menu functions

src/Mtlstats/Menu.hs

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+{- |
+
+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.Menu (
+  drawMenu,
+  menuHandler,
+) where
+
+import Control.Monad.Trans.State (StateT)
+import Lens.Micro ((^.))
+import qualified UI.NCurses as C
+
+import Mtlstats.Types
+import Mtlstats.Types.Menu
+
+-- | The draw function for a 'Menu'
+drawMenu :: Menu a -> C.Update ()
+drawMenu = C.drawString . show
+
+-- | The event handler for a 'Menu'
+menuHandler :: Menu a -> C.Event -> StateT ProgState C.Curses a
+menuHandler m (C.EventCharacter c) =
+  case filter (\i -> i ^. miKey == c) $ m ^. menuItems of
+    i:_ -> i ^. miAction
+    []  -> return $ m ^. menuDefault
+menuHandler m _ = return $ m ^. menuDefault