tree sort : how do I make the hidden files always last in the tree ?

[zackAJ]

sort_function = function(a, b)
      
	-- wanted:  a.is_hidden ?

	if a.type == b.type then
	        return a.path > b.path
	else
		return a.type > b.type
	end
end,

[zackAJ]

this is the best I could do: dotfiles and dotdirectories always last

	sort_function = function(a, b)
				if a.name and b.name then
					local a_is_hidden = a.name:sub(1, 1) == "."
					local b_is_hidden = b.name:sub(1, 1) == "."

					if a_is_hidden and not b_is_hidden then
						return false
					elseif not a_is_hidden and b_is_hidden then
						return true
					end
				end
				if a.type == b.type then
					return a.path < b.path
				else
					return a.type < b.type
				end
			end,