Display a progress bar when downloading files.

[Gintaras]

Code:

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// script "download with progress.cs"
string url = "https://www.quickmacros.com/quickmac.exe";
url = "https://www.libreautomate.com/LibreAutomateSetup.exe";
string file = folders.Downloads + pathname.getName(url);
try {
#if !true //standard dialog
    if (!internet.http.Get(url, dontWait: true).Download(file)) { print.it("canceled"); return; }
#else //custom dialog
    if (!internet.http.Get(url, dontWait: true).Download2(file)) { print.it("canceled"); return; }
#endif
}
catch (Exception e1) {
    print.warning($"Failed to download. {e1.ToStringWithoutStack()}");
    return;
}
print.it("downloaded");

static class MyInternetExt {
    /// <inheritdoc cref="ExtInternet.Download(System.Net.Http.HttpResponseMessage, string, Action{ProgressArgs}, CancellationToken)"/>
    public static bool Download2(this System.Net.Http.HttpResponseMessage t, string file, CancellationToken cancel = default) {
        t.EnsureSuccessStatusCode();
        long size = t.Content.Headers.ContentLength ?? 0;
        
        string filename = pathname.getName(t.RequestMessage.RequestUri.AbsolutePath);
        
        string _DialogText(long bytes) => $"{filename}\n{bytes / 1048576d:0.#} MB";
        
        var pd = dialog.showProgress(size == 0, "TODO: change this text", _DialogText(size));
        
        Action<ProgressArgs> progress = pa => {
            if (!pd.IsOpen) { pd = null; throw new OperationCanceledException(); }
            if (size > 0) pd.Send.Progress(pa.Percent);
            else pd.Send.ChangeText2(_DialogText(pa.Current), resizeDialog: false);
        };
        
        try {
            if (!t.Download(file, progress, cancel)) return false;
        }
        catch (OperationCanceledException) { return false; }
        finally { pd?.Send.Close(); }
        
        return true;
    }
}