Split code generation from the ui

cli/main.cpp

@@ -0,0 +1,47 @@
+#include "elna/cli/cl.hpp"
+
+#include <filesystem>
+#include <iostream>
+#include <boost/program_options.hpp>
+
+int main(int argc, char **argv)
+{
+    boost::program_options::options_description visible{ "Allowed options" };
+    boost::program_options::options_description description;
+    boost::program_options::positional_options_description positional;
+    boost::program_options::variables_map variables_map;
+
+    visible.add_options()
+        ("help", "Print this help message")
+        ("output,o", boost::program_options::value<std::filesystem::path>(), "Output object file")
+    ;
+    description.add_options()
+        ("input", boost::program_options::value<std::filesystem::path>()->required())
+    ;
+    description.add(visible);
+    positional.add("input", 1);
+
+    auto parsed = boost::program_options::command_line_parser(argc, argv)
+        .options(description).positional(positional)
+        .run();
+    boost::program_options::store(parsed, variables_map);
+    boost::program_options::notify(variables_map);
+
+    if (variables_map.count("help"))
+    {
+        std::cout << description << std::endl;
+        return 0;
+    }
+    const auto in_file = variables_map["input"].as<std::filesystem::path>();
+    std::filesystem::path out_file;
+
+    if (variables_map.count("output"))
+    {
+        out_file = variables_map["output"].as<std::filesystem::path>();
+    }
+    else
+    {
+        out_file = in_file.filename().replace_extension(".o");
+    }
+    return elna::cli::compile(in_file, out_file);
+}