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/*
* 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 <android-base/logging.h>
#include "command.h"
namespace simpleperf {
namespace {
class HelpCommand : public Command {
public:
HelpCommand()
: Command("help", "print help information for simpleperf",
// clang-format off
"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"
// clang-format on
) {}
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 {
std::unique_ptr<Command> cmd = CreateCommandInstance(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(
// clang-format off
"Usage: simpleperf [common options] subcommand [args_for_subcommand]\n"
"common options:\n"
" -h/--help Print this help information.\n"
" --log <severity> Set the minimum severity of logging. Possible severities\n"
" include verbose, debug, warning, info, error, fatal.\n"
" Default is info.\n"
#if defined(__ANDROID__)
" --log-to-android-buffer Write log to android log buffer instead of stderr.\n"
#endif
" --version Print version of simpleperf.\n"
"subcommands:\n"
// clang-format on
);
for (auto& cmd_name : GetAllCommandNames()) {
std::unique_ptr<Command> cmd = CreateCommandInstance(cmd_name);
printf(" %-20s%s\n", cmd_name.c_str(), cmd->ShortHelpString().c_str());
}
}
void HelpCommand::PrintLongHelpForOneCommand(const Command& command) {
printf("%s\n", command.LongHelpString().c_str());
}
} // namespace
void RegisterHelpCommand() {
RegisterCommand("help", [] { return std::unique_ptr<Command>(new HelpCommand); });
}
} // namespace simpleperf
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