## Copyright (C) 1999-2012 Daniel Heiserer
## Copyright (C) 2001 Laurent Mazet
##
## 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} {} __gnuplot_print__ (@var{@dots{}})
## Undocumented internal function.
## @end deftypefn

## Author: Daniel Heiserer <Daniel.heiserer@physik.tu-muenchen.de>
## Adapted-By: jwe

function opts = __gnuplot_print__ (opts)

  dos_shell = (ispc () && ! isunix ());

  if (isempty (opts.fontsize))
    ## If no fontsize, determine the nominal axes fontsize.
    defaultfontsize = get (0, "defaultaxesfontsize");
    axesfontsize = get (findobj (opts.figure, "type", "axes"), "fontsize");
    if (iscell (axesfontsize))
      axesfontsize = round (median (cell2mat (axesfontsize)));
    endif
    if (isempty (axesfontsize))
      opts.fontsize = defaultfontsize;
    else
      opts.fontsize = axesfontsize;
    endif
  endif
  ## The axes-label and tick-label spacing is determined by
  ## the font spec given in "set terminal ..."
  gp_opts = font_spec (opts);

  pipeline = "";

  switch (lower (opts.devopt))
  case {"eps", "eps2", "epsc", "epsc2"}
    if (any (strcmp (opts.devopt, {"eps", "epsc"})))
      gp_opts = [gp_opts " level1"];
    endif
    if (opts.tight_flag || ! isempty (opts.preview))
      tmp_file = strcat (tmpnam (), ".eps");
      eps_drawnow (opts, tmp_file, gp_opts);
      if (dos_shell)
        cleanup = [" & del " strrep(tmp_file, '/', '\')];
      else
        cleanup = [" ; rm " tmp_file];
      endif
      pipeline = {sprintf("%s %s",
                          opts.epstool_cmd (opts, tmp_file, opts.name),
                          cleanup)};
    else
      eps_drawnow (opts, opts.name, gp_opts);
    endif
  case {"epslatex", "pslatex", "pstex", "epslatexstandalone"}
    dot = find (opts.name == ".", 1, "last");
    n = find (opts.devopt == "l", 1);
    suffix = opts.devopt(1:n-1);
    if (! isempty (dot))
      if (any (strcmpi (opts.name(dot:end), {strcat(".", suffix), ".tex", "."})))
        name = opts.name(1:dot-1);
      else
        error ("print:invalid-suffix", 
               "invalid suffix '%s' for device '%s'.",
               opts.name(dot:end), lower (opts.devopt));
      endif
    endif
    if (strfind (opts.devopt, "standalone"))
      term = sprintf ("%s ",
                      strrep (opts.devopt, "standalone", " standalone"));
    else
      term = sprintf ("%s ", opts.devopt);
    endif
    if (__gnuplot_has_feature__ ("epslatex_implies_eps_filesuffix"))
      suffix = "tex";
    else
      ## Gnuplot 4.0 wants a ".eps" suffix.
      suffix = "eps";
    endif
    local_drawnow ([term " " gp_opts],
                   strcat (name, ".", suffix), opts);
  case "tikz"
    if (__gnuplot_has_terminal__ ("tikz"))
      local_drawnow (["lua tikz " gp_opts], opts.name, opts);
    else
      error (sprintf ("print:no%soutput", opts.devopt),
             "print.m: '%s' output is not available for gnuplot-%s",
             upper (opts.devopt), __gnuplot_version__ ());
    endif
  case "svg"
    local_drawnow (["svg dynamic " gp_opts], opts.name, opts);
  case {"aifm", "corel", "eepic", "emf", "fig"}
    local_drawnow ([opts.devopt " " gp_opts], opts.name, opts);
  case {"pdfcairo", "pngcairo"}
    if (__gnuplot_has_terminal__ (opts.devopt))
      local_drawnow ([opts.devopt " " gp_opts], opts.name, opts);
    else
      error (sprintf ("print:no%soutput", opts.devopt),
             "print.m: '%s' output is not available for gnuplot-%s",
             upper (opts.devopt), __gnuplot_version__ ());
    endif
  case {"canvas", "dxf", "hpgl", "mf", "gif", "pstricks", "texdraw"}
    local_drawnow ([opts.devopt " " gp_opts], opts.name, opts);
  case opts.ghostscript.device
    gp_opts = font_spec (opts, "devopt", "eps");
    opts.ghostscript.output = opts.name;
    opts.ghostscript.source = strcat (tmpnam (), ".eps");
    eps_drawnow (opts, opts.ghostscript.source, gp_opts);
    [cmd_gs, cmd_cleanup] = __ghostscript__ (opts.ghostscript);
    if (opts.send_to_printer || isempty (opts.name))
      cmd_lpr = opts.lpr_cmd (opts);
      cmd = [cmd_gs " | " cmd_lpr];
    else
      cmd = cmd_gs;
    endif
    if (dos_shell)
      cmd = sprintf ("%s & del %s", cmd, strrep (opts.ghostscript.source, '/', '\'));
    else
      cmd = sprintf ("%s ; rm %s", cmd, opts.ghostscript.source);
    endif
    if (! isempty (cmd_cleanup))
      if (dos_shell)
        pipeline = {[cmd " & " cmd_cleanup]};
      else
        pipeline = {[cmd " ; " cmd_cleanup]};
      endif
    else
      pipeline = {cmd};
    endif
  otherwise
    error (sprintf ("print:no%soutput", opts.devopt),
           "print.m: %s output is not available for the Gnuplot graphics toolkit",
           upper (opts.devopt));
  endswitch


