wip: switching from ncurses to brick

app/Main.hs

@@ -21,10 +21,11 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 module Main where
 
-import Control.Monad.Trans.State (evalStateT)
+import Brick.Main (defaultMain)
-import UI.NCurses (runCurses)
+import Control.Monad (void)
 
 import Mtlstats
+import Mtlstats.Types
 
 main :: IO ()
-main = runCurses $ initState >>= evalStateT mainLoop
+main = void $ defaultMain app newProgState

package.yaml

@@ -20,17 +20,19 @@ description:         Please see the README on GitHub at <https://github.com/mtls
 
 dependencies:
 - base >= 4.7 && < 5
-- aeson >= 1.4.4.0 && < 1.5
+- aeson >= 2.0.3.0 && < 2.1
+- bytestring >= 0.11.4.0 && < 0.12
+- brick >= 1.4 && < 1.5
 - containers >= 0.6.0.1 && < 0.7
 - easy-file >= 0.2.2 && < 0.3
-- extra >= 1.6.17 && < 1.7
+- extra >= 1.7.13 && < 1.8
+- microlens >= 0.4.12.0 && < 0.5
+- microlens-mtl >= 0.2.0.3 && < 0.3
 - microlens-th >= 0.4.2.3 && < 0.5
-- ncurses >= 0.2.16 && < 0.3
+- mtl >= 2.2.2 && < 2.3
-- random >= 1.1 && < 1.2
+- random >= 1.2.1.1 && < 1.3
-- time >= 1.8.0.2 && < 1.9
+- time >= 1.11.1.1 && < 1.12
-- transformers >= 0.5.6.2 && < 0.6
+- vty >= 5.37 && < 5.38
-- bytestring
-- microlens
 
 ghc-options:
   - -Wall
@@ -60,5 +62,5 @@ tests:
     - -with-rtsopts=-N
     dependencies:
     - mtlstats
-    - hspec >= 2.7.1 && < 2.8
+    - hspec >= 2.9.7 && < 2.10
     - unordered-containers

src/Mtlstats.hs

@@ -19,40 +19,34 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 -}
 
-module Mtlstats (initState, mainLoop) where
+module Mtlstats (app) where
 
-import Control.Monad (void)
+import Brick.AttrMap (AttrMap, forceAttrMap)
-import Control.Monad.Extra (whenM)
+import Brick.Main (App (..), showFirstCursor)
-import Control.Monad.Trans.Class (lift)
+import Brick.Util (on)
-import Control.Monad.Trans.State (get, gets)
+import Graphics.Vty.Attributes.Color (blue, white)
-import Data.Maybe (fromJust)
+import Lens.Micro (to)
-import qualified UI.NCurses as C
+import Lens.Micro.Mtl (use)
 
 import Mtlstats.Control
 import Mtlstats.Types
 
--- | Initializes the progran
+-- | The main application
-initState :: C.Curses ProgState
+app :: App ProgState () ()
-initState = do
+app = App
-  C.setEcho False
+  { appDraw         = \s -> [drawController (dispatch s) s]
-  void $ C.setCursorMode C.CursorInvisible
+  , appChooseCursor = showFirstCursor
-  return newProgState
+  , appHandleEvent  = handler
+  , appStartEvent   = return ()
+  , appAttrMap      = const myAttrMap
+  }
 
--- | Main program loop
+handler :: Handler ()
-mainLoop :: Action ()
+handler e = do
-mainLoop = do
+  c <- use (to dispatch)
-  c <- gets dispatch
+  handleController c e
-  get >>= lift . draw . drawController c
-  w <- lift C.defaultWindow
-  whenM (lift (fromJust <$> C.getEvent w Nothing) >>= handleController c)
-    mainLoop
 
-draw :: C.Update C.CursorMode -> C.Curses ()
+myAttrMap :: AttrMap
-draw u = do
+myAttrMap = forceAttrMap (white `on` blue)
-  void $ C.setCursorMode C.CursorInvisible
+
-  w  <- C.defaultWindow
+--jl
-  cm <- C.updateWindow w $ do
-    C.clear
-    u
-  C.render
-  void $ C.setCursorMode cm

src/Mtlstats/Actions.hs

@@ -41,18 +41,18 @@ module Mtlstats.Actions
   , resetCreatePlayerState
   , resetCreateGoalieState
   , backHome
-  , scrollUp
-  , scrollDown
   , loadDatabase
   , saveDatabase
   ) where
 
+import Brick.Main (viewportScroll)
 import Control.Exception (IOException, catch)
 import Control.Monad.IO.Class (liftIO)
-import Control.Monad.Trans.State (gets, modify)
+import Control.Monad.State.Class (modify)
 import Data.Aeson (decodeFileStrict, encodeFile)
 import Data.Maybe (fromMaybe)
 import Lens.Micro ((^.), (&), (.~), (%~))
+import Lens.Micro.Mtl ((.=), use)
 import System.EasyFile
   ( createDirectoryIfMissing
   , getAppUserDataDirectory
@@ -206,17 +206,9 @@ resetCreateGoalieState = progMode.createGoalieStateL
 -- | Resets the program state back to the main menu
 backHome :: ProgState -> ProgState
 backHome
-  = (progMode     .~ MainMenu)
+  = (progMode    .~ MainMenu)
-  . (inputBuffer  .~ "")
+  . (inputBuffer .~ "")
-  . (scrollOffset .~ 0)
+  . (scroller    .~ viewportScroll ())
-
--- | Scrolls the display up
-scrollUp :: ProgState -> ProgState
-scrollUp = scrollOffset %~ max 0 . pred
-
--- | Scrolls the display down
-scrollDown :: ProgState -> ProgState
-scrollDown = scrollOffset %~ succ
 
 -- | Loads the database
 loadDatabase :: Action ()
@@ -226,18 +218,18 @@ loadDatabase = do
     (catch
       (decodeFileStrict dbFile)
       (\(_ :: IOException) -> return Nothing))
-    >>= mapM_ (modify . (database .~))
+    >>= mapM_ (database .=)
 
 -- | Saves the database
 saveDatabase :: Action ()
 saveDatabase = do
-  db     <- gets (^.database)
+  db     <- use database
   dbFile <- dbSetup
   liftIO $ encodeFile dbFile db
 
 dbSetup :: Action String
 dbSetup = do
-  fn <- gets (^.dbName)
+  fn <- use dbName
   liftIO $ do
     dir <- getAppUserDataDirectory appName
     createDirectoryIfMissing True dir

src/Mtlstats/Control/CreateGoalie.hs

@@ -21,15 +21,16 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 module Mtlstats.Control.CreateGoalie (createGoalieC) where
 
-import Control.Monad.Trans.State (gets, modify)
+import Brick.Widgets.Core (str)
+import Control.Monad.State.Class (gets, modify)
 import Lens.Micro ((^.), (.~), (?~), (%~), to)
-import qualified UI.NCurses as C
 
 import Mtlstats.Actions
 import Mtlstats.Format
 import Mtlstats.Handlers
 import Mtlstats.Prompt
 import Mtlstats.Types
+import Mtlstats.Util
 
