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annotate scripts/miscellaneous/private/tar_is_bsd.m @ 28921:967cfcde2e35

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maint: Use parentheses around conditional expressions. * memory.m, tar_is_bsd.m, runge_kutta_23s.m, load_packages_and_dependencies.m, unload_packages.m, camlookat.m, camorbit.m, __unite_shared_vertices__.m, streamribbon.m, struct2hdl.m, __alltohandles__.m, webwrite.m: Use parentheses around conditional expressions
author Rik <rik@octave.org>
date Tue, 13 Oct 2020 23:26:17 -0700
parents bd51beb6205e
children 6e460773bdda
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 ########################################################################
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2 ##
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3 ## Copyright (C) 2019-2020 The Octave Project Developers
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4 ##
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5 ## See the file COPYRIGHT.md in the top-level directory of this
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6 ## distribution or <https://octave.org/copyright/>.
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7 ##
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8 ## This file is part of Octave.
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9 ##
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10 ## Octave is free software: you can redistribute it and/or modify it
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11 ## under the terms of the GNU General Public License as published by
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12 ## the Free Software Foundation, either version 3 of the License, or
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13 ## (at your option) any later version.
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14 ##
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15 ## Octave is distributed in the hope that it will be useful, but
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16 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ## GNU General Public License for more details.
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19 ##
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20 ## You should have received a copy of the GNU General Public License
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21 ## along with Octave; see the file COPYING. If not, see
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22 ## <https://www.gnu.org/licenses/>.
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23 ##
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24 ########################################################################
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25
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26 ## -*- texinfo -*-
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27 ## @deftypefn {} {@var{out} =} tar_is_bsd ()
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28 ## True if the default tar command is BSD tar.
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29 ##
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30 ## Checks whether the default tar command (the one invoked when an un-prefixed
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31 ## @code{tar} is executed) is BSD tar or another tar. Caches the results for
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32 ## performance.
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33 ##
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34 ## Returns true if the detected tar is BSD tar, and false otherwise. Errors if
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35 ## @code{tar --version} does not succeed.
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36 ## @end deftypefn
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37
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38 function out = tar_is_bsd ()
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39 ## BSD tar needs to be handled differently from GNU tar
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40 persistent cache
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41 if (isempty (cache))
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42 [status, tar_ver_str] = system ("tar --version");
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43 if (status)
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44 error ("tar: Failed executing tar --version (status = %d)", status);
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45 endif
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46 cache = ! isempty (regexp (tar_ver_str, "bsdtar"));
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47 endif
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48 out = cache;
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49 endfunction