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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 <iostream>
#include <boost/filesystem.hpp>
#include <boost/optional.hpp>
#include <boost/foreach.hpp>
#include "raw_convert.h"
class ImageFilenameSorter
{
public:
bool operator() (boost::filesystem::path a, boost::filesystem::path b)
{
std::list<int> na = extract_numbers (a);
std::list<int> nb = extract_numbers (b);
if (na.empty() || nb.empty()) {
return a.string() < b.string();
}
if (na.size() != nb.size()) {
/* Just use the first one */
return na.front() < nb.front();
}
std::list<int>::const_iterator i = na.begin ();
std::list<int>::const_iterator j = nb.begin ();
while (i != na.end()) {
if (*i != *j) {
return *i < *j;
}
++i;
++j;
}
/* All the same */
return false;
}
private:
std::list<int> extract_numbers (boost::filesystem::path p)
{
p = p.leaf ();
std::list<std::string> numbers;
std::string current;
for (size_t i = 0; i < p.string().size(); ++i) {
if (isdigit (p.string()[i])) {
current += p.string()[i];
} else {
if (!current.empty ()) {
numbers.push_back (current);
current.clear ();
}
}
}
if (!current.empty ()) {
numbers.push_back (current);
}
std::list<int> numbers_as_int;
BOOST_FOREACH (std::string i, numbers) {
numbers_as_int.push_back (raw_convert<int> (i));
}
return numbers_as_int;
}
};
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