 -- | Handles goalie creation
 createGoalieC :: CreateGoalieState -> Controller
@@ -48,33 +49,28 @@ getGoalieNameC = promptController goalieNamePrompt
 
 getRookieFlagC :: Controller
 getRookieFlagC = Controller
-  { drawController = const $ do
+  { drawController = const $
-    C.drawString "Is this goalie a rookie? (Y/N)"
+    str "Is this goalie a rookie? (Y/N)"
-    return C.CursorInvisible
+  , handleController = \e ->
-  , handleController = \e -> do
     modify $ case ynHandler e of
       Just True -> progMode.createGoalieStateL
         %~ (cgsRookieFlag ?~ True)
         .  (cgsActiveFlag ?~ True)
       rf -> progMode.createGoalieStateL.cgsRookieFlag .~ rf
-    return True
   }
 
 getActiveFlagC :: Controller
 getActiveFlagC = Controller
-  { drawController = const $ do
+  { drawController = const $ str "Is this goalie active? (Y/N)"
-    C.drawString "Is this goalie active? (Y/N)"
+  , handleController = \e ->
-    return C.CursorInvisible
-  , handleController = \e -> do
     modify $ progMode.createGoalieStateL.cgsActiveFlag .~ ynHandler e
-    return True
   }
 
 confirmCreateGoalieC :: Controller
 confirmCreateGoalieC = Controller
-  { drawController = \s -> do
+  { drawController = \s -> let
-    let cgs = s^.progMode.createGoalieStateL
+    cgs = s^.progMode.createGoalieStateL
-    C.drawString $ unlines
+    in linesToWidget
       $  labelTable
          [ ( "Goalie number", maybe "?" show $ cgs^.cgsNumber     )
          , ( "Goalie name",   cgs^.cgsName                        )
@@ -84,7 +80,6 @@ confirmCreateGoalieC = Controller
       ++ [ ""
          , "Create goalie: are you sure?  (Y/N)"
          ]
-    return C.CursorInvisible
   , handleController = \e -> do
     cgs <- gets (^.progMode.createGoalieStateL)
     let
@@ -103,5 +98,4 @@ confirmCreateGoalieC = Controller
             .  (egsCallback       .~ success)
       Just False -> failure
       Nothing    -> return ()
-    return True
   }

src/Mtlstats/Control/CreatePlayer.hs

@@ -21,15 +21,16 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 module Mtlstats.Control.CreatePlayer (createPlayerC) where
 
-import Control.Monad.Trans.State (gets, modify)
+import Brick.Widgets.Core (str)
+import Control.Monad.State.Class (gets, modify)
 import Lens.Micro ((^.), (.~), (?~), (%~), to)
-import qualified UI.NCurses as C
 
 import Mtlstats.Actions
 import Mtlstats.Format
 import Mtlstats.Handlers
 import Mtlstats.Prompt
 import Mtlstats.Types
+import Mtlstats.Util
 
 -- | Handles player creation
 createPlayerC :: CreatePlayerState -> Controller
@@ -52,33 +53,26 @@ getPlayerPosC = promptController playerPosPrompt
 
 getRookieFlagC :: Controller
 getRookieFlagC = Controller
-  { drawController = const $ do
+  { drawController = const $ str "Is this player a rookie? (Y/N)"
-    C.drawString "Is this player a rookie? (Y/N)"
+  , handleController = \e ->
-    return C.CursorInvisible
-  , handleController = \e -> do
     modify $ case ynHandler e of
       Just True -> progMode.createPlayerStateL
         %~ (cpsRookieFlag ?~ True)
         .  (cpsActiveFlag ?~ True)
       rf -> progMode.createPlayerStateL.cpsRookieFlag .~ rf
-    return True
   }
 
 getActiveFlagC :: Controller
 getActiveFlagC = Controller
-  { drawController = const $ do
+  { drawController = const $ str "Is the player active? (Y/N)"
-    C.drawString "Is the player active? (Y/N)"
+  , handleController = \e ->
-    return C.CursorInvisible
-  , handleController = \e -> do
     modify $ progMode.createPlayerStateL.cpsActiveFlag .~ ynHandler e
-    return True
   }
 
 confirmCreatePlayerC :: Controller
 confirmCreatePlayerC = Controller
-  { drawController = \s -> do
+  { drawController = \s -> let cps = s^.progMode.createPlayerStateL
-    let cps = s^.progMode.createPlayerStateL
+    in linesToWidget
-    C.drawString $ unlines
       $  labelTable
          [ ( "Player number",   maybe "?" show $ cps^.cpsNumber     )
          , ( "Player name",     cps^.cpsName                        )
@@ -89,7 +83,6 @@ confirmCreatePlayerC = Controller
       ++ [ ""
          , "Create player: are you sure?  (Y/N)"
          ]
-    return C.CursorInvisible
   , handleController = \e -> do
     cps <- gets (^.progMode.createPlayerStateL)
     let
@@ -108,5 +101,4 @@ confirmCreatePlayerC = Controller
             .  (epsCallback       .~ success)
       Just False -> failure
       Nothing -> return ()
-    return True
   }

src/Mtlstats/Control/EditGoalie.hs

@@ -23,10 +23,11 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 module Mtlstats.Control.EditGoalie (editGoalieC) where
 
-import Control.Monad.Trans.State (gets, modify)
+import Brick.Types (Widget)
+import Brick.Widgets.Core (str, vBox)
+import Control.Monad.State.Class (gets, modify)
 import Data.Maybe (fromMaybe)
 import Lens.Micro ((^.), (.~), (%~))
-import UI.NCurses as C
 
 import Mtlstats.Actions
 import Mtlstats.Handlers
@@ -90,33 +91,19 @@ lifetimeMenuC _ = menuControllerWith header editGoalieLtMenu
 deleteC :: Action () -> Controller
 deleteC _ = Controller
 
-  { drawController = \s -> do
+  { drawController = \s -> let
-
+    hdr = fromMaybe "" $ do
-    C.drawString $ let
+      gid    <- s^.progMode.editGoalieStateL.egsSelectedGoalie
-
+      goalie <- nth gid $ s^.database.dbGoalies
-      hdr = fromMaybe [] $ do
+      Just $ "Goalie: " ++ goalieDetails goalie ++ "\n\n"
-        gid    <- s^.progMode.editGoalieStateL.egsSelectedGoalie
+    in str $ hdr ++ "Are you sure you want to delete this goalie? (Y/N)"
-        goalie <- nth gid $ s^.database.dbGoalies
+  , handleController = \e -> case ynHandler e of
-        Just $ "Goalie: " ++ goalieDetails goalie ++ "\n\n"
+    Just True -> do
-
+      gets (^.progMode.editGoalieStateL.egsSelectedGoalie) >>= mapM_
-      in hdr ++ "Are you sure you want to delete this goalie? (Y/N)"
+        (\gid -> modify $ database.dbGoalies %~ dropNth gid)
-
+      modify edit
-    return C.CursorInvisible
+    Just False -> modify $ progMode.editGoalieStateL.egsMode .~ EGMenu
-
+    Nothing    -> return ()
-  , handleController = \e -> do
-
-    case ynHandler e of
-
-      Just True -> do
-        gets (^.progMode.editGoalieStateL.egsSelectedGoalie) >>= mapM_
-          (\gid -> modify $ database.dbGoalies %~ dropNth gid)
-        modify edit
-
-      Just False -> modify $ progMode.editGoalieStateL.egsMode .~ EGMenu
-      Nothing    -> return ()
-
-    return True
-
   }
 
 ytdGamesC :: Bool -> Action () -> Controller
@@ -173,8 +160,11 @@ ltLossesC = curry $ promptController .
 ltTiesC :: Action () -> Controller
 ltTiesC = promptController . editGoalieLtTiesPrompt
 
