text

--[[tlfOS Text API]]--

function writeCentered(str, h, startPos, endPos)
  if h == nil then
    _, h = term.getCursorPos()
  end
  if startPos == nil then
    local w = term.getSize()
    term.setCursorPos((w - #str)/2,h)
  else
    w = endPos - startPos
    term.setCursorPos((w - #str)/2 + startPos,h)
  end

  write(str)
end

function printCentered(str, h, startPos, endPos)
  writeCentered(str, h, startPos, endPos)
  print()
end

function getLongestString(t)
  local length = 0

  for i = 1, #t do
    if #t[i] > length then
      length = #t[i]
    end
  end

  return length
end

function readWithBoundaries(xposStart, xposEnd, ypos, charReplace)
  local t = {}
  term.setCursorPos(xposStart, ypos)
  term.setCursorBlink(true)
  local diff = xposEnd - xposStart

  if diff < 1 then
    error("The second number must be bigger than the first")
  end

  local function refreshLine()
    term.setCursorPos(xposStart, ypos)
    for i = 1, diff do
      write(" ")
    end
    term.setCursorPos(xposStart, ypos)
    if charReplace ~= nil and charReplace ~= "" then
      if #t > diff then
        for i = 1, diff do
          write(charReplace)
        end
      else
        for i = 1, #t do
          write(charReplace)
        end
      end
    else
      if #t > diff then
        for i = 1, diff do
          write(t[#t - diff + i])
        end
      else
        for i = 1, #t do
          write(t[i])
        end
      end
    end
  end

  while true do
    local p1, p2 = os.pullEvent()

    if p1 == "char" then
      table.insert(t, p2)
    elseif p1 == "key" and p2 == 28 then
      str = ""
      for i = 1, #t do
        str = str..t[i]
      end
      term.setCursorBlink(false)
      return str
    elseif p1 == "key" and p2 == 14 then
      table.remove(t, #t)
    end
    refreshLine()
  end
end