diff options
author | Yabin Cui <yabinc@google.com> | 2015-04-16 15:26:31 -0700 |
---|---|---|
committer | Yabin Cui <yabinc@google.com> | 2015-04-18 13:58:37 -0700 |
commit | 67d3abd7b26a741347b33402ad32f5c6735ca0bd (patch) | |
tree | 6221972e801ab3aa949308aa012f52390c8dbebe /simpleperf/cmd_help.cpp | |
parent | 81c39be5ecdc37c32439c9b7d078be182505a34e (diff) | |
download | extras-67d3abd7b26a741347b33402ad32f5c6735ca0bd.tar.gz |
Implement simpleperf list subcommand.
simpleperf is used to replace linux/tools/perf. And This CL implements
the list subcommand of it.
Change-Id: I3e6fe854e19cc370070d0fd8416d0aa6fa8f8e90
Diffstat (limited to 'simpleperf/cmd_help.cpp')
-rw-r--r-- | simpleperf/cmd_help.cpp | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/simpleperf/cmd_help.cpp b/simpleperf/cmd_help.cpp new file mode 100644 index 00000000..bf08dba5 --- /dev/null +++ b/simpleperf/cmd_help.cpp @@ -0,0 +1,68 @@ +/* + * 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.empty()) { + PrintShortHelp(); + } else { + Command* cmd = Command::FindCommandByName(args[0]); + 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; |