beedb/include/util/command_line_interface.h

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/*------------------------------------------------------------------------------*
* Architecture & Implementation of DBMS *
*------------------------------------------------------------------------------*
* Copyright 2022 Databases and Information Systems Group TU Dortmund *
* Visit us at *
* http://dbis.cs.tu-dortmund.de/cms/en/home/ *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR *
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, *
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR *
* OTHER DEALINGS IN THE SOFTWARE. *
* *
* Authors: *
* Maximilian Berens <maximilian.berens@tu-dortmund.de> *
* Roland Kühn <roland.kuehn@cs.tu-dortmund.de> *
* Jan Mühlig <jan.muehlig@tu-dortmund.de> *
*------------------------------------------------------------------------------*
*/
#pragma once
#include <linenoise.h>
#include <optional>
#include <string>
namespace beedb::util
{
class CommandLineInterface
{
public:
CommandLineInterface(std::string &&history_file_name, std::string &&prompt_message)
: _history_file_name(std::move(history_file_name)), _prompt_message(std::move(prompt_message))
{
linenoiseHistoryLoad(_history_file_name.c_str());
}
std::optional<std::string> next()
{
char *line;
if ((line = linenoise(_prompt_message.c_str())) != nullptr)
{
auto line_as_string = std::string{line};
std::free(line);
linenoiseHistoryAdd(line_as_string.c_str());
linenoiseHistorySave(_history_file_name.c_str());
return std::make_optional(std::move(line_as_string));
}
return std::nullopt;
}
private:
const std::string _history_file_name;
const std::string _prompt_message;
};
} // namespace beedb::util