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/*
Copyright (C) 2015-2017 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic 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 2 of the License, or
(at your option) any later version.
DCP-o-matic 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 DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "image_filename_sorter.h"
#include <dcp/locale_convert.h>
#include <boost/filesystem.hpp>
#include <boost/foreach.hpp>
#include <boost/optional.hpp>
#include <iostream>
using std::list;
using std::string;
using dcp::locale_convert;
using boost::optional;
bool
ImageFilenameSorter::operator() (boost::filesystem::path a, boost::filesystem::path b)
{
optional<int> na = extract_numbers (a);
optional<int> nb = extract_numbers (b);
if (!na || !nb) {
return a.string() < b.string();
}
return *na < *nb;
}
optional<int>
ImageFilenameSorter::extract_numbers (boost::filesystem::path p)
{
string numbers;
string const ps = p.leaf().string();
for (size_t i = 0; i < ps.size(); ++i) {
if (isdigit (ps[i])) {
numbers += ps[i];
}
}
if (numbers.empty ()) {
return optional<int> ();
}
/* locale_convert is quicker than raw_convert and numbers can only contain
things which are isdigit() so locale_convert is fine to use.
*/
return locale_convert<int> (numbers);
}
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