-----------------------------------------------------------------------------
-- |
-- Module      : System.Information.Network
-- Copyright   : (c) José A. Romero L.
-- License     : BSD3-style (see LICENSE)
--
-- Maintainer  : José A. Romero L. <escherdragon@gmail.com>
-- Stability   : unstable
-- Portability : unportable
--
-- Provides information about network traffic over selected interfaces,
-- obtained from parsing the @\/proc\/net\/dev@ file using some of the
-- facilities provided by the "System.Information.StreamInfo" module.
--
-----------------------------------------------------------------------------

module System.Information.Network (getNetInfo) where

import System.Information.StreamInfo (getParsedInfo)

-- | Returns a two-element list containing the current number of bytes
-- received and transmitted via the given network interface (e.g. \"wlan0\"),
-- according to the contents of the @\/proc\/dev\/net@ file.
getNetInfo :: String -> IO [Integer]
getNetInfo = getParsedInfo "/proc/net/dev" parse

parse :: String -> [(String, [Integer])]
parse = map tuplize . map words . drop 2 . lines

tuplize :: [String] -> (String, [Integer])
tuplize s = (init $ head s, map read [s!!1, s!!out])
    where out = (length s) - 8