-header :: ProgState -> C.Update ()
+header :: ProgState -> Widget () -> Widget ()
-header s = C.drawString $ fromMaybe "" $ do
+header s w = vBox
-  gid <- s^.progMode.editGoalieStateL.egsSelectedGoalie
+  [ str $ fromMaybe "" $ do
-  g   <- nth gid $ s^.database.dbGoalies
+    gid <- s^.progMode.editGoalieStateL.egsSelectedGoalie
-  Just $ goalieDetails g ++ "\n"
+    g   <- nth gid $ s^.database.dbGoalies
+    Just $ goalieDetails g
+  , w
+  ]

src/Mtlstats/Control/EditPlayer.hs

@@ -21,10 +21,11 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 module Mtlstats.Control.EditPlayer (editPlayerC) where
 
-import Control.Monad.Trans.State (gets, modify)
+import Brick.Types (Widget)
+import Brick.Widgets.Core (emptyWidget, str, vBox)
+import Control.Monad.State.Class (gets, modify)
 import Data.Maybe (fromMaybe)
 import Lens.Micro ((^.), (.~), (%~))
-import qualified UI.NCurses as C
 
 import Mtlstats.Actions
 import Mtlstats.Handlers
@@ -81,33 +82,19 @@ lifetimeC _ = menuControllerWith header editPlayerLtMenu
 deleteC :: Action () -> Controller
 deleteC _ = Controller
 
-  { drawController = \s -> do
+  { drawController = \s -> let
-
+    hdr = fromMaybe [] $ do
-    C.drawString $ let
+      pid    <- s^.progMode.editPlayerStateL.epsSelectedPlayer
-
+      player <- nth pid $ s^.database.dbPlayers
-      hdr = fromMaybe [] $ do
+      Just $ "Player: " ++ playerDetails player ++ "\n"
-        pid    <- s^.progMode.editPlayerStateL.epsSelectedPlayer
+    in str $ hdr ++ "Are you sure you want to delete this player? (Y/N)"
-        player <- nth pid $ s^.database.dbPlayers
+  , handleController = \e -> case ynHandler e of
-        Just $ "Player: " ++ playerDetails player ++ "\n\n"
+    Just True -> do
-
+      gets (^.progMode.editPlayerStateL.epsSelectedPlayer) >>= mapM_
-      in hdr ++ "Are you sure you want to delete this player? (Y/N)"
+        (\pid -> modify $ database.dbPlayers %~ dropNth pid)
-
+      modify edit
-    return C.CursorInvisible
+    Just False -> modify $ progMode.editPlayerStateL.epsMode .~ EPMenu
-
+    Nothing    -> return ()
-  , handleController = \e -> do
-
-    case ynHandler e of
-
-      Just True -> do
-        gets (^.progMode.editPlayerStateL.epsSelectedPlayer) >>= mapM_
-          (\pid -> modify $ database.dbPlayers %~ dropNth pid)
-        modify edit
-
-      Just False -> modify $ progMode.editPlayerStateL.epsMode .~ EPMenu
-      Nothing    -> return ()
-
-    return True
-
   }
 
 ytdGoalsC :: Bool -> Action () -> Controller
@@ -132,8 +119,11 @@ ltAssistsC batchMode callback = promptController $
 ltPMinC :: Action () -> Controller
 ltPMinC = promptController . editPlayerLtPMinPrompt
 
-header :: ProgState -> C.Update ()
+header :: ProgState -> Widget () -> Widget ()
-header s = C.drawString $ fromMaybe "" $ do
+header s w = vBox
-  pid    <- s^.progMode.editPlayerStateL.epsSelectedPlayer
+  [ fromMaybe emptyWidget $ do
-  player <- nth pid $ s^.database.dbPlayers
+    pid    <- s^.progMode.editPlayerStateL.epsSelectedPlayer
-  Just $ playerDetails player ++ "\n"
+    player <- nth pid $ s^.database.dbPlayers
+    Just $ str $ playerDetails player
+  , w
+  ]

src/Mtlstats/Control/EditStandings.hs

@@ -23,8 +23,9 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 module Mtlstats.Control.EditStandings (editStandingsC) where
 
+import Brick.Types (Widget)
+import Brick.Widgets.Core (str, vBox)
 import Lens.Micro ((^.))
-import qualified UI.NCurses as C
 
 import Mtlstats.Format
 import Mtlstats.Menu
@@ -65,17 +66,16 @@ menuC = menuControllerWith header
 promptC :: Prompt -> Controller
 promptC = promptControllerWith header
 
-header :: ProgState -> C.Update ()
+header :: ProgState -> Widget () -> Widget ()
-header = do
+header s w = let
-  db <- (^.database)
+  db    = s^.database
-  let
+  home  = db^.dbHomeGameStats
-    home  = db^.dbHomeGameStats
+  away  = db^.dbAwayGameStats
-    away  = db^.dbAwayGameStats
+  table  = numTable ["   W", "   L", "  OT", "  GF", "  GA"]
-    table = numTable ["   W", "   L", "  OT", "  GF", "  GA"]
       [ ( "HOME", valsFor home )
       , ( "ROAD", valsFor away )
       ]
-  return $ C.drawString $ unlines $ table ++ [""]
+  in vBox $ map str (table ++ [""]) ++ [w]
 
 valsFor :: GameStats -> [Int]
 valsFor gs =

src/Mtlstats/Control/NewGame.hs

@@ -21,11 +21,23 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 module Mtlstats.Control.NewGame (newGameC) where
 
+import Brick.Main (vScrollBy, vScrollToBeginning)
+import Brick.Types
+  ( BrickEvent (VtyEvent)
+  , ViewportType (Vertical)
+  , Widget
+  )
+import Brick.Widgets.Center (hCenter)
+import Brick.Widgets.Core (str, vBox, viewport)
 import Control.Monad.IO.Class (liftIO)
-import Control.Monad.Trans.State (get, gets, modify)
+import Control.Monad.State.Class (get, gets, modify)
 import Data.Maybe (fromJust, fromMaybe, isJust)
+import Graphics.Vty.Input.Events
+  ( Event (EvKey)
+  , Key (KDown, KHome, KEnter, KUp)
+  )
 import Lens.Micro ((^.), (.~))
-import qualified UI.NCurses as C
+import Lens.Micro.Mtl (use)
 
 import Mtlstats.Actions
 import Mtlstats.Actions.NewGame
@@ -81,32 +93,30 @@ awayScoreC = promptControllerWith header awayScorePrompt
 
 overtimeFlagC :: Controller
 overtimeFlagC = Controller
-  { drawController = \s -> do
+  { drawController = \s -> header s $
-    header s
+    str "Did the game go into overtime?  (Y/N)"
-    C.drawString "Did the game go into overtime?  (Y/N)"
+  , handleController = \e ->
-    return C.CursorInvisible
-  , handleController = \e -> do
     modify $ progMode.gameStateL.overtimeFlag .~ ynHandler e
-    return True
   }
 
 verifyDataC :: Controller
 verifyDataC = Controller
-  { drawController = \s -> do
+  { drawController = \s -> let
-    let gs = s^.progMode.gameStateL
+    gs = s^.progMode.gameStateL
-    header s
+    in header s $ vBox $ map str $
-    C.drawString "\n"
+    [""] ++
-    C.drawString $ unlines $ labelTable
+    labelTable
       [ ( "Date",       gameDate gs                        )
       , ( "Game type",  show $ fromJust $ gs^.gameType     )
       , ( "Other team", gs^.otherTeam                      )
       , ( "Home score", show $ fromJust $ gs^.homeScore    )
       , ( "Away score", show $ fromJust $ gs^.awayScore    )
       , ( "Overtime",   show $ fromJust $ gs^.overtimeFlag )
-      ]
+      ] ++
-    C.drawString "\nIs the above information correct?  (Y/N)"
+    [ ""
-    return C.CursorInvisible
+    , "Is the above information correct?  (Y/N)"
-  , handleController = \e -> do
+    ]
+  , handleController = \e ->
     case ynHandler e of
       Just True  -> modify
         $ (progMode.gameStateL.dataVerified .~ True)
@@ -114,7 +124,6 @@ verifyDataC = Controller
         . awardShutouts
       Just False -> modify $ progMode.gameStateL .~ newGameState
       Nothing    -> return ()
-    return True
   }
 
