Rakefile

namespace :scala do
  download_scala = 'scala-2.10.0'

  def bin_files
    Dir['/usr/share/scala/bin/**'].select { |file_name| file_name !~ /\.+/ }.map { |file_name| file_name.match(/(\w+)$/).captures[0] }
  end

  desc "Download #{download_scala}"
  task :download do
    if File.exist?("/tmp/#{download_scala}.tgz")
      puts "Already downloaded #{download_scala}.tgz"
    else
      system <<-SCRIPT
        wget http://www.scala-lang.org/downloads/distrib/files/#{download_scala}.tgz -O /tmp/#{download_scala}.tgz
      SCRIPT
    end

    unless File.exist?("/tmp/#{download_scala}")
      puts "Extracting /tmp/#{download_scala}..."
      system "tar xzf /tmp/#{download_scala}.tgz -C /tmp/"
    end
  end

  task :move_source do
    if File.exist?('/usr/share/scala')
      puts "Already source moved"
    else
      puts "moving scala source to /usr/share/scala"
      system <<-SCRIPT
        sudo mv /tmp/#{download_scala} /usr/share/scala
      SCRIPT
    end
  end

  desc "Create scala bin files' symlink"
  task :create_symlink do
    bin_files.each do |bin_file|
      orig_file = "/usr/share/scala/bin/#{bin_file}"
      target_file = "/usr/bin/#{bin_file}"

      if File.exist?(target_file)
        puts "File already exist: #{bin_file}. skipping..."
        next
      end

      puts "linkng #{bin_file}..."
      system "sudo ln -s #{orig_file} #{target_file}"
    end
  end

  desc "Install scala"
  task :install do
    Rake::Task['scala:download'].execute
    Rake::Task['scala:move_source'].execute
    Rake::Task['scala:create_symlink'].execute
  end

  desc "Remove created scala bin files' symlink"
  task :uninstall do
    bin_files.each do |bin_file|
      target_file = "/usr/bin/#{bin_file}"
      next unless File.exist?(target_file)

      puts "unlinking #{bin_file}"
      system "sudo rm #{target_file}"
    end
  end
end

namespace :play do
  version = '2.1.0'
  download_play = "play-#{version}"

  desc "Download play 2.1"
  task :download do
    if File.exist?("/tmp/#{download_play}")
      puts "Already downloaded #{download_play}.zip"
    else
      system <<-SCRIPT        
        wget http://downloads.typesafe.com/play/#{version}/#{download_play}.zip -O /tmp/#{download_play}.zip
      SCRIPT
    end

    unless File.exist?("/tmp/#{download_play}")
      puts "Extracting /tmp/#{download_play}..."
      system "unzip -q /tmp/#{download_play}.zip -d /tmp/"
    end
  end

  task :move_source do
    if File.exist?('/usr/share/play')
      puts "Already source moved"
    else
      puts "moving scala source to /usr/share/play"
      system <<-SCRIPT
        sudo mv /tmp/#{download_play} /usr/share/play
      SCRIPT
    end
  end

  desc "Create play executable binary's symlink"
  task :create_symlink do
    orig_file = '/usr/share/play/play'
    target_file = '/usr/bin/play'

    if File.exist?(target_file)
      puts "File already exist: #{bin_file}. skipping..."
    else
      puts "linkng play..."
      system "sudo ln -s #{orig_file} #{target_file}"
    end
  end

  desc "Install play"
  task :install do
    Rake::Task['play:download'].execute
    Rake::Task['play:move_source'].execute
    Rake::Task['play:create_symlink'].execute
  end

  desc "Remove created play binary's symlink"
  task :uninstall do
    puts "unlinking play"
    system "sudo rm /usr/bin/play"
  end
end