watchr config file for Python based apps (Pyramid in my case). Simulates behavior of autotest in Ruby.

watchr_pyramid.rb

require 'rbconfig'

GREEN = 'green' unless defined?(GREEN)
RED   = 'red'   unless defined?(RED)

def set_state(condition)
  %x[echo #{condition} > ./.build_state]
end

def state_is?(condition)
  current_state == condition
end

def current_state
  %x[cat ./.build_state].chomp
end

def run_and_notify(cmd)
  output = %x[#{cmd}]
  if output =~ /FAILED \(errors=(\d+)\)/
    set_state(RED) if current_state == GREEN
    subject = "#{$1} FAILED TEST#{"S" unless $1 == 1}!"
    errors  = output.scan(/^(ERROR: .*)$/)
    desc    = "\n#{errors.join("\n")}"
    send_message(subject, desc, 'critical')
    print output.gsub(/^(writing|reading|running).*\n/, '')
  else
    set_state(GREEN) if current_state == RED
  end
end

def send_message(subject, desc='', priority='normal')
  os = RbConfig::CONFIG['host_os']
  if os =~ /linux/
    %x[notify-send --urgency=#{priority} '#{subject}' '#{desc}']
  elsif os =~ /mac|darwin/
    # growl support here
  else
    print "#{priority} : #{msg}"
  end
end

def sanity_check(file)
  beginning_state = current_state
  run_test(file)
  if beginning_state == RED and current_state == GREEN
    send_message "#{file} all green! Running all tests..."
    run_all_tests
    if current_state == GREEN
      send_message 'All fixed!', 'Good work!'
    end
  end
end    

def run_all_tests
  print "Running all tests..."
  $stdout.flush
  run_and_notify("python setup.py test -q 2>&1")
  puts "done"
end

def run_test(file)
  mod = file.gsub(/\//, '.').sub(/\.py$/, '')

  unless File.exist?(file)
    puts "ERROR: #{file} does not exist."
    return
  end

  print "Running #{file}..."
  $stdout.flush
  run_and_notify "python setup.py test -s #{mod} -q 2>&1"
  puts "done."
end

watch("run-all-tests.txt") do |match|
  run_all_tests
end

# Put your watch statements below
# Here is an example
watch("properflow/tests/.*\.py$") do |match|
  sanity_check match[0]
end