App

To install the appstore app, right-click on your turtle to open the GUI, run pastebin get iXRkjNsG appstore. To install Module1, run appstore get Skeemer Module1.
-- https://turtleappstore.com/u/Skeemer/a/Module1

function selectItem(name)
  -- check all inventory slots
  local item
  for slot = 1, 16 do
    item = turtle.getItemDetail(slot)
    if item ~= nil and item['name'] == name then
      turtle.select(slot)
      return true
    end
  end
  return false  -- couldn't find item
end


function selectEmptySlot()
  -- loop through all slots
  for slot = 1, 16 do  
    if turtle.getItemCount(slot) == 0 then
      turtle.select(slot)
      return true
    end
  end
  return false -- couldn't find empty space
end

function totalCountOfItem(name)
  --check all slots
  local item
  local count = 0
  for slot = 1,16 do
    item = turtle.getItemDetail(slot)
    if item ~= nil and item['name'] == name then
      count = count + turtle.getItemCount(slot)
    end
  end
  return count
end

function sweep(length, width, sweepFunc)
  local turnRightNext = true

  for x = 1, width do
    for y = 1, length do
      sweepFunc()
 
      -- don't move forward on the last row
      if y ~= length then
        turtle.forward()
      end
    end
 
    -- don't turn on the last column
    if x ~= width then
      -- turn to the next column
      if turnRightNext then
        turtle.turnRight()
        sweepFunc()
        turtle.forward()
        turtle.turnRight()
      else
        turtle.turnLeft()
        sweepFunc()
        turtle.forward()
        turtle.turnLeft()
      end
 
      turnRightNext = not turnRightNext
    end
  end

  -- move back to the start position
  if width % 2 == 0 then
    turtle.turnRight()
  else
    for y = 1, length - 1 do
      turtle.back()
    end
    turtle.turnLeft()
  end
 
  for x = 1, width - 1 do
    turtle.forward()
  end
  turtle.turnRight()
 
  return true
end