Ruby recursive installer (for rbenv users)

ruby-recursive-build.rb

#!/usr/bin/env ruby
# Ruby Recursive Build
# This script is intended for environment first setups automation, its homebrewed and tested only on my env.
# Use it at your own risk.
# I strongly recommend you to read the code through, and change it to fit your needs.
# It will look for your .ruby-version files and install all of 'em
# run this inside your Workspace folder

# Download it into your Workspace folder
# chmod +x ruby-recursive-building.rb
# ./ruby-recursive-building.rb
# wait & pray

EXTRAS=['bundler']

def detect_versions
  versions = []
  version_files = `find .|grep .ruby-version`.split("\n")
  version_files.each do |version_file|
    versions.push File.read(version_file).chop
  end
  versions.uniq
end

def will_install
  detect_versions-installed_versions
end

def install_versions(versions)
  versions.each {|v| install_version(v)}  
end

def install_version(version)
  puts "Installing #{version}..."
  `rbenv install #{version}`
  if $?.success?
    install_extras(version)
  else
    raise 'something went wrong!'
  end
end

def install_extras(version)
  puts "Installing EXTRAS for #{version}..."
  `rbenv shell #{version} && gem install #{EXTRAS.join(' ')}`
end

def installed_versions
  versions = []
  detected_versions = Dir.glob("#{ENV['HOME']}/.rbenv/versions/**")
  detected_versions.each {|v| versions.push v.split('/').last }
  versions.uniq
end

def run!
  versions = will_install
  puts 'Installing these versions:'
  versions.each {|v| puts "\r#{v}"}
  install_versions(versions)
end

run!