old_contents: #!/usr/bin/env python
  #
  # Test hook to launch an irker instance (if it doesn't already exist)
  # just before shipping the notification. We start it in in another terminal
  # so you can watch the debug messages. Probably only of interest only to
  # developers
  #
  # To use it, set up irkerhook.py to file on each commit.
  # Then set the filtercmd variable in your repo config as follows:
  # 
  # [irker]
  # 	filtercmd = filter-test.py
  #
  # This is rather antisocial - imagine thousands of irkerds holding open
  # connections to IRCDs.  It's better to go through an instance running
  # at your forge or set up for shared use by your intranet administrator.
  
  import os, sys, json, subprocess, time
  metadata = json.loads(sys.argv[1])
  
  ps = subprocess.Popen("ps -U %s uh" % os.getenv("LOGNAME"),
                        shell=True,
                        stdout=subprocess.PIPE)
  data = ps.stdout.read()
  irkerd_count = len([x for x in data.split("\n") if x.find("irkerd") != -1])
  
  if not irkerd_count:
      os.system("gnome-terminal --title 'irkerd' -e 'irkerd -d 2' &")
  
  time.sleep(0.1)	# Avoid a race condition
  
  print json.dumps(metadata)
  # end
  
new_contents: #!/usr/bin/env python
  #
  # Test hook to launch an irker instance (if it doesn't already exist)
  # just before shipping the notification. We start it in in another terminal
  # so you can watch the debug messages. Intended to be used in the root
  # directory of the irker repo. Probably only of interest only to irker
  # developers
  #
  # To use this, set up irkerhook.py to fire on each commit.  Creating a
  # .git/hooks/post-commit file containing the line "irkerhook.py"; be
  # sure to make the opos-commit file executable.  Then set the
  # filtercmd variable in your repo config as follows:
  # 
  # [irker]
  # 	filtercmd = filter-test.py
  
  import os, sys, json, subprocess, time
  metadata = json.loads(sys.argv[1])
  
  ps = subprocess.Popen("ps -U %s uh" % os.getenv("LOGNAME"),
                        shell=True,
                        stdout=subprocess.PIPE)
  data = ps.stdout.read()
  irkerd_count = len([x for x in data.split("\n") if x.find("irkerd") != -1])
  
  if not irkerd_count:
      os.system("gnome-terminal --title 'irkerd' -e 'irkerd -d 2' &")
  
  time.sleep(0.1)	# Avoid a race condition
  
  print json.dumps(metadata)
  # end
  
subject: Document the test filter better.