68 lines
1.7 KiB
Haskell
68 lines
1.7 KiB
Haskell
{-
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passman
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Copyright (C) 2018 Jonathan Lamothe
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<jlamothe1980@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this program. If not, see
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<https://www.gnu.org/licenses/>.
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-}
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module Util (menu, run, req, tryReq, confirm) where
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import Control.Monad (join)
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import Control.Monad.Trans.Class (lift)
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import qualified Control.Monad.Trans.State as S
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import Data.Maybe (fromJust)
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import System.Console.HCL
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( Request
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, prompt
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, reqAgree
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, reqIf
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, reqMenu
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, reqResp
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, required
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, runRequest
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)
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import Types
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menu
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:: String
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-> [(String, S.StateT Status IO a)]
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-> S.StateT Status IO a
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menu title = reqState . prompt ("\n*** " ++ title ++ " ***") .
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reqMenu . map menuItem
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menuItem :: (String, a) -> (String, Request a)
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menuItem (str, x) = (str, return x)
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reqState :: Request (S.StateT s IO a) -> S.StateT s IO a
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reqState = join . req
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run :: Monad m => (s -> (a, s)) -> S.StateT s m a
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run f = S.StateT $ return . f
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req :: Request a -> S.StateT s IO a
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req = lift . fmap fromJust . runRequest . required
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tryReq :: Request a -> S.StateT s IO (Maybe a)
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tryReq = lift . runRequest
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confirm :: String -> Request Bool
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confirm x = required $ prompt (x ++ " (y/n): ") $ reqAgree Nothing reqResp
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--jl
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