split majority of helpers and rewrite a few heinous functions

src/utility/comparators.h

@@ -0,0 +1,65 @@
+/***************************************************************************
+ *   Copyright (C) 2008-2012 by Andrzej Rybczak                            *
+ *   electricityispower@gmail.com                                          *
+ *                                                                         *
+ *   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.,                                       *
+ *   51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.              *
+ ***************************************************************************/
+
+#ifndef _UTILITY_COMPARATORS
+#define _UTILITY_COMPARATORS
+
+#include <string>
+#include "mpdpp.h"
+
+class CaseInsensitiveStringComparison
+{
+	bool hasTheWord(const std::string &s)
+	{
+		return  (s.length() > 3)
+		&&	(s[0] == 't' || s[0] == 'T')
+		&&	(s[1] == 'h' || s[1] == 'H')
+		&&	(s[2] == 'e' || s[2] == 'E')
+		&&	(s[3] == ' ');
+	}
+	
+public:
+	int operator()(const std::string &a, const std::string &b);
+};
+
+class CaseInsensitiveSorting
+{
+	CaseInsensitiveStringComparison cmp;
+	
+public:
+	bool operator()(const std::string &a, const std::string &b)
+	{
+		return cmp(a, b) < 0;
+	}
+	
+	bool operator()(const MPD::Song &a, const MPD::Song &b)
+	{
+		return cmp(a.getName(), b.getName()) < 0;
+	}
+	
+	template <typename A, typename B> bool operator()(const std::pair<A, B> &a, const std::pair<A, B> &b)
+	{
+		return cmp(a.first, b.first) < 0;
+	}
+	
+	bool operator()(const MPD::Item &a, const MPD::Item &b);
+};
+
+#endif // _UTILITY_COMPARATORS