Parse yo' Gemfile

Gemfile.markdown

Parse yo' Gemfile

Want to parse a Gemfile? This finely does it. How you may ask? This file replicates the entire Gemfile functions (aka source, gem and group) and then executes the Gemfile in Ruby.

Security

As it executes the Gemfile, it can potentially contain malicious Ruby code. This could import your project and perform commands and I would recommend executing it in a safe/sandbox environment. An example would be through an external server and use an API. This way it is very easy to replicate your software and it is totally harmless.

<3 Have fun.

Example

Example Gemfile:

source 'http://rubygems.org'

gem 'rake'
gem 'rails'

group :assets do
  gem 'jquery-rails', '1.2.3'
end

Returned value (as a Ruby Hash aka Hash.new):

{
  sources: [
    #<RubyGemSource:0x000000000000 @url="http://rubygems.org">
  ],
  gems: [
    #<RubyGem:0x000000000000 @name="rake" @rubygems_url="http://rubygems.org/gems/rake" @version=nil @group=nil>,
    #<RubyGem:0x000000000000 @name="rails" @rubygems_url="http://rubygems.org/gems/rails" @version=nil @group=nil>,
    #<RubyGem:0x000000000000 @name="jquery-rails" @rubygems_url="http://rubygems.org/gems/jquery-rails" @version="1.2.3" @group="assets">
  ]
}

Gemfile.rb

# Each individual source
# Example: source 'http://rubygems.org'
class RubyGemSource
	attr_accessor :url

	def initialize(url)
		self.url = url
	end
end

# Each individual rubygem.
# Example: gem 'rails', '> 1.4.0'
class RubyGem
	attr_accessor :name, :rubygems_url, :version, :group

	def initialize(name, version = nil, group = nil)
		self.name = name
		self.rubygems_url = "http://rubygems.org/gem/#{name}"
		self.version = version
		self.group = group
	end

	def is_group?(name)
		self.group.to_sym == name.to_sym
	end

	def parse_version(version)
		Gem::Version.new(version)
	end
end

# A list of all sources and gems.
$output = {
	:sources => [],
	:gems => []
}

# Fake the Gemfile functions (i.e. source '', gem '' and group do .. end) and bind them to the code above!
def source(url); $output[:sources].push(RubyGemSource.new(url)); end
def group(groupname, &block); $group = groupname.to_s; yield; $group = nil; end
def gem(name, version = nil); $output[:gems].push(RubyGem.new(name, version, $group)); end

# Let's get it started - Black Eyed Peas style.
url = "./Gemfile"
load(url)

# Gimme everything.
puts $output.inspect