 goalInput :: GameState -> Controller
@@ -131,7 +140,6 @@ recordGoalC = Controller
   , handleController = \e -> do
     (game, goal) <- gets gameGoal
     promptHandler (recordGoalPrompt game goal) e
-    return True
   }
 
 recordAssistC :: Controller
@@ -142,114 +150,97 @@ recordAssistC = Controller
   , handleController = \e -> do
     (game, goal, assist) <- gets gameGoalAssist
     promptHandler (recordAssistPrompt game goal assist) e
-    return True
   }
 
 confirmGoalDataC :: Controller
 confirmGoalDataC = Controller
-  { drawController = \s -> do
+  { drawController = \s -> let
-    let
+    (game, goal) = gameGoal s
-      (game, goal) = gameGoal s
+    gs           = s^.progMode.gameStateL
-      gs           = s^.progMode.gameStateL
+    players      = s^.database.dbPlayers
-      players      = s^.database.dbPlayers
+    msg          =
-      msg          = unlines $
+      [ "          Game: " ++ padNum 2 game
-        [ "          Game: " ++ padNum 2 game
+      , "          Goal: " ++ show goal
-        , "          Goal: " ++ show goal
+      , "Goal scored by: " ++
-        , "Goal scored by: " ++
+        playerSummary (fromJust $ gs^.goalBy >>= flip nth players)
-          playerSummary (fromJust $ gs^.goalBy >>= flip nth players)
+      ] ++
-        ] ++
+      map
-        map
+        ( \pid -> "   Assisted by: " ++
-          (\pid -> "   Assisted by: " ++
+          playerSummary (fromJust $ nth pid players)
-            playerSummary (fromJust $ nth pid players))
+        )
-          (gs^.assistsBy) ++
+        (gs^.assistsBy) ++
-        [ ""
+      [ ""
-        , "Is the above information correct? (Y/N)"
+      , "Is the above information correct? (Y/N)"
-        ]
+      ]
-    C.drawString msg
+    in vBox $ map str msg
-    return C.CursorInvisible
   , handleController = \e -> do
     case ynHandler e of
       Just True  -> modify recordGoalAssists
       Just False -> modify resetGoalData
       Nothing    -> return ()
-    return True
   }
 
 pMinPlayerC :: Controller
 pMinPlayerC = Controller
-  { drawController = \s -> do
+  { drawController = \s -> header s $
-    header s
     drawPrompt pMinPlayerPrompt s
-  , handleController = \e -> do
+  , handleController = promptHandler pMinPlayerPrompt
-    promptHandler pMinPlayerPrompt e
-    return True
   }
 
 getPMinsC :: Controller
 getPMinsC = Controller
-  { drawController = \s -> do
+  { drawController = \s ->  header s $ vBox
-    header s
+    [ str $ fromMaybe "" $ do
-    C.drawString $ fromMaybe "" $ do
       pid    <- s^.progMode.gameStateL.gameSelectedPlayer
       player <- nth pid $ s^.database.dbPlayers
-      Just $ playerSummary player ++ "\n"
+      Just $ playerSummary player
-    drawPrompt assignPMinsPrompt s
+    , drawPrompt assignPMinsPrompt s
-  , handleController = \e -> do
+    ]
-    promptHandler assignPMinsPrompt e
+  , handleController = promptHandler assignPMinsPrompt
-    return True
   }
 
 reportC :: Controller
 reportC = Controller
-  { drawController = \s -> do
+  { drawController = viewport () Vertical . hCenter . vBox . map str .
-    (rows, cols) <- C.windowSize
+    displayReport reportCols
-    C.drawString $ unlines $ slice
-      (s^.scrollOffset)
-      (fromInteger $ pred rows)
-      (displayReport (fromInteger $ pred cols) s)
-    return C.CursorInvisible
   , handleController = \e -> do
+    scr <- use scroller
     case e of
-      C.EventSpecialKey C.KeyUpArrow   -> modify scrollUp
+      VtyEvent (EvKey k []) -> case k of
-      C.EventSpecialKey C.KeyDownArrow -> modify scrollDown
+        KUp    -> vScrollBy scr (-1)
-      C.EventSpecialKey C.KeyHome      -> modify $ scrollOffset .~ 0
+        KDown  -> vScrollBy scr 1
-
+        KHome  -> vScrollToBeginning scr
-      C.EventCharacter '\n' -> do
+        KEnter -> do
-        get >>= liftIO . writeFile reportFilename . exportReport reportCols
+          get >>= liftIO . writeFile reportFilename . exportReport reportCols
-        modify backHome
+          modify backHome
-
+        _ -> return ()
       _ -> return ()
-    return True
   }
 
-header :: ProgState -> C.Update ()
+header :: ProgState -> Widget () -> Widget ()
-header s = C.drawString $
+header s w = vBox
-  "*** GAME " ++ padNum 2 (s^.database.dbGames) ++ " ***\n"
+  [ str $ "*** GAME " ++ padNum 2 (s^.database.dbGames) ++ " ***\n"
+  , w
+  ]
 
-monthHeader :: ProgState -> C.Update ()
+monthHeader :: ProgState -> Widget () -> Widget ()
-monthHeader s = do
+monthHeader s w = let 
-  (_, cols) <- C.windowSize
+  table = labelTable $ zip (map show ([1..] :: [Int]))
-  header s
+    [ "JANUARY"
-
+    , "FEBRUARY"
-  let
+    , "MARCH"
-    table = labelTable $ zip (map show ([1..] :: [Int]))
+    , "APRIL"
-      [ "JANUARY"
+    , "MAY"
-      , "FEBRUARY"
+    , "JUNE"
-      , "MARCH"
+    , "JULY"
-      , "APRIL"
+    , "AUGUST"
-      , "MAY"
+    , "SEPTEMBER"
-      , "JUNE"
+    , "OCTOBER"
-      , "JULY"
+    , "NOVEMBER"
-      , "AUGUST"
+    , "DECEMBER"
-      , "SEPTEMBER"
+    ]
-      , "OCTOBER"
+  in header s $ vBox $ map (hCenter . str)
-      , "NOVEMBER"
+    (["MONTH:", ""] ++ table ++ [""]) ++ [w]
-      , "DECEMBER"
-      ]
-
-  C.drawString $ unlines $
-    map (centre $ fromIntegral $ pred cols) $
-      ["MONTH:", ""] ++ table ++ [""]
 
 gameGoal :: ProgState -> (Int, Int)
 gameGoal s =

src/Mtlstats/Control/NewGame/GoalieInput.hs

@@ -21,9 +21,10 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 module Mtlstats.Control.NewGame.GoalieInput (goalieInputC) where
 
+import Brick.Types (Widget)
+import Brick.Widgets.Core (str, vBox)
 import Data.Maybe (fromMaybe)
 import Lens.Micro ((^.))
-import qualified UI.NCurses as C
 
 import Mtlstats.Format
 import Mtlstats.Menu
@@ -52,11 +53,11 @@ goalsAllowedC = promptControllerWith header goalsAllowedPrompt
 selectGameGoalieC :: Controller
 selectGameGoalieC = menuStateController gameGoalieMenu
 
