local printer = peripheral.find("printer")

if not printer then
    print("No printer attached!")
    return
end

term.setCursorBlink(true)

function replace_char(pos, str, r)
    return str:sub(1, pos-1) .. r .. str:sub(pos+1)
end

local grid = {  }

for j = 1, 21 do
    grid[j] = string.rep(" ", 25)
end

pos = { 1, 1 }

term.setCursorPos(1, 1)

while true do

    local event, keyraw, isHeld = os.pullEvent("key")

    local key = keys.getName(keyraw)

    if (string.len(key) == 1) then
        term.write(key)

        grid[pos[1]] = replace_char(pos[2], grid[pos[1]], key)

        pos[2] = pos[2] + 1

        if pos[2] == 26 then
            pos = { pos[1]+1, 1 }
            term.setCursorPos(1, pos[1])
        end

    elseif key == "tab" then

    end

end