Minor changes

- Return of the newlines: Add all newlines once again
- Provide better comments
- Remove `sender`
- Consistently use set and get prefixed functions

ihaskell-display/ihaskell-aeson/IHaskell/Display/Aeson.hs

@@ -16,4 +16,4 @@ instance IHaskellDisplay Value where
   display renderable = return $ Display [plain json, html dom]
     where
       json = T.unpack $ E.decodeUtf8 $ LBS.toStrict $ encodePretty renderable
-      dom = [i|<div class="highlight-code" id="javascript">${json}</div>|]
\ No newline at end of file
+      dom = [i|<div class="highlight-code" id="javascript">${json}</div>|]

ihaskell-display/ihaskell-basic/IHaskell/Display/Basic.hs

@@ -16,4 +16,4 @@ instance Show a => IHaskellDisplay (Maybe a) where
           Nothing -> "<span style='color: red; font-weight: bold;'>Nothing</span>"
           Just x -> printf
                       "<span style='color: green; font-weight: bold;'>Just</span><span style='font-family: monospace;'>%s</span>"
-                      (show x)
\ No newline at end of file
+                      (show x)

ihaskell-display/ihaskell-blaze/IHaskell/Display/Blaze.hs

@@ -15,4 +15,4 @@ instance IHaskellDisplay (MarkupM a) where
     where
       str = renderMarkup (void val)
       stringDisplay = plain str
-      htmlDisplay = html str
\ No newline at end of file
+      htmlDisplay = html str

ihaskell-display/ihaskell-charts/IHaskell/Display/Charts.hs

@@ -46,4 +46,4 @@ chartData renderable format = do
 mkFile opts filename renderable = renderableToFile opts filename renderable
 #else
 mkFile opts filename renderable = renderableToFile opts renderable filename
-#endif
\ No newline at end of file
+#endif

ihaskell-display/ihaskell-diagrams/IHaskell/Display/Diagrams.hs

@@ -48,4 +48,4 @@ diagramData renderable format = do
 
 -- Rendering hint.
 diagram :: Diagram Cairo -> Diagram Cairo
-diagram = id
\ No newline at end of file
+diagram = id

ihaskell-display/ihaskell-diagrams/IHaskell/Display/Diagrams/Animation.hs

@@ -53,4 +53,4 @@ animationData renderable = do
 
 -- Rendering hint.
 animation :: Animation Cairo V2 Double -> Animation Cairo V2 Double
-animation = id
\ No newline at end of file
+animation = id

ihaskell-display/ihaskell-hatex/IHaskell/Display/Hatex.hs

@@ -12,4 +12,4 @@ instance IHaskellDisplay LaTeX where
   display = display . IHaskell.Display.latex . T.unpack . render
 
 instance (a ~ (), IO ~ io) => IHaskellDisplay (LaTeXT io a) where
-  display ma = display =<< execLaTeXT ma
\ No newline at end of file
+  display ma = display =<< execLaTeXT ma

ihaskell-display/ihaskell-juicypixels/IHaskell/Display/Juicypixels.hs

@@ -91,4 +91,4 @@ imWidthHeight (ImageCMYK8 im) = imWH im
 imWidthHeight (ImageCMYK16 im) = imWH im
 
 imWH :: Image a -> (Int, Int)
-imWH im = (imageWidth im, imageHeight im)
\ No newline at end of file
+imWH im = (imageWidth im, imageHeight im)

ihaskell-display/ihaskell-magic/IHaskell/Display/Magic.hs

@@ -71,4 +71,4 @@ data MagicClass = SVG
                 | HTML
                 | LaTeX
                 | Unknown
-  deriving Show
\ No newline at end of file
+  deriving Show

ihaskell-display/ihaskell-parsec/IHaskell/Display/Parsec.hs

@@ -49,4 +49,4 @@ instance Show a => IHaskellWidget (Parser a) where
     let key = "text" :: Text
         Just (String text) = Map.lookup key dict
         result = parse widget "<interactive>" $ T.unpack text
-    publisher $ toJSON result
\ No newline at end of file
+    publisher $ toJSON result

ihaskell-display/ihaskell-plot/IHaskell/Display/Plot.hs

@@ -40,4 +40,4 @@ figureData figure format = do
   where
     extension SVG = "svg"
     extension PNG = "png"
-    extension _ = ""
\ No newline at end of file
+    extension _ = ""

