448         a.pop()

   448         a.pop()

   449         b.pop()

   449         b.pop()

   450     b.reverse()

   450     b.reverse()

   451     return os.sep.join((['..'] * len(a)) + b) or '.'

   451     return os.sep.join((['..'] * len(a)) + b) or '.'

   452 

   452 

   455 def mainfrozen():

   453 def mainfrozen():

   456     """return True if we are a frozen executable.

   454     """return True if we are a frozen executable.

   457 

   455 

   458     The code supports py2exe (most common, Windows only) and tools/freeze

   456     The code supports py2exe (most common, Windows only) and tools/freeze

   459     (portable, not much used).

   457     (portable, not much used).

   460     """

   458     """

   461     return (safehasattr(sys, "frozen") or # new py2exe

   459     return (safehasattr(sys, "frozen") or # new py2exe

   462             safehasattr(sys, "importers") or # old py2exe

   460             safehasattr(sys, "importers") or # old py2exe

   463             imp.is_frozen("__main__")) # tools/freeze

   461             imp.is_frozen("__main__")) # tools/freeze

   464 

   464 

   465 def hgexecutable():

   465 def hgexecutable():

   466     """return location of the 'hg' executable.

   466     """return location of the 'hg' executable.

   467 

   467 

   468     Defaults to $HG or 'hg' in the search path.

   468     Defaults to $HG or 'hg' in the search path.