Davide Pesavento
104 lines
3.2 KiB
C++
104 lines
3.2 KiB
C++
/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
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/*
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* Copyright (c) 2014-2018, Regents of the University of California,
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* Arizona Board of Regents,
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* Colorado State University,
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* University Pierre & Marie Curie, Sorbonne University,
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* Washington University in St. Louis,
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* Beijing Institute of Technology,
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* The University of Memphis.
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*
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* This file is part of NFD (Named Data Networking Forwarding Daemon).
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* See AUTHORS.md for complete list of NFD authors and contributors.
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*
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* NFD is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Foundation,
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* either version 3 of the License, or (at your option) any later version.
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*
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* NFD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* NFD, e.g., in COPYING.md file. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "help.hpp"
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#include "format-helpers.hpp"
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#include <ndn-cxx/util/logger.hpp>
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#include <cerrno>
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#include <cstring>
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#include <unistd.h>
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namespace nfd {
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namespace tools {
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namespace nfdc {
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NDN_LOG_INIT(nfdc.Help);
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const int LIST_COMMAND_NAME_COLUMN_WIDTH = 16;
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void
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helpList(std::ostream& os, const CommandParser& parser, ParseMode mode, const std::string& noun)
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{
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os << "nfdc [-h|--help] [-V|--version] <command> [<args>]\n\n";
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if (noun.empty()) {
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os << "All subcommands:\n";
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}
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else {
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os << "Subcommands starting with " << noun << ":\n";
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}
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std::vector<const CommandDefinition*> commands = parser.listCommands(noun, mode);
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if (commands.empty()) {
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os << " (none)\n";
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return;
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}
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for (auto def : commands) {
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os << " " << def->getNoun() << ' ' << def->getVerb() << ' '
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<< text::Spaces{static_cast<int>(LIST_COMMAND_NAME_COLUMN_WIDTH -
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def->getNoun().size() - def->getVerb().size() - 2)}
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<< def->getTitle() << '\n';
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}
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os << "\nSee 'nfdc help <command>' to read about a specific subcommand.\n";
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}
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static void
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helpCommand(const std::string& noun, const std::string& verb)
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{
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std::string manpage = "nfdc-" + noun;
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::execlp("man", "man", manpage.data(), nullptr);
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NDN_LOG_FATAL("Error opening man page for " << manpage << ": " << std::strerror(errno));
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}
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int
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help(std::ostream& os, const CommandParser& parser, std::vector<std::string> args)
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{
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const auto helpOpts = {"help", "--help", "-h"};
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auto it = std::find_first_of(args.begin(), args.end(), helpOpts.begin(), helpOpts.end());
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if (it == args.end())
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return 2;
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args.erase(it);
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auto noun = args.size() > 0 ? args[0] : "";
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auto verb = args.size() > 1 ? args[1] : "";
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if (noun.empty()) {
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helpList(os, parser);
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return 0;
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}
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else {
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helpCommand(noun, verb); // should not return
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return 1;
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}
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}
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} // namespace nfdc
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} // namespace tools
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} // namespace nfd
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