public static Dom dom(Lst <Tuple <string, string> > trail, Dom rest) =>
combine(
div(new { @class = "nav-bar" },
combine(
" \\ ",
trail.Take(trail.Count - 1).Map(tup =>
tup.Map((title, url) =>
a(@class: attr("nav-bar-link"),
href: attr(url),
inner: text(title))))
.ToArray()
.Freeze()
.Add(trail.Last().Map(
(title, url) =>
span(new { @class = attr("nav-bar-link"), href = attr(url) }, text(title)))).ToArray())),
rest);
private static string FormatExpects(Lst <string> expects) =>
expects.Count == 0
? ""
: expects.Count == 1
? $"expecting {expects.Head()}"
: $"expecting {String.Join(", ", expects.Take(expects.Count - 1))} or {expects.Last()}";