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

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module Language.Haskell.GhcMod.Info (
info
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, types
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) where
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import Data.Function (on)
import Data.List (sortBy)
import System.FilePath
import Exception (ghandle, SomeException(..))
import GHC (GhcMonad, SrcSpan)
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import Prelude
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import qualified GHC as G
import qualified Language.Haskell.GhcMod.Gap as Gap
import Language.Haskell.GhcMod.Convert
import Language.Haskell.GhcMod.Doc
import Language.Haskell.GhcMod.DynFlags
import Language.Haskell.GhcMod.Gap
import Language.Haskell.GhcMod.Logging
import Language.Haskell.GhcMod.Monad
import Language.Haskell.GhcMod.SrcUtils
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import Language.Haskell.GhcMod.Types
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import Language.Haskell.GhcMod.Utils (mkRevRedirMapFunc)
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import Language.Haskell.GhcMod.FileMapping (fileModSummaryWithMapping)
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----------------------------------------------------------------
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-- | Obtaining information of a target expression. (GHCi's info:)
info :: IOish m
=> FilePath -- ^ A target file.
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-> Expression -- ^ A Haskell expression.
-> GhcModT m String
info file expr =
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ghandle handler $
runGmlT' [Left file] deferErrors $
withInteractiveContext $ do
convert' =<< body
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where
handler (SomeException ex) = do
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gmLog GmException "info" $ text "" $$ nest 4 (showToDoc ex)
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convert' "Cannot show info"
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body :: (GhcMonad m, GmState m, GmEnv m) => m String
body = do
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m <- mkRevRedirMapFunc
sdoc <- Gap.infoThing m expr
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st <- getStyle
dflag <- G.getSessionDynFlags
return $ showPage dflag st sdoc
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----------------------------------------------------------------
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-- | Obtaining type of a target expression. (GHCi's type:)
types :: IOish m
=> Bool -- ^ Include constraints into type signature
-> FilePath -- ^ A target file.
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-> Int -- ^ Line number.
-> Int -- ^ Column number.
-> GhcModT m String
types withConstraints file lineNo colNo =
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ghandle handler $
runGmlT' [Left file] deferErrors $
withInteractiveContext $ do
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crdl <- cradle
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modSum <- fileModSummaryWithMapping (cradleCurrentDir crdl </> file)
srcSpanTypes <- getSrcSpanType withConstraints modSum lineNo colNo
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dflag <- G.getSessionDynFlags
st <- getStyle
convert' $ map (toTup dflag st) $ sortBy (cmp `on` fst) srcSpanTypes
where
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handler (SomeException ex) = do
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gmLog GmException "types" $ showToDoc ex
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return []
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getSrcSpanType :: (GhcMonad m) => Bool -> G.ModSummary -> Int -> Int -> m [(SrcSpan, G.Type)]
getSrcSpanType withConstraints modSum lineNo colNo =
G.parseModule modSum
>>= G.typecheckModule
>>= flip (collectSpansTypes withConstraints) (lineNo, colNo)