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

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module Language.Haskell.GhcMod.Target (
setTargetFiles
) where
import Control.Applicative ((<$>))
import Control.Monad (forM, void, (>=>))
import DynFlags (ExtensionFlag(..), xopt)
import GHC (DynFlags(..), LoadHowMuch(..))
import qualified GHC as G
import Language.Haskell.GhcMod.DynFlags
import Language.Haskell.GhcMod.Monad
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-- | Set the files as targets and load them.
setTargetFiles :: IOish m => [FilePath] -> GhcModT m ()
setTargetFiles files = do
targets <- forM files $ \file -> G.guessTarget file Nothing
G.setTargets targets
mode <- getMode
if mode == Intelligent then
loadTargets Intelligent
else do
mdls <- G.depanal [] False
let fallback = needsFallback mdls
if fallback then do
resetTargets targets
setIntelligent
loadTargets Intelligent
else
loadTargets Simple
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where
loadTargets Simple = do
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-- Reporting error A and error B
void $ G.load LoadAllTargets
mss <- filter (\x -> G.ms_hspp_file x `elem` files) <$> G.getModuleGraph
-- Reporting error B and error C
mapM_ (G.parseModule >=> G.typecheckModule >=> G.desugarModule) mss
-- Error B duplicates. But we cannot ignore both error reportings,
-- sigh. So, the logger makes log messages unique by itself.
loadTargets Intelligent = do
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df <- G.getSessionDynFlags
void $ G.setSessionDynFlags (setModeIntelligent df)
void $ G.load LoadAllTargets
resetTargets targets = do
G.setTargets []
void $ G.load LoadAllTargets
G.setTargets targets
setIntelligent = do
newdf <- setModeIntelligent <$> G.getSessionDynFlags
void $ G.setSessionDynFlags newdf
setMode Intelligent
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needsFallback :: G.ModuleGraph -> Bool
needsFallback = any (hasTHorQQ . G.ms_hspp_opts)
where
hasTHorQQ :: DynFlags -> Bool
hasTHorQQ dflags = any (`xopt` dflags) [Opt_TemplateHaskell, Opt_QuasiQuotes]