signlib.lua

local buffer = {}
signlib = {}

local cursorX = 1
local cursorY = 1
local empty = {}
local lines = 4
local width = 15
local writecolor = "c"

signlib.colors = {}
signlib.colors.black = 0
signlib.colors.darkBlue = 1
signlib.colors.darkGreen = 2
signlib.colors.darkAqua = 3
signlib.colors.darkRed = 4
signlib.colors.darkPurple = 5
signlib.colors.gold = 6
signlib.colors.gray = 7
signlib.colors.darkGray = 8
signlib.colors.blue = 9
signlib.colors.green = "a"
signlib.colors.aqua = "b"
signlib.colors.red = "c"
signlib.colors.lightPurple = "d"
signlib.colors.yellow = "e"
signlib.colors.white = "f"

for y=1,lines do
  table.insert(buffer,{})
  for x=1,width do
    table.insert(buffer[y]," ")
  end
end

function string.insert(str1, str2, pos) -- thanks stackoverflow https://stackoverflow.com/questions/59561776/how-do-i-insert-a-string-into-another-string-in-lua
    return str1:sub(1,pos)..str2..str1:sub(pos+1)
end

signlib.drawBuffer = function(sign) -- takes a wrapped peripheral
  while true do
    local lines = {} -- this is really expensive but makes messing with insertion easier
    for linenum,line in pairs(buffer) do
      lines[linenum] = ""
      for xnum,char in pairs(line) do
        lines[linenum] = lines[linenum] .. char
      end
    end
    --print(lines[1])
    sign.setSignText(lines[1],lines[2],lines[3],lines[4])
    sleep(0)
  end
end

signlib.setTextColor = function(colorcode)
  writecolor = colorcode
end
-- 15 wide

signlib.setCursorPos = function(x,y)
  if y >= 1 and y <= lines then
    if x >= 1 and x <= width then
      cursorX = x
      cursorY = y
    end
  end
end
signlib.write = function(string)
  string = tostring(string)

  for x = 1, #string do
    local char = string:sub(x,x)
    buffer[cursorY][cursorX + x - 1] = "\u{00a7}" .. writecolor .. char
  end
end

signlib.clear = function()
  for y,_ in pairs(buffer) do
    for x,_ in pairs(buffer[y]) do
      buffer[y][x] = " "
    end
  end
end

return signlib