update packages

[CreaPhase.git] / octave_packages / m / plot / private / __gnuplot_version__.m

diff --git a/octave_packages/m/plot/private/__gnuplot_version__.m b/octave_packages/m/plot/private/__gnuplot_version__.m
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+## Copyright (C) 2006-2012 Daniel Sebald
+##
+## 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} {@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, actually take the advice it gives, and stop
+      ## asking us why plotting fails when gnuplot is not found.
+      error ("you must have gnuplot installed to display graphics; if you have gnuplot installed in a non-standard location, see the 'gnuplot_binary' function\n");
+    endif
+    output = strrep (output, "gnuplot", "");
+    output = strrep (output, "patchlevel", ".");
+    output = strrep (output, "\n", "");
+    output = strrep (output, "\r", "");
+    __version__ = strrep (output, " ", "");
+  endif
+
+  version = __version__;
+
+endfunction
+