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hls-class-plugin - Add placeholders for all class methods (#3394)
* #3017 WIP: Add Action for all missing class methods * #3017 WIP: Filter out equivalent suggestions * #3017 Fix CodeAction title, adjust tests * #3017 Rename functions * #3017 Update demo gifs * 3017 Stylish-haskell Co-authored-by: Lei Zhu <[email protected]>
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‎plugins/hls-class-plugin/README.md

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@@ -3,7 +3,8 @@
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The class plugin provides handy operations about class, includes:
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1. Code action to add minimal class definition methods.
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2. Type lens about missing type signatures for instance methods.
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2. Code action to all missing class methods.
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3. Type lens about missing type signatures for instance methods.
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## Demo
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‎plugins/hls-class-plugin/codeactions.gif

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‎plugins/hls-class-plugin/codelens.gif

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‎plugins/hls-class-plugin/hls-class-plugin.cabal

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@@ -77,3 +77,4 @@ test-suite tests
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, hls-test-utils ^>=1.5
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, lens
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, lsp-types
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, text

‎plugins/hls-class-plugin/src/Ide/Plugin/Class/CodeAction.hs

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@@ -13,8 +13,10 @@ import Control.Monad.Trans.Class (lift)
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import Control.Monad.Trans.Except (ExceptT, throwE)
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import Control.Monad.Trans.Maybe
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import Data.Aeson
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import Data.Bifunctor (second)
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import Data.Either.Extra (rights)
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import Data.List
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import Data.List.Extra (nubOrdOn)
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import qualified Data.Map.Strict as Map
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import Data.Maybe (isNothing, listToMaybe,
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mapMaybe)
@@ -113,30 +115,31 @@ codeAction recorder state plId (CodeActionParams _ _ docId _ context) = pluginRe
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logWith recorder Info (LogImplementedMethods cls implemented)
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pure
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$ concatMap mkAction
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$ fmap (filter (\(bind, _) -> bind `notElem` implemented))
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$ minDefToMethodGroups range sigs
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$ classMinimalDef cls
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$ nubOrdOn snd
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$ filter ((/=) mempty . snd)
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$ fmap (second (filter (\(bind, _) -> bind `notElem` implemented)))
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$ mkMethodGroups range sigs cls
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where
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range = diag ^. J.range
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mkAction :: [(T.Text, T.Text)] -> [Command |? CodeAction]
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mkAction methodGroup
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mkMethodGroups :: Range -> [InstanceBindTypeSig] -> Class -> [MethodGroup]
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mkMethodGroups range sigs cls = minimalDef <> [allClassMethods]
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where
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minimalDef = minDefToMethodGroups range sigs $ classMinimalDef cls
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allClassMethods = ("all missing methods", makeMethodDefinitions range sigs)
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mkAction :: MethodGroup -> [Command |? CodeAction]
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mkAction (name, methods)
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= [ mkCodeAction title
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$ mkLspCommand plId codeActionCommandId title
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(Just $ mkCmdParams methodGroup False)
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(Just $ mkCmdParams methods False)
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, mkCodeAction titleWithSig
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$ mkLspCommand plId codeActionCommandId titleWithSig
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(Just $ mkCmdParams methodGroup True)
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(Just $ mkCmdParams methods True)
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]
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where
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title = mkTitle $ fst <$> methodGroup
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titleWithSig = mkTitleWithSig $ fst <$> methodGroup
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mkTitle methodGroup
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= "Add placeholders for "
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<> mconcat (intersperse ", " (fmap (\m -> "'" <> m <> "'") methodGroup))
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mkTitleWithSig methodGroup = mkTitle methodGroup <> " with signature(s)"
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title = "Add placeholders for " <> name
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titleWithSig = title <> " with signature(s)"
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mkCmdParams methodGroup withSig =
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[toJSON (AddMinimalMethodsParams uri range (List methodGroup) withSig)]
@@ -211,15 +214,37 @@ isInstanceValBind :: ContextInfo -> Bool
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isInstanceValBind (ValBind InstanceBind _ _) = True
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isInstanceValBind _ = False
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-- Return (name text, signature text)
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minDefToMethodGroups :: Range -> [InstanceBindTypeSig] -> BooleanFormula Name -> [[(T.Text, T.Text)]]
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minDefToMethodGroups range sigs = go
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type MethodSignature = T.Text
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type MethodName = T.Text
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type MethodDefinition = (MethodName, MethodSignature)
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type MethodGroup = (T.Text, [MethodDefinition])
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makeMethodDefinition :: InstanceBindTypeSig -> MethodDefinition
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makeMethodDefinition sig = (name, signature)
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where
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name = T.drop (T.length bindingPrefix) (printOutputable (bindName sig))
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signature = bindRendered sig
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makeMethodDefinitions :: Range -> [InstanceBindTypeSig] -> [MethodDefinition]
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makeMethodDefinitions range sigs =
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[ makeMethodDefinition sig
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| sig <- sigs
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, inRange range (getSrcSpan $ bindName sig)
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]
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signatureToName :: InstanceBindTypeSig -> T.Text
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signatureToName sig = T.drop (T.length bindingPrefix) (printOutputable (bindName sig))
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-- Return [groupName text, [(methodName text, signature text)]]
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minDefToMethodGroups :: Range -> [InstanceBindTypeSig] -> BooleanFormula Name -> [MethodGroup]
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minDefToMethodGroups range sigs minDef = makeMethodGroup <$> go minDef
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where
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go (Var mn) = [[ (T.pack . occNameString . occName $ mn, bindRendered sig)
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| sig <- sigs
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, inRange range (getSrcSpan $ bindName sig)
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, printOutputable mn == T.drop (T.length bindingPrefix) (printOutputable (bindName sig))
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]]
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makeMethodGroup methodDefinitions =
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let name = mconcat $ intersperse "," $ (\x -> "'" <> x <> "'") . fst <$> methodDefinitions
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in (name, methodDefinitions)
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go (Var mn) = pure $ makeMethodDefinitions range $ filter ((==) (printOutputable mn) . signatureToName) sigs
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go (Or ms) = concatMap (go . unLoc) ms
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go (And ms) = foldr (liftA2 (<>)) [[]] (fmap (go . unLoc) ms)
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go (Parens m) = go (unLoc m)
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‎plugins/hls-class-plugin/test/Main.hs

