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  The purpose of this routine is to extract from a long file path, the
  base or root file name. That is, the name of the actual file without
  the preceeding directory information or the final file extension.
  The directory information and file extension can be obtained via
  keywords. It is similar to File_Basename in IDL.




      The base or root file name is returned. This is the "name" of the file
      without either the preceeding directory information, or the prepended
      file extension.


    filename: in, required, type=string
        This file name to be parsed. It may be a relative or absolute path
        name to a file.


    directory: out, optional, type=string
        The name of the directory preceeding the root file name. If the file name
        contains no directory information, this keyword is set equal to the current
        working directory at the time the program is called.
    extension: out, optional, type=string
        The (usually!) three character file extention of the file.
    path_separator: in, optional, type=string
        The string to use as a path separator in parsing the file. If undefined
        the out of Path_Sep() is used.


    Print, the root name, directory, and extension of a file::
      IDL> thePath = "C:\rsi\idl7.8\lib\jester.pro"
      IDL> Print, cgRootName(thePath, Directory=theDirectory, Extension=theExtension)
      IDL> Print, theDirectory
      IDL> Print, theExtension
    Get the name of the current directory, with the path separator as the last character. This is
    the equivalent of CD, Current=current & current = current + Path_Sep().
      IDL> void = cgRootName(Directory=current)
      IDL> Print, current


      David W. Fanning
      1645 Sheely Drive
      Fort Collins, CO 80526 USA
      Phone: 970-221-0438
      E-mail: david@idlcoyote.com
      Coyote's Guide to IDL Programming: http://www.idlcoyote.com


    Change History::
        Written by: David W. Fanning, 31 July 2003.
        Modified by KaRo, 13 Feb. 2005 to allow dots in the filename.
        Added PATH_SEPARATOR keyword. 25 July 2005. DWF.
        Added ability to recongnize directory by path separator in last character. 19 Sept 2005. DWF.
        If directory is blank (because a relative filename was passed), set to current directory. 6 Aug 2009. DWF.
        There were a couple of instances where the directory did NOT end in a path separator. Fixed. 24 Feb 2012. DWF.
        Added ability to get the current directory with a path separator in one step instead of two. See example
          section for details. 26 Sept 2013. DWF.


    Copyright (c) 2003-2012, Fanning Software Consulting, Inc.

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