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// Copyright (c) 2017 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "PDB repository" project.
// For details, see https://github.com/egor-tensin/pdb-repo.
// Distributed under the MIT License.
#pragma once
#include <boost/filesystem.hpp>
#include <boost/program_options.hpp>
#include <exception>
#include <iostream>
#include <ostream>
#include <string>
namespace
{
class SettingsParser
{
public:
typedef boost::program_options::options_description Options;
typedef boost::program_options::positional_options_description Arguments;
explicit SettingsParser(const std::string& argv0)
: prog_name{extract_filename(argv0)}
{ }
SettingsParser(const std::string& argv0, const Options& options)
: prog_name{extract_filename(argv0)}
, options{options}
{ }
SettingsParser(const std::string& argv0, const Options& options, const Arguments& args)
: prog_name{extract_filename(argv0)}
, options{options}
, args{args}
{ }
virtual ~SettingsParser() = default;
virtual const char* get_short_description() const { return "[OPTION]..."; }
void parse(int argc, char* argv[]) const
{
boost::program_options::variables_map vm;
boost::program_options::store(
boost::program_options::command_line_parser{argc, argv}
.options(options)
.positional(args)
.run(),
vm);
boost::program_options::notify(vm);
}
void usage() const
{
std::cout << *this;
}
void usage_error(const std::exception& e) const
{
std::cerr << "usage error: " << e.what() << '\n';
std::cerr << *this;
}
private:
static std::string extract_filename(const std::string& path)
{
return boost::filesystem::path{path}.filename().string();
}
const std::string prog_name;
const Options options;
const Arguments args;
friend std::ostream& operator<<(std::ostream&, const SettingsParser&);
};
std::ostream& operator<<(std::ostream& os, const SettingsParser& cmd_parser)
{
const auto short_descr = cmd_parser.get_short_description();
os << "usage: " << cmd_parser.prog_name << ' ' << short_descr << '\n';
os << cmd_parser.options;
return os;
}
}
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