Add "autogen-" field completions and tests for cabal files

plugins/hls-cabal-plugin/src/Ide/Plugin/Cabal/Completion/Completer/Paths.hs

@@ -7,6 +7,7 @@ import           Distribution.PackageDescription   (Benchmark (..),
                                                     BuildInfo (..),
                                                     CondTree (condTreeData),
                                                     Executable (..),
+                                                    ForeignLib (..),
                                                     GenericPackageDescription (..),
                                                     Library (..),
                                                     UnqualComponentName,
@@ -118,6 +119,10 @@ sourceDirsExtractionTestSuite name gpd = extractRelativeDirsFromStanza name gpd
 sourceDirsExtractionBenchmark :: Maybe StanzaName -> GenericPackageDescription -> [FilePath]
 sourceDirsExtractionBenchmark name gpd = extractRelativeDirsFromStanza name gpd condBenchmarks benchmarkBuildInfo
 
+-- | Extracts the source directories of foreign-lib stanza with the given name.
+sourceDirsExtractionForeignLib :: Maybe StanzaName -> GenericPackageDescription -> [FilePath]
+sourceDirsExtractionForeignLib name gpd = extractRelativeDirsFromStanza name gpd condForeignLibs foreignLibBuildInfo
+
 {- | Takes a possible stanza name, a GenericPackageDescription,
   a function to access the stanza information we are interested in
   and a function to access the build info from the specific stanza.

plugins/hls-cabal-plugin/src/Ide/Plugin/Cabal/Completion/Data.hs

@@ -1,7 +1,4 @@
 {-# LANGUAGE OverloadedStrings #-}
-{-# OPTIONS_GHC -Wno-unrecognised-pragmas #-}
-
-{-# HLINT ignore "Redundant bracket" #-}
 
 module Ide.Plugin.Cabal.Completion.Data where
 
@@ -19,6 +16,17 @@ import           Ide.Plugin.Cabal.Completion.Completer.Types    (Completer)
 import           Ide.Plugin.Cabal.Completion.Types
 import           Ide.Plugin.Cabal.LicenseSuggest                (licenseNames)
 
+-- | Ad-hoc data type for modelling the available top-level stanzas.
+-- Not intended right now for anything else but to avoid string
+-- comparisons in 'stanzaKeywordMap' and 'libExecTestBenchCommons'.
+data TopLevelStanza
+  = Library
+  | Executable
+  | TestSuite
+  | Benchmark
+  | ForeignLib
+  | Common
+
 -- ----------------------------------------------------------------
 -- Completion Data
 -- ----------------------------------------------------------------
@@ -71,12 +79,13 @@ cabalKeywords =
 stanzaKeywordMap :: Map StanzaType (Map KeyWordName Completer)
 stanzaKeywordMap =
   Map.fromList
-    [ ("library", libraryFields <> libExecTestBenchCommons),
-      ("executable", executableFields <> libExecTestBenchCommons),
-      ("test-suite", testSuiteFields <> libExecTestBenchCommons),
-      ("benchmark", benchmarkFields <> libExecTestBenchCommons),
-      ("foreign-library", foreignLibraryFields <> libExecTestBenchCommons),
-      ("common", libExecTestBenchCommons),
+    [ ("library", libraryFields <> libExecTestBenchCommons Library),
+      ("executable", executableFields <> libExecTestBenchCommons Executable),
+      ("test-suite", testSuiteFields <> libExecTestBenchCommons TestSuite),
+      ("benchmark", benchmarkFields <> libExecTestBenchCommons Benchmark),
+      ("foreign-library", foreignLibraryFields <> libExecTestBenchCommons ForeignLib),
+      ("common", libExecTestBenchCommons Library),
+      ("common", libExecTestBenchCommons Common),
       ("flag", flagFields),
       ("source-repository", sourceRepositoryFields)
     ]
@@ -162,8 +171,8 @@ flagFields =
       ("lib-version-linux:", noopCompleter)
     ]
 
