Gemfileをパースする

Bundler::Definition.build('Gemfile', nil, nil).dependencies

Github: definition.rb

Sample

$ rails new demo
$ cd demo
$ ./bin/rails console

IRB

Parse Gemfile

irb> result = Bundler::Definition.build('Gemfile', nil, nil).dependencies
=> [<Bundler::Dependency type=:runtime name="rails" requirements="= 4.2.1">, <Bundler::Dependency type=:runtime name="sqlite3" requirements=">= 0">, <Bundler::Dependency type=:runtime name="sass-rails" requirements="~> 5.0">, <Bundler::Dependency type=:runtime name="uglifier" requirements=">= 1.3.0">, <Bundler::Dependency type=:runtime name="coffee-rails" requirements="~> 4.1.0">, <Bundler::Dependency type=:runtime name="jquery-rails" requirements=">= 0">, <Bundler::Dependency type=:runtime name="turbolinks" requirements=">= 0">, <Bundler::Dependency type=:runtime name="jbuilder" requirements="~> 2.0">, <Bundler::Dependency type=:runtime name="sdoc" requirements="~> 0.4.0">, <Bundler::Dependency type=:runtime name="byebug" requirements=">= 0">, <Bundler::Dependency type=:runtime name="web-console" requirements="~> 2.0">, <Bundler::Dependency type=:runtime name="spring" requirements=">= 0">]

All gems

irb> result.collect{|gem| gem.name }
=> ["rails", "sqlite3", "sass-rails", "uglifier", "coffee-rails", "jquery-rails", "turbolinks", "jbuilder", "sdoc", "byebug", "web-console", "spring"]

Gem

irb> gem = result.first

Name

irb> gem.name
=> "rails"

Type

irb> gem.type
=> :runtime

Platforms

irb> gem.platforms
=> []

Groups

irb> gem.groups
=> [:default]

Source

irb> gem.source
=> nil

Version

irb> gem.requirements_list
=> ["= 4.2.1"]