{- |
Module      :  Neovim.Util
Description :  Utility functions
Copyright   :  (c) Sebastian Witte
License     :  Apache-2.0

Maintainer  :  woozletoff@gmail.com
Stability   :  experimental
Portability :  GHC
-}
module Neovim.Util (
    whenM,
    unlessM,
    oneLineErrorMessage,
) where

import Control.Monad (unless, when)
import qualified Data.Text as T
import Neovim.Context

-- | 'when' with a monadic predicate.
whenM :: (Monad m) => m Bool -> m () -> m ()
whenM :: forall (m :: * -> *). Monad m => m Bool -> m () -> m ()
whenM m Bool
mp m ()
a = m Bool
mp forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= \Bool
p -> forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
when Bool
p m ()
a

-- | 'unless' with a monadic predicate.
unlessM :: (Monad m) => m Bool -> m () -> m ()
unlessM :: forall (m :: * -> *). Monad m => m Bool -> m () -> m ()
unlessM m Bool
mp m ()
a = m Bool
mp forall (m :: * -> *) a b. Monad m => m a -> (a -> m b) -> m b
>>= \Bool
p -> forall (f :: * -> *). Applicative f => Bool -> f () -> f ()
unless Bool
p m ()
a

oneLineErrorMessage :: Doc AnsiStyle -> T.Text
oneLineErrorMessage :: Doc AnsiStyle -> Text
oneLineErrorMessage Doc AnsiStyle
d = case Text -> [Text]
T.lines forall a b. (a -> b) -> a -> b
$ Doc AnsiStyle -> Text
docToText Doc AnsiStyle
d of
    (Text
x : [Text]
_) -> Text
x
    [] -> forall a. Monoid a => a
mempty