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|
{-# LANGUAGE ImportQualifiedPost #-}
{-# LANGUAGE TypeFamilies #-}
module Hsm.Command.Readline
( Readline
, readline
, runReadline
)
where
import Data.Function ((&))
import Effectful (Dispatch (Static), DispatchOf, Eff, Effect, 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
import Prelude hiding (takeWhile)
data Readline :: Effect
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 handle <- S.getStaticRep
H.getInputLine "% "
& H.withInterrupt
& H.handleInterrupt (return Nothing)
& H.queryInput handle
& S.unsafeEff_
where
flushLogger :: Eff es ()
flushLogger = getLoggerEnv >>= S.unsafeEff_ . waitForLogger . leLogger
runReadline
:: ( IOE :> es
, Resource :> es
)
=> Eff (Readline : es) a
-> Eff es a
runReadline action = do
handle <- snd <$> allocate state H.cancelInput
S.evalStaticRep (Readline handle) action
where
settings :: H.Settings IO
settings = H.defaultSettings {H.historyFile = Just "/tmp/hsm_command_history"}
state :: IO H.InputState
state = H.initializeInput settings
|