ihaskell-display/ihaskell-rlangqq/IHaskell/Display/Rlangqq.hs

@@ -103,4 +103,4 @@ displayInteraction (KnitImage cap img) = do
                         (H.unsafeByteStringValue
                            -- assumes you use the default device which is png
                            (Char.pack "data:image/png;base64," <> encoded))
-            <> caption
\ No newline at end of file
+            <> caption

ihaskell-display/ihaskell-static-canvas/src/IHaskell/Display/StaticCanvas.hs

@@ -29,4 +29,4 @@ instance IHaskellDisplay Canvas where
   display cnv = do
     name <- getUniqueName
     let script = buildScript' (width cnv) (height cnv) name (canvas cnv)
-    return $ Display [html $ unpack $ toLazyText script]
\ No newline at end of file
+    return $ Display [html $ unpack $ toLazyText script]

ihaskell-display/ihaskell-widgets/src/IHaskell/Display/Widgets.hs

 module IHaskell.Display.Widgets (module IHaskell.Display.Widgets.Button) where
 
-import           IHaskell.Display.Widgets.Button
\ No newline at end of file
+import           IHaskell.Display.Widgets.Button

ihaskell-display/ihaskell-widgets/src/IHaskell/Display/Widgets/Button.hs

@@ -12,14 +12,13 @@ module IHaskell.Display.Widgets.Button (
     setButtonStyle,
     setButtonLabel,
     setButtonTooltip,
-    disableButton,
-    enableButton,
+    setButtonStatus,
     toggleButtonStatus,
     -- * Get button properties
     getButtonStyle,
     getButtonLabel,
     getButtonTooltip,
-    isDisabled,
+    getButtonStatus,
     -- * Click handlers
     setClickHandler,
     getClickHandler,
@@ -43,15 +42,15 @@ import           IHaskell.Eval.Widgets
 import qualified IHaskell.IPython.Message.UUID as U
 import           IHaskell.Types (WidgetMethod(..))
 
--- | ADT for a button
+-- | A 'Button' represents a Button from IPython.html.widgets.
 data Button =
        Button
-         { uuid :: U.UUID
-         , description :: IORef Text
-         , tooltip :: IORef Text
-         , disabled :: IORef Bool
-         , buttonStyle :: IORef ButtonStyle
-         , clickHandler :: IORef (Button -> IO ())
+         { uuid :: U.UUID       -- ^ The UUID for the comm
+         , description :: IORef Text -- ^ The label displayed on the button
+         , tooltip :: IORef Text     -- ^ The tooltip shown on mouseover
+         , disabled :: IORef Bool    -- ^ Whether the button is disabled
+         , buttonStyle :: IORef ButtonStyle -- ^ The button_style
+         , clickHandler :: IORef (Button -> IO ()) -- ^ Function executed when button is clicked
          }
 
 -- | Pre-defined button-styles
@@ -67,15 +66,20 @@ data ButtonStyle = Primary
 mkButton :: IO Button
 mkButton = do
   -- Default properties, with a random uuid
-  uuid <- U.random
-  sender <- newIORef Nothing
-  desc <- newIORef "label"        -- Non-empty to get a display
+  commUUID <- U.random
+  desc <- newIORef "label"      -- Non-empty to get a display
   ttip <- newIORef ""
   dis <- newIORef False
   sty <- newIORef None
   fun <- newIORef (\_ -> return ())
 
-  let b = Button uuid desc ttip dis sty fun
+  let b = Button { uuid = commUUID
+                 , description = desc
+                 , tooltip = ttip
+                 , disabled = dis
+                 , buttonStyle = sty
+                 , clickHandler = fun
+                 }
 
   -- Open a comm for this widget, and store it in the kernel state
   widgetSendOpen b (toJSON ButtonInitData) (toJSON b)
@@ -83,9 +87,13 @@ mkButton = do
   -- Return the button widget
   return b
 
+-- | Send an update msg for a button, with custom json. Make it easy
+-- to update fragments of the state, by accepting a Pair instead of a
+-- Value.
 update :: Button -> [Pair] -> IO ()
 update b v = widgetSendUpdate b . toJSON . object $ v
 
+-- | Modify attributes of a button, stored inside it as IORefs
 modify :: Button -> (Button -> IORef a) -> a -> IO ()
 modify b attr val = writeIORef (attr b) val
 
