local length = 50

local function generate_gallery(pos)
	local i=1
	for n,node in pairs(minetest.registered_nodes) do
		minetest.set_node(vector.add(pos,vector.new(i % length,math.ceil(i / length),0)),{name=n})
		i = i + 1
	end
end

minetest.register_chatcommand("gallery",{
	description="Generates a wall of all registered nodes next to the player",
	privs={debug=true},
	func=function(name,p)
	local pl=minetest.get_player_by_name(name)
	generate_gallery(vector.add(pl:get_pos(),vector.new(0,0,5)))
end})