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Add :quit repl command #719

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merged 4 commits into from
Nov 29, 2018
Merged

Add :quit repl command #719

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59e6fcc
Add :quit repl command
kedashoe Nov 28, 2018
4a252f0
Merge branch 'master' into repl-quit
Gabriella439 Nov 29, 2018
7b6282a
Prefer `throwIO` to `throw`
kedashoe Nov 29, 2018
81eaaa2
Merge branch 'master' into repl-quit
Gabriella439 Nov 29, 2018
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6 changes: 6 additions & 0 deletions dhall/src/Dhall/Repl.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@ import Dhall.Binary (StandardVersion(..))
import Dhall.Import (standardVersion)
import Dhall.Pretty (CharacterSet(..))
import Lens.Family (set)
import System.Console.Haskeline (Interrupt(..))

import qualified Control.Monad.Trans.State.Strict as State
import qualified Data.Text as Text
Expand Down Expand Up @@ -234,6 +235,10 @@ saveBinding (file : "=" : tokens) = do
liftIO (System.IO.withFile file System.IO.WriteMode handler)
saveBinding _ = fail ":save should be of the form `:save x = y`"

cmdQuit :: ( MonadIO m, MonadState Env m ) => [String] -> m ()
cmdQuit _ = do
liftIO (putStrLn "Goodbye.")
liftIO (throwIO Interrupt)

options
:: ( Haskeline.MonadException m, MonadIO m, MonadState Env m )
Expand All @@ -242,6 +247,7 @@ options =
[ ( "type", dontCrash . typeOf )
, ( "let", dontCrash . addBinding )
, ( "save", dontCrash . saveBinding )
, ( "quit", cmdQuit )
]


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