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CodeAction.hs
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CodeAction.hs
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-- Copyright (c) 2019 The DAML Authors. All rights reserved.
-- SPDX-License-Identifier: Apache-2.0
{-# LANGUAGE CPP #-}
{-# LANGUAGE GADTs #-}
module Development.IDE.Plugin.CodeAction
(
mkExactprintPluginDescriptor,
iePluginDescriptor,
typeSigsPluginDescriptor,
bindingsPluginDescriptor,
fillHolePluginDescriptor,
extendImportPluginDescriptor,
-- * For testing
matchRegExMultipleImports
) where
import Control.Applicative ((<|>))
import Control.Applicative.Combinators.NonEmpty (sepBy1)
import Control.Arrow (second,
(&&&),
(>>>))
import Control.Concurrent.STM.Stats (atomically)
import Control.Monad.Extra
import Control.Monad.IO.Class
import Control.Monad.Trans
import Control.Monad.Trans.Except (ExceptT (ExceptT))
import Control.Monad.Trans.Maybe
import Data.Char
import qualified Data.DList as DL
import Data.Function
import Data.Functor
import qualified Data.HashMap.Strict as Map
import qualified Data.HashSet as Set
import Data.List.Extra
import Data.List.NonEmpty (NonEmpty ((:|)))
import qualified Data.List.NonEmpty as NE
import qualified Data.Map.Strict as M
import Data.Maybe
import Data.Ord (comparing)
import qualified Data.Set as S
import qualified Data.Text as T
import qualified Data.Text.Encoding as T
import Development.IDE.Core.Rules
import Development.IDE.Core.RuleTypes
import Development.IDE.Core.Service
import Development.IDE.Core.Shake hiding (Log)
import Development.IDE.GHC.Compat hiding
(ImplicitPrelude)
import Development.IDE.GHC.Compat.Util
import Development.IDE.GHC.Error
import Development.IDE.GHC.ExactPrint
import qualified Development.IDE.GHC.ExactPrint as E
import Development.IDE.GHC.Util (printOutputable,
printRdrName)
import Development.IDE.Plugin.CodeAction.Args
import Development.IDE.Plugin.CodeAction.ExactPrint
import Development.IDE.Plugin.CodeAction.PositionIndexed
import Development.IDE.Plugin.CodeAction.Util
import Development.IDE.Plugin.Completions.Types
import qualified Development.IDE.Plugin.Plugins.AddArgument
import Development.IDE.Plugin.Plugins.Diagnostic
import Development.IDE.Plugin.Plugins.FillHole (suggestFillHole)
import Development.IDE.Plugin.Plugins.FillTypeWildcard (suggestFillTypeWildcard)
import Development.IDE.Plugin.Plugins.ImportUtils
import Development.IDE.Plugin.TypeLenses (suggestSignature)
import Development.IDE.Types.Exports
import Development.IDE.Types.Location
import Development.IDE.Types.Options
import GHC (AddEpAnn (AddEpAnn),
AnnsModule (am_main),
DeltaPos (..),
EpAnn (..),
LEpaComment)
import qualified GHC.LanguageExtensions as Lang
import Ide.Logger hiding
(group)
import Ide.PluginUtils (extendToFullLines,
extractTextInRange,
subRange)
import Ide.Types
import Language.LSP.Protocol.Message (Method (..),
SMethod (..))
import Language.LSP.Protocol.Types (ApplyWorkspaceEditParams (..),
CodeAction (..),
CodeActionKind (CodeActionKind_QuickFix),
CodeActionParams (CodeActionParams),
Command,
Diagnostic (..),
MessageType (..),
Null (Null),
ShowMessageParams (..),
TextDocumentIdentifier (TextDocumentIdentifier),
TextEdit (TextEdit, _range),
UInt,
WorkspaceEdit (WorkspaceEdit, _changeAnnotations, _changes, _documentChanges),
type (|?) (InL, InR),
uriToFilePath)
import Language.LSP.VFS (virtualFileText)
import qualified Text.Fuzzy.Parallel as TFP
import qualified Text.Regex.Applicative as RE
import Text.Regex.TDFA ((=~), (=~~))
-- See Note [Guidelines For Using CPP In GHCIDE Import Statements]
#if !MIN_VERSION_ghc(9,9,0)
import Development.IDE.GHC.Compat.ExactPrint (makeDeltaAst)
import GHC (Anchor (anchor_op),
AnchorOperation (..),
EpaLocation (..))
#endif
#if MIN_VERSION_ghc(9,9,0)
import GHC (EpaLocation,
EpaLocation' (..),
HasLoc (..))
import GHC.Types.SrcLoc (srcSpanToRealSrcSpan)
#endif
-------------------------------------------------------------------------------------------------
-- | Generate code actions.
