change filelocation, edit readme

app/Main.hs

@@ -1,61 +1,67 @@
 module Main where
 
-import Control.Monad
 import Control.Exception
-import System.IO
-import System.Directory
-import Network.HTTP.Client
-import Network.HTTP.Simple
-import Network.URI
+import Control.Monad
 import qualified Data.ByteString.Char8 as B8
 import GHC.IO.Encoding (setLocaleEncoding)
 import Lib
+import Network.HTTP.Client
+import Network.HTTP.Simple
+import Network.URI
+import System.Directory
+import System.FilePath
+import System.IO
 
 main :: IO ()
 main = do
-    setLocaleEncoding utf8
-    forever $ do 
-        line <-  getLine 
-        dispatch line
+  setLocaleEncoding utf8
+  createDirectoryIfMissing False =<< workingDir
+  join $ (writeFile <$> fileName) <*> pure ""
+  forever $ do
+    line <- getLine
+    dispatch line
 
 dispatch :: String -> IO ()
-dispatch ('T':'I':'T':'L':'E':':':title) = writeToFile title 0
-dispatch ('A':'R':'T':'I':'S':'T':':':artist) = writeToFile artist 1
-dispatch ('A':'L':'B':'U':'M':':':album) = writeToFile album 2
-dispatch ('C':'O':'V':'E':'R':':':cover) = handleCover cover
-dispatch _ =  return () 
-
-
-
-
-writeToFile:: String -> Int  -> IO()
-writeToFile text position= do  
-    contents <- lines <$> readFile filename
-    let newContent = unlines $ take position contents ++ [text] ++ drop (position+1) contents
-    bracketOnError (openTempFile "." "temp") 
-        (\(tempName,tempHandle) -> do
-            hClose tempHandle
-            removeFile tempName)
-        (\(tempName,tempHandle) -> do
-            hPutStr tempHandle newContent
-            hClose tempHandle
-            renameFile tempName filename)
+dispatch ('T' : 'I' : 'T' : 'L' : 'E' : ':' : title) = writeToFile title 0
+dispatch ('A' : 'R' : 'T' : 'I' : 'S' : 'T' : ':' : artist) = writeToFile artist 1
+dispatch ('A' : 'L' : 'B' : 'U' : 'M' : ':' : album) = writeToFile album 2
+dispatch ('C' : 'O' : 'V' : 'E' : 'R' : ':' : cover) = handleCover cover
+dispatch _ = return ()
 
+writeToFile :: String -> Int -> IO ()
+writeToFile text position = do
+  contents <- lines <$> (readFile =<< fileName)
+  let newContent = unlines $ take position contents ++ [text] ++ drop (position + 1) contents
+  bracketOnError
+    (openTempFile "." "temp")
+    ( \(tempName, tempHandle) -> do
+        hClose tempHandle
+        removeFile tempName
+    )
+    ( \(tempName, tempHandle) -> do
+        hPutStr tempHandle newContent
+        hClose tempHandle
+        renameFile tempName =<< fileName
+    )
 
 handleCover :: String -> IO ()
-handleCover url= do
-        contents <- lines <$> readFile filename
-        when ((contents !! 3 ) /= url && url /= "") $ do
-            writeToFile (url) 3
-            request <- parseRequest url
-            let fileName = Prelude.last . pathSegments . getUri $ request
-            resp <- httpBS request
-            B8.writeFile coverName  $ getResponseBody resp
+handleCover url = do
+  contents <- lines <$> (readFile =<< fileName)
+  if length contents > 3 && (contents !! 3) /= url && url /= ""
+    then do
+      writeToFile url 3
+      request <- parseRequest url
+      let coverFileName = Prelude.last . pathSegments . getUri $ request
+      join $ B8.writeFile <$> coverName <*> (getResponseBody <$> httpBS request)
+    else writeToFile url 3
 
+-- B8.writeFile coverName $ getResponseBody resp
 
-filename :: FilePath 
-filename= "wnpClient.txt"
+fileName :: IO FilePath
+fileName = (</> "wnpClient.txt") <$> workingDir
 
+coverName :: IO FilePath
+coverName = (</> "cover.jpg") <$> workingDir
 
-coverName :: FilePath 
-coverName="cover.jpg"
+workingDir :: IO FilePath
+workingDir = (</> ".wnpClient") <$> getHomeDirectory