Change Type Signature Plugin

cabal-ghc90.project

@@ -27,6 +27,7 @@ packages:
          ./plugins/hls-call-hierarchy-plugin
          ./plugins/hls-alternate-number-format-plugin
          ./plugins/hls-selection-range-plugin
+         ./plugins/hls-change-type-signature-plugin
 
 tests: true
 

cabal-ghc921.project

@@ -27,6 +27,7 @@ packages:
          ./plugins/hls-call-hierarchy-plugin
          ./plugins/hls-alternate-number-format-plugin
          ./plugins/hls-selection-range-plugin
+         ./plugins/hls-change-type-signature-plugin
 
 with-compiler: ghc-9.2.1
 

cabal.project

@@ -27,6 +27,7 @@ packages:
          ./plugins/hls-alternate-number-format-plugin
          ./plugins/hls-qualify-imported-names-plugin
          ./plugins/hls-selection-range-plugin
+         ./plugins/hls-change-type-signature-plugin
 
 -- Standard location for temporary packages needed for particular environments
 -- For example it is used in the project gitlab mirror to help in the MAcOS M1 build script

docs/features.md

@@ -18,7 +18,7 @@ Many of these are standard LSP features, but a lot of special features are provi
 | [Highlight references](#highlight-references)       | `textDocument/documentHighlight`                                                                  |
 | [Code actions](#code-actions)                       | `textDocument/codeAction`                                                                         |
 | [Code lenses](#code-lenses)                         | `textDocument/codeLens`                                                                           |
-| [Selection range](#selection-range)                 | `textDocument/selectionRange` |
+| [Selection range](#selection-range)                 | `textDocument/selectionRange`                                                                     |
 
 The individual sections below also identify which [HLS plugin](./what-is-hls.md#hls-plugins) is responsible for providing the given functionality, which is useful if you want to raise an issue report or contribute!
 Additionally, not all plugins are supported on all versions of GHC, see the [GHC version support page](supported-versions.md) for details.
@@ -237,6 +237,26 @@ Provides a variety of code actions for interactive code development, see <https:
 
 ![Wingman Demo](https://user-images.githubusercontent.com/307223/92657198-3d4be400-f2a9-11ea-8ad3-f541c8eea891.gif)
 
+### Change Type Signature
+
+Provided by: `hls-change-type-signature-plugin`
+
+Code action kind: `quickfix`
+
+Change/Update a type signature to match implementation.
+
+Status: Until GHC 9.4, the implementation is ad-hoc and relies on GHC error messages to create a new signature. Not all GHC error messages are supported.
+
+Known Limitations:
+- Not all GHC error messages are supported
+- Top-level and Function-local bindings with the same names can cause issues, such as incorrect signature changes or no code actions available.
+
+![Change Type Signature Demo](../plugins/hls-change-type-signature-plugin/change1.gif)
+
+![Change Type Signature Demo](../plugins/hls-change-type-signature-plugin/change2.gif)
+
+[Link to Docs](../plugins/hls-change-type-signature/README.md)
+
 ## Code lenses
 
 ### Add type signature

exe/Plugins.hs

@@ -79,6 +79,9 @@ import qualified Ide.Plugin.AlternateNumberFormat  as AlternateNumberFormat
 import           Ide.Plugin.SelectionRange         as SelectionRange
 #endif
 
+#if changeTypeSignature
+import           Ide.Plugin.ChangeTypeSignature    as ChangeTypeSignature
+#endif
 -- formatters
 
 #if floskell
@@ -184,6 +187,9 @@ idePlugins recorder includeExamples = pluginDescToIdePlugins allPlugins
 #endif
 #if selectionRange
       SelectionRange.descriptor "selectionRange" :
+#endif
+#if changeTypeSignature
+      ChangeTypeSignature.descriptor "changeTypeSignature" :
 #endif
     -- The ghcide descriptors should come last so that the notification handlers
     -- (which restart the Shake build) run after everything else

haskell-language-server.cabal

@@ -182,6 +182,11 @@ flag selectionRange
   default:     True
   manual:      True
 
+flag changeTypeSignature
+  description: Enable changeTypeSignature plugin
+  default:     True
+  manual:      True
+
 -- formatters
 
 flag floskell
@@ -299,6 +304,11 @@ common selectionRange
     build-depends: hls-selection-range-plugin ^>=1.0.0.0
     cpp-options: -DselectionRange
 
+common changeTypeSignature
+  if flag(changeTypeSignature)
+    build-depends: hls-change-type-signature-plugin ^>=1.0.0.0
+    cpp-options: -DchangeTypeSignature
+
 -- formatters
 
 common floskell
@@ -334,6 +344,7 @@ executable haskell-language-server
                     -- plugins
                     , example-plugins
                     , callHierarchy
+                    , changeTypeSignature
                     , class
                     , haddockComments
                     , eval

hls-plugin-api/src/Ide/PluginUtils.hs

@@ -27,13 +27,15 @@ module Ide.PluginUtils
     subRange,
     positionInRange,
     usePropertyLsp,
+    getNormalizedFilePath,
     response,
     handleMaybe,
     handleMaybeM,
     )
 where
 
 
+import           Control.Lens                    ((^.))
 import           Control.Monad.Extra             (maybeM)
 import           Control.Monad.Trans.Class       (lift)
 import           Control.Monad.Trans.Except      (ExceptT, runExceptT, throwE)
@@ -54,6 +56,7 @@ import           Language.LSP.Types              hiding
                                                   SemanticTokensEdit (_start))
 import qualified Language.LSP.Types              as J
 import           Language.LSP.Types.Capabilities
+import           Language.LSP.Types.Lens         (uri)
 
 -- ---------------------------------------------------------------------
 
@@ -243,6 +246,15 @@ allLspCmdIds pid commands = concatMap go commands
 
 -- ---------------------------------------------------------------------
 
+getNormalizedFilePath :: Monad m => PluginId -> TextDocumentIdentifier -> ExceptT String m NormalizedFilePath
+getNormalizedFilePath (PluginId plId) docId = handleMaybe errMsg
+        $ uriToNormalizedFilePath
+        $ toNormalizedUri uri'
+    where
+        errMsg = T.unpack $ "Error(" <> plId <> "): converting " <> getUri uri' <> " to NormalizedFilePath"
+        uri' = docId ^. uri
+
+-- ---------------------------------------------------------------------
 handleMaybe :: Monad m => e -> Maybe b -> ExceptT e m b
 handleMaybe msg = maybe (throwE msg) return
 

plugins/hls-change-type-signature-plugin/LICENSE

@@ -0,0 +1,201 @@
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plugins/hls-change-type-signature-plugin/README.md

@@ -0,0 +1,16 @@
+# Change Type Signature Plugin
+
+The change type signature plugin provides a code action to change a user's current type signature to it's actual type signature.
+The plugin does not work in all error scenarios. Currently, the plugin uses GHC diagnostic messages to recover the actual type of a function.
+If the plugin receives enough information it can correctly change the signature.
+
+## Demo
+
+![Change Type Signature One](change1.gif)
+
+![Change Type Signature Two](change2.gif)
+
+
+## Changelog
+### 1.0.0.0
+- First Release