## Copyright (C) 2004-2018 Alois Schloegl
##
## 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
## <https://www.gnu.org/licenses/>.

## -*- texinfo -*-
## @deftypefn {} {} isfolder (@var{f})
## @deftypefnx {} {@var{tf} =} isfolder (@var{f})
## Return true if @var{f} is a directory and false otherwise.
## If @var{f} is a cell array of strings, @var{tf} is a logical array of the 
## same size.
## @seealso{exist, stat, is_absolute_filename, is_rooted_relative_filename}
## @end deftypefn

function retval = isfolder (f)

  if (nargin != 1 || ! (ischar (f) || iscellstr (f)))
    print_usage ();
  endif

  f = cellstr (f);
  retval = false (size (f));
  for i = 1:numel (f)
    retval(i) = (exist (f{i}, "dir") == 7);
  endfor

endfunction


%!assert (isfolder (pwd ()))
%!assert (! isfolder ( tempname ()))
%!assert (isfolder ( {pwd(), tempname()}), [true, false])
%!assert (isfolder ( {pwd(); tempname()}), [true; false])

%!error isfolder ()
%!error isfolder (1)
%!error isfolder (1, 2)
