Quick hacky recursive gem-dependency search script for Ruby

depsearch.rb

#!/usr/bin/env ruby
require 'logger'
require 'optparse'

require 'rubygems'
require 'net/http'
require 'net/https'
require 'json'

@log = Logger.new(STDERR)
@log.level = Logger::INFO

def make_request(url)
  @log.debug("Opening: #{url}")
  Timeout.timeout(5) do 
    uri = URI(url)
    http = Net::HTTP.new(uri.host, uri.port) 
    if uri.scheme == "https" then
      http.use_ssl = true
      http.verify_mode = OpenSSL::SSL::VERIFY_NONE
    end
    http.read_timeout = 5
    http.open_timeout = 5

    req = Net::HTTP::Get.new(uri.path.empty? ? '/' : uri.path)
    http.start do |h|
      h.request(req)
    end
  end
end

def recurse_dependencies(name, depth, block)
  # Fetch dependencies for this gem.
  url = "http://rubygems.org/api/v1/gems/#{name}.json"
  begin
    req = make_request(url)
  #rescue Exception => e
  #  @log.error("Exception: #{e.inspect}")
  #  return
  end

  info = JSON.parse(req.body)
  info['dependencies']['runtime'].each do |obj|
    depend = obj['name']
    requirements = obj['requirements']
    block.call(depend, requirements, depth + 1)
    recurse_dependencies(depend, depth + 1, block)
  end
end

def get_dependencies(root_gem, &block)
  block.call(root_gem, "", 0)
  recurse_dependencies(root_gem, 0, block)
end

def main()
  optparse = OptionParser.new do |opts|
    opts.banner = "Usage: #{$0} [options] gem"

    opts.on('-v', '--verbosity', 'Verbosity of debugging output') do
      @log.level -= 1
    end

    opts.on('-h', '--help', 'Display this message') do
      puts opts
      exit(1)
    end
  end
  optparse.parse!

  get_dependencies(ARGV[0]) do |name, requirements, depth|
    puts((" " * depth) + "#{name} #{requirements}")
  end
end


if $0 == __FILE__
  ret = main
  begin
    exit(ret)
  rescue TypeError
    exit(0)
  end
end