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/* omega.h: Main header for omega
 * Copyright 1999,2000,2001 BrightStation PLC
 * Copyright 2001 Lemur Consulting Ltd
 * Copyright 2001,2002 Ananova Ltd
 * Copyright 2002,2003,2006 Olly Betts
 * 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
 * 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

#include <config.h>

#include <xapian.h>

#define PROGRAM_NAME "omega"

#include "configfile.h"

#include <map>
#include <vector>

using namespace std;

const char filter_sep = '-';
// Any choice of character for filter_sep could conceivably lead to
// false positives, but the situation is contrived, and just means that if
// someone changed a filter, the first page wouldn't be forced.
// That's hardly the end of the world...

extern string query_string;

extern string dbname;
extern string fmtname;
extern string filters;

extern Xapian::Database db;
extern Xapian::Enquire * enquire;
extern Xapian::RSet rset;

extern Xapian::docid topdoc;
extern Xapian::docid hits_per_page;
extern Xapian::docid min_hits;

extern int threshold;

extern bool sort_numeric;
extern Xapian::valueno sort_key;
extern bool sort_ascending;
extern Xapian::valueno collapse_key;
extern bool collapse;

extern map<string, string> option;

extern string date_start, date_end, date_span;

extern const string default_dbname;

class ExpandDeciderOmega : public Xapian::ExpandDecider {
      Xapian::Database db;
      ExpandDeciderOmega(const Xapian::Database &db_) : db(db_) { }
      int operator()(const string & tname) const {
          // only suggest 4 or more letter words for now to
          // avoid italian problems FIXME: fix this at index time
          if (tname.length() <= 3) return false;

          // Ignore a term that only occurs once (a hapax) since it's not
          // useful for finding related documents - it only occurs in a
          // document that's already been marked as relevant
          if (db.get_termfreq(tname) <= 1) return false;

          // Raw terms are OK, otherwise avoid terms with a prefix or with a
          // space in
          if (tname[0] == 'R') return true;
          if (isupper(static_cast<unsigned char>(tname[0])) ||
            tname.find(' ') != string::npos) {
            return false;

          return true;

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