one line, allow while and until statements to use the modifier form.
preferHashLabels - When possible, use the shortened hash key syntax, as opposed to hash rockets.
preferSingleQuotes - When double quotes are not necessary for interpolation, prefer the use of single quotes for string literals.

Development

After checking out the repo, run yarn and bundle to install dependencies. Then, run yarn test to run the tests. You can pretty print a Ruby source file by running yarn print [PATH].

Useful resources for understanding the AST structure are: