From aa5477676dd98fb07a2afa118c29f98a4885fdc9 Mon Sep 17 00:00:00 2001
From: Ramakrishnan Muthukrishnan <ram@rkrishnan.org>
Date: Sat, 25 Jun 2016 07:21:35 +0530
Subject: [PATCH] more hlint cleanups

---
 src/FuncTorrent/Tracker.hs     | 12 ++++++------
 src/FuncTorrent/Tracker/Udp.hs |  9 ++++-----
 2 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/src/FuncTorrent/Tracker.hs b/src/FuncTorrent/Tracker.hs
index ac99ce2..b9e977a 100644
--- a/src/FuncTorrent/Tracker.hs
+++ b/src/FuncTorrent/Tracker.hs
@@ -29,14 +29,13 @@ import Control.Concurrent.Chan (Chan, newChan, readChan, writeChan)
 import Control.Concurrent.MVar (newEmptyMVar, putMVar, readMVar)
 import Control.Monad.State (StateT, liftIO, get, runStateT)
 import Control.Monad (forever)
-import Data.ByteString.Char8 (ByteString, pack, unpack)
+import Data.ByteString.Char8 (ByteString)
 import Data.List (isPrefixOf)
 import Network (PortNumber)
 
 import qualified FuncTorrent.Tracker.Http as HT (trackerLoop)
 import qualified FuncTorrent.Tracker.Udp as UT (trackerLoop)
 import FuncTorrent.Tracker.Types (TState(..), TrackerEventState(..), TrackerProtocol(..), TrackerMsg(..))
-import FuncTorrent.Utils (Port, toPort, getHostname)
 import qualified FuncTorrent.FileSystem as FS (MsgChannel)
 import FuncTorrent.PeerMsgs (Peer)
 
@@ -48,12 +47,13 @@ newTracker = newChan
 runTracker :: MsgChannel -> FS.MsgChannel -> ByteString -> PortNumber
            -> String -> [String] -> Integer -> IO ()
 runTracker msgChannel fsChan infohash port peerId announceList sz = do
+  let fn = getTrackerLoopFn turl
   ps <- newEmptyMVar
-  forkIO $ (getTrackerLoopFn turl) turl port peerId infohash fsChan (initialTState ps)
-  runStateT (msgHandler msgChannel) (initialTState ps)
+  _ <- forkIO $ fn turl port peerId infohash fsChan (initialTState ps)
+  _ <- runStateT (msgHandler msgChannel) (initialTState ps)
   return ()
-    where getTrackerLoopFn turl =
-            case getTrackerType turl of
+    where getTrackerLoopFn turl' =
+            case getTrackerType turl' of
               Http -> HT.trackerLoop
               Udp -> UT.trackerLoop
               _ -> error "Tracker Protocol unimplemented"
diff --git a/src/FuncTorrent/Tracker/Udp.hs b/src/FuncTorrent/Tracker/Udp.hs
index ae7ad1e..de99ce2 100644
--- a/src/FuncTorrent/Tracker/Udp.hs
+++ b/src/FuncTorrent/Tracker/Udp.hs
@@ -96,7 +96,7 @@ instance Binary UDPRequest where
     putWord32be 0
     putWord32be 10
     putWord16be $ fromIntegral port
-  put (ScrapeReq _ _ _) = undefined
+  put ScrapeReq {} = undefined
   get = undefined
 
 instance Binary UDPResponse where
@@ -189,7 +189,7 @@ getIPPortPairs = do
     ip <- toIP <$> getByteString 4
     port <- toPort <$> getByteString 2
     ipportpairs <- getIPPortPairs
-    return $ (Peer ip port) : ipportpairs
+    return $ Peer ip port : ipportpairs
 
 startSession :: String -> Port -> IO UDPTrackerHandle
 startSession host port = do
@@ -198,7 +198,7 @@ startSession host port = do
   let (SockAddrInet p ip) = addrAddress $ head addrinfos
   putStrLn "connected to tracker"
   return UDPTrackerHandle { sock = s
-                          , addr = (SockAddrInet (fromIntegral port) ip) }
+                          , addr = SockAddrInet (fromIntegral port) ip }
   
 closeSession :: UDPTrackerHandle -> IO ()
 closeSession (UDPTrackerHandle s _) = close s
@@ -229,5 +229,4 @@ trackerLoop url sport peerId infohash fschan tstate = forever $ do
       t1 <- connectRequest
       cid <- connectResponse t1
       t2 <- announceRequest cid infohash peerId (fromIntegral up) (fromIntegral down) (fromIntegral (left tstate)) (fromIntegral sport)
-      stats <- announceResponse t2
-      return stats
+      announceResponse t2
-- 
2.37.2