todolist

local tArgs = {...}
local command = tArgs[1]

function help()
    term.clear()
    term.setCursorPos(1,1)
    print("ToDoList 1.0 by zachdyer")
    print(" ")
    print("USAGE:")
    print("Type 'todolist help' for usage instructions.")
    print("Type 'todolist add <entry>' to add a task")
    print("Type 'todolist' to display your list.")
    print("Type 'todolist del <number>' to delete a task.")
end
function getTasks()
    local task = {}
    local file = fs.open("tasks","r")
    local i = 1
    while true do
        task[i] = file.readLine()
        if task[i] == nil then
            break
        else
            i = i + 1
        end
    end
    file.close()
    return task
end
function saveTasks(taskTable)
    local list = ""
    local file = fs.open("tasks","w")
    for i = 1, #taskTable, 1 do
         list = list .. taskTable[i] .. "\n"
    end
    file.write(list)
    file.close()
end
function printTasks()
    local task = getTasks()
    if task[1] == nil then
        help()
    else
        term.clear()
        term.setCursorPos(1,1)
        local w, h = term.getSize()
        print("Printing your tasks...")
        for i = 1, #task, 1 do
            local x, y = term.getCursorPos()
            if y == h - 2 then
                print(i .. ". " .. task[i])
                print("Press any key to continue...")
                os.pullEvent("char")
                term.clear()
                term.setCursorPos(1,1)
            else
                print(i .. ". " .. task[i])
            end
        end
    end
end

if command == "add" then
    local entry = ""
    for i = 2, #tArgs, 1 do
       entry = entry .. tArgs[i] .. " "
    end
    print("Adding " .. entry)
    local task = getTasks()
    task[#task + 1] = entry
    saveTasks(task)
elseif command == "help" then
    help()
elseif command == nil then
    if fs.exists("tasks") then
        printTasks()
    else
        help()
    end
elseif command == "del" then
    local number = tonumber(tArgs[2])
    local task = getTasks()
    if number > #task then
       print("Task number " .. number .. " does not exist.")
    else
        print("Deleting task number " .. number .. ". " .. task[number])
        table.remove(task,number)
        saveTasks(task)
    end
end