Demo

local function centerPrint(text,yPos)
        w, h = term.getSize()
    term.setCursorPos(math.floor(w - #text)/2, yPos)
        term.write(text)
end

local function slowcenterPrint(text,yPos,speed)
        w, h = term.getSize()
    term.setCursorPos(math.floor(w - #text)/2, yPos)
        textutils.slowWrite(text,speed)
end

term.setBackgroundColor(colors.white)
term.setTextColor(colors.black)
term.clear()
os.pullEvent()
slowcenterPrint("Hello",3,20)
slowcenterPrint("This is the Mimic terminal",4,100)
term.setTextColor(colors.red)
centerPrint("Press any key to continue", 14)
os.pullEvent()
term.setBackgroundColor(colors.white)
term.setTextColor(colors.black)
term.clear()
centerPrint("This is a demo of what the Mimic terminal",3)
centerPrint("can do",4)
sleep(0.4)
term.setTextColor(colors.red)
centerPrint("Press any key to continue", 14)
os.pullEvent()
term.setBackgroundColor(colors.white)
term.setTextColor(colors.black)
term.clear()
centerPrint("To start off,",3)
centerPrint("Mimic is a programmable website",4)
centerPrint("that uses the coding language Lua",5)
-- Copy this
sleep(0.4)
term.setTextColor(colors.red)
centerPrint("Press any key to continue", 14)
os.pullEvent()
term.setBackgroundColor(colors.white)
term.setTextColor(colors.black)
term.clear()
-- Copy this
centerPrint("In Mimic, you can do things like change",3)
term.setTextColor(colors.blue)
centerPrint("the color of text",4)
term.setTextColor(colors.black)
centerPrint("You can also change",5)
term.setBackgroundColor(colors.lime)
centerPrint("the color of the background",6)
sleep(0.4)
term.setTextColor(colors.red)
term.setBackgroundColor(colors.white)
centerPrint("Press any key to continue", 14)
os.pullEvent()
term.setBackgroundColor(colors.white)
term.setTextColor(colors.black)
term.clear()
centerPrint("You can also do complex mathematical functions",3)
centerPrint("such as sine, cosine, and tangent",4)
sleep(0.4)
term.setTextColor(colors.red)
term.setBackgroundColor(colors.white)
centerPrint("Press any key to continue", 14)
os.pullEvent()
term.setBackgroundColor(colors.white)
term.setTextColor(colors.black)
term.clear()
centerPrint("There are 5 values in Lua",3)
centerPrint("Booleans, Strings, Numbers, Tables and Functions",4)
centerPrint("A boolean is a true or false value",6)
centerPrint("A string is a text value",8)
centerPrint("A number is well a number value",10)
centerPrint("A table is a set of values",12)
centerPrint("A function is a keyword that runs code",14)
sleep(0.4)
term.setTextColor(colors.red)
term.setBackgroundColor(colors.white)
centerPrint("Press any key to continue", 17)
os.pullEvent()
term.setBackgroundColor(colors.white)
term.setTextColor(colors.black)
term.clear()
centerPrint("Lets start off with some vocabulary",2)
centerPrint("library : a large table filled with functions",4)
centerPrint("Typically, a library is called an API",5)
centerPrint("execute : to run one or more lines of code",7)
centerPrint("arguments/parameters : info given to a function",9)
centerPrint("Say you wanted a computer to write something",10)
centerPrint("You would have to tell it what to write",11)
centerPrint("That is what an argument or parameter is",12)
centerPrint("It is commonly abbreviated as arg/param",13)
sleep(0.4)
term.setTextColor(colors.red)
term.setBackgroundColor(colors.white)
centerPrint("Press any key to continue", 15)
os.pullEvent()
term.setBackgroundColor(colors.white)
term.setTextColor(colors.black)
term.clear()
centerPrint("This isn't a full lesson",3)
centerPrint("Rather, it is a demonstration",4)
centerPrint("So I will just get on with the demonstration",5)
centerPrint("of what Mimic can do",6)
sleep(0.4)
term.setTextColor(colors.red)
term.setBackgroundColor(colors.white)
centerPrint("Press any key to continue", 15)
os.pullEvent()
term.setBackgroundColor(colors.white)
term.setTextColor(colors.black)
term.clear()
paintutils.drawLine(2,3,50,3,colors.lightGray)
term.setCursorPos(2,3)
term.setTextColor(colors.black)
term.setCursorPos(2,3)
local text = read()
repeat
  term.setCursorPos(math.random(1,51-#text),math.random(1,19))
  term.setBackgroundColor(2^math.random(1,15))
  term.setTextColor(2^math.random(1,15))
  term.write(text)
  os.startTimer(0.1)
  local event = os.pullEvent()
until event ~= "timer"
term.setBackgroundColor(colors.white)
term.clear()
term.setCursorPos(1,1)
-- Rain prog starts here
sleep(0.3)
local rain = {}
local maxX, maxY = term.getSize()
function newrain()
  local axis = math.random(1,2) == 1 and true or false
  local template = {
  x = axis == true and math.random(1,maxX) or maxX,
  y = axis == false and math.random(1,maxY) or 1,
  color = colors.blue,
  velo = math.random(1,4) == 4 and 2 or 1
  }
  table.insert(rain,template)
end

function redraw(bool)
  term.setBackgroundColor(bool == true and colors.white or colors.black)
  term.clear()
  for i,v in ipairs(rain) do
    term.setCursorPos(v.x,v.y)
    term.setTextColor(v.color)
    term.write("/")
    v.x = v.x - v.velo
    v.y = v.y + v.velo
    if v.y > maxX or v.x < 1 then
      table.remove(rain,i)
    end
  end
end

local boolean
local light = 0
repeat
    for i=1,3 do
        newrain()
    end
    if boolean == true then
        light = light + 1
        if light == 5 then -- Display lightning for 5 ticks
            boolean = false
            light = 0
        end
    else
        boolean = math.random(1,100) == 1 and true or false -- If the number 1 gets chosen, it sets "boolean" to true
        if boolean == true and commands then
            commands.exec("playsound ambient.weather.thunder"..math.random(1,3).." @p")
        end
    end
    redraw(boolean)
    os.startTimer(0.01)
    if commands then
        commands.exec("playsound ambient.weather.rain @p")
    end
    local event = os.pullEvent()
until event ~= "timer"