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https://github.com/nestriness/cdc-file-transfer.git
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a381541d1b
Switch asset_stream_manager to use Lyra Lyra has a nice simple interface, but a few quirks that we work around, mainly in the BaseCommand class: - It does not support return values from running a command. - It does not support return values from a custom arg parser. - Lyra interprets --bad_arg as positional argument. Fixes #15
74 lines
2.3 KiB
C++
74 lines
2.3 KiB
C++
/*
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* Copyright 2022 Google LLC
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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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#ifndef ASSET_STREAM_MANAGER_BASE_COMMAND_H_
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#define ASSET_STREAM_MANAGER_BASE_COMMAND_H_
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#include <string>
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#include "absl/status/status.h"
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namespace lyra {
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class cli;
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class command;
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class group;
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} // namespace lyra
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namespace cdc_ft {
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// Base class for commands that wraps Lyra commands to reduce common
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// boilerplate like help text display, invalid args and return values from
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// command execution.
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class BaseCommand {
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public:
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// Creates a new command with given |name| and |help| text. After the command
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// ran, the status code as returned by Run() is written to |exit_code|.
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BaseCommand(std::string name, std::string help, int* exit_code);
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~BaseCommand();
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// Registers the command with Lyra. Must be called before parsing args.
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void Register(lyra::cli& cli);
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protected:
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// Adds all optional and required arguments used by the command.
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// Called by Register().
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virtual void RegisterCommandLineFlags(lyra::command& cmd) = 0;
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// Runs the command. Called by lyra::cli::parse() when this command is
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// actually triggered and all flags have been parsed successfully.
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virtual absl::Status Run() = 0;
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private:
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// Called by lyra::cli::parse() after successfully parsing arguments. Catches
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// unknown arguments (Lyra interprets those as positional args, not as an
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// error!), and displays the help text if appropriate, otherwise calls Run().
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void CommandHandler(const lyra::group& g);
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std::string name_;
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std::string help_;
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int* exit_code_ = nullptr;
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bool show_help_ = false;
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// Workaround for invalid args. Lyra doesn't interpret --invalid as invalid
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// argument, but as positional argument "--invalid".
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std::string invalid_arg_;
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};
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} // namespace cdc_ft
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#endif // ASSET_STREAM_MANAGER_BASE_COMMAND_H_
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