// Index each paragraph of a text file as a Xapian document.
//
// Copyright (c) 2003 James Aylett
// Copyright (c) 2004,2006,2007 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
// 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, see
// <https://www.gnu.org/licenses/>.

using System;

class SimpleIndex {
    public static void Main(string[] argv) {
        if (argv.Length != 1) {
            Console.Error.WriteLine("Usage: SimpleIndex PATH_TO_DATABASE");
            Environment.Exit(1);
        }

        try {
            // Open the database for update, creating a new database if
            // necessary.
            Xapian.WritableDatabase database;
            database = new Xapian.WritableDatabase(argv[0], Xapian.Xapian.DB_CREATE_OR_OPEN);

            Xapian.TermGenerator indexer = new Xapian.TermGenerator();
            Xapian.Stem stemmer = new Xapian.Stem("english");
            indexer.SetStemmer(stemmer);

            string para = "";
            while (true) {
                string line = Console.In.ReadLine();
                if (line == null) {
                    if (para == "") break;
                    line = "";
                }
                line = line.Trim();
                if (line == "") {
                    if (para != "") {
                        // We've reached the end of a paragraph, so index it.
                        Xapian.Document doc = new Xapian.Document();
                        doc.SetData(para);

                        indexer.SetDocument(doc);
                        indexer.IndexText(para);

                        // Add the document to the database.
                        database.AddDocument(doc);
                        para = "";
                    }
                } else {
                    if (para != "") para += " ";
                    para += line;
                }
            }
        } catch (Exception e) {
            Console.Error.WriteLine("Exception: " + e.ToString());
            Environment.Exit(1);
        }
    }
}
