ghc-mod/Language/Haskell/GhcMod/List.hs

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module Language.Haskell.GhcMod.List (modules) where
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import Control.Applicative ((<$>))
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import Control.Exception (SomeException(..))
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import Data.List (nub, sort)
import qualified GHC as G
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import Language.Haskell.GhcMod.Monad
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import Language.Haskell.GhcMod.Convert
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import Packages (pkgIdMap, exposedModules, sourcePackageId, display)
import UniqFM (eltsUFM)
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----------------------------------------------------------------
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-- | Listing installed modules.
modules :: IOish m => GhcModT m String
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modules = do
opt <- options
convert opt . (arrange opt) <$> (getModules `G.gcatch` handler)
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where
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getModules = getExposedModules <$> G.getSessionDynFlags
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getExposedModules = concatMap exposedModules'
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. eltsUFM . pkgIdMap . G.pkgState
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exposedModules' p =
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map G.moduleNameString (exposedModules p)
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`zip`
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repeat (display $ sourcePackageId p)
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arrange opt = nub . sort . map (dropPkgs opt)
dropPkgs opt (name, pkg)
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| detailed opt = name ++ " " ++ pkg
| otherwise = name
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handler (SomeException _) = return []