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97 lines
2.9 KiB
97 lines
2.9 KiB
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <string>
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#include <vector>
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#include <android-base/logging.h>
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#include "command.h"
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namespace simpleperf {
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namespace {
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class HelpCommand : public Command {
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public:
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HelpCommand()
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: Command("help", "print help information for simpleperf",
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// clang-format off
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"Usage: simpleperf help [subcommand]\n"
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" Without subcommand, print short help string for every subcommand.\n"
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" With subcommand, print long help string for the subcommand.\n\n"
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// clang-format on
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) {}
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bool Run(const std::vector<std::string>& args) override;
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private:
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void PrintShortHelp();
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void PrintLongHelpForOneCommand(const Command& cmd);
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};
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bool HelpCommand::Run(const std::vector<std::string>& args) {
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if (args.empty()) {
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PrintShortHelp();
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} else {
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std::unique_ptr<Command> cmd = CreateCommandInstance(args[0]);
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if (cmd == nullptr) {
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LOG(ERROR) << "malformed command line: can't find help string for "
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"unknown command "
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<< args[0];
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LOG(ERROR) << "try using \"--help\"";
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return false;
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} else {
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PrintLongHelpForOneCommand(*cmd);
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}
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}
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return true;
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}
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void HelpCommand::PrintShortHelp() {
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printf(
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// clang-format off
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"Usage: simpleperf [common options] subcommand [args_for_subcommand]\n"
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"common options:\n"
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" -h/--help Print this help information.\n"
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" --log <severity> Set the minimum severity of logging. Possible severities\n"
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" include verbose, debug, warning, info, error, fatal.\n"
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" Default is info.\n"
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#if defined(__ANDROID__)
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" --log-to-android-buffer Write log to android log buffer instead of stderr.\n"
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#endif
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" --version Print version of simpleperf.\n"
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"subcommands:\n"
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// clang-format on
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);
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for (auto& cmd_name : GetAllCommandNames()) {
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std::unique_ptr<Command> cmd = CreateCommandInstance(cmd_name);
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printf(" %-20s%s\n", cmd_name.c_str(), cmd->ShortHelpString().c_str());
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}
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}
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void HelpCommand::PrintLongHelpForOneCommand(const Command& command) {
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printf("%s\n", command.LongHelpString().c_str());
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}
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} // namespace
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void RegisterHelpCommand() {
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RegisterCommand("help", [] { return std::unique_ptr<Command>(new HelpCommand); });
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}
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} // namespace simpleperf
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