gen_headers.cpp

// gen_headers.cpp
// Usage: gen_headers <headers_dir> <out_AllHeaders.h>
// Generates a single umbrella header that #includes every SGNV*.h in headers_dir (non-recursive).

#include <algorithm>
#include <filesystem>
#include <fstream>
#include <iostream>
#include <string>
#include <vector>

namespace fs = std::filesystem;

static bool has_ext(const fs::path& p, const char* ext) {
    return p.has_extension() && p.extension().string() == ext;
}
static bool starts_with(const std::string& s, const char* prefix) {
    return s.rfind(prefix, 0) == 0;
}

int main(int argc, char** argv) {
    if (argc < 3) {
        std::cerr << "usage: gen_headers <headers_dir> <out_AllHeaders.h>\n";
        return 2;
    }
    fs::path headersDir = fs::u8path(argv[1]);
    fs::path outFile = fs::u8path(argv[2]);

    if (!fs::exists(headersDir) || !fs::is_directory(headersDir)) {
        std::cerr << "gen_headers: headers_dir not found: " << headersDir << "\n";
        return 2;
    }

    std::vector<std::string> rels;
    for (const auto& de : fs::directory_iterator(headersDir)) {
        if (!de.is_regular_file()) continue;
        const auto& p = de.path();
        if (!has_ext(p, ".h")) continue;
        const std::string fname = p.filename().string();
        // Include only SGNV*.h to avoid noise
        if (!starts_with(fname, "SGNV")) continue;
        // Produce include relative to CWD where AllHeaders.h will live.
        // Caller passes headersDir relative to that CWD, so keep the same.
        fs::path incPath = fs::path(argv[1]) / fname;
        rels.push_back(incPath.generic_string());
    }

    std::sort(rels.begin(), rels.end());
    rels.erase(std::unique(rels.begin(), rels.end()), rels.end());

    std::ofstream os(outFile, std::ios::binary);
    if (!os) {
        std::cerr << "gen_headers: cannot open output: " << outFile << "\n";
        return 2;
    }

    os << "// Auto-generated by gen_headers. Do not edit.\n";
    os << "#pragma once\n\n";
    for (const auto& inc : rels) {
        os << "#include \"" << inc << "\"\n";
    }

    os.flush();
    if (!os) {
        std::cerr << "gen_headers: write failed: " << outFile << "\n";
        return 2;
    }

    std::cout << "Generated AllHeaders.h with " << rels.size() << " headers.\n";
    return 0;
}