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67 lines
1.5 KiB
Haskell
67 lines
1.5 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE TemplateHaskell #-}
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module Main where
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import Lens.Micro ((.~), (^.), (&))
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import Lens.Micro.TH (makeLenses)
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import Control.Monad (void)
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import Data.Monoid
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import Data.Default
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import qualified Graphics.Vty as V
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import Brick.Main
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( App(..), neverShowCursor, defaultMain
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, suspendAndResume, halt, continue
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)
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import Brick.Types
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( Widget
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, EventM
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, Next
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)
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import Brick.Widgets.Core
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( vBox
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, str
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)
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data St =
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St { _stExternalInput :: String
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}
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makeLenses ''St
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drawUI :: St -> [Widget ()]
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drawUI st = [ui]
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where
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ui = vBox [ str $ "External input: \"" <> st^.stExternalInput <> "\""
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, str "(Press Esc to quit or Space to ask for input)"
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]
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appEvent :: St -> V.Event -> EventM () (Next St)
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appEvent st e =
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case e of
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V.EvKey V.KEsc [] -> halt st
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V.EvKey (V.KChar ' ') [] -> suspendAndResume $ do
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putStrLn "Suspended. Please enter something and press enter to resume:"
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s <- getLine
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return $ st & stExternalInput .~ s
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_ -> continue st
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initialState :: St
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initialState =
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St { _stExternalInput = ""
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}
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theApp :: App St V.Event ()
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theApp =
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App { appDraw = drawUI
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, appChooseCursor = neverShowCursor
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, appHandleEvent = appEvent
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, appStartEvent = return
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, appAttrMap = const def
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, appLiftVtyEvent = id
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}
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main :: IO ()
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main =
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void $ defaultMain theApp initialState
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