Eden is a source-code formatter for Ruby. It's designed around a robust lexical analyzer able to handle most of the dark corners of Ruby syntax, and able to be easily modified and extended.

Eden is available as a gem. To install it, simply run:

gem install eden

Eden's formatter modules are able to be configured using a Ruby configuration DSL. Eden loads defaults when it starts, but if you wish to override options on a project-specific basis, you can do so by creating a file config/eden.rb. For example, if you wish to use tabs instead of spaces to indent a project's code, put the following in config/eden.rb:

Indenter.configure do |i|
  i.indent_characters_per_step 1
  i.indent_character "\t"
end

Refer to lib/eden/defaults.rb for full configuration options.

Eden is designed to be used with a source-control system, so when it formats Ruby source files, it writes changes to the file in place. The basic format for running Eden is:

eden command filenames

Eden understands 2 commands:

• colorize - Displays a ANSI colorized version of the source. This is mainly used for debugging the lexer.
• rewrite - Rewrites the source files in place to be correctly formatted

Examples:

eden rewrite source_file.rb

will rewrite source_file.rb

eden rewrite ./**/*.rb

will rewrite all the .rb files in the current directory and any subdirectories.

Eden was created by Jason Langenauer (jason@jasonlangenauer.com or @jasonlangenauer on Twitter). Any feedback/comments/suggestions gratefully received.