codeAction :: PluginMethodHandler IdeState 'Method_TextDocumentCodeAction
codeAction state _ (CodeActionParams _ _ (TextDocumentIdentifier uri) range _) = do
contents <- lift $ pluginGetVirtualFile $ toNormalizedUri uri
liftIO $ do
let text = virtualFileText <$> contents
mbFile = toNormalizedFilePath' <$> uriToFilePath uri
allDiags <- atomically $ fmap (\(_, _, d) -> d) . filter (\(p, _, _) -> mbFile == Just p) <$> getDiagnostics state
(join -> parsedModule) <- runAction "GhcideCodeActions.getParsedModule" state $ getParsedModule `traverse` mbFile
let
actions = caRemoveRedundantImports parsedModule text allDiags range uri
<> caRemoveInvalidExports parsedModule text allDiags range uri
pure $ InL actions
-------------------------------------------------------------------------------------------------
iePluginDescriptor :: Recorder (WithPriority E.Log) -> PluginId -> PluginDescriptor IdeState
iePluginDescriptor recorder plId =
let old =
mkGhcideCAsPlugin [
wrap suggestExportUnusedTopBinding
, wrap suggestModuleTypo
, wrap suggestFixConstructorImport
, wrap suggestExtendImport
, wrap suggestImportDisambiguation
, wrap suggestNewOrExtendImportForClassMethod
, wrap suggestHideShadow
, wrap suggestNewImport
, wrap suggestAddRecordFieldImport
]
plId
"Provides various quick fixes"
in mkExactprintPluginDescriptor recorder $ old {pluginHandlers = pluginHandlers old <> mkPluginHandler SMethod_TextDocumentCodeAction codeAction }
typeSigsPluginDescriptor :: Recorder (WithPriority E.Log) -> PluginId -> PluginDescriptor IdeState
typeSigsPluginDescriptor recorder plId = mkExactprintPluginDescriptor recorder $
mkGhcideCAsPlugin [
wrap $ suggestSignature True
, wrap suggestFillTypeWildcard
, wrap suggestAddTypeAnnotationToSatisfyConstraints
, wrap removeRedundantConstraints
, wrap suggestConstraint
]
plId
"Provides various quick fixes for type signatures"
bindingsPluginDescriptor :: Recorder (WithPriority E.Log) -> PluginId -> PluginDescriptor IdeState
bindingsPluginDescriptor recorder plId = mkExactprintPluginDescriptor recorder $
mkGhcideCAsPlugin [
wrap suggestReplaceIdentifier
, wrap suggestImplicitParameter
, wrap suggestNewDefinition
, wrap Development.IDE.Plugin.Plugins.AddArgument.plugin
, wrap suggestDeleteUnusedBinding
]
plId
"Provides various quick fixes for bindings"
fillHolePluginDescriptor :: Recorder (WithPriority E.Log) -> PluginId -> PluginDescriptor IdeState
fillHolePluginDescriptor recorder plId = mkExactprintPluginDescriptor recorder (mkGhcideCAPlugin (wrap suggestFillHole) plId "Provides a code action to fill a hole")
extendImportPluginDescriptor :: Recorder (WithPriority E.Log) -> PluginId -> PluginDescriptor IdeState
extendImportPluginDescriptor recorder plId = mkExactprintPluginDescriptor recorder $ (defaultPluginDescriptor plId "Provides a command to extend the import list")
{ pluginCommands = [extendImportCommand] }
-- | Add the ability for a plugin to call GetAnnotatedParsedSource
mkExactprintPluginDescriptor :: Recorder (WithPriority E.Log) -> PluginDescriptor a -> PluginDescriptor a
mkExactprintPluginDescriptor recorder desc = desc { pluginRules = pluginRules desc >> getAnnotatedParsedSourceRule recorder }
-------------------------------------------------------------------------------------------------
extendImportCommand :: PluginCommand IdeState
extendImportCommand =
PluginCommand (CommandId extendImportCommandId) "additional edits for a completion" extendImportHandler
extendImportHandler :: CommandFunction IdeState ExtendImport
extendImportHandler ideState _ edit@ExtendImport {..} = ExceptT $ do
res <- liftIO $ runMaybeT $ extendImportHandler' ideState edit
whenJust res $ \(nfp, wedit@WorkspaceEdit {_changes}) -> do
whenJust (listToMaybe =<< listToMaybe . M.elems =<< _changes) $ \TextEdit {_range} -> do
let srcSpan = rangeToSrcSpan nfp _range
pluginSendNotification SMethod_WindowShowMessage $
ShowMessageParams MessageType_Info $
"Import "
<> maybe ("‘" <> newThing) (\x -> "‘" <> x <> " (" <> newThing <> ")") thingParent
<> "’ from "
<> importName
<> " (at "
<> printOutputable srcSpan
<> ")"
void $ pluginSendRequest SMethod_WorkspaceApplyEdit (ApplyWorkspaceEditParams Nothing wedit) (\_ -> pure ())
return $ Right $ InR Null
extendImportHandler' :: IdeState -> ExtendImport -> MaybeT IO (NormalizedFilePath, WorkspaceEdit)
extendImportHandler' ideState ExtendImport {..}
| Just fp <- uriToFilePath doc,
nfp <- toNormalizedFilePath' fp =
do
(ModSummaryResult {..}, ps, contents) <- MaybeT $ liftIO $
runAction "extend import" ideState $
runMaybeT $ do
-- We want accurate edits, so do not use stale data here
msr <- MaybeT $ use GetModSummaryWithoutTimestamps nfp
ps <- MaybeT $ use GetAnnotatedParsedSource nfp
(_, contents) <- MaybeT $ use GetFileContents nfp
return (msr, ps, contents)
let df = ms_hspp_opts msrModSummary
wantedModule = mkModuleName (T.unpack importName)
wantedQual = mkModuleName . T.unpack <$> importQual
