## Copyright (C) 2013 Michael D. Godfrey
##
## 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} {} printd (@var{obj}, @var{filename})
## @deftypefnx {Function File} {@var{out_file} =} printd (@dots{})
##
## Convert any object acceptable to @code{disp} into the format
## selected by the suffix of @var{filename}.  If the return argument
## @var{out_file} is given, the name of the created file is returned.
##
## This function is intended to facilitate manipulation of the output
## of functions such as @code{stemleaf}.
## @seealso{stemleaf}
## @end deftypefn

## Author: Michael D. Godfrey <michaeldgodfrey@gmail.com>
## Description: Convert objects into other file formats.

function pr_out = printd (obj, filename)
  ## Convert any object acceptable to disp() into various display formats.
  ## obj is the input object.
  ## filename is the output file (with required suffix).

  ## Extract .suffix from filename
  if ((sufix = rindex (filename, ".")) <= 0)
    error ("The output filename: %s requires a suffix.\nOptions are: pdf ps eps txt jpg jpeg", filename);
  endif
  opt = substr (filename, sufix+1);
  [pf, tempf, mag] = mkstemp ("oct-XXXXXX", 1);  # Safe version of tmpnam()
  fprintf (pf, "%s", disp (obj));
  frewind (pf);

  ## It seems best to only use convert for image output.  Its ps and pdf
  ## are badly rendered.
  opt = lower (opt);
  switch (opt)
    case {"pdf"}
      enscr = sprintf (
                       "enscript --no-header -o %s.ps %s ; ps2pdf %s.ps %s.pdf; mv %s.pdf %s;exit",...
                       tempf, tempf, tempf, tempf, tempf, filename);
      system (enscr);
      delete ([tempf ".ps"]);
    case {"ps"}
      enscr = sprintf ("enscript --no-header -o %s %s ; exit", filename, tempf);
      system (enscr);
    case {"eps"}
      enscr = sprintf (
                       "enscript --no-header -o %s.ps %s ; ps2eps --ignoreBB %s.ps; mv %s.eps %s; exit",...
                       tempf, tempf, tempf, tempf, filename);
      system (enscr);
      delete ([tempf ".ps"]);
    case {"txt"}
      enscr = sprintf ("cp %s %s", tempf, filename);
      system (enscr);
    case {"jpg" "jpeg"}
      enscr = sprintf ("convert -trim txt:%s  jpg:%s", tempf, filename);
      system (enscr);
    otherwise
      fclose (pf);
      delete (tempf);
      error ("Unknown conversion type: %s.\nOptions are: pdf ps eps txt jpg jpeg", opt);

  endswitch
  fclose (pf);
  delete (tempf);
  pr_out =  sprintf ("%s file %s written\n", opt, filename);
endfunction


%!demo
%! r2 = char (
%! 'stem step: 10, data: unsorted.',
%! 'Hinges:    lo: 12, hi: 42'     ,
%! '   1 | 22118'                  ,
%! '   2 | 28'                     ,
%! '   3 | 98'                     ,
%! '   4 | 244'                    ,
%! '   5 | 2'                      );
%! printd (r2, 'test_p.txt');
%! system ('cat test_p.txt');
%! delete ('test_p.txt');

%!test
%! r2 = char (
%! "stem step: 10, data: unsorted.",
%! "Hinges:    lo: 12, hi: 42"     ,
%! "   1 | 22118"                  ,
%! "   2 | 28"                     ,
%! "   3 | 98"                     ,
%! "   4 | 244"                    ,
%! "   5 | 2"                      );
%! printd (r2, "test_p.txt");
%! r4 = fileread ("test_p.txt");
%! delete ("test_p.txt");
%! r2 = disp (r2);
%! assert (r4, r2);

