From a9de120224fa1dbb1f740d3d51d8bde6432c0884 Mon Sep 17 00:00:00 2001
From: Reto Habluetzel <rethab@rethab.ch>
Date: Wed, 29 Aug 2012 23:12:08 +0200
Subject: added dynnetwork, which selects the busiest network of a list and
 displays it

---
 src/Plugins/Monitors.hs     | 39 +++++++++++++++++++++------------------
 src/Plugins/Monitors/Net.hs | 44 +++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 64 insertions(+), 19 deletions(-)

diff --git a/src/Plugins/Monitors.hs b/src/Plugins/Monitors.hs
index a531e26..bea91eb 100644
--- a/src/Plugins/Monitors.hs
+++ b/src/Plugins/Monitors.hs
@@ -48,24 +48,25 @@ import Plugins.Monitors.Volume
 import Plugins.Monitors.Mpris
 #endif
 
-data Monitors = Weather      Station    Args Rate
-              | Network      Interface  Args Rate
-              | BatteryP     [String]   Args Rate
-              | DiskU        DiskSpec   Args Rate
-              | DiskIO       DiskSpec   Args Rate
-              | Thermal      Zone       Args Rate
-              | ThermalZone  ZoneNo     Args Rate
-              | Memory       Args       Rate
-              | Swap         Args       Rate
-              | Cpu          Args       Rate
-              | MultiCpu     Args       Rate
-              | Battery      Args       Rate
-              | Brightness   Args       Rate
-              | CpuFreq      Args       Rate
-              | CoreTemp     Args       Rate
-              | TopProc      Args       Rate
-              | TopMem       Args       Rate
-              | Uptime       Args       Rate
+data Monitors = Weather      Station     Args Rate
+              | Network      Interface   Args Rate
+              | DynNetwork   [Interface] Args Rate
+              | BatteryP     [String]    Args Rate
+              | DiskU        DiskSpec    Args Rate
+              | DiskIO       DiskSpec    Args Rate
+              | Thermal      Zone        Args Rate
+              | ThermalZone  ZoneNo      Args Rate
+              | Memory       Args        Rate
+              | Swap         Args        Rate
+              | Cpu          Args        Rate
+              | MultiCpu     Args        Rate
+              | Battery      Args        Rate
+              | Brightness   Args        Rate
+              | CpuFreq      Args        Rate
+              | CoreTemp     Args        Rate
+              | TopProc      Args        Rate
+              | TopMem       Args        Rate
+              | Uptime       Args        Rate
 #ifdef IWLIB
               | Wireless Interface  Args Rate
 #endif
@@ -95,6 +96,7 @@ type DiskSpec  = [(String, String)]
 instance Exec Monitors where
     alias (Weather s _ _) = s
     alias (Network i _ _) = i
+    alias (DynNetwork _ _ _) = "dynnetwork"
     alias (Thermal z _ _) = z
     alias (ThermalZone z _ _) = "thermal" ++ show z
     alias (Memory _ _) = "memory"
@@ -126,6 +128,7 @@ instance Exec Monitors where
     alias (Mpris2 _ _ _) = "mpris2"
 #endif
     start (Network  i a r) = startNet i a r
+    start (DynNetwork is a r) = startDynNet is a r
     start (Cpu a r) = startCpu a r
     start (MultiCpu a r) = startMultiCpu a r
     start (TopProc a r) = startTop a r
diff --git a/src/Plugins/Monitors/Net.hs b/src/Plugins/Monitors/Net.hs
index 768907c..170da07 100644
--- a/src/Plugins/Monitors/Net.hs
+++ b/src/Plugins/Monitors/Net.hs
@@ -13,12 +13,16 @@
 --
 -----------------------------------------------------------------------------
 
-module Plugins.Monitors.Net (startNet) where
+module Plugins.Monitors.Net (
+                        startNet
+                      , startDynNet
+                      ) where
 
 import Plugins.Monitors.Common
 
 import Data.IORef (IORef, newIORef, readIORef, writeIORef)
 import Data.Time.Clock (UTCTime, getCurrentTime, diffUTCTime)
+import Control.Monad (forM, filterM, liftM)
 
 import qualified Data.ByteString.Lazy.Char8 as B
 
@@ -28,6 +32,23 @@ data NetDev = NA
 
 type NetDevRef = IORef (NetDev, UTCTime)
 
+{- The more information available, the better.
+ - Note that names don't matter. Therefore, if only the names differ,
+ - a compare evaluates to EQ while (==) evaluates to False.
+ -}
+instance Ord NetDev where
+    compare NA NA              = EQ
+    compare NA _               = LT
+    compare _  NA              = GT
+    compare (NI _) (NI _)      = EQ
+    compare (NI _) (ND _ _ _)  = LT
+    compare (ND _ _ _) (NI _)  = GT
+    compare (ND _ x1 y1) (ND _ x2 y2) =
+        if downcmp /= EQ
+           then downcmp
+           else y1 `compare` y2
+      where downcmp = x1 `compare` x2
+
 netConfig :: IO MConfig
 netConfig = mkMConfig
     "<dev>: <rx>KB|<tx>KB"      -- template
@@ -103,9 +124,30 @@ parseNet nref nd = do
 runNet :: NetDevRef -> String -> [String] -> Monitor String
 runNet nref i _ = io (parseNet nref i) >>= printNet
 
+parseNets :: [(NetDevRef, String)] -> IO [NetDev]
+parseNets = mapM (\(ref, i) -> parseNet ref i)
+
+runNets :: [(NetDevRef, String)] -> [String] -> Monitor String
+runNets refs _ = io (parseActive refs) >>= printNet
+    where parseActive refs = parseNets refs >>= return . selectActive
+
+selectActive :: [NetDev] -> NetDev
+selectActive = maximum
+                   
 startNet :: String -> [String] -> Int -> (String -> IO ()) -> IO ()
 startNet i a r cb = do
   t0 <- getCurrentTime
   nref <- newIORef (NA, t0)
   _ <- parseNet nref i
   runM a netConfig (runNet nref i) r cb
+
+startDynNet :: [String] -> [String] -> Int -> (String -> IO ()) -> IO ()
+startDynNet is a r cb = do
+  refs <- forM is $ \i -> do
+            t <- getCurrentTime
+            nref <- newIORef (NA, t)
+            _ <- parseNet nref i
+            return (nref, i)
+  runM a netConfig (runNets refs) r cb
+
+-- TODO: Prelude.head: empty list
-- 
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