-libExecTestBenchCommons :: Map KeyWordName Completer
-libExecTestBenchCommons =
+libExecTestBenchCommons :: TopLevelStanza -> Map KeyWordName Completer
+libExecTestBenchCommons st =
   Map.fromList
     [ ("import:", importCompleter),
       ("build-depends:", noopCompleter),
@@ -183,6 +192,8 @@ libExecTestBenchCommons =
       ("includes:", filePathCompleter),
       ("install-includes:", filePathCompleter),
       ("include-dirs:", directoryCompleter),
+      ("autogen-includes:", filePathCompleter),
+      ("autogen-modules:", moduleCompleterByTopLevelStanza),
       ("c-sources:", filePathCompleter),
       ("cxx-sources:", filePathCompleter),
       ("asm-sources:", filePathCompleter),
@@ -203,6 +214,26 @@ libExecTestBenchCommons =
       ("extra-framework-dirs:", directoryCompleter),
       ("mixins:", noopCompleter)
     ]
+  where
+    --
+    moduleCompleterByTopLevelStanza = case st of
+      Library -> modulesCompleter sourceDirsExtractionLibrary
+      Executable -> modulesCompleter sourceDirsExtractionExecutable
+      TestSuite -> modulesCompleter sourceDirsExtractionTestSuite
+      Benchmark -> modulesCompleter sourceDirsExtractionBenchmark
+      ForeignLib -> modulesCompleter sourceDirsExtractionForeignLib
+      Common ->
+        -- TODO: We can't provide a module completer because we provide
+        -- module completions based on the "hs-source-dirs" after parsing the file,
+        -- i.e. based on the 'PackageDescription'.
+        -- "common" stanzas are erased in the 'PackageDescription' representation,
+        -- thus we can't provide accurate module completers right now, as we don't
+        -- know what the 'hs-source-dirs' in the "common" stanza are.
+        --
+        -- A potential fix would be to introduce an intermediate representation that
+        -- parses the '.cabal' file s.t. that we have access to the 'hs-source-dirs',
+        -- but not have erased the "common" stanza.
+        noopCompleter
 
 -- | Contains a map of the most commonly used licenses, weighted by their popularity.
 --

plugins/hls-cabal-plugin/test/Completer.hs

@@ -7,6 +7,7 @@ module Completer where
 
 import           Control.Lens                                   ((^.), (^?))
 import           Control.Lens.Prism
+import           Control.Monad                                  (forM_)
 import qualified Data.ByteString                                as ByteString
 import qualified Data.ByteString.Char8                          as BS8
 import           Data.Maybe                                     (mapMaybe)
@@ -40,7 +41,8 @@ completerTests =
       completionHelperTests,
       filePathExposedModulesTests,
       exposedModuleCompleterTests,
-      importCompleterTests
+      importCompleterTests,
+      autogenFieldCompletionTests
     ]
 
 basicCompleterTests :: TestTree
@@ -336,6 +338,26 @@ importCompleterTests =
           [Syntax.SecArgName (Syntax.Position row (col + 7)) (BS8.pack name)]
           []
 
+autogenFieldCompletionTests :: TestTree
+autogenFieldCompletionTests =
+  testGroup "Autogen Field Completer Tests"
+    [ testAutogenField "library"         "completion/autogen-completion.cabal" (Position 6 9)  ["autogen-modules:", "autogen-includes:"]
+    , testAutogenField "executable"      "completion/autogen-completion.cabal" (Position 11 9) ["autogen-modules:", "autogen-includes:"]
+    , testAutogenField "test-suite"      "completion/autogen-completion.cabal" (Position 16 9) ["autogen-modules:", "autogen-includes:"]
+    , testAutogenField "benchmark"       "completion/autogen-completion.cabal" (Position 21 9) ["autogen-modules:", "autogen-includes:"]
+    , testAutogenField "common"          "completion/autogen-completion.cabal" (Position 24 9) ["autogen-modules:", "autogen-includes:"]
+    ]
+
+  where
+    testAutogenField :: String -> FilePath -> Position -> [T.Text] -> TestTree
+    testAutogenField section file pos expected = runCabalTestCaseSession ("autogen-modules completion in " <> section) "" $ do
+      doc <- openDoc file "cabal"
+      items <- getCompletions doc pos
+      let labels = map (^. L.label) items
+      liftIO $ forM_ expected $ \expect ->
+        assertBool (T.unpack expect <> " not found in " <> section) $
+          any (expect `T.isInfixOf`) labels
+
 simpleCompleterData :: Maybe StanzaName -> FilePath -> T.Text -> CompleterData
 simpleCompleterData sName dir pref = do
   CompleterData

plugins/hls-cabal-plugin/test/testdata/completion/autogen-completion.cabal

@@ -0,0 +1,25 @@
+cabal-version: 3.0
+name: autogen-completion
+version: 0.1.0.0
+
+library
+  hs-source-dirs: src
+  autogen-
+
+executable autoexe
+  main-is: Main.hs
+  hs-source-dirs: src
+  autogen-
+
+test-suite autotest
+  type: exitcode-stdio-1.0
+  hs-source-dirs: src
+  autogen-
+
+benchmark autobench
+  type: exitcode-stdio-1.0
+  hs-source-dirs: src
+  autogen-
+
+common defaults
+  autogen-