gem maintenance evaluator

gem_maintainedness_finder.rb

require 'git'
require 'bundler'
require 'json'
require 'pry'

def gem_freshness_map(lockfile)
  {}.tap do |gem_freshness|
    uris = lockfile.specs.each do |spec|
      clazz = spec.source.class
      puts "Evaluating #{spec.name}"
      if clazz == Bundler::Source::Rubygems
        gem_freshness.merge!(rubygem_latest_version_date(spec))
      elsif clazz == Bundler::Source::Git
        gem_freshness.merge!(git_gem_latest_version_date(spec))
      else
        puts clazz
      end
    end
  end
end

def rubygem_latest_version_date(spec)
  gem_name = spec.name
  gem_info_file = "/tmp/rubygems_version_info_#{gem_name}.json"
  unless File.exist? gem_info_file
    gem_json = `curl -q https://rubygems.org/api/v1/versions/#{gem_name}.json > #{gem_info_file}`
  end
  begin
    gem_version_json = JSON.parse(File.read(gem_info_file))
    most_recent_version_date = gem_version_json.map { |version| Time.parse(version['built_at']) }.sort.last
    {gem_name => most_recent_version_date}
  rescue JSON::ParserError => e
    p e.message
    {gem_name => Time.now} # can't tell because it's probably an internal gem
  end
end

def git_gem_latest_version_date(spec)
  gem_name = spec.source.name
  {gem_name => date_of_last_commit(spec.source.uri, gem_name)}
end

def date_of_last_commit(uri, name)
  gem_copy_directory = "/tmp/checkout_#{name}_#{Time.now.strftime("%Y-%m-%d")}"
  return Time.now if name == 'parallel_tests' # 60 sec instead of < 1 sec
  if Dir.exist? gem_copy_directory
    g = Git.open(gem_copy_directory + "/#{name}")
  else
    g = Git.clone(uri, name, :path => gem_copy_directory, depth: 1)
  end
  g.log.first.date
end

def _pretty(freshness_map)
  max_display_length = freshness_map.keys.map { |k| k.length }.max
  freshness_map.sort_by { |k, v| v }.to_h.map { |k, v|
    "#{k}#{' ' * (max_display_length - k.length)}last updated: #{v}"
  }
end

lockfile = Bundler::LockfileParser.new(Bundler.read_file("Gemfile.lock"))
freshness_map = gem_freshness_map(lockfile)

count_to_show = ARGV[0] || 5
puts "These are not how old our gems are; this is how old our gems would be if we updated all of them."
puts "Oldest #{count_to_show}:"

puts _pretty(freshness_map)[0..count_to_show.to_i]

# ruby up_to_date_gemfinder.rb 10
# These are not how old our gems are; this is how old our gems would be if we updated all of them.
# Oldest 10:
# capistrano-ext               last updated: 2008-06-14 06:00:00 UTC
# colored                      last updated: 2010-02-10 08:00:00 UTC
# vegas                        last updated: 2010-10-11 07:00:00 UTC
# erubis                       last updated: 2011-04-01 15:00:00 UTC
# rack-cache                   last updated: 2012-03-05 00:00:00 UTC
# sql_queries_count            last updated: 2012-04-02 00:00:00 UTC
# journey                      last updated: 2012-06-14 00:00:00 UTC
# pbkdf256                     last updated: 2012-09-27 00:00:00 UTC
# fssm                         last updated: 2013-01-27 00:00:00 UTC
# net-ssh-gateway              last updated: 2013-02-06 00:00:00 UTC
# trackless_triggers           last updated: 2013-03-05 00:00:00 UTC