-header :: ProgState -> C.Update ()
+header :: ProgState -> Widget () -> Widget ()
-header s = C.drawString $ unlines
+header s w = vBox $ map str
   [ "*** GAME " ++ padNum 2 (s^.database.dbGames) ++ " ***"
   , fromMaybe "" $ do
     n <- s^.progMode.gameStateL.gameSelectedGoalie
     g <- nth n $ s^.database.dbGoalies
     Just $ goalieSummary g
-  ]
+  ] ++ [w]

src/Mtlstats/Control/TitleScreen.hs

@@ -23,34 +23,32 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 module Mtlstats.Control.TitleScreen (titleScreenC) where
 
-import Control.Monad.Trans.State (modify)
+import Brick.Types (BrickEvent (VtyEvent))
+import Brick.Widgets.Center (hCenter)
+import Brick.Widgets.Core (str, vBox)
+import Control.Monad.State.Class (modify)
 import Data.Char (chr)
-import qualified UI.NCurses as C
+import Graphics.Vty.Input.Events (Event (EvKey))
 
 import Mtlstats.Actions
-import Mtlstats.Format
 import Mtlstats.Types
 
 titleScreenC :: Controller
 titleScreenC = Controller
-  { drawController = const $ do
+  { drawController = const $ vBox $ map (hCenter . str)
-    (_, cols) <- C.windowSize
+    $  [ ""
-    C.drawString $ unlines $ map (centre $ fromIntegral $ pred cols)
+       , "MONTREAL CANADIENS STATISTICS"
-      $  [ ""
+       ]
-         , "MONTREAL CANADIENS STATISTICS"
+    ++ titleText
-         ]
+    ++ [ ""
-      ++ titleText
+       , "Copyright (C) 1984, 1985, 2019-2021, 2023 Rhéal Lamothe"
-      ++ [ ""
+       , "<rheal.lamothe@gmail.com>"
-         , "Copyright (C) 1984, 1985, 2019-2021, 2023 Rhéal Lamothe"
+       , ""
-         , "<rheal.lamothe@gmail.com>"
+       , "Press any key to continue..."
-         , ""
+       ]
-         , "Press any key to continue..."
-         ]
-    return C.CursorInvisible
   , handleController = \case
-    C.EventCharacter _  -> modify backHome >> return True
+    VtyEvent (EvKey _ _) -> modify backHome
-    C.EventSpecialKey _ -> modify backHome >> return True
+    _                   -> return ()
-    _                   -> return True
   }
 
 titleText :: [String]
@@ -60,7 +58,7 @@ titleText = box $ map (map blockify) $ foldl joinBlocks (repeat "")
 box :: [String] -> [String]
 box strs
   =  [[tl] ++ replicate width horiz ++ [tr]]
-  ++ map (\str -> [vert] ++ str ++ [vert]) strs
+  ++ map (\s -> [vert] ++ s ++ [vert]) strs
   ++ [[bl] ++ replicate width horiz ++ [br]]
   where
     width = length $ head strs

src/Mtlstats/Handlers.hs

@@ -21,12 +21,13 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 module Mtlstats.Handlers (ynHandler) where
 
+import Brick.Types (BrickEvent (VtyEvent))
 import Data.Char (toUpper)
-import qualified UI.NCurses as C
+import Graphics.Vty.Input.Events (Event (EvKey), Key (KChar))
 
 -- | Handler for a yes/no prompt
-ynHandler :: C.Event -> Maybe Bool
+ynHandler :: BrickEvent () () -> Maybe Bool
-ynHandler (C.EventCharacter c) = case toUpper c of
+ynHandler (VtyEvent (EvKey (KChar c) _)) = case toUpper c of
   'Y' -> Just True
   'N' -> Just False
   _   -> Nothing

src/Mtlstats/Helpers/Position.hs

@@ -28,12 +28,12 @@ module Mtlstats.Helpers.Position
   , getPositions
   ) where
 
-import Control.Monad.Trans.State (gets)
 import Data.Char (toUpper)
 import Data.List (isInfixOf)
 import Data.Maybe (fromMaybe)
 import qualified Data.Set as S
 import Lens.Micro ((^.), to)
+import Lens.Micro.Mtl (use)
 
 import Mtlstats.Types
 import Mtlstats.Util
@@ -78,7 +78,7 @@ posCallback
 posCallback callback = \case
   Nothing -> callback ""
   Just n  -> do
-    ps <- gets (^.database.to getPositions)
+    ps <- use (database.to getPositions)
     let pos = fromMaybe "" $ nth n ps
     callback pos
 

src/Mtlstats/Menu.hs

@@ -34,40 +34,39 @@ module Mtlstats.Menu (
   editMenu
 ) where
 
-import Control.Monad.Trans.State (gets, modify)
+import Brick.Main (halt)
+import Brick.Types (BrickEvent (VtyEvent), Widget)
+import Brick.Widgets.Center (hCenter)
+import Brick.Widgets.Core (str, vBox)
+import Control.Monad.State.Class (gets, modify)
 import Data.Char (toUpper)
 import qualified Data.Map as M
 import Data.Maybe (mapMaybe)
+import Graphics.Vty.Input.Events (Event (EvKey), Key (KChar))
 import Lens.Micro ((^.), (?~))
-import qualified UI.NCurses as C
 
 import Mtlstats.Actions
 import qualified Mtlstats.Actions.NewGame.GoalieInput as GI
 import Mtlstats.Actions.EditStandings
-import Mtlstats.Format
 import Mtlstats.Types
 import Mtlstats.Types.Menu
 import Mtlstats.Util
 
 -- | Generates a simple 'Controller' for a Menu
 menuController :: Menu () -> Controller
-menuController = menuControllerWith $ const $ return ()
+menuController = menuControllerWith $ const id
 
 -- | Generate a simple 'Controller' for a 'Menu' with a header
 menuControllerWith
-  :: (ProgState -> C.Update ())
+  :: (ProgState -> Widget () -> Widget())
-  -- ^ Generates the header
+  -- ^ Function to attach the header
   -> Menu ()
   -- ^ The menu
   -> Controller
   -- ^ The resulting controller
 menuControllerWith header menu = Controller
-  { drawController = \s -> do
+  { drawController = \s -> header s $ drawMenu menu
-    header s
+  , handleController = menuHandler menu
-    drawMenu menu
-  , handleController = \e -> do
-    menuHandler menu e
-    return True
   }
 
 -- | Generate and create a controller for a menu based on the current
@@ -82,38 +81,33 @@ menuStateController menuFunc = Controller
   , handleController = \e -> do
     menu <- gets menuFunc
     menuHandler menu e
-    return True
   }
 
 -- | The draw function for a 'Menu'
-drawMenu :: Menu a -> C.Update C.CursorMode
+drawMenu :: Menu a -> Widget ()
-drawMenu m = do
+drawMenu m = let
-  (_, cols) <- C.windowSize
+  menuLines = lines $ show m
-  let
+  in hCenter $ vBox $ map str menuLines
-    width    = fromIntegral $ pred cols
-    menuText = map (centre width) $ lines $ show m
-  C.drawString $ unlines menuText
-  return C.CursorInvisible
 
 -- | The event handler for a 'Menu'
-menuHandler :: Menu a -> C.Event -> Action a
+menuHandler :: Menu a -> Handler a
-menuHandler m (C.EventCharacter c) =
+menuHandler m (VtyEvent (EvKey (KChar c) [])) =
   case filter (\i -> i^.miKey == toUpper c) $ m^.menuItems of
     i:_ -> i^.miAction
     []  -> return $ m^.menuDefault
 menuHandler m _ = return $ m^.menuDefault
 
