# Inspired by rabbitmq.rake the Redbox project at http://github.com/rick/redbox/tree/master
require 'rake'
require 'fileutils'
require 'open-uri'

class RedisRunner
  
  def self.redisdir
    "/tmp/redis/"
  end
  
  def self.redisconfdir
    '/etc/redis.conf'
  end

  def self.dtach_socket
    '/tmp/redis.dtach'
  end

  # Just check for existance of dtach socket
  def self.running?
    File.exists? dtach_socket
  end
  
  def self.start
    puts 'Detach with Ctrl+\  Re-attach with rake redis:attach'
    sleep 3
    exec "dtach -A #{dtach_socket} redis-server #{redisconfdir}"
  end
  
  def self.start_detached
    system "dtach -n #{dtach_socket} redis-server #{redisconfdir}"
  end
  
  def self.attach
    exec "dtach -a #{dtach_socket}"
  end
  
  def self.stop
    system 'echo "SHUTDOWN" | nc localhost 6379'
  end

end

namespace :redis do
  
  desc 'About redis'
  task :about do
    puts "\nSee http://code.google.com/p/redis/ for information about redis.\n\n"
  end
  
  desc 'Start redis'
  task :start do
    RedisRunner.start
  end
  
  desc 'Stop redis'
  task :stop do
    RedisRunner.stop
  end
  
  desc 'Restart redis'
  task :restart do
    RedisRunner.stop
    RedisRunner.start
  end

  desc 'Attach to redis dtach socket'
  task :attach do
    RedisRunner.attach
  end
  
  desc 'Install the lastest verison of Redis from Github (requires git, duh)'
  task :install => [:about, :download, :make] do
    %w(redis-benchmark redis-cli redis-server).each do |bin|
      sh "sudo cp /tmp/redis/#{bin} /usr/bin/"
    end

    puts "Installed redis-benchmark, redis-cli and redis-server to /usr/bin/"
        
    unless File.exists?('/etc/redis.conf')
      sh 'sudo cp /tmp/redis/redis.conf /etc/'
      puts "Installed redis.conf to /etc/ \n You should look at this file!"
    end  
  end
  
  task :make do
    sh "cd #{RedisRunner.redisdir} && make clean"
    sh "cd #{RedisRunner.redisdir} && make"
  end
  
  desc "Download package"
  task :download do
    sh 'rm -rf /tmp/redis/' if File.exists?("#{RedisRunner.redisdir}/.svn")
    sh 'git clone git://github.com/antirez/redis.git /tmp/redis' unless File.exists?(RedisRunner.redisdir)

    if File.exists?("#{RedisRunner.redisdir}/.git")
      arguments = ENV['COMMIT'].nil? ? "pull" : "reset --hard #{ENV['COMMIT']}"
      sh "cd #{RedisRunner.redisdir} && git #{arguments}"
    end
  end    

  desc "Open an IRb session"
  task :console do
    RedisRunner.start_detached
    system "irb -I lib -I extra -r redis.rb"
    RedisRunner.stop
  end
end

namespace :dtach do
  
  desc 'About dtach'
  task :about do
    puts "\nSee http://dtach.sourceforge.net/ for information about dtach.\n\n"
  end
  
  desc 'Install dtach 0.8 from source'
  task :install => [:about] do
    
    Dir.chdir('/tmp/')
    unless File.exists?('/tmp/dtach-0.8.tar.gz')
      require 'net/http'
      
      url = 'http://downloads.sourceforge.net/project/dtach/dtach/0.8/dtach-0.8.tar.gz'
      open('/tmp/dtach-0.8.tar.gz', 'wb') do |file| file.write(open(url).read) end
    end

    unless File.directory?('/tmp/dtach-0.8')    
      system('tar xzf dtach-0.8.tar.gz')
    end
    
    Dir.chdir('/tmp/dtach-0.8/')
    sh 'cd /tmp/dtach-0.8/ && ./configure && make'    
    sh 'sudo cp /tmp/dtach-0.8/dtach /usr/bin/'
    
    puts 'Dtach successfully installed to /usr/bin.'
  end
end