karmi · January 9, 2016 18:06
diff --git a/index.html b/index.html
 <!DOCTYPE html>
 <html>
 <head>
  <title></title>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
 </head>
 <body>

 </body>
 </html>
diff --git a/Rakefile b/Rakefile
 task :default => :server

 # Serving files via Rack

 desc "Serve the files via Rack and Thin"
 task :server => [:dependencies] do
  port = ENV['PORT'] || 8000
  puts "Launching local webserver at <http://localhost:#{port}> ...", "-"*80

  begin
    Thin::Logging.silent = true
    Thin::Server.start port, lambda { |env|
      if env['PATH_INFO'] == '/'
        [200, {'Content-Type' => 'text/html'}, File.new('index.html')]
      else
        Rack::Directory.new('.').(env)
      end
    }
  rescue Exception => e
    if e.message =~ /no acceptor/
      puts "[!] Port #{port} not available, trying next one...", ""
      port += 1
      puts "Launching local webserver at <http://localhost:#{port}> ...", "-"*80
      retry
    end
    raise
  end
 end

 task :dependencies do
  %w| rack thin |.each do |lib|
    begin
      require lib
    rescue LoadError
      puts "[!] Required gem '#{lib}' not found, please install it with:", "",
           "    $ gem install #{lib}", "",
           "-"*80
      raise
    end
  end
 end

 # Stepping through the tutorial

 begin
  require 'term/ansicolor'
  class String
    include Term::ANSIColor
  end
 rescue LoadError
  class String
    def black; self; end
    def on_green; self; end
    def on_yellow; self; end
  end
 end

 _ = '-'*80

 desc "List the steps of this tutorial"
 task :steps do
  puts _, "Steps of this tutorial", _
  current = GitSteps.current_step

  GitSteps.steps.each_with_index do |step, i|
    is_current = step.sha == current.sha ? "*" : " "
    puts "#{is_current} #{(i+1).to_s.rjust(3).bold} | #{step.subject.gsub(/^\[\d+\] /, '')}"
  end; puts
 end

 desc "Display current step"
 task :step => [:check] do
  step = GitSteps.current_step
  puts _, "#{step.sha} | #{step.subject.bold}",
       _, "#{step.body}"
 end

 desc "Start the tutorial or switch back to first step"
 task :start => [:check] do
  puts _, "Starting the tutorial with the first step".white.on_magenta, _
  step = GitSteps.steps.first
  puts "#{step.sha} | #{step.subject.bold}",
       "#{step.body}"
  exec "git checkout #{step.sha} > /dev/null 2>&1 "
 end

 desc "Step to the next step of tutorial"
 task :next => [:check] do
  if step = GitSteps.next_step
    puts _, "#{step.sha} | #{step.subject.bold}",
         _, "#{step.body}"
    exec "git checkout #{step.sha} > /dev/null 2>&1 "
  else
    puts "You have reached the end of the tutorial".white.on_green,
         "Start again with: rake start"
  end
 end

 desc "Step to the previous step of tutorial"
 task :previous => [:check] do
  if step = GitSteps.previous_step
    puts _, "#{step.sha} | #{step.subject.bold}",
         _, "#{step.body}"
    exec "git checkout #{step.sha} > /dev/null 2>&1 "
  else
    puts "You are at the beginning of the tutorial".white.on_green,
         "Follow the tutorial with: rake next"
  end
 end

 desc "Show differences between the current step and the previous step"
 task :diff do
  current = GitSteps.current_step
  previous = GitSteps.previous_step
  (puts "[!] Cannot find previous step".white.on_red; exit(1)) unless previous
  puts _, "Previous : #{previous.subject}",
          "Current  : #{current.subject}", _
  exec "git diff --color --ignore-all-space --minimal HEAD^ HEAD | cat"
 end

 desc "Reset the tutorial and switch to master branch"
 task :reset => [:check] do
  exec "git checkout master > /dev/null"
 end

 task :check do
  if `which git` == ''
    puts "[!] ERROR: You need Git installed to step through the tutorial.".white.on_red
    exit(1)
  end
 end

 module GitSteps
  class Commit
    attr_reader :sha, :subject, :body
    def initialize(commit)
      @sha, @subject = commit.split('|||', 2)
      @body          = %x[git log -n 1 --format='%b' #{sha}].chomp
    end
    def step?; subject =~ /^\[\d+\]/; end
  end

  def steps
    %x[git log --reverse --format='%h|||%s' master]
      .chomp
      .split("\n")
      .map    { |commit| Commit.new(commit) }
      .select { |commit| commit.step? }
  end

  def current_step
    Commit.new( %x[git log -n 1--reverse --format='%h|||%s'].chomp )
  end

  def next_step
    steps.select { |step| step.subject > current_step.subject }.first
  end

  def previous_step
    steps.select { |step| step.subject < current_step.subject }.last
  end

  extend self
 end
	<!DOCTYPE html>
	<html>
	<head>
	<title></title>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	</head>
	<body>

