Convert program to 2020: replace foreach loop with map, filter and friends

[User via Digitalmars-d-learn]

I'd like to convert the following program to 2020 standards (i.e, 
replace the foreach block with a one-line code). I've tried much 
and I failed.

This is the code that works (1990s style)
--
import std;

void main()
{
    immutable URL = 
r"https://raw.githubusercontent.com/CSSEGISandData/COVID-19/master/csse_covid_19_data/csse_covid_19_time_series/time_series_covid19_confirmed_global.csv";;
    immutable LOCAL = r"local-file";
    immutable country = "Poland";

    download(URL, LOCAL);

    auto file = File(LOCAL, "r");
    int i = 0;

    foreach(rec; file.byLine())
    {
        auto x = rec.splitter(',').array;

        if (i == 0)
        {
            // Print Header
            writeln(x);
        }
        else if (x[1] == country)
        {
            // Print Country Line
            writeln(x);
            break;
        }

        i++;
    }
}
--