Improve parsing of import suggestions extending multiple multiline imports (fixes #4175) (#4177)

Author: jhrcek

plugins/hls-refactor-plugin/src/Development/IDE/Plugin/CodeAction.hs

@@ -1973,15 +1973,18 @@ regexSingleMatch msg regex = case matchRegexUnifySpaces msg regex of
     _          -> Nothing
 
 -- | Process a list of (module_name, filename:src_span) values
--- | Eg. [(Data.Map, app/ModuleB.hs:2:1-18), (Data.HashMap.Strict, app/ModuleB.hs:3:1-29)]
+--
+-- Eg. [(Data.Map, app/ModuleB.hs:2:1-18), (Data.HashMap.Strict, app/ModuleB.hs:3:1-29)]
 regExImports :: T.Text -> Maybe [(T.Text, T.Text)]
 regExImports msg
     | Just mods' <- allMatchRegex msg "‘([^’]*)’"
     , Just srcspans' <- allMatchRegex msg
+    -- This regex has to be able to deal both with single-line srcpans like "(/path/to/File.hs:2:1-18)"
+    -- as well as multi-line srcspans like "(/path/to/File.hs:(3,1)-(5,2))"
 #if MIN_VERSION_ghc(9,7,0)
-                          "\\(at ([^)]*)\\)"
+                          "\\(at ([^:]+:[^ ]+)\\)"
 #else
-                          "\\(([^)]*)\\)"
+                          "\\(([^:]+:[^ ]+)\\)"
 #endif
     , mods <- [mod | [_,mod] <- mods']
     , srcspans <- [srcspan | [_,srcspan] <- srcspans']

plugins/hls-refactor-plugin/test/Main.hs

@@ -1501,6 +1501,30 @@ extendImportTests = testGroup "extend import actions"
                     , "f :: Foo"
                     , "f = undefined"
                     ])
+        , testSession "data constructor with two multiline import lists that can be extended with it" $ template
+            []
+            ("A.hs", T.unlines
+                [ "module A where"
+                , "import Prelude ("
+                , " )"
+                , "import Data.Maybe ("
+                , " )"
+                , "f = Nothing"
+                ])
+            (Range (Position 5 5) (Position 5 6))
+            [ "Add Maybe(..) to the import list of Data.Maybe"
+            , "Add Maybe(..) to the import list of Prelude"
+            , "Add Maybe(Nothing) to the import list of Data.Maybe"
+            , "Add Maybe(Nothing) to the import list of Prelude"
+            ]
+            (T.unlines
+                ["module A where"
+                , "import Prelude ("
+                , " )"
+                , "import Data.Maybe (Maybe (..)"
+                , " )"
+                , "f = Nothing"
+                ])
         ]
       where
         codeActionTitle CodeAction{_title=x} = x