existingImport = find (isWantedModule wantedModule wantedQual) msrImports
case existingImport of
Just imp -> do
fmap (nfp,) $ liftEither $
rewriteToWEdit df doc $
extendImport (T.unpack <$> thingParent) (T.unpack newThing)
#if MIN_VERSION_ghc(9,9,0)
imp
#else
(makeDeltaAst imp)
#endif
Nothing -> do
let qns = (,) <$> importQual <*> Just (qualifiedImportStyle df)
n = newImport importName sym qns False
sym = if isNothing importQual then Just it else Nothing
it = case thingParent of
Nothing -> newThing
Just p -> p <> "(" <> newThing <> ")"
t <- liftMaybe $ snd <$> newImportToEdit n ps (fromMaybe "" contents)
return (nfp, WorkspaceEdit {_changes=Just (M.singleton doc [t]), _documentChanges=Nothing, _changeAnnotations=Nothing})
| otherwise =
mzero
isWantedModule :: ModuleName -> Maybe ModuleName -> GenLocated l (ImportDecl GhcPs) -> Bool
isWantedModule wantedModule Nothing (L _ it@ImportDecl{ ideclName
#if MIN_VERSION_ghc(9,5,0)
, ideclImportList = Just (Exactly, _)
#else
, ideclHiding = Just (False, _)
#endif
}) =
not (isQualifiedImport it) && unLoc ideclName == wantedModule
isWantedModule wantedModule (Just qual) (L _ ImportDecl{ ideclAs, ideclName
#if MIN_VERSION_ghc(9,5,0)
, ideclImportList = Just (Exactly, _)
#else
, ideclHiding = Just (False, _)
#endif
}) =
unLoc ideclName == wantedModule && (wantedModule == qual || (unLoc <$> ideclAs) == Just qual)
isWantedModule _ _ _ = False
liftMaybe :: Monad m => Maybe a -> MaybeT m a
liftMaybe a = MaybeT $ pure a
liftEither :: Monad m => Either e a -> MaybeT m a
liftEither (Left _) = mzero
liftEither (Right x) = return x
-------------------------------------------------------------------------------------------------
findSigOfDecl :: p ~ GhcPass p0 => (IdP p -> Bool) -> [LHsDecl p] -> Maybe (Sig p)
findSigOfDecl pred decls =
listToMaybe
[ sig
| L _ (SigD _ sig@(TypeSig _ idsSig _)) <- decls,
any (pred . unLoc) idsSig
]
findSigOfDeclRanged :: forall p p0 . p ~ GhcPass p0 => Range -> [LHsDecl p] -> Maybe (Sig p)
findSigOfDeclRanged range decls = do
dec <- findDeclContainingLoc (_start range) decls
case dec of
L _ (SigD _ sig@TypeSig {}) -> Just sig
L _ (ValD _ (bind :: HsBind p)) -> findSigOfBind range bind
_ -> Nothing
findSigOfBind :: forall p p0. p ~ GhcPass p0 => Range -> HsBind p -> Maybe (Sig p)
findSigOfBind range bind =
case bind of
FunBind {} -> findSigOfLMatch (unLoc $ mg_alts (fun_matches bind))
_ -> Nothing
where
findSigOfLMatch :: [LMatch p (LHsExpr p)] -> Maybe (Sig p)
findSigOfLMatch ls = do
match <- findDeclContainingLoc (_start range) ls
let grhs = m_grhss $ unLoc match
msum
[findSigOfBinds range (grhssLocalBinds grhs) -- where clause
, do
grhs <- findDeclContainingLoc (_start range) (grhssGRHSs grhs)
case unLoc grhs of
GRHS _ _ bd -> findSigOfExpr (unLoc bd)
]
findSigOfExpr :: HsExpr p -> Maybe (Sig p)
findSigOfExpr = go
where
#if !MIN_VERSION_ghc(9,9,0)
go (HsLet _ _ binds _ _) = findSigOfBinds range binds
#else
go (HsLet _ binds _) = findSigOfBinds range binds
#endif
go (HsDo _ _ stmts) = do
stmtlr <- unLoc <$> findDeclContainingLoc (_start range) (unLoc stmts)
case stmtlr of
LetStmt _ lhsLocalBindsLR -> findSigOfBinds range lhsLocalBindsLR
_ -> Nothing
go _ = Nothing
findSigOfBinds :: p ~ GhcPass p0 => Range -> HsLocalBinds p -> Maybe (Sig p)
findSigOfBinds range = go
where
go (HsValBinds _ (ValBinds _ binds lsigs)) =
case unLoc <$> findDeclContainingLoc (_start range) lsigs of
Just sig' -> Just sig'
Nothing -> do
lHsBindLR <- findDeclContainingLoc (_start range) (bagToList binds)
findSigOfBind range (unLoc lHsBindLR)
go _ = Nothing
findInstanceHead :: (Outputable (HsType p), p ~ GhcPass p0) => DynFlags -> String -> [LHsDecl p] -> Maybe (LHsType p)
findInstanceHead df instanceHead decls =
listToMaybe
[ hsib_body
| L _ (InstD _ (ClsInstD _ ClsInstDecl {cid_poly_ty = (unLoc -> HsSig {sig_body = hsib_body})})) <- decls,
showSDoc df (ppr hsib_body) == instanceHead
]
#if MIN_VERSION_ghc(9,9,0)
findDeclContainingLoc :: (Foldable t, HasLoc l) => Position -> t (GenLocated l e) -> Maybe (GenLocated l e)
#else
findDeclContainingLoc :: Foldable t => Position -> t (GenLocated (SrcSpanAnn' a) e) -> Maybe (GenLocated (SrcSpanAnn' a) e)
#endif
findDeclContainingLoc loc = find (\(L l _) -> loc `isInsideSrcSpan` locA l)
-- Single:
-- This binding for ‘mod’ shadows the existing binding
-- imported from ‘Prelude’ at haskell-language-server/ghcide/src/Development/IDE/Plugin/CodeAction.hs:10:8-40
-- (and originally defined in ‘GHC.Real’)typecheck(-Wname-shadowing)
-- Multi:
--This binding for ‘pack’ shadows the existing bindings
-- imported from ‘Data.ByteString’ at B.hs:6:1-22
-- imported from ‘Data.ByteString.Lazy’ at B.hs:8:1-27
-- imported from ‘Data.Text’ at B.hs:7:1-16
suggestHideShadow :: ParsedSource -> T.Text -> Maybe TcModuleResult -> Maybe HieAstResult -> Diagnostic -> [(T.Text, [Either TextEdit Rewrite])]
suggestHideShadow ps fileContents mTcM mHar Diagnostic {_message, _range}
