/* -*- mode: C++; indent-tabs-mode: nil; -*-

  *

  * This file is a part of LEMON, a generic C++ optimization library.

  *

  * Copyright (C) 2003-2009

  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

  * (Egervary Research Group on Combinatorial Optimization, EGRES).

  *

  * Permission to use, modify and distribute this software is granted

  * provided that this copyright notice appears in all copies. For

  * precise terms see the accompanying LICENSE file.

  *

  * This software is provided "AS IS" with no warranty of any kind,

  * express or implied, and with no claim as to its suitability for any

  * purpose.

  *

  */

 ///\ingroup demos

 ///\file

 ///\brief Argument parser demo

 ///

 /// This example shows how the argument parser can be used.

 ///

 /// \include arg_parser_demo.cc

 #include <lemon/arg_parser.h>

 using namespace lemon;

 int main(int argc, char **argv)

 {

   // Initialize the argument parser

   ArgParser ap(argc, argv);

   int i;

   std::string s;

   double d = 1.0;

   bool b, nh;

   bool g1, g2, g3;

   // Add a mandatory integer option with storage reference

   ap.refOption("n", "An integer input.", i, true);

   // Add a double option with storage reference (the default value is 1.0)

   ap.refOption("val", "A double input.", d);

   // Add a double option without storage reference (the default value is 3.14)

   ap.doubleOption("val2", "A double input.", 3.14);

   // Set synonym for -val option

   ap.synonym("vals", "val");

   // Add a string option

   ap.refOption("name", "A string input.", s);

   // Add bool options

   ap.refOption("f", "A switch.", b)

     .refOption("nohelp", "", nh)

     .refOption("gra", "Choice A", g1)

     .refOption("grb", "Choice B", g2)

     .refOption("grc", "Choice C", g3);

   // Bundle -gr* options into a group

   ap.optionGroup("gr", "gra")

     .optionGroup("gr", "grb")

     .optionGroup("gr", "grc");

   // Set the group mandatory

   ap.mandatoryGroup("gr");

   // Set the options of the group exclusive (only one option can be given)

   ap.onlyOneGroup("gr");

   // Add non-parsed arguments (e.g. input files)

   ap.other("infile", "The input file.")

     .other("...");

   // Throw an exception when problems occurs. The default behavior is to

   // exit(1) on these cases, but this makes Valgrind falsely warn

   // about memory leaks.

   ap.throwOnProblems();

   // Perform the parsing process

   // (in case of any error it terminates the program)

   // The try {} construct is necessary only if the ap.trowOnProblems()

   // setting is in use.

   try {

     ap.parse();

   } catch (ArgParserException &) { return 1; }

   // Check each option if it has been given and print its value

   std::cout << "Parameters of '" << ap.commandName() << "':\n";

   std::cout << "  Value of -n: " << i << std::endl;

   if(ap.given("val")) std::cout << "  Value of -val: " << d << std::endl;

   if(ap.given("val2")) {

     d = ap["val2"];

     std::cout << "  Value of -val2: " << d << std::endl;

   }

   if(ap.given("name")) std::cout << "  Value of -name: " << s << std::endl;

   if(ap.given("f")) std::cout << "  -f is given\n";

   if(ap.given("nohelp")) std::cout << "  Value of -nohelp: " << nh << std::endl;

   if(ap.given("gra")) std::cout << "  -gra is given\n";

   if(ap.given("grb")) std::cout << "  -grb is given\n";

   if(ap.given("grc")) std::cout << "  -grc is given\n";

   switch(ap.files().size()) {

   case 0:

     std::cout << "  No file argument was given.\n";

     break;

   case 1:

     std::cout << "  1 file argument was given. It is:\n";

     break;

   default:

     std::cout << "  "

               << ap.files().size() << " file arguments were given. They are:\n";

   }

   for(unsigned int i=0;i<ap.files().size();++i)

     std::cout << "    '" << ap.files()[i] << "'\n";

   return 0;

 }