@@ -107,17 +115,12 @@ setButtonTooltip b txt = do
   modify b tooltip txt
   update b ["tooltip" .= txt]
 
--- | Disable the button
-disableButton :: Button -> IO ()
-disableButton b = do
-  modify b disabled True
-  update b ["disabled" .= True]
-
--- | Enable the button
-enableButton :: Button -> IO ()
-enableButton b = do
-  modify b disabled False
-  update b ["disabled" .= False]
+-- | Set buttton status. True: Enabled, False: Disabled
+setButtonStatus :: Button -> Bool -> IO ()
+setButtonStatus b stat = do
+  let newStatus = not stat
+  modify b disabled newStatus
+  update b ["disabled" .= newStatus]
 
 -- | Toggle the button
 toggleButtonStatus :: Button -> IO ()
@@ -139,9 +142,9 @@ getButtonLabel = readIORef . description
 getButtonTooltip :: Button -> IO Text
 getButtonTooltip = readIORef . tooltip
 
--- | Check whether the button is disabled
-isDisabled :: Button -> IO Bool
-isDisabled = readIORef . disabled
+-- | Check whether the button is enabled / disabled
+getButtonStatus :: Button -> IO Bool
+getButtonStatus = not . readIORef . disabled
 
 -- | Set a function to be activated on click
 setClickHandler :: Button -> (Button -> IO ()) -> IO ()
@@ -207,4 +210,4 @@ instance IHaskellWidget Button where
     when (event == "click") $ triggerClick widget
 
 str :: String -> String
-str = id
\ No newline at end of file
+str = id

ipython-kernel/examples/Calc.hs

@@ -249,4 +249,4 @@ main = do
       putStrLn "Usage:"
       putStrLn "simple-calc-example setup        -- set up the profile"
       putStrLn
-        "simple-calc-example kernel FILE  -- run a kernel with FILE for communication with the frontend"
\ No newline at end of file
+        "simple-calc-example kernel FILE  -- run a kernel with FILE for communication with the frontend"

ipython-kernel/src/IHaskell/IPython/EasyKernel.hs

@@ -242,4 +242,4 @@ dupHeader :: MonadIO m => MessageHeader -> MessageType -> m MessageHeader
 dupHeader hdr mtype =
   do
     uuid <- liftIO UUID.random
-    return hdr { messageId = uuid, msgType = mtype }
\ No newline at end of file
+    return hdr { messageId = uuid, msgType = mtype }

ipython-kernel/src/IHaskell/IPython/Kernel.hs

@@ -6,4 +6,4 @@ import           IHaskell.IPython.Types as X
 import           IHaskell.IPython.Message.Writer as X
 import           IHaskell.IPython.Message.Parser as X
 import           IHaskell.IPython.Message.UUID as X
-import           IHaskell.IPython.ZeroMQ as X
\ No newline at end of file
+import           IHaskell.IPython.ZeroMQ as X

ipython-kernel/src/IHaskell/IPython/Message/Parser.hs

@@ -173,4 +173,4 @@ commCloseParser :: LByteString -> Message
 commCloseParser = requestParser $ \obj -> do
   uuid <- obj .: "comm_id"
   value <- obj .: "data"
-  return $ CommClose noHeader uuid value
\ No newline at end of file
+  return $ CommClose noHeader uuid value

ipython-kernel/src/IHaskell/IPython/Message/UUID.hs

@@ -37,4 +37,4 @@ instance FromJSON UUID where
 
 instance ToJSON UUID where
   -- Extract the string from the UUID.
-  toJSON (UUID str) = String $ pack str
\ No newline at end of file
+  toJSON (UUID str) = String $ pack str

ipython-kernel/src/IHaskell/IPython/Message/Writer.hs

@@ -129,4 +129,4 @@ ints :: [Int] -> [Int]
 ints = id
 
 string :: String -> String
-string = id
\ No newline at end of file
+string = id

ipython-kernel/src/IHaskell/IPython/Types.hs

@@ -477,4 +477,4 @@ instance Show MimeType where
   show (MimeJpg _ _) = "image/jpeg"
   show MimeSvg = "image/svg+xml"
   show MimeLatex = "text/latex"
-  show MimeJavascript = "application/javascript"
\ No newline at end of file
+  show MimeJavascript = "application/javascript"

ipython-kernel/src/IHaskell/IPython/ZeroMQ.hs

@@ -233,4 +233,4 @@ sendMessage debug hmacKey socket message = do
     idents = identifiers head
     metadata = "{}"
     content = encodeStrict message
-    headStr = encodeStrict head
\ No newline at end of file
+    headStr = encodeStrict head

src/IHaskell/BrokenPackages.hs

@@ -45,4 +45,4 @@ ident :: Parser String
 ident = many (alphaNum <|> oneOf "-.")
 
