Split code generation from the ui

cli/cl.cpp

@@ -0,0 +1,52 @@
+#include "elna/cli/cl.hpp"
+#include "elna/backend/target.hpp"
+#include <cstddef>
+#include <fstream>
+#include <sstream>
+
+namespace elna::cli
+{
+    char *readSource(const char *source)
+    {
+        const std::size_t bufferSize = 255;
+
+        std::ifstream input_stream{ source };
+        std::stringstream buffer;
+        buffer << input_stream.rdbuf();
+        input_stream.close();
+        std::string contents = buffer.str();
+        char *result = reinterpret_cast<char *>(malloc(contents.size() + 1));
+        std::copy(std::cbegin(contents), std::cend(contents), result);
+        result[contents.size()] = '\0';
+
+        return result;
+    }
+
+    int compile(const std::filesystem::path& in_file, const std::filesystem::path& out_file)
+    {
+        auto sourceText = readSource(in_file.c_str());
+        if (sourceText == nullptr)
+        {
+            return 3;
+        }
+        size_t tokensCount{ 0 };
+        auto lex_result = source::lex(sourceText);
+        free(sourceText);
+        if (lex_result.has_errors())
+        {
+            for (const auto& compile_error : lex_result.errors())
+            {
+                printf("%lu:%lu: %s\n", compile_error.line(), compile_error.column(), compile_error.what());
+            }
+            return 1;
+        }
+        auto ast = source::parser(lex_result.success()).parse();
+        if (ast == nullptr)
+        {
+            return 2;
+        }
+        backend::riscv32_elf(ast.get(), out_file);
+
+        return 0;
+    }
+}

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);
+}