| Just [identifier, modName, s] <-
matchRegexUnifySpaces
_message
"This binding for ‘([^`]+)’ shadows the existing binding imported from ‘([^`]+)’ at ([^ ]*)" =
suggests identifier modName s
| Just [identifier] <-
matchRegexUnifySpaces
_message
"This binding for ‘([^`]+)’ shadows the existing bindings",
Just matched <- allMatchRegexUnifySpaces _message "imported from ‘([^’]+)’ at ([^ ]*)",
mods <- [(modName, s) | [_, modName, s] <- matched],
result <- nubOrdBy (compare `on` fst) $ mods >>= uncurry (suggests identifier),
hideAll <- ("Hide " <> identifier <> " from all occurrence imports", concatMap snd result) =
result <> [hideAll]
| otherwise = []
where
L _ HsModule {hsmodImports} = ps
suggests identifier modName s
| Just tcM <- mTcM,
Just har <- mHar,
[s'] <- [x | (x, "") <- readSrcSpan $ T.unpack s],
isUnusedImportedId tcM har (T.unpack identifier) (T.unpack modName) (RealSrcSpan s' Nothing),
mDecl <- findImportDeclByModuleName hsmodImports $ T.unpack modName,
title <- "Hide " <> identifier <> " from " <> modName =
if modName == "Prelude" && null mDecl
then maybeToList $ (\(_, te) -> (title, [Left te])) <$> newImportToEdit (hideImplicitPreludeSymbol identifier) ps fileContents
else maybeToList $ (title,) . pure . pure . hideSymbol (T.unpack identifier) <$> mDecl
| otherwise = []
findImportDeclByModuleName :: [LImportDecl GhcPs] -> String -> Maybe (LImportDecl GhcPs)
findImportDeclByModuleName decls modName = flip find decls $ \case
(L _ ImportDecl {..}) -> modName == moduleNameString (unLoc ideclName)
isTheSameLine :: SrcSpan -> SrcSpan -> Bool
isTheSameLine s1 s2
| Just sl1 <- getStartLine s1,
Just sl2 <- getStartLine s2 =
sl1 == sl2
| otherwise = False
where
getStartLine x = srcLocLine . realSrcSpanStart <$> realSpan x
isUnusedImportedId :: TcModuleResult -> HieAstResult -> String -> String -> SrcSpan -> Bool
isUnusedImportedId
TcModuleResult {tmrTypechecked = TcGblEnv {tcg_imports = ImportAvails {imp_mods}}}
HAR {refMap}
identifier
modName
importSpan
| occ <- mkVarOcc identifier,
impModsVals <- importedByUser . concat $ moduleEnvElts imp_mods,
Just rdrEnv <-
listToMaybe
[ imv_all_exports
| ImportedModsVal {..} <- impModsVals,
imv_name == mkModuleName modName,
isTheSameLine imv_span importSpan
],
[GRE {gre_name = name}] <- lookupGlobalRdrEnv rdrEnv occ,
importedIdentifier <- Right name,
refs <- M.lookup importedIdentifier refMap =
maybe True (not . any (\(_, IdentifierDetails {..}) -> identInfo == S.singleton Use)) refs
| otherwise = False
suggestRemoveRedundantImport :: ParsedModule -> Maybe T.Text -> Diagnostic -> [(T.Text, [TextEdit])]
suggestRemoveRedundantImport ParsedModule{pm_parsed_source = L _ HsModule{hsmodImports}} contents Diagnostic{_range=_range,..}
-- The qualified import of ‘many’ from module ‘Control.Applicative’ is redundant
| Just [_, bindings] <- matchRegexUnifySpaces _message "The( qualified)? import of ‘([^’]*)’ from module [^ ]* is redundant"
, Just (L _ impDecl) <- find (\(L (locA -> l) _) -> _start _range `isInsideSrcSpan` l && _end _range `isInsideSrcSpan` l ) hsmodImports
, Just c <- contents
, ranges <- map (rangesForBindingImport impDecl . T.unpack) (T.splitOn ", " bindings >>= trySplitIntoOriginalAndRecordField)
, ranges' <- extendAllToIncludeCommaIfPossible False (indexedByPosition $ T.unpack c) (concat ranges)
, not (null ranges')
= [( "Remove " <> bindings <> " from import" , [ TextEdit r "" | r <- ranges' ] )]
-- File.hs:16:1: warning:
-- The import of `Data.List' is redundant
-- except perhaps to import instances from `Data.List'
-- To import instances alone, use: import Data.List()
| _message =~ ("The( qualified)? import of [^ ]* is redundant" :: String)
= [("Remove import", [TextEdit (extendToWholeLineIfPossible contents _range) ""])]
| otherwise = []
where
-- In case of an unused record field import, the binding from the message will not match any import directly
-- In this case, we try if we can additionally extract a record field name
-- Example: The import of ‘B(b2)’ from module ‘ModuleB’ is redundant
trySplitIntoOriginalAndRecordField :: T.Text -> [T.Text]
trySplitIntoOriginalAndRecordField binding =
case matchRegexUnifySpaces binding "([^ ]+)\\(([^)]+)\\)" of
Just [_, fields] -> [binding, fields]
_ -> [binding]
diagInRange :: Diagnostic -> Range -> Bool
diagInRange Diagnostic {_range = dr} r = dr `subRange` extendedRange
where
-- Ensures the range captures full lines. Makes it easier to trigger the correct
-- "remove redundant" code actions from anywhere on the offending line.
extendedRange = extendToFullLines r
-- Note [Removing imports is preferred]
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- It's good to prefer the remove imports code action because an unused import
-- is likely to be removed and less likely the warning will be disabled.
-- Therefore actions to remove a single or all redundant imports should be
-- preferred, so that the client can prioritize them higher.
