Add preliminary support for cabal.project files

Author: fendor

package.json

@@ -35,7 +35,8 @@
   "activationEvents": [
     "onLanguage:haskell",
     "onLanguage:literate haskell",
-    "onLanguage:cabal"
+    "onLanguage:cabal",
+    "onLanguage:cabal project"
   ],
   "main": "./dist/extension",
   "contributes": {
@@ -59,6 +60,16 @@
           ".cabal"
         ]
       },
+      {
+        "id": "cabal project",
+        "aliases": [
+          "cabalProject"
+        ],
+        "extensions": [
+          ".project",
+          ".project.local"
+        ]
+      },
       {
         "id": "literate haskell",
         "aliases": [

src/extension.ts

@@ -293,6 +293,9 @@ async function activateServerForFolder(context: ExtensionContext, uri: Uri, fold
       break;
   }
 
+  // TODO @fendor: guard the cabal.project support by HLS version
+  documentSelector.push({ scheme: 'file', language: 'cabal project', pattern: pat });
+
   const clientOptions: LanguageClientOptions = {
     // Use the document selector to only notify the LSP on files inside the folder
     // path for the specific workspace.