## Copyright (C) 2007-2013 David Bateman
##
## This file is part of Octave.
##
## Octave is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or (at
## your option) any later version.
##
## Octave is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING.  If not, see
## <http://www.gnu.org/licenses/>.

## -*- texinfo -*-
## @deftypefn  {Function File} {@var{entries} =} gzip (@var{files})
## @deftypefnx {Function File} {@var{entries} =} gzip (@var{files}, @var{outdir})
## Compress the list of files and/or directories specified in @var{files}.
## Each file is compressed separately and a new file with a @file{".gz"}
## extension is created.  The original files are not modified.  Existing
## compressed files are silently overwritten.  If @var{outdir} is defined the
## compressed files are placed in this directory.
## @seealso{gunzip, bzip2, zip, tar}
## @end deftypefn

function entries = gzip (varargin)
  if (nargin != 1 && nargin != 2) || (nargout > 1)
    print_usage ();
  endif

  if (nargout == 0)
    __xzip__ ("gzip", "gz", "gzip -r %s", varargin{:});
  else
    entries = __xzip__ ("gzip", "gz", "gzip -r %s", varargin{:});
  endif

endfunction


%!xtest
%! ## test gzip together with gunzip
%! unwind_protect
%!   filename = tmpnam;
%!   dummy    = 1;
%!   save (filename, "dummy");
%!   dirname  = tmpnam;
%!   mkdir (dirname);
%!   entry = gzip (filename, dirname);
%!   [path, basename, extension] = fileparts (filename);
%!   if (! strcmp (entry, [dirname, filesep, basename, extension, ".gz"]))
%!     error ("gzipped file does not match expected name!");
%!   endif
%!   if (! exist (entry, "file"))
%!     error ("gzipped file cannot be found!");
%!   endif
%!   gunzip (entry);
%!   fid = fopen (filename, "rb");
%!   assert (fid >= 0);
%!   orig_data = fread (fid);
%!   fclose (fid);
%!   fid = fopen ([dirname filesep basename extension], "rb");
%!   assert (fid >= 0);
%!   new_data = fread (fid);
%!   fclose (fid);
%!   if (orig_data != new_data)
%!     error ("unzipped file not equal to original file!");
%!   endif
%! unwind_protect_cleanup
%!   delete (filename);
%!   delete ([dirname, filesep, basename, extension]);
%!   rmdir (dirname);
%! end_unwind_protect

%!error gzip ()
%!error gzip ("1", "2", "3")
%!error <output directory does not exist> gzip ("1", tmpnam)
%!error <FILES must be a character array or cellstr> gzip (1)