A quick and crappy script to extract gems versions from Gemfile.lock, back into Gemfile

freeze.rake

# utterly crappy proof-of-concept that works. for me. today.
task :freeze do
  require 'bundler_auto_update'
  include Bundler::AutoUpdate
  
  locked_gems = IO.read('Gemfile.lock').match(/^GEM.*^PLATFORMS$/m).to_s.split("\n").grep(/^\s{4}\w/).map(&:strip)
  locked_gems = locked_gems.inject({}) { |result, gem| result.merge!(Hash[[gem.gsub(/\(|\)/, '').split]]); result}
  
  gemfile = Gemfile.new
  gemfile.gems.each do |g|
    updater = GemUpdater.new(g, gemfile, nil)
    if (!updater.send(:updatable?)) && (!locked_gems[g.name].blank?)
      puts "Freezing #{g.name} at #{locked_gems[g.name]}"
      new_content = ""
      IO.read('Gemfile').each_line do |line|
        if line =~ /^\s*gem\s*['"]#{g.name}['"]\s*$/
          line.gsub!("\n", ", \"#{locked_gems[g.name]}\"\n")
        end
        new_content += line
      end
      File.open('Gemfile', 'w') { |f| f << new_content }
    end
  end
end