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
25class 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
41bool 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
57void 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
64void HelpCommand::PrintLongHelpForOneCommand(const Command& command) {
65  printf("%s\n", command.LongHelpString().c_str());
66}
67
68HelpCommand help_command;
69