args.hpp

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// SPDX-FileCopyrightText: 2024 Pairinteraction Developers
// SPDX-License-Identifier: LGPL-3.0-or-later
 
#pragma once
 
#include <filesystem>
#include <string>
#include <system_error>
 
namespace pairinteraction::args {
inline bool parse_download_missing(int &i, int argc, char **const argv, bool &download_missing) {
    if (i >= argc || std::string(argv[i]) != "--download-missing") {
        return false;
    }
 
    download_missing = true;
 
    return true;
}
 
inline bool parse_database_dir(int &i, int argc, char **const argv,
                               std::filesystem::path &database_dir) {
    if (i >= argc || std::string(argv[i]) != "--database-dir") {
        return false;
    }
 
    if (++i >= argc) {
        throw std::runtime_error("Option --database-dir expects an arguments, but none is given.");
    }
 
    database_dir = argv[i];
    if (!std::filesystem::exists(database_dir)) {
        return true;
    }
 
    database_dir = std::filesystem::canonical(database_dir);
    if (!std::filesystem::is_directory(database_dir)) {
        throw std::filesystem::filesystem_error("Cannot access database", database_dir.string(),
                                                std::make_error_code(std::errc::not_a_directory));
    }
 
    return true;
}
 
inline bool parse_data_dir(int &i, int argc, char **const argv, std::filesystem::path &data_dir) {
    if (i >= argc || std::string(argv[i]) != "--data-dir") {
        return false;
    }
 
    if (++i >= argc) {
        throw std::runtime_error("Option --data-dir expects an arguments, but none is given.");
    }
 
    data_dir = argv[i];
    if (!std::filesystem::exists(data_dir)) {
        return true;
    }
 
    data_dir = std::filesystem::canonical(data_dir);
    if (!std::filesystem::is_directory(data_dir)) {
        throw std::filesystem::filesystem_error("Cannot access data directory", data_dir.string(),
                                                std::make_error_code(std::errc::not_a_directory));
    }
 
    return true;
}
 
} // namespace pairinteraction::args