string DescribeFiles (IFile[] files)
{
var msg = "";
if (files.Length == 1) {
msg = files [0].IsDirectory ? "Folder" : App.DocumentBaseName;
} else {
var ndir = files.Count (x => x.IsDirectory);
var ndoc = files.Length - ndir;
var head = "";
if (ndoc > 0) {
msg = ndoc + " " + (ndoc > 1 ? App.DocumentBaseNamePluralized : App.DocumentBaseName);
head = ", ";
}
if (ndir > 0) {
msg += head + ndir + (ndir > 1 ? " Folders" : " Folder");
}
}
return msg;
}