helper functions of lua

helper.lua

--helper funcs
function desc(descp,sep,charn)
    sep=sep or "-"
    charn= charn or 80
    charn= (charn>=#descp) and 80 or #descp

    leftseps= math.floor((charn-#descp)/2)
    rightseps= charn-leftseps-#descp

    writeNChar(leftseps,sep)
    io.write(descp)
    writeNChar(rightseps,sep)
    print()
    --io.write("left",leftseps,"right",rightseps,"desc",#descp)
end

function writeNChar(n,char)
    for i=1,n do 
        io.write(char)
    end
end

function showTable(table,tableName)
    tableName=tableName or ""
    desc("showTable "..tableName)
    for k,v in pairs(table) do 
        print(string.format("k=%s (%s)---v=%s (%s)",
        tostring(k),type(k),tostring(v),type(v)))
    end
end