Function download_file

src/pull/download_model.cpp:128–197

\brief Download a file from URL to a local file \param url the URL to download from \param local_path the local path to save the file \param progress_cb the progress callback \return true if the file is downloaded, false otherwise

/// \param progress_cb the progress callback
/// \return true if the file is downloaded, false otherwise
bool download_file(const std::string& url, const std::string& local_path, bool is_lfs, std::string remote_oid, 
                   std::function<void(double)> progress_cb) {
    // Reset progress bar tracking for this download
    g_progress_bar_shown = false;
    
    CURL* curl = curl_easy_init();
    if (!curl) {
        std::cerr << "Failed to initialize CURL" << std::endl;
        return false;
    }

    // Create directory if it doesn't exist
    std::filesystem::path path(local_path);
    std::filesystem::create_directories(path.parent_path());

    FILE* fp = fopen(local_path.c_str(), "wb");
    if (!fp) {
        std::cerr << "Failed to open file for writing: " << local_path << std::endl;
        curl_easy_cleanup(curl);
        return false;
    }

    // Hide cursor before starting download
    hide_cursor();

    curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data_to_file);
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);
    curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
    curl_easy_setopt(curl, CURLOPT_USERAGENT, "FastFlowLM/1.0");
    curl_easy_setopt(curl, CURLOPT_TIMEOUT, 3600L); // 1 hour timeout

    // Set progress callback if provided
    if (progress_cb) {
        curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0L);
        curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, progress_callback);
    }

    CURLcode res = curl_easy_perform(curl);
    
    fclose(fp);
    curl_easy_cleanup(curl);

    // Show cursor after download completes
    show_cursor();

    if (res != CURLE_OK) {
        std::cerr << "CURL error: " << curl_easy_strerror(res) << std::endl;
        std::filesystem::remove(local_path); // Remove partial download
        return false;
    }

    // Only add newline if progress bar was shown
    if (g_progress_bar_shown) {
        std::cout << std::endl;
    }