Mute 'em All

mute.rb

require 'twitter' # $ gem install twitter

# use your app's credentials
client = Twitter::REST::Client.new do |conf|
  conf.consumer_key = ""
  conf.consumer_secret = ""
  conf.access_token = ""
  conf.access_token_secret = ""
end

# verify credentials, then confirm
screen_name = client.verify_credentials.screen_name
puts "you are logged in as @#{screen_name}. Are you sure to mute everybody you are following? (y/N)"

exit unless STDIN.gets.chomp.downcase == 'y'

# get following/muted users
following = client.friend_ids(screen_name).to_a
muted = client.muted_ids(screen_name).to_a

# mute 'em all!
ids_to_mute = following - muted
ids_to_mute.each do |id|
  begin
    # in my case, around 200 accounts per 15 minutes was the rate limit of mute API
    # (though it was 15 accounts per 15 minutes according to docs)
    result = client.mute id
  rescue Twitter::Error::TooManyRequests => err
    puts "Failed to mute, trying again in #{err.rate_limit.reset_in || 15 * 60} sec"
    sleep (err.rate_limit.reset_in || 15 * 60) + 1
    retry
  end
  puts "the user with id #{id} was muted." 
end

puts "Finished!"