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########################################################################
##
## Copyright (C) 2005-2024 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{ver}, @var{url}] =} get_forge_pkg (@var{name})
## Try to discover the current version of an Octave Forge package from the web,
## using a working internet connection and the urlread function.
## If two output arguments are requested, also return an address from which
## to download the file.
## @end deftypefn
function [ver, url] = get_forge_pkg (name)
## Verify that name is valid.
if (! (ischar (name) && rows (name) == 1 && ndims (name) == 2))
error ("get_forge_pkg: package NAME must be a string");
elseif (! all (isalnum (name) | name == "-" | name == "." | name == "_"))
error ("get_forge_pkg: invalid package NAME: %s", name);
endif
name = lower (name);
## Try to download package's index page.
[html, succ] = urlread (sprintf ("https://packages.octave.org/%s/index.html", ...
name));
if (succ)
## Remove blanks for simpler matching.
html(isspace (html)) = [];
## Good. Let's grep for the version.
pat = "<tdclass=""package_table"">PackageVersion:</td><td>([\\d.]*)</td>";
t = regexp (html, pat, "tokens");
if (isempty (t) || isempty (t{1}))
error ("get_forge_pkg: could not read version number from package's page");
else
ver = t{1}{1};
if (nargout > 1)
## Build download string.
pkg_file = sprintf ("%s-%s.tar.gz", name, ver);
url = ["https://packages.octave.org/download/" pkg_file];
## Verify that the package string exists on the page.
if (isempty (strfind (html, pkg_file)))
warning ("get_forge_pkg: download URL not verified");
endif
endif
endif
else
## Try get the list of all packages.
[html, succ] = urlread ("https://packages.octave.org/list_packages.php");
if (! succ)
error ("get_forge_pkg: could not read URL, please verify internet connection");
endif
t = strsplit (html);
if (any (strcmp (t, name)))
error ("get_forge_pkg: package NAME exists, but index page not available");
endif
## Try a simplistic method to determine similar names.
function d = fdist (x)
len1 = length (name);
len2 = length (x);
if (len1 <= len2)
d = sum (abs (lower (name(1:len1)) - lower (x(1:len1)))) ...
+ (len2 - len1)*23;
else
d = sum (abs (lower (name(1:len2)) - lower (x(1:len2)))) ...
+ (len1 - len2)*23;
endif
endfunction
dist = cellfun ("fdist", t);
[~, i] = min (dist);
error ("get_forge_pkg: package not found: ""%s"". Did you mean ""%s""?", ...
name, t{i});
endif
endfunction
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