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|
{-# LANGUAGE DataKinds #-}
{-# LANGUAGE TypeFamilies #-}
module Hsm.Command.Readline
( Readline
, readline
, runReadline
) where
import Effectful (Dispatch(Static), DispatchOf, Eff, IOE, (:>))
import Effectful.Dispatch.Static qualified as S
import Effectful.Log (Log, getLoggerEnv, leLogger, waitForLogger)
import Effectful.Resource (Resource, allocate)
import System.Console.Haskeline qualified as H
import System.Console.Haskeline.IO qualified as H
data Readline a b
type instance DispatchOf Readline = Static S.WithSideEffects
newtype instance S.StaticRep Readline =
Readline H.InputState
readline ::
forall es. (Log :> es, Readline :> es)
=> Eff es (Maybe String)
readline = do
flushLogger
Readline hdl <- S.getStaticRep
S.unsafeEff_ $ nextLine hdl
where
flushLogger :: Eff es ()
flushLogger = getLoggerEnv >>= S.unsafeEff_ . waitForLogger . leLogger
--
nextLine :: H.InputState -> IO (Maybe String)
nextLine hdl =
H.queryInput hdl
$ H.handleInterrupt (return Nothing)
$ H.withInterrupt
$ H.getInputLine "% "
runReadline :: (IOE :> es, Resource :> es) => Eff (Readline : es) a -> Eff es a
runReadline action = do
handle <- snd <$> allocate istate H.cancelInput
S.evalStaticRep (Readline handle) action
where
settings :: H.Settings IO
settings = H.defaultSettings {H.historyFile = Just ".hsm_command_history"}
--
istate :: IO H.InputState
istate = H.initializeInput settings
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