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

exe/Plugins.hs

@@ -76,6 +76,9 @@ import           Ide.Plugin.AlternateNumberFormat  as AlternateNumberFormat
 import           Ide.Plugin.SelectionRange         as SelectionRange
 #endif
 
+#if changeTypeSignature
+import           Ide.Plugin.ChangeTypeSignature    as ChangeTypeSignature
+#endif
 -- formatters
 
 #if floskell
@@ -174,6 +177,9 @@ idePlugins 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

@@ -181,6 +181,11 @@ flag selectionRange
   default:     True
   manual:      True
 
+flag changeTypeSignature
+  description: Enable changeTypeSignature plugin
+  default:     True
+  manual:      True
+
 -- formatters
 
 flag floskell
@@ -298,6 +303,11 @@ 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
@@ -333,6 +343,7 @@ 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 +246,14 @@ allLspCmdIds pid commands = concatMap go commands
 
 -- ---------------------------------------------------------------------
 
+getNormalizedFilePath :: Monad m => PluginId -> TextDocumentIdentifier -> ExceptT String m NormalizedFilePath
+getNormalizedFilePath (PluginId plId) docId = handleMaybe errMsg
+        $ uriToNormalizedFilePath
+        $ toNormalizedUri (docId ^. uri)
+    where
+        errMsg = T.unpack $ "Error(" <> plId <> "): converting to NormalizedFilePath"
+
+-- ---------------------------------------------------------------------
 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 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

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

plugins/hls-change-type-signature-plugin/hls-change-type-signature-plugin.cabal

@@ -0,0 +1,64 @@
+cabal-version:      2.4
+name:               hls-change-type-signature-plugin
+version:            1.0.0.0
+synopsis:           Change a declarations type signature with a Code Action
+description:
+  Please see the README on GitHub at <https://github.com/haskell/plugins/hls-change-type-signature-plugin/README.md>
+
+license:            Apache-2.0
+license-file:       LICENSE
+author:             Nick Suchecki
+maintainer:         nicksuchecki@gmail.com
+category:           Development
+build-type:         Simple
+extra-source-files:
+  LICENSE
+  README.md
+  test/testdata/*.hs
+  test/testdata/*.yaml
+
+library
+  exposed-modules:  Ide.Plugin.ChangeTypeSignature
+  hs-source-dirs:   src
+  build-depends:
+    , base                 >=4.12 && < 5
+    , ghcide          ^>=1.6
+    , hls-plugin-api  ^>=1.3
+    , lsp-types       
+    , transformers
+    , regex-tdfa     
+    , text
+    , unordered-containers
+
+  default-language: Haskell2010
+  default-extensions:
+    ConstraintKinds
+    DataKinds
+    ExplicitNamespaces
+    FlexibleContexts
+    NamedFieldPuns
+    OverloadedStrings
+    RecordWildCards
+    TypeOperators
+
+
+test-suite tests
+  type:             exitcode-stdio-1.0
+  default-language: Haskell2010
+  hs-source-dirs:   test
+  main-is:          Main.hs
+  ghc-options:      -threaded -rtsopts -with-rtsopts=-N -fno-ignore-asserts
+  build-depends:
+    , base                 >=4.12 && < 5
+    , filepath
+    , hls-change-type-signature-plugin
+    , hls-test-utils       ^>=1.2
+    , lsp
+    , QuickCheck
+    , regex-tdfa
+    , text
+  default-extensions:
+    NamedFieldPuns
+    OverloadedStrings
+    TypeOperators
+    ViewPatterns