Table saver and reader

-- Table saving and reading from files API
-- by PaymentOption
-- for evil of ccnet.

-- Takes a table and saves it to a file.
function saveTable(tTable, sFileName)
    if type(tTable) == "table" then
        if not fs.isDir(sFileName) then
            local fileHandle = fs.open(sFileName, "w")

            for nIndex, sValue in pairs(tTable) do
                if type(sValue) ~= "table" then
                    fileHandle.writeLine(sValue)
                else
                    fileHandle.close()
                    error("Cannont write subtables.")
                end
            end

            fileHandle.close()
        else
            error("Cannon save " .. tTable .. " as a directory.")
        end
    else
        error("Cannont save " .. tTable .. " because it is not a table.")
    end
end

-- Takes a file path and attempts to read the contents into a table.
function readTable(sFileName)
    if not fs.isDir(sFileName) and fs.exists(sFileName) then
        local tTable = {}

        local nFileLength_Lines = 0
        local fileHandle = io.open(sFileName, "r")

        for sLine in fileHandle:lines() do
            nFileLength_Lines = nFileLength_Lines + 1
        end
        fileHandle:close()

        fileHandle = fs.open(sFileName, "r")
        local sValueRead = ""
        for nLine=1, nFileLength_Lines do
            sValueRead = fileHandle.readLine()
            if tonumber(sValueRead) then
                table.insert(tTable, tonumber(sValueRead))
            else
                table.insert(tTable, sValueRead)
            end
        end
        fileHandle.close()

        return tTable
    else
        error("Cannot read a dreictory or a non-existant file.")
    end
end