e86073c703
We want to use the pattern of having a command line flag for each operation in more tools, so extract the logic which finds the selected operation from the command line arguments into a function.
57 lines
1.9 KiB
C++
57 lines
1.9 KiB
C++
/*
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* Copyright (C) 2021-present ScyllaDB
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*/
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/*
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* This file is part of Scylla.
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*
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* Scylla is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Scylla is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Scylla. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <boost/algorithm/string/join.hpp>
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#include <boost/program_options.hpp>
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#include <string>
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#include <vector>
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#include <fmt/format.h>
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namespace tools::utils {
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template<typename Op>
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concept Operation = requires(Op op) {
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{ op.name() }; // returns some string
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};
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template <Operation Op>
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const Op& get_selected_operation(boost::program_options::variables_map& app_config, const std::vector<Op>& operations, std::string_view alias) {
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std::vector<const Op*> found_operations;
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for (const auto& op : operations) {
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if (app_config.contains(op.name())) {
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found_operations.push_back(&op);
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}
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}
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if (found_operations.size() == 1) {
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return *found_operations.front();
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}
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const auto all_operation_names = boost::algorithm::join(operations | boost::adaptors::transformed(
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[] (const Op& op) { return format("--{}", op.name()); } ), ", ");
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if (found_operations.empty()) {
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throw std::invalid_argument(fmt::format("error: missing {}, exactly one of {} should be specified", alias, all_operation_names));
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}
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throw std::invalid_argument(fmt::format("error: need exactly one {}, cannot specify more then one of {}", alias, all_operation_names));
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}
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} // namespace tools::utils
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