1 files changed, 76 insertions, 0 deletions
diff --git a/aesxx/utils/helpers/cmd_parser.hpp b/aesxx/utils/helpers/cmd_parser.hpp
new file mode 100644
index 0000000..607253c
--- /dev/null
+++ b/aesxx/utils/helpers/cmd_parser.hpp
@@ -0,0 +1,76 @@
+// Copyright (c) 2017 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "AES tools" project.
+// For details, see https://github.com/egor-tensin/aes-tools.
+// Distributed under the MIT License.
+
+#pragma once
+
+#include <boost/program_options.hpp>
+
+#include <exception>
+#include <filesystem>
+#include <format>
+#include <iostream>
+#include <ostream>
+#include <string>
+#include <string_view>
+
+class SettingsParser {
+public:
+    explicit SettingsParser(std::string_view argv0) : prog_name{extract_filename(argv0)} {
+        visible.add_options()("help,h", "show this message and exit");
+    }
+
+    virtual ~SettingsParser() = default;
+
+    virtual const char* get_short_description() const {
+        return "[--option VALUE]...";
+    }
+
+    virtual void parse(int argc, char* argv[]) {
+        boost::program_options::options_description all;
+        all.add(hidden).add(visible);
+        boost::program_options::variables_map vm;
+        boost::program_options::store(
+            boost::program_options::command_line_parser{argc, argv}
+                .options(all)
+                .positional(positional)
+                .run(),
+            vm
+        );
+        if (vm.count("help"))
+            exit_with_usage = true;
+        else
+            boost::program_options::notify(vm);
+    }
+
+    bool exit_with_usage = false;
+
+    void usage() const {
+        std::cout << *this;
+    }
+
+    void usage_error(const std::exception& e) const {
+        std::cerr << std::format("usage error: {}\n", e.what());
+        std::cerr << *this;
+    }
+
+protected:
+    boost::program_options::options_description hidden;
+    boost::program_options::options_description visible;
+    boost::program_options::positional_options_description positional;
+
+private:
+    static std::string extract_filename(std::string_view path) {
+        return std::filesystem::path{path}.filename().string();
+    }
+
+    const std::string prog_name;
+
+    friend std::ostream& operator<<(std::ostream& os, const SettingsParser& parser) {
+        const auto short_descr = parser.get_short_description();
+        os << std::format("usage: {} {}\n", parser.prog_name, short_descr);
+        os << parser.visible;
+        return os;
+    }
+};