Use xdg-open if present, instead of guessing firefox.

source/system/split_string.cpp

@@ -0,0 +1,32 @@
+#include "split_string.hpp"
+#include <string>
+#include <algorithm>
+#include <cstddef>
+
+namespace nana
+{
+namespace system {
+std::vector<split_string_type> split_string (const split_string_type& text, char sep)
+{
+	std::vector<split_string_type> retval;
+	const auto estimated_size = std::count(text.begin(), text.end(), sep) + 1;
+	retval.reserve(estimated_size);
+
+	std::size_t sep_pos = 0;
+	while (sep_pos != text.size()) {
+		const std::size_t start = sep_pos;
+		sep_pos = text.find(sep, sep_pos);
+		sep_pos = (text.npos == sep_pos ? text.size() : sep_pos);
+		const std::size_t end = sep_pos;
+		while (sep_pos < text.size() and sep == text[sep_pos]) {
+			++sep_pos;
+		}
+
+		retval.push_back(text.substr(start, end - start));
+	}
+
+	return retval;
+}
+
+}
+}