caRemoveRedundantImports :: Maybe ParsedModule -> Maybe T.Text -> [Diagnostic] -> Range -> Uri -> [Command |? CodeAction]
caRemoveRedundantImports m contents allDiags contextRange uri
| Just pm <- m,
r <- join $ map (\d -> repeat d `zip` suggestRemoveRedundantImport pm contents d) allDiags,
allEdits <- [ e | (_, (_, edits)) <- r, e <- edits],
caRemoveAll <- removeAll allEdits,
ctxEdits <- [ x | x@(d, _) <- r, d `diagInRange` contextRange],
not $ null ctxEdits,
caRemoveCtx <- map (\(d, (title, tedit)) -> removeSingle title tedit d) ctxEdits
= caRemoveCtx ++ [caRemoveAll]
| otherwise = []
where
removeSingle title tedit diagnostic = mkCA title (Just CodeActionKind_QuickFix) Nothing [diagnostic] WorkspaceEdit{..} where
_changes = Just $ M.singleton uri tedit
_documentChanges = Nothing
_changeAnnotations = Nothing
removeAll tedit = InR $ CodeAction{..} where
_changes = Just $ M.singleton uri tedit
_title = "Remove all redundant imports"
_kind = Just CodeActionKind_QuickFix
_diagnostics = Nothing
_documentChanges = Nothing
_edit = Just WorkspaceEdit{..}
-- See Note [Removing imports is preferred]
_isPreferred = Just True
_command = Nothing
_disabled = Nothing
_data_ = Nothing
_changeAnnotations = Nothing
caRemoveInvalidExports :: Maybe ParsedModule -> Maybe T.Text -> [Diagnostic] -> Range -> Uri -> [Command |? CodeAction]
caRemoveInvalidExports m contents allDiags contextRange uri
| Just pm <- m,
Just txt <- contents,
txt' <- indexedByPosition $ T.unpack txt,
r <- mapMaybe (groupDiag pm) allDiags,
r' <- map (\(t,d,rs) -> (t,d,extend txt' rs)) r,
caRemoveCtx <- mapMaybe removeSingle r',
allRanges <- nubOrd $ [ range | (_,_,ranges) <- r, range <- ranges],
allRanges' <- extend txt' allRanges,
Just caRemoveAll <- removeAll allRanges',
ctxEdits <- [ x | x@(_, d, _) <- r, d `diagInRange` contextRange],
not $ null ctxEdits
= caRemoveCtx ++ [caRemoveAll]
| otherwise = []
where
extend txt ranges = extendAllToIncludeCommaIfPossible True txt ranges
groupDiag pm dig
| Just (title, ranges) <- suggestRemoveRedundantExport pm dig
= Just (title, dig, ranges)
| otherwise = Nothing
removeSingle (_, _, []) = Nothing
removeSingle (title, diagnostic, ranges) = Just $ InR $ CodeAction{..} where
tedit = concatMap (\r -> [TextEdit r ""]) $ nubOrd ranges
_changes = Just $ M.singleton uri tedit
_title = title
_kind = Just CodeActionKind_QuickFix
_diagnostics = Just [diagnostic]
_documentChanges = Nothing
_edit = Just WorkspaceEdit{..}
_command = Nothing
-- See Note [Removing imports is preferred]
_isPreferred = Just True
_disabled = Nothing
_data_ = Nothing
_changeAnnotations = Nothing
removeAll [] = Nothing
removeAll ranges = Just $ InR $ CodeAction{..} where
tedit = concatMap (\r -> [TextEdit r ""]) ranges
_changes = Just $ M.singleton uri tedit
_title = "Remove all redundant exports"
_kind = Just CodeActionKind_QuickFix
_diagnostics = Nothing
_documentChanges = Nothing
_edit = Just WorkspaceEdit{..}
_command = Nothing
-- See Note [Removing imports is preferred]
_isPreferred = Just True
_disabled = Nothing
_data_ = Nothing
_changeAnnotations = Nothing
suggestRemoveRedundantExport :: ParsedModule -> Diagnostic -> Maybe (T.Text, [Range])
suggestRemoveRedundantExport ParsedModule{pm_parsed_source = L _ HsModule{..}} Diagnostic{..}
| msg <- unifySpaces _message
, Just export <- hsmodExports
, Just exportRange <- getLocatedRange export
, exports <- unLoc export
, Just (removeFromExport, !ranges) <- fmap (getRanges exports . notInScope) (extractNotInScopeName msg)
<|> (,[_range]) <$> matchExportItem msg
<|> (,[_range]) <$> matchDupExport msg
, subRange _range exportRange
= Just ("Remove ‘" <> removeFromExport <> "’ from export", ranges)
where
matchExportItem msg = regexSingleMatch msg "The export item ‘([^’]+)’"
matchDupExport msg = regexSingleMatch msg "Duplicate ‘([^’]+)’ in export list"
getRanges exports txt = case smallerRangesForBindingExport exports (T.unpack txt) of
[] -> (txt, [_range])
ranges -> (txt, ranges)
suggestRemoveRedundantExport _ _ = Nothing
suggestDeleteUnusedBinding :: ParsedModule -> Maybe T.Text -> Diagnostic -> [(T.Text, [TextEdit])]
suggestDeleteUnusedBinding
ParsedModule{pm_parsed_source = L _ HsModule{hsmodDecls}}
contents
Diagnostic{_range=_range,..}
-- Foo.hs:4:1: warning: [-Wunused-binds] Defined but not used: ‘f’
| Just [name] <- matchRegexUnifySpaces _message ".*Defined but not used: ‘([^ ]+)’"
, Just indexedContent <- indexedByPosition . T.unpack <$> contents
= let edits = flip TextEdit "" <$> relatedRanges indexedContent (T.unpack name)
in ([("Delete ‘" <> name <> "’", edits) | not (null edits)])
| otherwise = []
where
relatedRanges indexedContent name =
concatMap (findRelatedSpans indexedContent name . reLoc) hsmodDecls
toRange = realSrcSpanToRange
extendForSpaces = extendToIncludePreviousNewlineIfPossible
findRelatedSpans :: PositionIndexedString -> String -> Located (HsDecl GhcPs) -> [Range]
findRelatedSpans
indexedContent
name
(L (RealSrcSpan l _) (ValD _ (extractNameAndMatchesFromFunBind -> Just (lname, matches)))) =
case lname of
