tip.js

function(payload){
  var key = 'tips'
  if(payload.type == "emessage"){
    var keyword = /^\s*(\S+)\+\+\s*$/
    var match = keyword.exec(payload.message)
    if(match){
      tip(payload.target, match[1])
    }
  }

  function tip(channel, username){
    var tip = get_tip(channel, username)
    tip.magnitude += 1
    bot.say("#zrobo",tip.username+" now has "+tip.magnitude+" in tips.")
    tip.last_tipped_at = new Date()
    save_tip(tip)
  }

  function save_tip(tip){
    var tips = get_tips()
    tips[tip.channel+":"+tip.username] = tip
    save_tips(tips)
  }

  function get_tip(channel, username){
    var tips = get_tips()
    var tip = tips[channel+":"+username]
    if(tip) { 
      return tip 
    } else {
      var new_tip = {username: username, last_tipped_at: null, 
                     channel: channel, magnitude: 0}
      return new_tip
    }
  }

  function get_tips(){
    var tips = db.get(key)
    if(tips) { return JSON.parse(tips) } else { return {} }
  }

  function save_tips(tips){
    db.set(key, JSON.stringify(tips))
  }
}