hackevents.co parser and calender.

app.rb

# Create a file, call it "Gemfile" and write these 3 lines, then save it:
source "https://rubygems.org"
gem 'sinatra'
gem 'nokogiri'

# Run
bundle install
# from your terminal

# Create a file called "app.rb" and paste the follow lines (and run it with "ruby app.rb":
require 'rubygems'
require 'nokogiri'
require 'open-uri'
require 'date'
require 'sinatra'

class Hackathon
  attr_accessor :title
  attr_accessor :date
  attr_accessor :location
  
  def to_s
    [self.date, self.location, self.title].join(" - ")
  end
  
  def self.hackevents
    doc = Nokogiri::HTML(open('http://www.hackevents.co'))
    lines = doc.css('.accordion-title').map { |line| line.content }.uniq
    regex = /(\d{2}\.\d{2}.\d{4})\s\-\s(\w*)[\-\s]{,4}(.*)/

    hackathons = []

    lines.each do |line|
      line_parts = line.match(regex).to_a
      if line_parts.size >= 4
        hackathon = Hackathon.new
        hackathon.date      = Date.parse(line_parts[1])
        hackathon.location  = line_parts[2]
        hackathon.title     = line_parts[3]
        hackathons << hackathon
      end
    end

    hackathons.sort_by(&:date)
  end
end

class Date
  def beginning_of_week
    days_to_monday = self.wday!=0 ? self.wday-1 : 6
    (self - days_to_monday)
  end
end

class Calendar
  def self.show(data)
    start_date  = data.first.date.beginning_of_week
    end_date    = data.last.date.beginning_of_week
    today       = Time.now.to_date
    
    grouped_data = data.group_by(&:date)
    
    months = %w(Jan Feb Mär Apr Mai Jun Jul Aug Sep Okt Nov Dez)
    
    output = ""
    output << "<style>"
    output << "body { font-family: 'Helvetica Neue'; font-size: 12px; }"
    output << "table { width: 100%; border: 1px solid #EEEEEE; border-collapse: collapse; }"
    output << "td { height: 100px; width: 14%; vertical-align: top; }"
    output << "td.today { background-color: #F1F1F1; }"
    output << "tr, td, th { border: 1px solid #EEEEEE; }"
    output << "td, th { padding: 4px; }"
    output << "p { margin: 0; padding: 0; }"
    output << "p.day {  }"
    output << "p.event { background-color: orange; color: #FFFFFF; font-size: 12px; margin: 0 0 2px 0; }"
    output << "</style>"
    output << "<table>"
    output << "<tr><th>Mo</th><th>Di</th><th>Mi</th><th>Do</th><th>Fr</th><th>Sa</th><th>So</th></tr>"
    start_date.upto(end_date) do |date|
      if date.wday == 1
        output << "<tr>"
      end
      
      if date == today
        output << "<td class='today'>"
      else
        output << "<td>"
      end
      
      output << "<p class='day'>"
      output << "#{date.day}"
      if date.day == 1
        output << " – <strong>#{months[date.month]}</strong>"
      end
      output << "</p>"
      
      if grouped_data[date]
        grouped_data[date].each do |event|
          output << "<p class='event'>#{event.title} - #{event.location}</p>"
        end
      end
      
      
      output << "</td>"
      
      if date.wday == 0
        output << "</tr>"
      end
    end
    output << "</table>"
    
    return output
  end
end

get '/hackevents' do
  Calendar.show(Hackathon.hackevents)
end