sorcery  Diff

			-- handle page change request
			if fields.nextpage or fields.prevpage then
				local page = math.max(1,bm:get_int('pagenr'))
				if     fields.nextpage then page = page + 1
				elseif fields.prevpage then page = page - 1 end
				bm:set_int('pagenr',math.max(1,page))

				changed = true
			end

			-- handle retitle request
			if fields.title then
				if fields.title ~= bm:get_string('description') then
					if charge_ink(constants.op_cost_retitle) then

			-- handle page change request
			if fields.nextpage or fields.prevpage then
				local page = math.max(1,bm:get_int('pagenr'))
				if     fields.nextpage then page = page + 1
				elseif fields.prevpage then page = page - 1 end
				bm:set_int('pagenr',math.max(1,page))
				minetest.sound_play('sorcery_pgturn', { pos = pos, gain = 0.6 })
				changed = true
			end

			-- handle retitle request
			if fields.title then
				if fields.title ~= bm:get_string('description') then
					if charge_ink(constants.op_cost_retitle) then