cmd_help.cc

//
// This file is part of MARLEY (Model of Argon Reaction Low Energy Yields)
//
// MARLEY is free software: you can redistribute it and/or modify it under the
// terms of version 3 of the GNU General Public License as published by the
// Free Software Foundation.
//
// For the full text of the license please see COPYING or
// visit http://opensource.org/licenses/GPL-3.0
//
// Please respect the MCnet academic usage guidelines. See GUIDELINES
// or visit https://www.montecarlonet.org/GUIDELINES for details.
 
// Standard library includes
#include <iostream>
#include <string>
 
// MARLEY includes
#include "marley/CommandHandler.hh"
 
bool marley::CommandHandler::cmd_help( std::deque< std::string >& args ) {
  if ( args.empty() ) {
    marley::CommandHandler::print_top_level_help();
    return true;
  }
 
  if ( args.size() > 1u ) {
    std::cerr << "marley help: too many arguments\n";
    return false;
  }
 
  // If we've made it here, then the help command has exactly one argument
  // which corresponds to a command name or the -h/--help options
  std::string command_name = args.front();
 
  // These options are considered synonyms of the help command itself
  if ( command_name == "-h" || command_name == "--help" ) {
    command_name = "help";
  }
 
  auto cmd_iter = command_map_.find( command_name );
  if ( cmd_iter != command_map_.end() ) {
    cmd_iter->second.print_help_();
    return true;
  }
 
  std::cerr << "marley: unknown command '" << command_name << "'\n";
  std::cerr << "Run 'marley help' for a list of available commands.\n";
  return false;
}