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init.lua

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+
+-- nil: player is not on ground and did already jump
+-- 1: player is on ground
+-- 2: currently normal jump; dj on next button press
+-- 3: player can on next jump press
+local can_player_dj = {}
+
+local function try_doublejump(player, is_on_ground)
+	if is_on_ground and (can_player_dj[player] == nil or can_player_dj[player] == 3) then
+		can_player_dj[player] = 1
+	end
+
+	if not player:get_player_control().jump then
+		if can_player_dj[player] == 2 then
+			-- normal jump button press stops
+			can_player_dj[player] = 3
+		end
+		return
+	elseif can_player_dj[player] == 1 then
+		-- normal jump starts
+		can_player_dj[player] = 2
+	end
+
+	if can_player_dj[player] ~= 3 then
+		return
+	end
+
+	local vel_y = player:get_player_velocity().y
+	vel_y = math.min(vel_y, 0)
+	player:add_player_velocity({x = 0, y = 6.5 - vel_y, z = 0})
+	can_player_dj[player] = nil
+end
+
+minetest.register_globalstep(function(_)
+	local players = minetest.get_connected_players()
+	for _, player in pairs(players) do
+		-- check if player is on ground
+		local is_on_ground = false
+		if player:get_player_velocity().y == 0 then
+			local pos = player:get_pos()
+			pos.y = math.ceil(pos.y - 0.5)
+			local nodedef = minetest.registered_nodes[minetest.get_node(pos).name]
+			if nodedef and nodedef.walkable then
+				is_on_ground = true
+			end
+		end
+
+		try_doublejump(player, is_on_ground)
+
+		--~ minetest.chat_send_all(can_player_dj[player] or 0)
+	end
+end)

mod.conf

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+name=doublejump