Participant's countries of Ruby with Shoes course 8th batch at RubyLearning.org

green_shoes_participants.rb

require 'green_shoes'
require 'mechanize'
begin
  require 'hpricot'
rescue LoadError 
  require File.join(Shoes::DIR, 'ext/hpricot')
end

include Hpricot

course = 'Ruby with Shoes 8th Batch'
agent = Mechanize.new
login_page = agent.get "http://rubylearning.org/class/login/index.php"

login_form = login_page.forms.first
login_form['username'] = "xxxxx"  # input your username for RubyLearning.org
login_form['password'] = "xxxxx"  # input your password for RubyLearning.org
agent.submit login_form

main_page = agent.get 'http://rubylearning.org/class/course/index.php'

course_link = main_page.link_with text: course
course_page = agent.get course_link.href

participants_link = course_page.link_with text: 'Participants'
participants_page = agent.get participants_link.href

show_all_text = participants_page.search("//div[@id='showall']").inner_text
show_all_link = participants_page.link_with text: show_all_text
show_all_page = agent.get show_all_link.href

list, countries = [], []

doc = Hpricot show_all_page.body
doc.search("//td[@class='cell c3']").each do |e|
  n = e.inner_text.index(',')
  n = 0 unless n
  list << e.inner_text[0..n-1]
end

list.sort!
pn = list.length

until list.empty?
  country, rest = list.partition{|e| list.first == e}
  countries << [country.first, country.length]
  list = rest
end

countries = countries.sort_by{|c, n| n}.reverse
cn = countries.length

Shoes.app title: course, width: 380, height: 500 do
  stack width: 1.0, height: 22 * cn + 50 do
    background orangered..green, angle: 30
    para strong(' Participants: ', pn, ', Countries: ', cn), stroke: white
    countries.each_with_index do |e, i|
      y = 22 * i + 30
      nostroke
      rect width: 330, height: 20, left: 10, top: y, fill: rgb(75, 0, 130, 0.2), curve: 5
      para strong(e.first), left: 20, top: y, stroke: white
      para strong(e.last), left: 300, top: y, stroke: white
    end
  end
end

ruby_participants.rb

require 'mechanize'

course = 'Ruby with Shoes 8th Batch'

agent = Mechanize.new

login_page = agent.get "http://rubylearning.org/class/login/index.php"

login_form = login_page.forms.first
login_form['username'] = "xxxxx"  # input your username for RubyLearning.org
login_form['password'] = "xxxxx"  # input your password for RubyLearning.org
agent.submit login_form

main_page = agent.get 'http://rubylearning.org/class/course/index.php'

course_link = main_page.link_with text: course
course_page = agent.get course_link.href

participants_link = course_page.link_with text: 'Participants'
participants_page = agent.get participants_link.href

show_all_text = participants_page.search("//div[@id='showall']").inner_text
show_all_link = participants_page.link_with text: show_all_text
show_all_page = agent.get show_all_link.href

open(course + '.html', 'w'){|f| f.puts show_all_page.body}

shoes_participants.rb

require 'hpricot'

course = 'Ruby with Shoes 8th Batch'
list, countries = [], []

filename = course + '.html' 
doc = open(filename){|f| Hpricot(f)}
doc.search("//td[@class='cell c3']").each do |e|
  n = e.inner_text.index(',')
  n = 0 unless n
  list << e.inner_text[0..n-1]
end

list.sort!
pn = list.length

until list.empty?
  country, rest = list.partition{|e| list.first == e}
  countries << [country.first, country.length]
  list = rest
end

countries = countries.sort_by{|c, n| n}.reverse
cn = countries.length

titlename = 'Ruby with Shoes 8th Batch'

Shoes.app title: titlename, width: 380, height: 500 do
  stack width: 1.0, height: 22 * cn + 50 do
    background orangered.to_s..green.to_s, angle: 30
    para strong('Participants: ', pn, ', Countries: ', cn), stroke: white
    countries.each_with_index do |e, i|
      y = 22 * i + 30
      nostroke
      rect width: 330, height: 20, left: 10, top: y, fill: rgb(75, 0, 130, 0.2), curve: 5
      para strong(e.first), left: 20, top: y, stroke: white
      para strong(e.last), left: 300, top: y, stroke: white
    end
  end
end

Uploaded Green Shoes version.
Usage: just only run ruby green_shoes_participants.rb

The differences between Red Shoes and Green Shoes are,

• the way to require Hpricot
• there is no need to add to_s for color gradation in Green Shoes