  opts.pipeline = pipeline;

  for n = 1:numel (pipeline)
    if (opts.debug)
      fprintf ("gnuplot-pipeline: '%s'\n", pipeline{n});
    endif
    [status, output] = system (pipeline{n});
    if (status)
      fprintf ("%s\n%s\n%s\n",
               "---------- output begin ----------",
               output,
               "----------- output end -----------");
      error ("gnuplot:failedpipe", "print: failed to print");
    endif
  endfor

endfunction

function eps_drawnow (opts, epsfile, gp_opts)
  [h, fontsize] = get_figure_text_objs (opts);
  unwind_protect
    fontsize_2x = cellfun (@(x) 2*x, fontsize, "uniformoutput", false);
    set (h, {"fontsize"}, fontsize_2x);
    local_drawnow (["postscript eps " gp_opts], epsfile, opts);
  unwind_protect_cleanup
    set (h, {"fontsize"}, fontsize);
  end_unwind_protect
endfunction

function local_drawnow (term, file, opts)
  if (opts.use_color < 0)
    mono = true;
  else
    mono = false;
  endif
  figure (opts.figure);
  if (isempty (opts.debug_file) || ! opts.debug)
    drawnow (term, file, mono);
  else
    drawnow (term, file, mono, opts.debug_file);
  endif
endfunction

