// join two path segments cleanly together
// but only if right side is not absolute yet
std::string join_paths(std::string l, std::string r)
{
#ifdef _WIN32
// convert Windows backslashes to URL forward slashes
replace(l.begin(), l.end(), '\\', '/');
replace(r.begin(), r.end(), '\\', '/');
#endif
if (l.empty()) return r;
if (r.empty()) return l;
if (is_absolute_path(r)) return r;
if (l[l.length()-1] != '/') l += '/';
while ((r.length() > 3) && ((r.substr(0, 3) == "../") || (r.substr(0, 3)) == "..\\")) {
size_t L = l.length(), pos = find_last_folder_separator(l, L - 2);
bool is_slash = pos + 2 == L && (l[pos+1] == '/' || l[pos+1] == '\\');
bool is_self = pos + 3 == L && (l[pos+1] == '.');
if (!is_self && !is_slash) r = r.substr(3);
l = l.substr(0, pos == std::string::npos ? pos : pos + 1);
}
return l + r;
}
// return only the filename part of path
std::string base_name(const std::string& path)
{
size_t pos = find_last_folder_separator(path);
if (pos == std::string::npos) return path;
else return path.substr(pos+1);
}
