vendor/rails/railties/lib/commands/servers/base.rb

   1 def tail(log_file)
   2   cursor = File.size(log_file)
   3   last_checked = Time.now
   4   tail_thread = Thread.new do
   5     File.open(log_file, 'r') do |f|
   6       loop do
   7         f.seek cursor
   8         if f.mtime > last_checked
   9           last_checked = f.mtime
  10           contents = f.read
  11           cursor += contents.length
  12           print contents
  13         end
  14         sleep 1
  15       end
  16     end
  17   end
  18   tail_thread
  19 end
  20
  21 def start_debugger
  22   begin
  23     require_library_or_gem 'ruby-debug'
  24     Debugger.start
  25     Debugger.settings[:autoeval] = true if Debugger.respond_to?(:settings)
  26     puts "=> Debugger enabled"
  27   rescue Exception
  28     puts "You need to install ruby-debug to run the server in debugging mode. With gems, use 'gem install ruby-debug'"
  29     exit
  30   end
  31 end