Yabin Cui | 67d3abd | 2015-04-16 15:26:31 -0700 | [diff] [blame] | 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) { |
Yabin Cui | ed91cd9 | 2015-04-28 15:54:13 -0700 | [diff] [blame] | 42 | if (args.size() == 1) { |
Yabin Cui | 67d3abd | 2015-04-16 15:26:31 -0700 | [diff] [blame] | 43 | PrintShortHelp(); |
| 44 | } else { |
Yabin Cui | ed91cd9 | 2015-04-28 15:54:13 -0700 | [diff] [blame] | 45 | Command* cmd = Command::FindCommandByName(args[1]); |
Yabin Cui | 67d3abd | 2015-04-16 15:26:31 -0700 | [diff] [blame] | 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; |