text: VERSION = __version__ = (0, 1, 12, 'alpha', 0)
  __author__ = 'sax'
  
  import subprocess
  import datetime
  import os
  
  
  def get_version(version=None):
      """Derives a PEP386-compliant version number from VERSION."""
      if version is None:
          version = VERSION
      assert len(version) == 5
      assert version[3] in ('alpha', 'beta', 'rc', 'final')
  
      parts = 2 if version[2] == 0 else 3
      main = '.'.join(str(x) for x in version[:parts])
  
      sub = ''
      if version[3] == 'alpha' and version[4] == 0:
          git_changeset = get_git_changeset()
          if git_changeset:
              sub = '.dev%s' % git_changeset
  
      elif version[3] != 'final':
          mapping = {'alpha': 'a', 'beta': 'b', 'rc': 'c'}
          sub = mapping[version[3]] + str(version[4])
  
      return main + sub
  
  
  def get_git_changeset():
      """Returns a numeric identifier of the latest git changeset.
  
  The result is the UTC timestamp of the changeset in YYYYMMDDHHMMSS format.
  This value isn't guaranteed to be unique, but collisions are very unlikely,
  so it's sufficient for generating the development version numbers.
  """
      repo_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
      git_log = subprocess.Popen('git log --pretty=format:%ct --quiet -1 HEAD',
          stdout=subprocess.PIPE, stderr=subprocess.PIPE,
          shell=True, cwd=repo_dir, universal_newlines=True)
      timestamp = git_log.communicate()[0]
      try:
          timestamp = datetime.datetime.utcfromtimestamp(int(timestamp))
      except ValueError:
          return None
      return timestamp.strftime('%Y%m%d%H%M%S')
  
  
  
  