One of my lab's Hubot script

retrieve_plan.coffee

# Description:
#   Retrieve the plans which are on weekdays from specified Google Calendar. 
#
# Commands:
#   hubot #{Words to run this}
#
# Notes:
#   Displayed plan is found first.
#   PLEASE FIX ME!!!

module.exports = (robot) ->
  robot.respond /#{Words to run this}/i, (msg) ->
    request = require('request')
    xml2js = require('xml2js')

    now = new Date

    # hard coding...
    request.get {
      uri:'[Google Calendar URL (XML) is here]'
      json: false
      headers: {
        "accept-language": "ja,en;q=0.8"
      }
    }, (err, r, body) ->
      new xml2js.Parser().parseString(body, (err, result) ->
        plans = []

        trim = (str) ->
          str = str.replace(" ", "").replace("JST", "").replace("\n", "")
          str = str.replace("月", "Mon").replace("火", "Tue").replace("水", "Wed")
          return str.replace("木", "Thu").replace("金", "Fri")

        # the order of entries is created-date.
        result["feed"]["entry"].forEach((s) ->
          title = s.title[0]["_"]
          m = /(\d+\/\d+\/\d+[^<]*)<br/.exec(s.summary[0]["_"])
          if m?
            date_str = trim(m[1])
            m = /(\d+\/\d+\/\d+)/.exec(date_str)
            if m?
              date = new Date(m[1])
              plans.push(date_str) if /{Regexp is here}/i.test(title) && date > now # get a plan by regexp and push it
        )

        # order by date asc
        comp = (a, b) ->
          m = /(\d+\/\d+\/\d+)/.exec(a)
          lhs = new Date(m[0])
          m = /(\d+\/\d+\/\d+)/.exec(b)
          rhs = new Date(m[0])
          return lhs - rhs

        plans.sort(comp)

        msg.send ""+
          "Next will be held : "+plans[0]
      )