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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 <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;
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