1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <stdio.h> 18 #include <string> 19 #include <vector> 20 21 #include <base/logging.h> 22 23 #include "command.h" 24 25 class HelpCommand : public Command { 26 public: 27 HelpCommand() 28 : Command("help", "print help information for simpleperf", 29 "Usage: simpleperf help [subcommand]\n" 30 " Without subcommand, print short help string for every subcommand.\n" 31 " With subcommand, print long help string for the subcommand.\n\n") { 32 } 33 34 bool Run(const std::vector<std::string>& args) override; 35 36 private: 37 void PrintShortHelp(); 38 void PrintLongHelpForOneCommand(const Command& cmd); 39 }; 40 41 bool HelpCommand::Run(const std::vector<std::string>& args) { 42 if (args.size() == 1) { 43 PrintShortHelp(); 44 } else { 45 Command* cmd = Command::FindCommandByName(args[1]); 46 if (cmd == nullptr) { 47 LOG(ERROR) << "malformed command line: can't find help string for unknown command " << args[0]; 48 LOG(ERROR) << "try using \"--help\""; 49 return false; 50 } else { 51 PrintLongHelpForOneCommand(*cmd); 52 } 53 } 54 return true; 55 } 56 57 void HelpCommand::PrintShortHelp() { 58 printf("Usage: simpleperf [--help] subcommand [args_for_subcommand]\n\n"); 59 for (auto& command : Command::GetAllCommands()) { 60 printf("%-20s%s\n", command->Name().c_str(), command->ShortHelpString().c_str()); 61 } 62 } 63 64 void HelpCommand::PrintLongHelpForOneCommand(const Command& command) { 65 printf("%s\n", command.LongHelpString().c_str()); 66 } 67 68 HelpCommand help_command; 69
