File: history.h

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/*****************************************************************************
 *  $Id: history.h,v 1.11 2002/08/17 13:19:31 mishoo Exp $
 *  Copyright (C) 2000, Mishoo
 *  Author: Mihai Bazon                  Email: mishoo@fenrir.infoiasi.ro
 *
 *   Distributed under the terms of the GNU General Public License. You are
 *  free to use/modify/distribute this program as long as you comply to the
 *    terms of the GNU General Public License, version 2 or above, at your
 *      option, and provided that this copyright notice remains intact.
 *****************************************************************************/


#ifndef __HISTORY_H__
#define __HISTORY_H__

#include <vector>
#include <string>
using namespace std;

class HistoryFile
{
 protected:
  int m_file_entries;
  string m_filename;
  string m_default;
  bool m_default_set;
  int m_current;

  typedef vector<string> StrArray;
  StrArray history;

 public:
  HistoryFile();
  ~HistoryFile();

  void append(const char *entry);
  void set_default(const char *defstr);
  void clear_default();

  void reset_position();

  const char * operator [] (size_t index);

  const char * prev();
  const char * next();

  const char * prev_to_first();
  const char * next_to_last();

  void sync_the_file();

  inline const char* last_item() {
    return history.empty() ? 0 : history.back().c_str();
  }

  inline const char* first_item() {
    return history.empty() ? 0 : history.front().c_str();
  }

 protected:
  void read_the_file();
 private:
  struct DumpString {
    DumpString(std::ostream& o) : _out(o) {}
    void operator()(std::string& str) { _out << str << endl; }
  private:
    std::ostream& _out;
  };
};

#endif // __HISTORY_H__