 -- | The main menu
-mainMenu :: Menu Bool
+mainMenu :: Menu ()
-mainMenu = Menu "MASTER MENU" True
+mainMenu = Menu "MASTER MENU" ()
   [ MenuItem 'A' "NEW SEASON" $
-    modify startNewSeason >> return True
+    modify startNewSeason
   , MenuItem 'B' "NEW GAME" $
-    modify startNewGame >> return True
+    modify startNewGame
   , MenuItem 'C' "EDIT MENU" $
-    modify edit >> return True
+    modify edit
   , MenuItem 'E' "EXIT" $
-    saveDatabase >> return False
+    saveDatabase >> halt
   ]
 
 -- | The new season menu

src/Mtlstats/Menu/EditGoalie.hs

@@ -25,7 +25,7 @@ module Mtlstats.Menu.EditGoalie
   , editGoalieLtMenu
   ) where
 
-import Control.Monad.Trans.State (modify)
+import Control.Monad.State.Class (modify)
 import Lens.Micro ((.~), (%~))
 
 import Mtlstats.Actions

src/Mtlstats/Menu/EditPlayer.hs

@@ -25,7 +25,7 @@ module Mtlstats.Menu.EditPlayer
   , editPlayerLtMenu
   ) where
 
-import Control.Monad.Trans.State (modify)
+import Control.Monad.State.Class (modify)
 import Lens.Micro ((.~), (%~))
 
 import Mtlstats.Actions

src/Mtlstats/Menu/EditStandings.hs

@@ -25,7 +25,7 @@ module Mtlstats.Menu.EditStandings
   , editAwayStandingsMenu
   ) where
 
-import Control.Monad.Trans.State (modify)
+import Control.Monad.State.Class (modify)
 
 import Mtlstats.Actions
 import Mtlstats.Actions.EditStandings

src/Mtlstats/Prompt.hs

@@ -19,11 +19,8 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 -}
 
-{-# LANGUAGE LambdaCase #-}
-
 module Mtlstats.Prompt (
   -- * Prompt Functions
-  drawPrompt,
   promptHandler,
   promptControllerWith,
   promptController,
@@ -51,14 +48,20 @@ module Mtlstats.Prompt (
   playerToEditPrompt
 ) where
 
+import Brick.Types (BrickEvent (VtyEvent), Location (Location), Widget)
+import Brick.Widgets.Core (hBox, showCursor, str)
 import Control.Monad (when)
 import Control.Monad.Extra (whenJust)
-import Control.Monad.Trans.State (gets, modify)
+import Control.Monad.State.Class (gets, modify)
 import Data.Char (isAlphaNum, isDigit, toUpper)
+import Graphics.Text.Width (safeWcswidth)
+import Graphics.Vty.Input.Events
+  ( Event (EvKey)
+  , Key (KChar, KEnter, KEsc, KFun)
+  )
 import Lens.Micro ((^.), (&), (.~), (?~), (%~))
-import Lens.Micro.Extras (view)
+import Lens.Micro.Mtl ((.=), use)
 import Text.Read (readMaybe)
-import qualified UI.NCurses as C
 
 import Mtlstats.Actions
 import Mtlstats.Config
@@ -66,41 +69,31 @@ import Mtlstats.Helpers.Position
 import Mtlstats.Types
 import Mtlstats.Util
 
--- | Draws the prompt to the screen
-drawPrompt :: Prompt -> ProgState -> C.Update C.CursorMode
-drawPrompt p s = do
-  promptDrawer p s
-  return C.CursorVisible
-
 -- | Event handler for a prompt
-promptHandler :: Prompt -> C.Event -> Action ()
+promptHandler :: Prompt -> Handler ()
-promptHandler p (C.EventCharacter '\n') = do
+promptHandler p (VtyEvent (EvKey KEnter [])) = do
-  val <- gets $ view inputBuffer
+  val <- use inputBuffer
-  modify $ inputBuffer .~ ""
+  inputBuffer .= ""
   promptAction p val
-promptHandler p (C.EventCharacter c) =
+promptHandler p (VtyEvent (EvKey (KChar c) [])) =
   modify $ inputBuffer %~ promptProcessChar p c
-promptHandler _ (C.EventSpecialKey C.KeyBackspace) =
+promptHandler _ (VtyEvent (EvKey KEsc [])) =
   modify removeChar
-promptHandler p (C.EventSpecialKey k) =
+promptHandler p (VtyEvent (EvKey k m)) =
-  promptSpecialKey p k
+  promptSpecialKey p k m
 promptHandler _ _ = return ()
 
 -- | Builds a controller out of a prompt with a header
 promptControllerWith
-  :: (ProgState -> C.Update ())
+  :: (ProgState -> Widget () -> Widget ())
   -- ^ The header
   -> Prompt
   -- ^ The prompt to use
   -> Controller
   -- ^ The resulting controller
 promptControllerWith header prompt = Controller
-  { drawController = \s -> do
+  { drawController   = \s -> header s $ drawPrompt prompt s
-    header s
+  , handleController = promptHandler prompt
-    drawPrompt prompt s
-  , handleController = \e -> do
-    promptHandler prompt e
-    return True
   }
 
 -- | Builds a controller out of a prompt
@@ -109,7 +102,7 @@ promptController
   -- ^ The prompt to use
   -> Controller
   -- ^ The resulting controller
-promptController = promptControllerWith (const $ return ())
+promptController = promptControllerWith $ const id
 
 -- | Builds a string prompt
 strPrompt
@@ -119,10 +112,10 @@ strPrompt
   -- ^ The callback function for the result
   -> Prompt
 strPrompt pStr act = Prompt
-  { promptDrawer      = drawSimplePrompt pStr
+  { drawPrompt        = drawSimplePrompt pStr
   , promptProcessChar = \ch -> (++ [ch])
   , promptAction      = act
-  , promptSpecialKey  = const $ return ()
+  , promptSpecialKey  = \_ _ -> return ()
   }
 
 -- | Creates an upper case string prompt
@@ -179,12 +172,12 @@ numPromptWithFallback
   -- ^ The callback function for the result
   -> Prompt
 numPromptWithFallback pStr fallback act = Prompt
-  { promptDrawer      = drawSimplePrompt pStr
+  { drawPrompt        = drawSimplePrompt pStr
-  , promptProcessChar = \ch str -> if isDigit ch
+  , promptProcessChar = \ch existing -> if isDigit ch
-    then str ++ [ch]
+    then existing ++ [ch]
-    else str
+    else existing
   , promptAction      = maybe fallback act . readMaybe
-  , promptSpecialKey  = const $ return ()
+  , promptSpecialKey  = \_ _ -> return ()
   }
 
