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########################################################################
##
## Copyright (C) 2006-2024 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{version} =} __gnuplot_version__ ()
## Undocumented internal function.
## @end deftypefn
## Return the version of gnuplot we are using. Note that we do not
## attempt to handle the case of the user switching to different
## versions of gnuplot during the same session.
function version = __gnuplot_version__ ()
persistent __version__ = "";
if (isempty (__version__))
[status, output] = system (sprintf ('"%s" --version', gnuplot_binary ()));
if (status != 0)
## This message ends in a newline so that the traceback messages
## are skipped and people might actually see the message, read it,
## comprehend it, take the advice it gives, and stop asking us
## why plotting fails when gnuplot is not found.
error ("The gnuplot executable '%s' was not found or does not work. If you have gnuplot installed in a non-standard location, see the 'gnuplot_binary' function\n", gnuplot_binary ());
endif
output = strrep (output, "gnuplot", "");
output = strrep (output, "patchlevel", ".");
output = strrep (output, "\n", "");
output = strrep (output, "\r", "");
__version__ = strrep (output, " ", "");
endif
version = __version__;
endfunction
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