sample bot

neko_dice.rb

require 'tw'
require 'json'
require 'ostruct'

# id, user, text, time, fav_count, rt_count
tweet = OpenStruct.new JSON.parse STDIN.gets

/^(@.+?)\s(.+)/ =~ tweet.text
user = $1
body = $2

abort 'invalid mention' if /@/ =~ body 

dice = body
  .split(/[[:space:]]/)
  .select {|x| x.length > 0 }
  .map {|x| x[0]}
  .reject {|x|
    (/[[:blank:]]/ =~ x) \
    || (/[[:cntrl:]]/ =~ x) \
    || (/[[:space:]]/ =~ x) \
    || (/[\/'"]/      =~ x)
  }
  .map {|x| [x, rand(100) + 1]}
  .sort_by {|x| x[1] * -1}
  .map {|x| x.join(' ')}
  .slice(0, 10)
  .join("\n")

message = [["@#{tweet.user}", 'にゃ〜ん'].join(' '), dice].join("\n")

client = Tw::Client.new
client.auth
client.tweet message, in_reply_to_status_id: tweet.id