Class: Rerun::Runner

Inherits:
Object
  • Object
show all
Includes:
System
Defined in:
lib/rerun/runner.rb

Instance Method Summary collapse

Methods included from System

#app_name, #growl, #growl?, #growlcmd, #icon, #linux?, #mac?, #osx_foundation?, #windows?

Constructor Details

#initialize(run_command, options = {}) ⇒ Runner

Returns a new instance of Runner.



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# File 'lib/rerun/runner.rb', line 6

def initialize(run_command, options = {})
  @run_command, @options = run_command, options
  @run_command = "ruby #{@run_command}" if @run_command.split(' ').first =~ /\.rb$/
end

Instance Method Details

#clear? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rerun/runner.rb', line 26

def clear?
  @options[:clear]
end

#dir ⇒ Object 



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# File 'lib/rerun/runner.rb', line 18

def dir
  @options[:dir] || "."
end

#exit? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rerun/runner.rb', line 30

def exit?
  @options[:exit]
end

#git_head_changed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rerun/runner.rb', line 136

def git_head_changed?
  old_git_head = @git_head
  read_git_head
  @git_head and old_git_head and @git_head != old_git_head
end

#join ⇒ Object 



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# File 'lib/rerun/runner.rb', line 112

def join
  @watcher.join
end

#notify(title, body) ⇒ Object 



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# File 'lib/rerun/runner.rb', line 147

def notify(title, body)
  growl title, body
  puts
  say "#{app_name} #{title}"
end

#pattern ⇒ Object 



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# File 'lib/rerun/runner.rb', line 22

def pattern
  @options[:pattern] || DEFAULT_PATTERN
end

#read_git_head ⇒ Object 



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# File 'lib/rerun/runner.rb', line 142

def read_git_head
  git_head_file = File.join(dir, '.git', 'HEAD')
  @git_head = File.exists?(git_head_file) && File.read(git_head_file)
end

#restart ⇒ Object 



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# File 'lib/rerun/runner.rb', line 11

def restart
  @restarting = true
  stop
  start
  @restarting = false
end

#running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rerun/runner.rb', line 116

def running?
  signal(0)
end

#say(msg) ⇒ Object 



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# File 'lib/rerun/runner.rb', line 153

def say msg
  puts "#{Time.now.strftime("%T")} - #{msg}"
end

#signal(signal) ⇒ Object 



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# File 'lib/rerun/runner.rb', line 120

def signal(signal)
  Process.kill(signal, @pid)
  true
rescue
  false
end

#start ⇒ Object 



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# File 'lib/rerun/runner.rb', line 34

def start
  if windows?
    raise "Sorry, Rerun does not work on Windows."
  end

  if (!@already_running)
    taglines = [
      "To infinity... and beyond!",
      "Charge!",
    ]
    notify "launched", taglines[rand(taglines.size)]
    @already_running = true
  else
    taglines = [
      "Here we go again!",
      "Keep on trucking.",
      "Once more unto the breach, dear friends, once more!",
      "The road goes ever on and on, down from the door where it began.",
    ]
    notify "restarted", taglines[rand(taglines.size)]
  end

  print "\033[H\033[2J" if clear?  # see http://ascii-table.com/ansi-escape-sequences-vt-100.php

  @pid = Kernel.fork do
    begin
      # Signal.trap("INT") { exit }
      exec(@run_command)
    rescue => e
      puts e
      exit
    end
  end
  status_thread = Process.detach(@pid) # so if the child exits, it dies

  Signal.trap("INT") do  # INT = control-C
    stop # first stop the child
    exit
  end

  begin
    sleep 2
  rescue Interrupt => e
    # in case someone hits control-C immediately
    stop
    exit
  end

  if exit?
    status = status_thread.value
    if status.success?
      notify "succeeded", ""
    else
      notify "failed", "Exit status #{status.exitstatus}"
    end
  else
    if !running?
      notify "Launch Failed", "See console for error output"
      @already_running = false
    end
  end

  unless @watcher
    watcher_class = osx_foundation? ? OSXWatcher : FSWatcher
    # watcher_class = FSWatcher

    watcher = watcher_class.new do
      restart unless @restarting
    end
    say "Watching #{dir}/#{pattern}"
    watcher.add_directory(dir, pattern)
    watcher.sleep_time = 1
    watcher.start
    @watcher = watcher
  end

end

#stop ⇒ Object 



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# File 'lib/rerun/runner.rb', line 127

def stop
  if @pid && (@pid != 0)
    notify "stopped", "All good things must come to an end." unless @restarting
    signal("KILL") && Process.wait(@pid)
  end
rescue => e
  false
end