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Diffstat (limited to 'cmds/lshal/HelpCommand.cpp')
-rw-r--r-- | cmds/lshal/HelpCommand.cpp | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/cmds/lshal/HelpCommand.cpp b/cmds/lshal/HelpCommand.cpp new file mode 100644 index 0000000000..6773ace6d2 --- /dev/null +++ b/cmds/lshal/HelpCommand.cpp @@ -0,0 +1,75 @@ +/* + * Copyright (C) 2017 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 "HelpCommand.h" + +#include "Lshal.h" + +namespace android { +namespace lshal { + +std::string HelpCommand::GetName() { + return "help"; +} + +std::string HelpCommand::getSimpleDescription() const { + return "Print help message."; +} + +Status HelpCommand::main(const Arg &arg) { + if (optind >= arg.argc) { + // `lshal help` prints global usage. + mLshal.usage(); + return OK; + } + (void)usageOfCommand(arg.argv[optind]); + return OK; +} + +Status HelpCommand::usageOfCommand(const std::string& c) const { + if (c.empty()) { + mLshal.usage(); + return USAGE; + } + auto command = mLshal.selectCommand(c); + if (command == nullptr) { + // from HelpCommand::main, `lshal help unknown` + mLshal.usage(); + return USAGE; + } + + command->usage(); + return USAGE; + +} + +void HelpCommand::usage() const { + mLshal.err() + << "help:" << std::endl + << " lshal -h" << std::endl + << " lshal --help" << std::endl + << " lshal help" << std::endl + << " Print this help message" << std::endl; + mLshal.forEachCommand([&](const Command* e) { + mLshal.err() << " lshal help " << e->getName() << std::endl + << " Print help message for " << e->getName() << std::endl; + }); + +} + +} // namespace lshal +} // namespace android + |