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parse_arguments.cc
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parse_arguments.cc
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// Copyright 2023 Google LLC
//
// 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
//
// https://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 "docfx/parse_arguments.h"
#include <cstdlib>
#include <iostream>
#include <sstream>
#include <stdexcept>
namespace docfx {
namespace {
std::string Usage(std::string const& cmd) {
std::ostringstream os;
os << "Usage: " << cmd << " <infile> <library> <version>";
return std::move(os).str();
}
} // namespace
Config ParseArguments(std::vector<std::string> const& args) {
if (args.empty()) throw std::runtime_error(Usage("program-name-missing"));
if (args.size() == 2 && args[1] == "--help") {
std::cout << Usage(args[0]) << "\n";
std::exit(0);
}
if (args.size() != 4) throw std::runtime_error(Usage(args[0]));
// It is tempting to use google::cloud::version_string(), but sometimes the
// tool may be used to generate documentation for older versions of the
// library.
return Config{args[1], args[2], args[3]};
}
} // namespace docfx