import os
import stat
import time
import unittest
import string

filesToWatch = ('dbi.py', 'dbiq.py', 'test_dbi.py', 'test_dbiq.py')
accessTime = {}
testDrivers = ('test_dbi.py', 'test_dbiq.py')

def AnyFilesChanged():
  changed = False
  for fileName in filesToWatch:
    try:
      st = os.stat(fileName)
    except os.error:
      continue

    if fileName not in accessTime or st[stat.ST_MTIME] > accessTime[fileName]:
      accessTime[fileName] = st[stat.ST_MTIME]
      changed = True
      print '[%s changed at %s]' % (fileName, st[stat.ST_MTIME])

  return changed 

def RunTests(driver):
  program = 'python'
  args = (driver,)

  print '[', driver, ']'

  # find executable
  for path in string.split(os.environ["PATH"], os.pathsep):
    file = os.path.join(path, program)
    try:
      return os.spawnv(os.P_WAIT, file, (file,) + args)
    except os.error:
      pass
    raise os.error, "cannot find executable"

while(1):
  if AnyFilesChanged(): 
    for driver in testDrivers:
      RunTests(driver)
  time.sleep(0.10)