 dependency :: Parser String
-dependency = string "  dependency \"" *> ident <* string "\" doesn't exist\n"
\ No newline at end of file
+dependency = string "  dependency \"" *> ident <* string "\" doesn't exist\n"

src/IHaskell/Convert.hs

@@ -41,4 +41,4 @@ failIfExists :: FilePath -> IO ()
 failIfExists file = do
   exists <- doesFileExist file
   when exists $ fail $
-    printf "File %s already exists. To force supply --force." file
\ No newline at end of file
+    printf "File %s already exists. To force supply --force." file

src/IHaskell/Convert/Args.hs

@@ -107,4 +107,4 @@ fromExt s =
   case map toLower (takeExtension s) of
     ".lhs"   -> Just LhsMarkdown
     ".ipynb" -> Just IpynbFile
-    _        -> Nothing
\ No newline at end of file
+    _        -> Nothing

src/IHaskell/Convert/IpynbToLhs.hs

@@ -68,4 +68,4 @@ convOutputs sty array = do
 getTexts :: LT.Text -> Value -> Maybe LT.Text
 getTexts p (Object object)
   | Just (Array text) <- lookup "text" object = concatWithPrefix p text
-getTexts _ _ = Nothing
\ No newline at end of file
+getTexts _ _ = Nothing

src/IHaskell/Convert/LhsToIpynb.hs

@@ -119,4 +119,4 @@ classifyLines sty@(LhsStyle c o _ _ _ _) (l:ls) =
                         then Just ""
                         else Nothing
     dropSpace = LT.dropWhile isSpace
-classifyLines _ [] = []
\ No newline at end of file
+classifyLines _ [] = []

src/IHaskell/Display.hs

@@ -166,4 +166,4 @@ switchToTmpDir = void (try switchDir :: IO (Either SomeException ()))
   where
     switchDir =
       getTemporaryDirectory >>=
-      setCurrentDirectory
\ No newline at end of file
+      setCurrentDirectory

src/IHaskell/Eval/Completion.hs

@@ -339,4 +339,4 @@ completePathFilter includeFile includeDirectory left right = GhcMonad.liftIO $ d
           else str
       visible = filter (not . isHidden) suggestions
       hidden = filter isHidden suggestions
-  return $ visible ++ hidden
\ No newline at end of file
+  return $ visible ++ hidden

src/IHaskell/Eval/Evaluate.hs

@@ -1288,4 +1288,4 @@ displayError :: ErrMsg -> Display
 displayError msg = Display [plain . typeCleaner $ msg, html $ formatError msg]
 
 mono :: String -> String
-mono = printf "<span class='mono'>%s</span>"
\ No newline at end of file
+mono = printf "<span class='mono'>%s</span>"

src/IHaskell/Eval/Hoogle.hs

@@ -253,4 +253,4 @@ span :: String -> String -> String
 span = printf "<span class='%s'>%s</span>"
 
 link :: String -> String -> String
-link = printf "<a target='_blank' href='%s'>%s</a>"
\ No newline at end of file
+link = printf "<a target='_blank' href='%s'>%s</a>"

src/IHaskell/Eval/Info.hs

@@ -23,4 +23,4 @@ info name = ghandle handler $ do
   return $ typeCleaner $ showPpr dflags result
   where
     handler :: SomeException -> Interpreter String
-    handler _ = return ""
\ No newline at end of file
+    handler _ = return ""

src/IHaskell/Eval/Inspect.hs

@@ -53,4 +53,4 @@ inspect code pos = do
   response <- ghandle handler (Just <$> getType identifier)
   let prefix = identifier ++ " :: "
       fmt str = Display [plain $ prefix ++ str]
-  return $ fmt <$> response
\ No newline at end of file
+  return $ fmt <$> response

