hls-cabal-project-plugin: Add completions suggestions for cabal.project files.

Author: rm41339

.gitmodules

@@ -8,3 +8,7 @@
 #     Commit git commit -m "Removed submodule <name>"
 #     Delete the now untracked submodule files
 #     rm -rf path_to_submodule
+
+[submodule "vendor/cabal"]
+	path = vendor/cabal
+	url = https://github.com/rm41339/cabal.git

cabal.project

@@ -6,7 +6,16 @@ packages:
          ./ghcide
          ./hls-plugin-api
          ./hls-test-utils
+         ./vendor/cabal/Cabal
+         ./vendor/cabal/Cabal-syntax
+         ./vendor/cabal/cabal-install
+         ./vendor/cabal/cabal-install-solver
+         ./vendor/cabal/Cabal-described
+         ./vendor/cabal/Cabal-tree-diff
 
+package cabal-install
+  tests: False
+  benchmarks: False
 
 index-state: 2025-05-12T13:26:29Z
 

haskell-language-server.cabal

@@ -333,11 +333,15 @@ common cabalProject
 
 library hls-cabal-project-plugin
   import:           defaults, pedantic, warnings
-  if !flag(cabal)
+  if !flag(cabalProject)
     buildable: False
   exposed-modules:
     Ide.Plugin.CabalProject
-
+    Ide.Plugin.CabalProject.Parse
+    Ide.Plugin.CabalProject.Diagnostics
+    Ide.Plugin.CabalProject.Types
+    Ide.Plugin.CabalProject.Completion.Completions
+    Ide.Plugin.CabalProject.Completion.Data
 
   build-depends:
     , bytestring
@@ -347,10 +351,10 @@ library hls-cabal-project-plugin
     , directory
     , filepath
     , extra                 >=1.7.4
-    , ghcide                == 2.9.0.1
+    , ghcide                == 2.11.0.0
     , hashable
-    , hls-plugin-api        == 2.9.0.1
-    , hls-graph             == 2.9.0.1
+    , hls-plugin-api        == 2.11.0.0
+    , hls-graph             == 2.11.0.0
     , lens
     , lsp                   ^>=2.7
     , lsp-types             ^>=2.3
@@ -364,6 +368,11 @@ library hls-cabal-project-plugin
     , aeson
     , Cabal
     , pretty
+    , cabal-install
+    , cabal-install-solver
+    , haskell-language-server:hls-cabal-plugin
+    , base16-bytestring
+    , cryptohash-sha1
 
   hs-source-dirs:   plugins/hls-cabal-project-plugin/src
 
@@ -375,18 +384,22 @@ test-suite hls-cabal-project-plugin-tests
   hs-source-dirs:   plugins/hls-cabal-project-plugin/test
   main-is:          Main.hs
   other-modules:
+    Completer
+    Utils
   build-depends:
     , bytestring
     , Cabal-syntax          >= 3.7
     , extra
     , filepath
     , ghcide
     , haskell-language-server:hls-cabal-project-plugin
-    , hls-test-utils    == 2.9.0.1
+    , hls-test-utils    == 2.11.0.0
     , lens
     , lsp-types
     , text
     , hls-plugin-api
+    , cabal-install
+    , haskell-language-server:hls-cabal-plugin
 
 -----------------------------
 -- class plugin

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

@@ -5,6 +5,8 @@ module Ide.Plugin.Cabal.Diagnostics
 , warningDiagnostic
 , positionFromCabalPosition
 , fatalParseErrorDiagnostic
+, toBeginningOfNextLine
+, mkDiag
   -- * Re-exports
 , FileDiagnostic
 , Diagnostic(..)

plugins/hls-cabal-plugin/test/testdata/completer.cabal

@@ -11,4 +11,4 @@ be
 library
     lib
 
-co
+co