/* $Id$ */

/*
 * Copyright (C) 2005-2006 Richard Braun
 * 
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

/**
 * \file main_cli.cc
 * \brief CLI interface implementation.
 * 
 * Implements a command line interface (CLI) to the mtx engine. The CLI is
 * based on libreadline.
 */

#include <string>
#include <vector>
#include <fstream>
#include <stdio.h>
#include <iostream>
#include <stdlib.h>
#include <readline/history.h>
#include <readline/readline.h>

#include "mtxsymbol.h"
#include "mtxlanguage.h"
#include "mtxexception.h"

#define PROMPT "mtx_cli> "

using namespace std;

static bool
mtx_readline(istream *input, string &line)
{
  if (input == &cin)
    {
      char *tmp;
      tmp = readline(PROMPT);

      if (tmp == NULL)
        return false;

      add_history(tmp);
      line = tmp;
      free(tmp);
      return true;
    }

  else
    {
      if (getline(*input, line))
        {
          cout << PROMPT << line << endl;
          return true;
        }

      else
        return false;
    }
}

int
main(int argc, char *argv[])
{
  vector<MtxSymbol>::iterator results_iterator;
  vector<MtxSymbol> results;
  MtxLanguage language;
  ifstream infile;
  istream *input;
  string line;

  cout << MTX_NOTICE << endl;

  if (argc == 1)
    {
      rl_bind_key('\t', rl_insert);
      input = &cin;
    }

  else if (argc == 2)
    {
      infile.open(argv[1]);

      if (!infile.is_open())
        {
          cerr << "error: unable to open file" << endl;
          return 1;
        }

      input = &infile;
    }

  else
    {
      cout << "usage: mtx_cli [input_file]" << endl;
      return 1;
    }

  while (mtx_readline(input, line))
    {
      try
        {
          results = language.parse(line);

          for (results_iterator = results.begin();
               results_iterator != results.end();
               results_iterator++)
            {
              if (!(*results_iterator).isSpecial())
                cout << (*results_iterator).getName() << " = ";

              cout << (*results_iterator).toString() << endl;
            }
        }

      catch (MtxException &exception)
        {
          cout << "error: " << exception.what() << endl;
        }
    }

  if (input == &cin)
    {
      clear_history();
      cout << endl;
    }

  else
    infile.close();

  return EXIT_SUCCESS;
}