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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/nowide/args.hpp>
#include <boost/nowide/filesystem.hpp>
#include <boost/nowide/iostream.hpp>
#include <boost/program_options.hpp>
#include <exception>
#include <iostream>
#include <ostream>
#include <string>
class Args {
public:
Args(int argc, char** argv) : argc{argc}, argv{argv}, impl{this->argc, this->argv} {
boost::nowide::nowide_filesystem();
}
int argc;
char** argv;
private:
const boost::nowide::args impl;
};
class SettingsParser {
public:
explicit SettingsParser(int argc, char** argv)
: args{argc, argv}, prog_name{extract_filename(args.argv[0])} {
visible.add_options()("help,h", "show this message and exit");
}
virtual ~SettingsParser() = default;
virtual const char* get_short_description() const { return "[--option VALUE]..."; }
virtual void parse(int argc, char* argv[]) {
boost::program_options::options_description all;
all.add(hidden).add(visible);
boost::program_options::variables_map vm;
boost::program_options::store(boost::program_options::command_line_parser{argc, argv}
.options(all)
.positional(positional)
.run(),
vm);
if (vm.count("help"))
exit_with_usage = true;
else
boost::program_options::notify(vm);
}
bool exit_with_usage = false;
void usage() const { boost::nowide::cout << *this; }
void usage_error(const std::exception& e) const {
boost::nowide::cerr << "usage error: " << e.what() << '\n';
boost::nowide::cerr << *this;
}
protected:
boost::program_options::options_description hidden;
boost::program_options::options_description visible;
boost::program_options::positional_options_description positional;
private:
static std::string extract_filename(char* path) {
return boost::filesystem::path{path}.filename().string();
}
const Args args;
const std::string prog_name;
friend std::ostream& operator<<(std::ostream& os, const SettingsParser& parser) {
const auto short_descr = parser.get_short_description();
os << "usage: " << parser.prog_name << ' ' << short_descr << '\n';
os << parser.visible;
return os;
}
};
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