 -- | Prompts for a database name
@@ -215,18 +208,21 @@ newSeasonPrompt = dbNamePrompt "Filename for new season: " $ \fn ->
 -- | Builds a selection prompt
 selectPrompt :: SelectParams a -> Prompt
 selectPrompt params = Prompt
-  { promptDrawer = \s -> do
+  { drawPrompt = \s -> let
-    let sStr = s^.inputBuffer
+    sStr       = s^.inputBuffer
-    C.drawString $ spPrompt params ++ sStr
+    pStr       = spPrompt params ++ sStr
-    (row, col) <- C.cursorPosition
+    pWidth     = safeWcswidth pStr
-    C.drawString $ "\n\n" ++ spSearchHeader params ++ "\n"
+    results    = zip [1..maxFunKeys] $ spSearch params sStr (s^.database)
-    let results = zip [1..maxFunKeys] $ spSearch params sStr (s^.database)
+    fmtRes     = map
-    C.drawString $ unlines $ map
       (\(n, (_, x)) -> let
         desc = spElemDesc params x
-        in "F" ++ show n ++ ") " ++ desc)
+        in str $ "F" ++ show n ++ ") " ++ desc)
       results
-    C.moveCursor row col
+    in hBox $
+      [ showCursor () (Location (0, pWidth)) $ str pStr
+      , str ""
+      , str $ spSearchHeader params
+      ] ++ fmtRes
   , promptProcessChar = spProcessChar params
   , promptAction = \sStr -> if null sStr
     then spCallback params Nothing
@@ -235,12 +231,12 @@ selectPrompt params = Prompt
       case spSearchExact params sStr db of
         Nothing -> spNotFound params sStr
         Just n  -> spCallback params $ Just n
-  , promptSpecialKey = \case
+  , promptSpecialKey = \key _ -> case key of
-    C.KeyFunction rawK -> do
+    KFun rawK -> do
-      sStr <- gets (^.inputBuffer)
+      sStr <- use inputBuffer
-      db   <- gets (^.database)
+      db   <- use database
       let
-        n       = pred $ fromInteger rawK
+        n       = pred rawK
         results = spSearch params sStr db
       when (n < maxFunKeys) $
         whenJust (nth n results) $ \(sel, _) -> do
@@ -406,5 +402,8 @@ playerToEditPrompt :: Prompt
 playerToEditPrompt = selectPlayerPrompt "Player to edit: " $
   modify . (progMode.editPlayerStateL.epsSelectedPlayer .~)
 
-drawSimplePrompt :: String -> ProgState -> C.Update ()
+drawSimplePrompt :: String -> Renderer
-drawSimplePrompt pStr s = C.drawString $ pStr ++ s^.inputBuffer
+drawSimplePrompt pStr s = let
+  fullStr  = pStr ++ s^.inputBuffer
+  strWidth = safeWcswidth fullStr
+  in showCursor () (Location (0, strWidth)) $ str fullStr

src/Mtlstats/Prompt/EditGoalie.hs

@@ -39,7 +39,7 @@ module Mtlstats.Prompt.EditGoalie
   , editGoalieLtTiesPrompt
   ) where
 
-import Control.Monad.Trans.State (modify)
+import Control.Monad.State.Class (modify)
 import Lens.Micro ((.~))
 
 import Mtlstats.Actions

src/Mtlstats/Prompt/EditPlayer.hs

@@ -31,7 +31,7 @@ module Mtlstats.Prompt.EditPlayer
   , editPlayerLtPMinPrompt
   ) where
 
-import Control.Monad.Trans.State (modify)
+import Control.Monad.State.Class (modify)
 import Lens.Micro ((.~))
 
 import Mtlstats.Actions

src/Mtlstats/Prompt/EditStandings.hs

@@ -32,7 +32,7 @@ module Mtlstats.Prompt.EditStandings
   , editAwayGoalsAgainstPrompt
   ) where
 
-import Control.Monad.Trans.State (modify)
+import Control.Monad.State.Class (modify)
 import Lens.Micro ((.~), (%~))
 
 import Mtlstats.Prompt

src/Mtlstats/Prompt/NewGame.hs

@@ -35,7 +35,7 @@ module Mtlstats.Prompt.NewGame
   ) where
 
 import Control.Monad (when)
-import Control.Monad.Trans.State (gets, modify)
+import Control.Monad.State.Class (gets, modify)
 import Lens.Micro ((^.), (.~), (?~), (%~))
 
 import Mtlstats.Actions.NewGame

src/Mtlstats/Prompt/NewGame/GoalieInput.hs

@@ -27,7 +27,7 @@ module Mtlstats.Prompt.NewGame.GoalieInput
   , goalsAllowedPrompt
   ) where
 
-import Control.Monad.Trans.State (modify)
+import Control.Monad.State.Class (modify)
 import Lens.Micro ((?~))
 
 import Mtlstats.Actions.NewGame.GoalieInput

src/Mtlstats/Types.hs

@@ -24,7 +24,9 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 module Mtlstats.Types (
   -- * Types
   Controller (..),
+  Renderer,
   Action,
+  Handler,
   ProgState (..),
   ProgMode (..),
   GameState (..),
@@ -52,7 +54,7 @@ module Mtlstats.Types (
   progMode,
   dbName,
   inputBuffer,
-  scrollOffset,
+  scroller,
   -- ** ProgMode Lenses
   gameStateL,
   createPlayerStateL,
@@ -195,7 +197,8 @@ module Mtlstats.Types (
   gsAverage
 ) where
 
-import Control.Monad.Trans.State (StateT)
+import Brick.Main (ViewportScroll, viewportScroll)
+import Brick.Types (BrickEvent, EventM, Widget)
 import Data.Aeson
   ( FromJSON
   , ToJSON
@@ -213,22 +216,28 @@ import Data.Aeson
 import Data.Char (toUpper)
 import Data.List (find, isInfixOf)
 import qualified Data.Map as M
+import Graphics.Vty.Input.Events (Key, Modifier)
 import Lens.Micro (Lens', lens, (&), (^.), (.~))
 import Lens.Micro.TH (makeLenses)
-import qualified UI.NCurses as C
 
 import Mtlstats.Config
 
 -- | Controls the program flow
 data Controller = Controller
-  { drawController   :: ProgState -> C.Update C.CursorMode
+  { drawController :: Renderer
-  -- ^ The drawing phase
+  -- ^ The drawing routine
-  , handleController :: C.Event -> Action Bool
+  , handleController :: Handler ()
   -- ^ The event handler
   }
 
+-- | Renders a view based on a "ProgState"
+type Renderer = ProgState -> Widget ()
+
 -- | Action which maintains program state
-type Action a = StateT ProgState C.Curses a
+type Action a = EventM () ProgState a
+
+-- | Handles an event
+type Handler a = BrickEvent () () -> Action a
 
 -- | Represents the program state
 data ProgState = ProgState
@@ -240,8 +249,8 @@ data ProgState = ProgState
   -- ^ The name of the database file
   , _inputBuffer  :: String
   -- ^ Buffer for user input
-  , _scrollOffset :: Int
+  , _scroller     :: ViewportScroll ()
-  -- ^ The scrolling offset for the display
+  -- ^ Scroller for the reports
   }
 
 -- | The program mode
@@ -532,13 +541,13 @@ data GameStats = GameStats
 
 -- | Defines a user prompt
 data Prompt = Prompt
-  { promptDrawer      :: ProgState -> C.Update ()
+  { drawPrompt        :: ProgState -> Widget ()
   -- ^ Draws the prompt to the screen
   , promptProcessChar :: Char -> String -> String
   -- ^ Modifies the string based on the character entered
   , promptAction      :: String -> Action ()
   -- ^ Action to perform when the value is entered
-  , promptSpecialKey  :: C.Key -> Action ()
+  , promptSpecialKey  :: Key -> [Modifier] -> Action ()
   -- ^ Action to perform when a special key is pressed
   }
 
@@ -786,11 +795,11 @@ esmSubModeL = lens
 -- | Constructor for a 'ProgState'
 newProgState :: ProgState
 newProgState = ProgState
-  { _database     = newDatabase
+  { _database    = newDatabase
-  , _progMode     = TitleScreen
+  , _progMode    = TitleScreen
-  , _dbName       = ""
+  , _dbName      = ""
-  , _inputBuffer  = ""
+  , _inputBuffer = ""
-  , _scrollOffset = 0
+  , _scroller    = viewportScroll ()
   }
 
