Added option and flag parseing, now supports -p for port range.

git-svn-id: svn://rakshasa.no/libtorrent/trunk/rtorrent@287 e378c898-3ddf-0310-93e7-cc216c733640

src/option_parser.h

@@ -0,0 +1,39 @@
+#ifndef RTORRENT_OPTION_PARSER_H
+#define RTORRENT_OPTION_PARSER_H
+
+#include <map>
+#include <string>
+#include <sigc++/slot.h>
+
+// Throws std::runtime_error upon receiving bad input.
+
+class OptionParser {
+public:
+  typedef sigc::slot0<void>                     SlotFlag;
+  typedef sigc::slot1<void, const std::string&> SlotOption;
+  typedef sigc::slot2<void, int, int>           SlotIntPair;
+
+  struct Node {
+    SlotOption m_slot;
+    bool       m_useOption;
+  };
+
+  typedef std::map<char, Node>                  Container;
+
+  void        insert_flag(char c, SlotFlag s);
+  void        insert_option(char c, SlotOption s);
+
+  // Returns the index of the first non-option argument.
+  int         process(int argc, char** argv);
+
+  static void call_int_pair(const std::string& str, SlotIntPair slot);
+
+private:
+  std::string create_optstring();
+
+  void        call_flag(char c, const std::string& arg);
+
+  Container   m_container;
+};
+
+#endif