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@@ -12,6 +12,7 @@ module Main
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import Control.Lens (Prism', prism', (^.), (^..), (^?))
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import Control.Monad (void)
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import Data.Maybe
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import qualified Data.Text as T
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import qualified Ide.Plugin.Class as Class
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import qualified Language.LSP.Types.Lens as J
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import System.FilePath
@@ -31,23 +32,21 @@ tests = testGroup
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codeActionTests :: TestTree
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codeActionTests = testGroup
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"code actions"
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[ testCase "Produces addMinimalMethodPlaceholders code actions for one instance" $ do
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runSessionWithServer classPlugin testDataDir $ do
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doc <- openDoc "T1.hs" "haskell"
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_ <- waitForDiagnosticsFromSource doc "typecheck"
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caResults <- getAllCodeActions doc
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liftIO $ map (^? _CACodeAction . J.title) caResults
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@?=
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[ Just "Add placeholders for '=='"
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, Just "Add placeholders for '==' with signature(s)"
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, Just "Add placeholders for '/='"
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, Just "Add placeholders for '/=' with signature(s)"
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]
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[ expectCodeActionsAvailable "Produces addMinimalMethodPlaceholders code actions for one instance" "T1"
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[ "Add placeholders for '=='"
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, "Add placeholders for '==' with signature(s)"
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, "Add placeholders for '/='"
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, "Add placeholders for '/=' with signature(s)"
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, "Add placeholders for all missing methods"
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, "Add placeholders for all missing methods with signature(s)"
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]
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, goldenWithClass "Creates a placeholder for '=='" "T1" "eq" $ \(eqAction:_) -> do
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executeCodeAction eqAction
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, goldenWithClass "Creates a placeholder for '/='" "T1" "ne" $ \(_:_:neAction:_) -> do
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executeCodeAction neAction
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, goldenWithClass "Creates a placeholder for 'fmap'" "T2" "fmap" $ \(_:_:_:_:fmapAction:_) -> do
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, goldenWithClass "Creates a placeholder for both '==' and '/='" "T1" "all" $ \(_:_:_:_:allMethodsAction:_) -> do
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executeCodeAction allMethodsAction
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, goldenWithClass "Creates a placeholder for 'fmap'" "T2" "fmap" $ \(_:_:_:_:_:_:fmapAction:_) -> do
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executeCodeAction fmapAction
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, goldenWithClass "Creates a placeholder for multiple methods 1" "T3" "1" $ \(mmAction:_) -> do
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executeCodeAction mmAction
@@ -70,6 +69,11 @@ codeActionTests = testGroup
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executeCodeAction eqWithSig
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, goldenWithClass "Only insert pragma once" "InsertPragmaOnce" "" $ \(_:multi:_) -> do
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executeCodeAction multi
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, expectCodeActionsAvailable "No code action available when minimal requirements meet" "MinimalDefinitionMeet" []
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, expectCodeActionsAvailable "Add placeholders for all missing methods is unavailable when all methods are required" "AllMethodsRequired"
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[ "Add placeholders for 'f','g'"
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, "Add placeholders for 'f','g' with signature(s)"
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]
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]
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codeLensTests :: TestTree
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InR action -> Just action
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_ -> Nothing
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goldenCodeLens :: TestName -> FilePath -> Int -> TestTree
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goldenCodeLens title path idx =
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goldenWithHaskellDoc classPlugin title testDataDir path "expected" "hs" $ \doc -> do
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act actions
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void $ skipManyTill anyMessage (getDocumentEdit doc)
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expectCodeActionsAvailable :: TestName -> FilePath -> [T.Text] -> TestTree
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expectCodeActionsAvailable title path actionTitles =
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testCase title $ do
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runSessionWithServer classPlugin testDataDir $ do
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doc <- openDoc (path <.> "hs") "haskell"
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_ <- waitForDiagnosticsFromSource doc "typecheck"
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caResults <- getAllCodeActions doc
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liftIO $ map (^? _CACodeAction . J.title) caResults
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@?= expectedActions
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where
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expectedActions = Just <$> actionTitles
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testDataDir :: FilePath
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testDataDir = "test" </> "testdata"

‎plugins/hls-class-plugin/test/testdata/AllMethodsRequired.hs

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module AllMethodsRequired where
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class Test a where
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f :: a
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g :: a
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{-# MINIMAL f,g #-}
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instance Test [a] where
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‎plugins/hls-class-plugin/test/testdata/MinimalDefinitionMeet.hs

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module MinimalDefinitionMeet where
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data X = X
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instance Eq X where
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(==) = _

‎plugins/hls-class-plugin/test/testdata/T1.all.expected.hs

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module T1 where
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data X = X
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instance Eq X where
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(==) = _
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(/=) = _

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