(L nLoc _name) | isTheBinding nLoc ->
let findSig (L (RealSrcSpan l _) (SigD _ sig)) = findRelatedSigSpan indexedContent name l sig
findSig _ = []
in
extendForSpaces indexedContent (toRange l) :
concatMap (findSig . reLoc) hsmodDecls
_ -> concatMap (findRelatedSpanForMatch indexedContent name) matches
findRelatedSpans _ _ _ = []
extractNameAndMatchesFromFunBind
:: HsBind GhcPs
-> Maybe (Located (IdP GhcPs), [LMatch GhcPs (LHsExpr GhcPs)])
extractNameAndMatchesFromFunBind
FunBind
{ fun_id=lname
, fun_matches=MG {mg_alts=L _ matches}
} = Just (reLoc lname, matches)
extractNameAndMatchesFromFunBind _ = Nothing
findRelatedSigSpan :: PositionIndexedString -> String -> RealSrcSpan -> Sig GhcPs -> [Range]
findRelatedSigSpan indexedContent name l sig =
let maybeSpan = findRelatedSigSpan1 name sig
in case maybeSpan of
Just (_span, True) -> pure $ extendForSpaces indexedContent $ toRange l -- a :: Int
Just (RealSrcSpan span _, False) -> pure $ toRange span -- a, b :: Int, a is unused
_ -> []
-- Second of the tuple means there is only one match
findRelatedSigSpan1 :: String -> Sig GhcPs -> Maybe (SrcSpan, Bool)
findRelatedSigSpan1 name (TypeSig _ lnames _) =
let maybeIdx = findIndex (\(L _ id) -> isSameName id name) lnames
in case maybeIdx of
Nothing -> Nothing
Just _ | [lname] <- lnames -> Just (getLoc lname, True)
Just idx ->
let targetLname = getLoc $ lnames !! idx
startLoc = srcSpanStart targetLname
endLoc = srcSpanEnd targetLname
startLoc' = if idx == 0
then startLoc
else srcSpanEnd . getLoc $ lnames !! (idx - 1)
endLoc' = if idx == 0 && idx < length lnames - 1
then srcSpanStart . getLoc $ lnames !! (idx + 1)
else endLoc
in Just (mkSrcSpan startLoc' endLoc', False)
findRelatedSigSpan1 _ _ = Nothing
-- for where clause
findRelatedSpanForMatch
:: PositionIndexedString
-> String
-> LMatch GhcPs (LHsExpr GhcPs)
-> [Range]
findRelatedSpanForMatch
indexedContent
name
(L _ Match{m_grhss=GRHSs{grhssLocalBinds}}) = do
let go bag lsigs =
if isEmptyBag bag
then []
else concatMap (findRelatedSpanForHsBind indexedContent name lsigs) bag
case grhssLocalBinds of
(HsValBinds _ (ValBinds _ bag lsigs)) -> go bag lsigs
_ -> []
findRelatedSpanForHsBind
:: PositionIndexedString
-> String
-> [LSig GhcPs]
-> LHsBind GhcPs
-> [Range]
findRelatedSpanForHsBind
indexedContent
name
lsigs
(L (locA -> (RealSrcSpan l _)) (extractNameAndMatchesFromFunBind -> Just (lname, matches))) =
if isTheBinding (getLoc lname)
then
let findSig (L (RealSrcSpan l _) sig) = findRelatedSigSpan indexedContent name l sig
findSig _ = []
in extendForSpaces indexedContent (toRange l) : concatMap (findSig . reLoc) lsigs
else concatMap (findRelatedSpanForMatch indexedContent name) matches
findRelatedSpanForHsBind _ _ _ _ = []
isTheBinding :: SrcSpan -> Bool
isTheBinding span = srcSpanToRange span == Just _range
isSameName :: IdP GhcPs -> String -> Bool
isSameName x name = T.unpack (printOutputable x) == name
data ExportsAs = ExportName | ExportPattern | ExportFamily | ExportAll
deriving (Eq)
getLocatedRange :: HasSrcSpan a => a -> Maybe Range
getLocatedRange = srcSpanToRange . getLoc
suggestExportUnusedTopBinding :: Maybe T.Text -> ParsedModule -> Diagnostic -> Maybe (T.Text, TextEdit)
suggestExportUnusedTopBinding srcOpt ParsedModule{pm_parsed_source = L _ HsModule{..}} Diagnostic{..}
-- Foo.hs:4:1: warning: [-Wunused-top-binds] Defined but not used: ‘f’
-- Foo.hs:5:1: warning: [-Wunused-top-binds] Defined but not used: type constructor or class ‘F’
-- Foo.hs:6:1: warning: [-Wunused-top-binds] Defined but not used: data constructor ‘Bar’
| Just source <- srcOpt
, Just [_, name] <-
matchRegexUnifySpaces
_message
".*Defined but not used: (type constructor or class |data constructor )?‘([^ ]+)’"
, Just (exportType, _) <-
find (matchWithDiagnostic _range . snd)
. mapMaybe (\(L l b) -> if isTopLevel (locA l) then exportsAs b else Nothing)
$ hsmodDecls
, Just exports <- fmap (fmap reLoc) . reLoc <$> hsmodExports
, Just exportsEndPos <- _end <$> getLocatedRange exports
, let name' = printExport exportType name
sep = exportSep source $ map getLocatedRange <$> exports
exportName = case sep of
Nothing -> (if needsComma source exports then ", " else "") <> name'
Just s -> s <> name'
exportsEndPos' = exportsEndPos { _character = pred $ _character exportsEndPos }
insertPos = fromMaybe exportsEndPos' $ case (sep, unLoc exports) of
(Just _, exports'@(_:_)) -> fmap _end . getLocatedRange $ last exports'
_ -> Nothing
= Just ("Export ‘" <> name <> "’", TextEdit (Range insertPos insertPos) exportName)
| otherwise = Nothing
where
exportSep :: T.Text -> Located [Maybe Range] -> Maybe T.Text
exportSep src (L (RealSrcSpan _ _) xs@(_ : tl@(_ : _))) =
case mapMaybe (\(e, s) -> (,) <$> e <*> s) $ zip (fmap _end <$> xs) (fmap _start <$> tl) of
[] -> Nothing
bounds -> Just smallestSep
where
smallestSep
= snd
$ minimumBy (comparing fst)
$ map (T.length &&& id)
$ nubOrd
$ map (\(prevEnd, nextStart) -> textInRange (Range prevEnd nextStart) src) bounds
exportSep _ _ = Nothing
-- We get the last export and the closing bracket and check for comma in that range.