src/IHaskell/Eval/Lint.hs

@@ -224,4 +224,4 @@ showSuggestion = remove lintIdent . dropDo
 
     -- Ignore other list elements - just proceed onwards.
     clean (x:xs) = x : clean xs
-    clean [] = []
\ No newline at end of file
+    clean [] = []

src/IHaskell/Eval/ParseShell.hs

@@ -64,4 +64,4 @@ shellWords = try (eof *> return []) <|> do
                return $ x : xs
 
 parseShell :: String -> Either ParseError [String]
-parseShell string = parse shellWords "shell" (string ++ "\n")
\ No newline at end of file
+parseShell string = parse shellWords "shell" (string ++ "\n")

src/IHaskell/Eval/Parser.hs

@@ -295,4 +295,4 @@ getModuleName moduleSrc = do
       case unLoc <$> hsmodName (unLoc mod) of
         Nothing   -> error "Module must have a name."
         Just name -> return $ split "." $ moduleNameString name
-    otherwise -> error "getModuleName failed, output was neither Parsed nor Failure"
\ No newline at end of file
+    otherwise -> error "getModuleName failed, output was neither Parsed nor Failure"

src/IHaskell/Eval/Util.hs

@@ -393,4 +393,4 @@ getDescription str = do
     showFixity thing fixity =
       if fixity == GHC.defaultFixity
         then O.empty
-        else O.ppr fixity O.<+> pprInfixName (getName thing)
\ No newline at end of file
+        else O.ppr fixity O.<+> pprInfixName (getName thing)

src/IHaskell/Eval/Widgets.hs

@@ -142,4 +142,4 @@ widgetHandler :: (Message -> IO ())
 widgetHandler _ _ state [] = return state
 widgetHandler sender header state (x:xs) = do
   newState <- handleMessage sender header state x
-  widgetHandler sender header newState xs
\ No newline at end of file
+  widgetHandler sender header newState xs

src/IHaskell/Flags.hs

@@ -175,4 +175,4 @@ ihaskellArgs =
 
 noArgs = flagArg unexpected ""
   where
-    unexpected a = error $ "Unexpected argument: " ++ a
\ No newline at end of file
+    unexpected a = error $ "Unexpected argument: " ++ a

src/IHaskell/IPython.hs

@@ -262,4 +262,4 @@ getSandboxPackageConf = SH.shelly $ do
       case confdirs of
         [] -> return Nothing
         dir:_ ->
-          return $ Just dir
\ No newline at end of file
+          return $ Just dir

src/IHaskell/IPython/Stdin.hs

@@ -117,4 +117,4 @@ recordParentHeader dir header =
 
 recordKernelProfile :: String -> Profile -> IO ()
 recordKernelProfile dir profile =
-  writeFile (dir ++ "/.kernel-profile") $ show profile
\ No newline at end of file
+  writeFile (dir ++ "/.kernel-profile") $ show profile

src/IHaskell/Publish.hs

@@ -73,4 +73,4 @@ publishResult send replyHeader displayed updateNeeded pagerOutput usePager resul
 
     prependCss (DisplayData MimeHtml html) =
       DisplayData MimeHtml $ mconcat ["<style>", T.pack ihaskellCSS, "</style>", html]
-    prependCss x = x
\ No newline at end of file
+    prependCss x = x

src/IHaskell/Types.hs

@@ -229,4 +229,4 @@ dupHeader :: MessageHeader -> MessageType -> IO MessageHeader
 dupHeader header messageType = do
   uuid <- liftIO random
 
-  return header { messageId = uuid, msgType = messageType }
\ No newline at end of file
+  return header { messageId = uuid, msgType = messageType }

src/IHaskellPrelude.hs

@@ -147,3 +147,4 @@ putChar = liftIO . P.putChar
 
 print :: (MonadIO m, Show a) => a -> m ()
 print = liftIO . P.print
+

src/StringUtils.hs

@@ -23,4 +23,4 @@ replace needle replacement haystack =
   T.unpack $ T.replace (T.pack needle) (T.pack replacement) (T.pack haystack)
 
 split :: String -> String -> [String]
-split delim = map T.unpack . T.splitOn (T.pack delim) . T.pack
\ No newline at end of file
+split delim = map T.unpack . T.splitOn (T.pack delim) . T.pack