define menu types

src/Mtlstats/Types/Menu.hs

@@ -0,0 +1,66 @@
+{- |
+
+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/>.
+
+-}
+
+{-# LANGUAGE TemplateHaskell #-}
+
+module Mtlstats.Types.Menu (
+  -- * Types
+  Menu (..),
+  MenuItem (..),
+  -- * Lenses
+  -- ** Menu Lenses
+  menuTitle,
+  menuItems,
+  -- ** MenuItem Lenses
+  miKey,
+  miDescription,
+  miAction,
+) where
+
+import Control.Monad.Trans.State (StateT)
+import Lens.Micro ((^.))
+import Lens.Micro.TH (makeLenses)
+import qualified UI.NCurses as C
+
+import Mtlstats.Types
+
+-- | Defines a menu
+data Menu a = Menu
+  { _menuTitle :: String
+  , _menuItems :: [MenuItem a]
+  }
+
+-- | Defines a menu item
+data MenuItem a = MenuItem
+  { _miKey         :: Char
+  , _miDescription :: String
+  , _miAction      :: StateT ProgState C.Curses a
+  }
+
+makeLenses ''Menu
+makeLenses ''MenuItem
+
+instance Show (Menu a) where
+  show m = m ^. menuTitle ++ "\n" ++ items
+    where items = unlines $ map show $ m ^. menuItems
+
+instance Show (MenuItem a) where
+  show i = [i ^. miKey] ++ ") " ++ i ^. miDescription