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/*
Copyright (C) 2015 Carl Hetherington <cth@carlh.net>
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "raw_convert.h"
#include <boost/filesystem.hpp>
#include <boost/optional.hpp>
#include <iostream>
class ImageFilenameSorter
{
public:
bool operator() (boost::filesystem::path a, boost::filesystem::path b)
{
boost::optional<int> na = extract_number (a);
boost::optional<int> nb = extract_number (b);
if (!na || !nb) {
return a.string() < b.string();
}
return na.get() < nb.get();
}
private:
boost::optional<int> extract_number (boost::filesystem::path p)
{
p = p.leaf ();
std::string number;
for (size_t i = 0; i < p.string().size(); ++i) {
if (isdigit (p.string()[i])) {
number += p.string()[i];
} else {
if (!number.empty ()) {
break;
}
}
}
if (number.empty ()) {
return boost::optional<int> ();
}
return raw_convert<int> (number);
}
};
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