ID to screen name and followers count without twitter gem

id2scrn_no-twgem.rb

require 'optparse'
require 'net/http'
require 'json'

out_file = ''

opt = OptionParser.new
opt.on('-o output') {|v| out_file = v}

opt.parse!(ARGV)
abort('no source file') if ARGV.size == 0
src_file = ARGV[0]
abort('no source file') if src_file.empty?
if out_file.empty?
  out_file = src_file + '.out.csv'
end

# show opts
puts '-- opts --'
puts 'source file = ' + src_file
puts 'output file = ' + out_file
puts '-- run --'

# get users
open(src_file, 'r') do |src|
open(out_file, 'w') do |dst|
  src.each_slice(100) do |ids|
    body = Net::HTTP.get(URI('http://api.twitter.com/1/users/lookup.json?' + URI.encode_www_form({'user_id' => ids.join(',')})))
    json = JSON.parse(body)
    json.each do |user|
      dst.puts("#{user['id']},#{user['screen_name']},#{user['followers_count']}")
    end 
  end 
end
end