needsComma :: T.Text -> Located [Located (IE GhcPs)] -> Bool
needsComma _ (L _ []) = False
needsComma source (L (RealSrcSpan l _) exports) =
let closeParen = _end $ realSrcSpanToRange l
lastExport = fmap _end . getLocatedRange $ last exports
in
case lastExport of
Just lastExport ->
not $ T.any (== ',') $ textInRange (Range lastExport closeParen) source
_ -> False
needsComma _ _ = False
opLetter :: T.Text
opLetter = ":!#$%&*+./<=>?@\\^|-~"
parenthesizeIfNeeds :: Bool -> T.Text -> T.Text
parenthesizeIfNeeds needsTypeKeyword x
| T.any (c ==) opLetter = (if needsTypeKeyword then "type " else "") <> "(" <> x <> ")"
| otherwise = x
where
c = T.head x
matchWithDiagnostic :: Range -> Located (IdP GhcPs) -> Bool
matchWithDiagnostic Range{_start=l,_end=r} x =
let loc = fmap _start . getLocatedRange $ x
in loc >= Just l && loc <= Just r
printExport :: ExportsAs -> T.Text -> T.Text
printExport ExportName x = parenthesizeIfNeeds False x
printExport ExportPattern x = "pattern " <> x
printExport ExportFamily x = parenthesizeIfNeeds True x
printExport ExportAll x = parenthesizeIfNeeds True x <> "(..)"
isTopLevel :: SrcSpan -> Bool
isTopLevel span = fmap (_character . _start) (srcSpanToRange span) == Just 0
exportsAs :: HsDecl GhcPs -> Maybe (ExportsAs, Located (IdP GhcPs))
exportsAs (ValD _ FunBind {fun_id}) = Just (ExportName, reLoc fun_id)
exportsAs (ValD _ (PatSynBind _ PSB {psb_id})) = Just (ExportPattern, reLoc psb_id)
exportsAs (TyClD _ SynDecl{tcdLName}) = Just (ExportName, reLoc tcdLName)
exportsAs (TyClD _ DataDecl{tcdLName}) = Just (ExportAll, reLoc tcdLName)
exportsAs (TyClD _ ClassDecl{tcdLName}) = Just (ExportAll, reLoc tcdLName)
exportsAs (TyClD _ FamDecl{tcdFam}) = Just (ExportFamily, reLoc $ fdLName tcdFam)
exportsAs _ = Nothing
suggestAddTypeAnnotationToSatisfyConstraints :: Maybe T.Text -> Diagnostic -> [(T.Text, [TextEdit])]
suggestAddTypeAnnotationToSatisfyConstraints sourceOpt Diagnostic{_range=_range,..}
-- File.hs:52:41: warning:
-- * Defaulting the following constraint to type ‘Integer’
-- Num p0 arising from the literal ‘1’
-- * In the expression: 1
-- In an equation for ‘f’: f = 1
-- File.hs:52:41: warning:
-- * Defaulting the following constraints to type ‘[Char]’
-- (Show a0)
-- arising from a use of ‘traceShow’
-- at A.hs:228:7-25
-- (IsString a0)
-- arising from the literal ‘"debug"’
-- at A.hs:228:17-23
-- * In the expression: traceShow "debug" a
-- In an equation for ‘f’: f a = traceShow "debug" a
-- File.hs:52:41: warning:
-- * Defaulting the following constraints to type ‘[Char]’
-- (Show a0)
-- arising from a use of ‘traceShow’
-- at A.hs:255:28-43
-- (IsString a0)
-- arising from the literal ‘"test"’
-- at /Users/serhiip/workspace/ghcide/src/Development/IDE/Plugin/CodeAction.hs:255:38-43
-- * In the fourth argument of ‘seq’, namely ‘(traceShow "test")’
-- In the expression: seq "test" seq "test" (traceShow "test")
-- In an equation for ‘f’:
-- f = seq "test" seq "test" (traceShow "test")
--
| Just [ty, lit] <- matchRegexUnifySpaces _message (pat False False True False)
<|> matchRegexUnifySpaces _message (pat False False False True)
<|> matchRegexUnifySpaces _message (pat False False False False)
= codeEdit _range ty lit (makeAnnotatedLit ty lit)
| Just source <- sourceOpt
, Just [ty, lit, srcspan] <- matchRegexUnifySpaces _message (pat True True False False)
, range <- case [ x | (x,"") <- readSrcSpan (T.unpack srcspan)] of
[s] -> let x = realSrcSpanToRange s
in x{_end = (_end x){_character = succ (_character (_end x))}}
_ -> error "bug in srcspan parser"
= let lit' = makeAnnotatedLit ty lit;
tir = textInRange range source
in codeEdit range ty lit (T.replace lit lit' tir)
| otherwise = []
where
makeAnnotatedLit ty lit = "(" <> lit <> " :: " <> ty <> ")"
#if MIN_VERSION_ghc(9,4,0)
pat multiple at inArg inExpr = T.concat [ ".*Defaulting the type variable "
, ".*to type ‘([^ ]+)’ "
, "in the following constraint"
, if multiple then "s" else " "
, ".*arising from the literal ‘(.+)’"
, if inArg then ".+In the.+argument" else ""
, if at then ".+at ([^ ]*)" else ""
, if inExpr then ".+In the expression" else ""
, ".+In the expression"
]
#else
pat multiple at inArg inExpr = T.concat [ ".*Defaulting the following constraint"
, if multiple then "s" else ""
, " to type ‘([^ ]+)’ "
, ".*arising from the literal ‘(.+)’"
, if inArg then ".+In the.+argument" else ""
, if at then ".+at ([^ ]*)" else ""
, if inExpr then ".+In the expression" else ""
, ".+In the expression"
]
#endif
codeEdit range ty lit replacement =
let title = "Add type annotation ‘" <> ty <> "’ to ‘" <> lit <> "’"
edits = [TextEdit range replacement]
in [( title, edits )]
-- | GHC strips out backticks in case of infix functions as well as single quote
-- in case of quoted name when using TemplateHaskellQuotes. Which is not desired.
--
-- For example:
-- 1.
