| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <stdio.h> |
| #include <string> |
| #include <vector> |
| |
| #include <base/logging.h> |
| |
| #include "command.h" |
| |
| class HelpCommand : public Command { |
| public: |
| HelpCommand() |
| : Command("help", "print help information for simpleperf", |
| "Usage: simpleperf help [subcommand]\n" |
| " Without subcommand, print short help string for every subcommand.\n" |
| " With subcommand, print long help string for the subcommand.\n\n") { |
| } |
| |
| bool Run(const std::vector<std::string>& args) override; |
| |
| private: |
| void PrintShortHelp(); |
| void PrintLongHelpForOneCommand(const Command& cmd); |
| }; |
| |
| bool HelpCommand::Run(const std::vector<std::string>& args) { |
| if (args.size() == 1) { |
| PrintShortHelp(); |
| } else { |
| Command* cmd = Command::FindCommandByName(args[1]); |
| if (cmd == nullptr) { |
| LOG(ERROR) << "malformed command line: can't find help string for unknown command " << args[0]; |
| LOG(ERROR) << "try using \"--help\""; |
| return false; |
| } else { |
| PrintLongHelpForOneCommand(*cmd); |
| } |
| } |
| return true; |
| } |
| |
| void HelpCommand::PrintShortHelp() { |
| printf("Usage: simpleperf [--help] subcommand [args_for_subcommand]\n\n"); |
| for (auto& command : Command::GetAllCommands()) { |
| printf("%-20s%s\n", command->Name().c_str(), command->ShortHelpString().c_str()); |
| } |
| } |
| |
| void HelpCommand::PrintLongHelpForOneCommand(const Command& command) { |
| printf("%s\n", command.LongHelpString().c_str()); |
| } |
| |
| HelpCommand help_command; |