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########################################################################
##
## Copyright (C) 2008-2024 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## 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 {} {[@var{prog}, @var{args}] =} gnuplot_binary ()
## @deftypefnx {} {[@var{old_prog}, @var{old_args}] =} gnuplot_binary (@var{new_prog})
## @deftypefnx {} {[@var{old_prog}, @var{old_args}] =} gnuplot_binary (@var{new_prog}, @var{arg1}, @dots{})
## Query or set the name of the program invoked by the plot command when the
## graphics toolkit is set to @qcode{"gnuplot"}.
##
## Additional arguments to pass to the external plotting program may also be
## given. The default value is @qcode{"gnuplot"} with no additional arguments.
## @xref{Installation}.
## @seealso{graphics_toolkit}
## @end deftypefn
function [prog, args] = gnuplot_binary (new_prog, varargin)
mlock ();
persistent gp_binary = %OCTAVE_CONF_GNUPLOT%;
persistent gp_args = {};
if (nargout > 0 || nargin == 0)
prog = gp_binary;
args = gp_args;
endif
if (nargin > 0)
if (! ischar (new_prog) || isempty (new_prog))
error ("gnuplot_binary: NEW_PROG must be a non-empty string");
endif
gp_binary = new_prog;
gp_args = {};
endif
if (nargin > 1)
if (! iscellstr (varargin))
error ("gnuplot_binary: arguments must be character strings");
endif
gp_args = varargin;
endif
endfunction
%!test
%! [orig_val, orig_args] = gnuplot_binary ();
%! unwind_protect
%! [old_val, old_args] = gnuplot_binary ("__foobar__", "-opt1");
%! assert (orig_val, old_val);
%! assert (orig_args, old_args);
%! assert (gnuplot_binary (), "__foobar__");
%! [~, new_args] = gnuplot_binary ();
%! assert (new_args, {"-opt1"});
%! unwind_protect_cleanup
%! gnuplot_binary (orig_val, orig_args{:});
%! end_unwind_protect
%! assert (gnuplot_binary (), orig_val);
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