function f = font_spec (opts, varargin)
  for n = 1:2:numel (varargin)
    opts.(varargin{n}) = varargin{n+1};
  endfor
  f = "";
  switch (opts.devopt)
  case "cgm"
    if (! isempty (opts.font) && ! isempty (opts.fontsize))
      f = sprintf ('font "%s,%d"', opts.font, opts.fontsize);
    elseif (! isempty (opts.font))
      f = sprintf ('font "%s"', opts.font);
    elseif (! isempty (opts.fontsize))
      f = sprintf ("%d", opts.fontsize);
    endif
  case {"eps", "eps2", "epsc", "epsc2"}
    ## Gnuplot renders fonts as half their specification, which
    ## results in a tight spacing for the axes-labels and tick-labels.
    ## Compensate for the half scale. This will produce the proper
    ## spacing for the requested fontsize.
    if (! isempty (opts.font) && ! isempty (opts.fontsize))
      f = sprintf ('font "%s,%d"', opts.font, 2 * opts.fontsize);
    elseif (! isempty (opts.font))
      f = sprintf ('font "%s"', opts.font);
    elseif (! isempty (opts.fontsize))
      f = sprintf ("%d", 2 * opts.fontsize);
    endif
  case "svg"
    if (! isempty (opts.font) && ! isempty (opts.fontsize))
      fontsize = round (opts.fontsize * 0.75);
      f = sprintf ('fname "%s" fsize %d', opts.font, fontsize);
    elseif (! isempty (opts.font))
      f = sprintf ('fname "%s"', opts.font);
    elseif (! isempty (opts.fontsize))
      fontsize = round (opts.fontsize * 0.75);
      f = sprintf ("%s fsize %d", f, fontsize);
    endif
  case "pdf"
    if (! isempty (opts.font) && ! isempty (opts.fontsize))
      f = sprintf ('font "%s,%d"', opts.font, opts.fontsize);
    elseif (! isempty (opts.font))
      f = sprintf ('font "%s"', opts.font);
    elseif (! isempty (opts.fontsize))
      f = sprintf ("fsize %d", f, opts.fontsize);
    endif
  case {"pdfcairo", "pngcairo"}
    if (! isempty (opts.font))
      f = sprintf ('font "%s"', opts.font);
    endif
  case {"epslatex", "epslatexstandalone"}
    if (! isempty (opts.font) && ! isempty (opts.fontsize))
      f = sprintf ('font "%s,%d"', opts.font, opts.fontsize);
    elseif (! isempty (opts.font))
      f = sprintf ('font "%s"', opts.font);
    elseif (! isempty (opts.fontsize))
      f = sprintf ("%d", opts.fontsize);
    endif
  case "pslatex"
    if (! isempty (opts.fontsize))
      f = sprintf ("%d", opts.fontsize);
    endif
  case {"gif", "jpeg", "png"}
    if (! isempty (opts.font) && ! isempty (opts.fontsize))
      f = sprintf ('font "%s ,%d"', opts.font, opts.fontsize);
    elseif (! isempty (opts.font))
      f = sprintf ('font "%s"', opts.font);
    elseif (! isempty (opts.fontsize))
      f = sprintf ('font "%d"', opts.fontsize);
    endif
  case "emf"
    if (! isempty (opts.font) && ! isempty (opts.fontsize))
      f = sprintf ('"%s" %d', opts.font, opts.fontsize);
    elseif (! isempty (opts.font))
      f = sprintf ('"%s"', opts.font);
    elseif (! isempty (opts.fontsize))
      f = sprintf ("%d", opts.fontsize);
    endif
  case "canvas"
    if (! isempty (opts.fontsize))
      f = sprintf ("fsize %d", opts.fontsize);
    endif
  case {"aifm", "corel"}
    if (! isempty (opts.font) && ! isempty (opts.fontsize))
      f = sprintf ("%s %d", opts.font, opts.fontsize);
    elseif (! isempty (opts.font))
      f = sprintf ("%s", opts.font);
    elseif (! isempty (opts.fontsize))
      f = sprintf ("%d", opts.fontsize);
    endif
  case "fig"
    if (! isempty (opts.font) && ! isempty (opts.fontsize))
      f = sprintf ("font %s fontsize %d", opts.font, opts.fontsize);
    elseif (! isempty (opts.font))
      f = sprintf ("font %s", opts.font);
    elseif (! isempty (opts.fontsize))
      f = sprintf ("fontsize %d", opts.fontsize);
    endif
  endswitch
endfunction

function [h, fontsize] = get_figure_text_objs (opts)
  h = findall (opts.figure, "-property", "fontsize");
  fontsize = get (h, "fontsize");
  switch (numel (fontsize))
  case 0
    fontsize = {};
  case 1
    fontsize = {fontsize};
  endswitch
endfunction