SPEC_DIR

     Complete a file specification by appending the default disk or directory

     File_spec = SPEC_DIR( filename, [ extension ] )

     filename - character string giving partial specification of a file
               name.  Examples for different operating systems include the
                       following:
               VMS: '$1$DUA5:TEST.DAT','[.SUB]TEST'
               Unix: 'pro/test.dat', '$IDL_HOME/test','~/subpro'
               MacOS: ':Programs:test'
               Windows: '\pro\test.dat','d:\pro\test'

     exten - string giving a default file name extension to be used if
             filename does not contain one.  Do not include the period.

     File_spec - Complete file specification using default disk or
               directory when necessary.

      IDL> a = spec_dir('test','dat')
      is equivalent to the commands
      IDL> cd, current=cdir
      IDL> a = cdir + delim + 'test.dat'
      where delim is the OS-dependent separator

      SPEC_DIR() decomposes the file name using FDECOMP, and appends the
      default directory (obtained from the CD command) if necessary.
      Under VMS, SPEC_DIR() will also try to translate disk and directory
      logical names.
      SPEC_DIR() does not check whether the constructed file name actually
      exists.

      EXPAND_TILDE(), FDECOMP

      Written W. Landsman         STX         July, 1987
      Added Unix compatibility, W.  Landsman, STX   August 1991
      Added Windows and Macintosh compatibility   W. Landsman  September, 1995
      Work for relative Unix directory            W. Landsman  May, 1997
      Expand Unix tilde if necessary              W. Landsman  September 1997
      Converted to IDL V5.0   W. Landsman   September 1997
      Fix VMS call to TRNLOG()  W. Landsman       September 2000

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