## Copyright (C) 2010-2011 Kai Habel
##
## 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} {} __fltk_file_filter__ (@var{file_filter})
## Undocumented internal function.
## @end deftypefn

## Author: Kai Habel

function retval = __fltk_file_filter__ (file_filter)
  # converts octave's file filter format into fltk's.
  retval = "";
  if (iscell (file_filter))
    [r, c] = size (file_filter);
    if ((c == 0) || (c > 2))
      error ("expecting 1 or to 2 columns for file filter cell.");
    endif
    fltk_str = "";
    for idx = 1 : r

      curr_ext = file_filter{idx, 1};                    
      curr_ext = strsplit (curr_ext, ";");

      if (length (curr_ext) > 1)
        curr_ext = regexprep (curr_ext, '\*\.', ',');
        curr_ext = strcat (curr_ext{:})(2 : end);
        curr_ext = strcat ("*.{", curr_ext, "}");
      else
        curr_ext = curr_ext{:};
      endif

      curr_desc = strcat (curr_ext(3:end), "-Files");

      if (c == 2)
        curr_desc = file_filter{idx, 2};
        curr_desc = regexprep (curr_desc, '\(', '<');
        curr_desc = regexprep (curr_desc, '\)', '>');
      endif

      if (length (fltk_str) > 0)
        fltk_str = strcat (fltk_str, "\t", curr_desc, " (", curr_ext, ")");
      else
        fltk_str = strcat (curr_desc, " (", curr_ext, ")");
      endif

    endfor
    retval = fltk_str;
  elseif (ischar (file_filter))
    if (!isdir (file_filter))
      [fdir, fname, fext] = fileparts (file_filter);
      if (length (fext) > 0)
        retval = strcat ("*", fext, "\t*");
      endif
    endif
  endif  
endfunction