--
-- @
-- File.hs:52:41: error:
-- * Variable not in scope:
-- suggestAcion :: Maybe T.Text -> Range -> Range
-- * Perhaps you meant ‘suggestAction’ (line 83)
-- File.hs:94:37: error:
-- Not in scope: ‘T.isPrfixOf’
-- Perhaps you meant one of these:
-- ‘T.isPrefixOf’ (imported from Data.Text),
-- ‘T.isInfixOf’ (imported from Data.Text),
-- ‘T.isSuffixOf’ (imported from Data.Text)
-- Module ‘Data.Text’ does not export ‘isPrfixOf’.
-- @
--
-- * action: \`suggestAcion\` will be renamed to \`suggestAction\` keeping back ticks around the function
--
-- 2.
--
-- @
-- import Language.Haskell.TH (Name)
-- foo :: Name
-- foo = 'bread
--
-- File.hs:8:7: error:
-- Not in scope: ‘bread’
-- * Perhaps you meant one of these:
-- ‘break’ (imported from Prelude), ‘read’ (imported from Prelude)
-- * In the Template Haskell quotation 'bread
-- @
--
-- * action: 'bread will be renamed to 'break keeping single quote on beginning of name
suggestReplaceIdentifier :: Maybe T.Text -> Diagnostic -> [(T.Text, [TextEdit])]
suggestReplaceIdentifier contents Diagnostic{_range=_range,..}
| renameSuggestions@(_:_) <- extractRenamableTerms _message
= [ ("Replace with ‘" <> name <> "’", [mkRenameEdit contents _range name]) | name <- renameSuggestions ]
| otherwise = []
suggestNewDefinition :: IdeOptions -> ParsedModule -> Maybe T.Text -> Diagnostic -> [(T.Text, [TextEdit])]
suggestNewDefinition ideOptions parsedModule contents Diagnostic {_message, _range}
| Just (name, typ) <- matchVariableNotInScope message =
newDefinitionAction ideOptions parsedModule _range name typ
| Just (name, typ) <- matchFoundHole message,
[(label, newDefinitionEdits)] <- newDefinitionAction ideOptions parsedModule _range name (Just typ) =
[(label, mkRenameEdit contents _range name : newDefinitionEdits)]
| otherwise = []
where
message = unifySpaces _message
newDefinitionAction :: IdeOptions -> ParsedModule -> Range -> T.Text -> Maybe T.Text -> [(T.Text, [TextEdit])]
newDefinitionAction IdeOptions {..} parsedModule Range {_start} name typ
| Range _ lastLineP : _ <-
[ realSrcSpanToRange sp
| (L (locA -> l@(RealSrcSpan sp _)) _) <- hsmodDecls,
_start `isInsideSrcSpan` l
],
nextLineP <- Position {_line = _line lastLineP + 1, _character = 0} =
[ ( "Define " <> sig,
[TextEdit (Range nextLineP nextLineP) (T.unlines ["", sig, name <> " = _"])]
)
]
| otherwise = []
where
colon = if optNewColonConvention then " : " else " :: "
sig = name <> colon <> T.dropWhileEnd isSpace (fromMaybe "_" typ)
ParsedModule {pm_parsed_source = L _ HsModule {hsmodDecls}} = parsedModule
{- Handles two variants with different formatting
1. Could not find module ‘Data.Cha’
Perhaps you meant Data.Char (from base-4.12.0.0)
2. Could not find module ‘Data.I’
Perhaps you meant
Data.Ix (from base-4.14.3.0)
Data.Eq (from base-4.14.3.0)
Data.Int (from base-4.14.3.0)
-}
suggestModuleTypo :: Diagnostic -> [(T.Text, TextEdit)]
suggestModuleTypo Diagnostic{_range=_range,..}
| "Could not find module" `T.isInfixOf` _message =
case T.splitOn "Perhaps you meant" _message of
[_, stuff] ->
[ ("replace with " <> modul, TextEdit _range modul)
| modul <- mapMaybe extractModule (T.lines stuff)
]
_ -> []
| otherwise = []
where
extractModule line = case T.words line of
[modul, "(from", _] -> Just modul
_ -> Nothing
suggestExtendImport :: ExportsMap -> ParsedSource -> Diagnostic -> [(T.Text, CodeActionKind, Rewrite)]
suggestExtendImport exportsMap (L _ HsModule {hsmodImports}) Diagnostic{_range=_range,..}
| Just [binding, mod, srcspan] <-
matchRegexUnifySpaces _message
#if MIN_VERSION_ghc(9,7,0)
"Add ‘([^’]*)’ to the import list in the import of ‘([^’]*)’ *\\(at (.*)\\)\\."
#else
"Perhaps you want to add ‘([^’]*)’ to the import list in the import of ‘([^’]*)’ *\\((.*)\\)\\."
#endif
= suggestions hsmodImports binding mod srcspan
| Just (binding, mod_srcspan) <-
matchRegExMultipleImports _message
= mod_srcspan >>= uncurry (suggestions hsmodImports binding)
| otherwise = []
where
canUseDatacon = case extractNotInScopeName _message of
Just NotInScopeTypeConstructorOrClass{} -> False
_ -> True
suggestions decls binding mod srcspan
| range <- case [ x | (x,"") <- readSrcSpan (T.unpack srcspan)] of
[s] -> let x = realSrcSpanToRange s
in x{_end = (_end x){_character = succ (_character (_end x))}}
_ -> error "bug in srcspan parser",
Just decl <- findImportDeclByRange decls range,
Just ident <- lookupExportMap binding mod
= [ ( "Add " <> renderImportStyle importStyle <> " to the import list of " <> mod
, quickFixImportKind' "extend" importStyle
, uncurry extendImport (unImportStyle importStyle) decl
)
| importStyle <- NE.toList $ importStyles ident
]
| otherwise = []
lookupExportMap binding mod
| let em = getExportsMap exportsMap
#if MIN_VERSION_ghc(9,7,0)
match = mconcat $ lookupOccEnv_AllNameSpaces em (mkVarOrDataOcc binding)
#else
match1 = lookupOccEnv em (mkVarOrDataOcc binding)
match2 = lookupOccEnv em (mkTypeOcc binding)
, Just match <- match1 <> match2