 -- | Constructor for a 'GameState'

src/Mtlstats/Util.hs

@@ -26,8 +26,11 @@ module Mtlstats.Util
   , updateMap
   , slice
   , capitalizeName
+  , linesToWidget
   ) where
 
+import Brick.Types (Widget)
+import Brick.Widgets.Core (str, vBox)
 import Data.Char (isSpace, toUpper)
 import qualified Data.Map as M
 
@@ -105,9 +108,9 @@ capitalizeName
   -- ^ The current string
   -> String
   -- ^ The resulting string
-capitalizeName ch str = str ++ [ch']
+capitalizeName ch s = s ++ [ch']
   where
-    ch' = if lockFlag str
+    ch' = if lockFlag s
       then toUpper ch
       else ch
     lockFlag "" = True
@@ -118,3 +121,6 @@ capitalizeName ch str = str ++ [ch']
     lockFlag' (c:cs)
       | isSpace c = lockFlag' cs
       | otherwise = False
+
+linesToWidget :: [String] -> Widget ()
+linesToWidget = vBox . map str

stack.yaml

@@ -17,7 +17,7 @@
 #
 # resolver: ./custom-snapshot.yaml
 # resolver: https://example.com/snapshots/2018-01-01.yaml
-resolver: lts-14.0
+resolver: lts-20.22
 
 # User packages to be built.
 # Various formats can be used as shown in the example below.

stack.yaml.lock

@@ -0,0 +1,19 @@
+# This file was autogenerated by Stack.
+# You should not edit this file by hand.
+# For more information, please see the documentation at:
+#   https://docs.haskellstack.org/en/stable/lock_files
+
+packages:
+- completed:
+    hackage: ncurses-0.2.16@sha256:8ad9fe6562a80d28166d76adbac1eb4d40c6511fe4e9272ed6e1166dc2f1cdf1,3575
+    pantry-tree:
+      sha256: 093bdc85ed518c81724f5b6b81c24ab4ebdd231551861f4feaa43361136f70b7
+      size: 674
+  original:
+    hackage: ncurses-0.2.16@sha256:8ad9fe6562a80d28166d76adbac1eb4d40c6511fe4e9272ed6e1166dc2f1cdf1,3575
+snapshots:
+- completed:
+    sha256: dcf4fc28f12d805480ddbe8eb8c370e11db12f0461d0110a4240af27ac88d725
+    size: 650255
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/20/22.yaml
+  original: lts-20.22

test/Actions/NewGame/GoalieInputSpec.hs

@@ -215,7 +215,7 @@ setGameGoalieSpec = describe "setGameGoalie" $ mapM_
 
       let
         ps'          = setGameGoalie goalieId ps
-        [joe', bob'] = ps'^.database.dbGoalies
+        (joe', bob') = getFirstTwo $ ps'^.database.dbGoalies
         gStats'      = ps'^.progMode.gameStateL.gameGoalieStats
 
       context "Joe" $ joe' `TS.compareTest` expectedJoe
@@ -380,3 +380,7 @@ setGameGoalieSpec = describe "setGameGoalie" $ mapM_
     incSO   = gsShutouts %~ succ
     incLoss = gsLosses   %~ succ
     incOT   = gsTies     %~ succ
+
+getFirstTwo :: [a] -> (a, a)
+getFirstTwo (x:y:_) = (x, y)
+getFirstTwo _       = error "insufficient members of list"

test/ActionsSpec.hs

@@ -63,8 +63,6 @@ spec = describe "Mtlstats.Actions" $ do
   resetCreatePlayerStateSpec
   resetCreateGoalieStateSpec
   backHomeSpec
-  scrollUpSpec
-  scrollDownSpec
   NewGame.spec
   EditStandings.spec
 
@@ -425,7 +423,6 @@ backHomeSpec = describe "backHome" $ do
     input = newProgState
       & progMode.gameStateL .~ newGameState
       & inputBuffer         .~ "foo"
-      & scrollOffset        .~ 123
     result = backHome input
 
   it "should set the program mode back to MainMenu" $
@@ -435,33 +432,3 @@ backHomeSpec = describe "backHome" $ do
 
   it "should clear the input buffer" $
     result^.inputBuffer `shouldBe` ""
-
-  it "should reset the scroll offset" $
-    result^.scrollOffset `shouldBe` 0
-
-scrollUpSpec :: Spec
-scrollUpSpec = describe "scrollUp" $ do
-
-  context "scrolled down" $
-    it "should decrease the scroll offset by one" $ let
-      ps  = newProgState & scrollOffset .~ 10
-      ps' = scrollUp ps
-      in ps'^.scrollOffset `shouldBe` 9
-
-  context "at top" $
-    it "should keep the scroll offset at zero" $ let
-      ps = scrollUp newProgState
-      in ps^.scrollOffset `shouldBe` 0
-
-  context "above top" $
-    it "should return the scroll offset to zero" $ let
-      ps  = newProgState & scrollOffset .~ (-10)
-      ps' = scrollUp ps
-      in ps'^.scrollOffset `shouldBe` 0
-
-scrollDownSpec :: Spec
-scrollDownSpec = describe "scrollDown" $
-  it "should increase the scroll offset" $ let
-    ps  = newProgState & scrollOffset .~ 10
-    ps' = scrollDown ps
-    in ps'^.scrollOffset `shouldBe` 11

test/HandlersSpec.hs

@@ -22,7 +22,9 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 module HandlersSpec (spec) where
 
 import Test.Hspec (Spec, context, describe, it, shouldBe)
-import qualified UI.NCurses as C
+
+import Brick.Types (BrickEvent (VtyEvent))
+import Graphics.Vty.Input.Events (Event (EvKey, EvResize), Key (KChar))
 
 import Mtlstats.Handlers
 
@@ -37,10 +39,18 @@ ynHandlerSpec = describe "ynHandler" $ mapM_
       it ("should be " ++ show expected) $
         ynHandler event `shouldBe` expected)
   --  description,   event,                expected
-  [ ( "Y pressed",   C.EventCharacter 'Y', Just True  )
+  [ ( "Y pressed",   capitalY,   Just True  )
-  , ( "y pressed",   C.EventCharacter 'y', Just True  )
+  , ( "y pressed",   lowerY,     Just True  )
-  , ( "N pressed",   C.EventCharacter 'N', Just False )
+  , ( "N pressed",   capitalN,   Just False )
-  , ( "n pressed",   C.EventCharacter 'n', Just False )
+  , ( "n pressed",   lowerN,     Just False )
-  , ( "x pressed",   C.EventCharacter 'x', Nothing    )
+  , ( "x pressed",   lowerX,     Nothing    )
-  , ( "other event", C.EventResized,       Nothing    )
+  , ( "other event", otherEvent, Nothing    )
   ]
+  where
+    capitalY   = chE 'Y'
+    lowerY     = chE 'y'
+    capitalN   = chE 'N'
+    lowerN     = chE 'n'
+    lowerX     = chE 'x'
+    otherEvent = VtyEvent $ EvResize 0 0
+    chE c      = VtyEvent $ EvKey (KChar c) []

test/TypesSpec.hs

@@ -34,8 +34,8 @@ import Control.Monad (replicateM)
 import Data.Aeson (FromJSON, ToJSON, decode, encode, toJSON)
 import Data.Aeson.Types (Value (Object))
 import qualified Data.Map.Lazy as M
-import qualified Data.HashMap.Strict as HM
 import Data.Ratio ((%))
+import qualified GHC.Exts as HM
 import Lens.Micro (Lens', (&), (^.), (.~), (?~))
 import System.Random (randomIO, randomRIO)
 import Test.Hspec (Spec, context, describe, it, shouldBe)