split mainLoop up into eventHandler and draw functions

package.yaml

@@ -22,6 +22,7 @@ description:         Please see the README on GitHub at <https://github.com/jlam
 dependencies:
 - base >= 4.7 && < 5
 - aeson >= 1.4.4.0 && < 1.5
+- extra >= 1.6.17 && < 1.7
 - microlens-th >= 0.4.2.3 && < 0.5
 - ncurses >= 0.2.16 && < 0.3
 - raw-strings-qq >= 1.1 && < 1.2

src/Mtlstats.hs

@@ -21,10 +21,15 @@ along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 module Mtlstats (initState, mainLoop) where
 
-import Control.Monad.Trans.State (StateT)
+import Control.Monad.Extra (whenM)
+import Control.Monad.Trans.Class (lift)
+import Control.Monad.Trans.State (StateT, get)
+import Data.Maybe (fromJust)
 import qualified UI.NCurses as C
 
+import Mtlstats.Events
 import Mtlstats.Types
+import Mtlstats.UI
 
 -- | Initializes the progran
 initState :: C.Curses ProgState
@@ -32,4 +37,8 @@ initState = return newProgState
 
 -- | Main program loop
 mainLoop :: StateT ProgState C.Curses ()
-mainLoop = return ()
+mainLoop = do
+  get >>= lift . draw
+  w <- lift C.defaultWindow
+  whenM (lift (fromJust <$> C.getEvent w Nothing) >>= handleEvent)
+    mainLoop

src/Mtlstats/Events.hs

@@ -0,0 +1,34 @@
+{- |
+
+mtlstats
+Copyright (C) 2019 Rhéal Lamothe
+<rheal.lamothe@gmail.com>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or (at
+your option) any later version.
+
+This program is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+-}
+
+module Mtlstats.Events (handleEvent) where
+
+import Control.Monad.Trans.State (StateT)
+import qualified UI.NCurses as C
+
+import Mtlstats.Types
+
+-- | Event handler
+handleEvent
+  :: C.Event
+  -- ^ The even being handled
+  -> StateT ProgState C.Curses Bool
+handleEvent _ = return False

src/Mtlstats/UI.hs

@@ -0,0 +1,30 @@
+{- |
+
+mtlstats
+Copyright (C) 2019 Rhéal Lamothe
+<rheal.lamothe@gmail.com>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or (at
+your option) any later version.
+
+This program is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+-}
+
+module Mtlstats.UI (draw) where
+
+import qualified UI.NCurses as C
+
+import Mtlstats.Types
+
+-- | Drawing function
+draw :: ProgState -> C.Curses ()
+draw _ = return ()