	</body>
	</html>
	task :default => :server

	# Serving files via Rack

	desc "Serve the files via Rack and Thin"
	task :server => [:dependencies] do
	port = ENV['PORT'] \|\| 8000
	puts "Launching local webserver at <http://localhost:#{port}> ...", "-"*80

	begin
	Thin::Logging.silent = true
	Thin::Server.start port, lambda { \|env\|
	if env['PATH_INFO'] == '/'
	[200, {'Content-Type' => 'text/html'}, File.new('index.html')]
	else
	Rack::Directory.new('.').(env)
	end
	}
	rescue Exception => e
	if e.message =~ /no acceptor/
	puts "[!] Port #{port} not available, trying next one...", ""
	port += 1
	puts "Launching local webserver at <http://localhost:#{port}> ...", "-"*80
	retry
	end
	raise
	end
	end

	task :dependencies do
	%w\| rack thin \|.each do \|lib\|
	begin
	require lib
	rescue LoadError
	puts "[!] Required gem '#{lib}' not found, please install it with:", "",
	" $ gem install #{lib}", "",
	"-"*80
	raise
	end
	end
	end

	# Stepping through the tutorial

	begin
	require 'term/ansicolor'
	class String
	include Term::ANSIColor
	end
	rescue LoadError
	class String
	def black; self; end
	def on_green; self; end
	def on_yellow; self; end
	end
	end

	_ = '-'*80

	desc "List the steps of this tutorial"
	task :steps do
	puts _, "Steps of this tutorial", _
	current = GitSteps.current_step

	GitSteps.steps.each_with_index do \|step, i\|
	is_current = step.sha == current.sha ? "*" : " "
	puts "#{is_current} #{(i+1).to_s.rjust(3).bold} \| #{step.subject.gsub(/^\[\d+\] /, '')}"
	end; puts
	end

	desc "Display current step"
	task :step => [:check] do
	step = GitSteps.current_step
	puts _, "#{step.sha} \| #{step.subject.bold}",
	_, "#{step.body}"
	end

	desc "Start the tutorial or switch back to first step"
	task :start => [:check] do
	puts _, "Starting the tutorial with the first step".white.on_magenta, _
	step = GitSteps.steps.first
	puts "#{step.sha} \| #{step.subject.bold}",
	"#{step.body}"
	exec "git checkout #{step.sha} > /dev/null 2>&1 "
	end

	desc "Step to the next step of tutorial"
	task :next => [:check] do
	if step = GitSteps.next_step
	puts _, "#{step.sha} \| #{step.subject.bold}",
	_, "#{step.body}"
	exec "git checkout #{step.sha} > /dev/null 2>&1 "
	else
	puts "You have reached the end of the tutorial".white.on_green,
	"Start again with: rake start"
	end
	end

	desc "Step to the previous step of tutorial"
	task :previous => [:check] do
	if step = GitSteps.previous_step
	puts _, "#{step.sha} \| #{step.subject.bold}",
	_, "#{step.body}"
	exec "git checkout #{step.sha} > /dev/null 2>&1 "
	else
	puts "You are at the beginning of the tutorial".white.on_green,
	"Follow the tutorial with: rake next"
	end
	end

	desc "Show differences between the current step and the previous step"
	task :diff do
	current = GitSteps.current_step
	previous = GitSteps.previous_step
	(puts "[!] Cannot find previous step".white.on_red; exit(1)) unless previous
	puts _, "Previous : #{previous.subject}",
	"Current : #{current.subject}", _
	exec "git diff --color --ignore-all-space --minimal HEAD^ HEAD \| cat"
	end

	desc "Reset the tutorial and switch to master branch"
	task :reset => [:check] do
	exec "git checkout master > /dev/null"
	end

	task :check do
	if `which git` == ''
	puts "[!] ERROR: You need Git installed to step through the tutorial.".white.on_red
	exit(1)
	end
	end

	module GitSteps
	class Commit
	attr_reader :sha, :subject, :body
	def initialize(commit)
	@sha, @subject = commit.split('\|\|\|', 2)
	@body = %x[git log -n 1 --format='%b' #{sha}].chomp
	end
	def step?; subject =~ /^\[\d+\]/; end
	end

	def steps
	%x[git log --reverse --format='%h\|\|\|%s' master]
	.chomp
	.split("\n")
	.map { \|commit\| Commit.new(commit) }
	.select { \|commit\| commit.step? }
	end

	def current_step
	Commit.new( %x[git log -n 1--reverse --format='%h\|\|\|%s'].chomp )
	end

	def next_step
	steps.select { \|step\| step.subject > current_step.subject }.first
	end

	def previous_step
	steps.select { \|step\| step.subject < current_step.subject }.last
	end

	extend self
	end