Eval.hs

{-# LANGUAGE NoImplicitPrelude     #-}
{-# LANGUAGE DuplicateRecordFields #-}
{-# LANGUAGE NoFieldSelectors      #-}
{-# LANGUAGE OverloadedRecordDot   #-}

{-|
Module      : Stack.Eval
Description : Types and functions related to Stack's @eval@ command.
License     : BSD-3-Clause

Types and functions related to Stack's @eval@ command.
-}

module Stack.Eval
  ( EvalOpts (..)
  , evalCmd
  ) where

import           Stack.Exec
                   ( ExecOpts (..), ExecOptsExtra, SpecialExecCmd (..)
                   , execCmd
                   )
import           Stack.Prelude
import           Stack.Types.Runner ( Runner )

-- | Type representing command line options for the @stack eval@ command.
data EvalOpts = EvalOpts
  { arg :: !String
  , extra :: !ExecOptsExtra
  }
  deriving Show

-- | Function underlying the @stack eval@ command. Evaluate some Haskell code
-- inline.
evalCmd :: EvalOpts -> RIO Runner ()
evalCmd eval = execCmd execOpts
 where
  execOpts = ExecOpts
    { cmd = ExecGhc
    , args = ["-e", eval.arg]
    , extra = eval.extra
    }