Add configuration to enable/disable HIE

Author: Tehnix

README.md

@@ -64,6 +64,14 @@ There are a few placeholders which will be expanded:
 
 This can be beneficial if you are using something like nix, to have a wrapper script tailored to your setup.
 
+#### Enable/disable HIE
+
+You can enable or disable HIE via configuration. This is useful, because multi-root workspaces do not yet allow you to manage extensions at the folder level, which can be necessary.
+
+```json
+"languageServerHaskell.enableHIE": true
+```
+
 ## Manual Installation
 Either install the extension via the marketplace (preferred), or if you are testing an unreleased version by,
 
@@ -103,7 +111,14 @@ You can then define how to start HIE for each of these folders, by going into `S
 }
 ```
 
-to launch HIE via `hie.sh` inside the backend folder, while the frontend, because of being GHCJS, might not use HIE and use something else instead. This provides a very flexible way of customizing your setup.
+to launch HIE via `hie.sh` inside the _backend_ and _common_ folder, while the _frontend_, because of using GHCJS, might not want to use HIE, and therefore needs to disable HIE,
+
+```json
+{
+    "languageServerHaskell.useHieWrapper": false
+}
+```
+ This provides a very flexible way of customizing your setup.
 
 ## Release Notes
 

package.json

@@ -121,6 +121,12 @@
                     ],
                     "default": "off",
                     "description": "Traces the communication between VSCode and the languageServerHaskell service."
+                },
+                "languageServerHaskell.enableHIE": {
+                    "scope": "resource",
+                    "type": "boolean",
+                    "default": true,
+                    "description": "Enable/Disable HIE (useful for multi-root workspaces)."
                 }
             }
         },

src/extension.ts

@@ -89,6 +89,12 @@ async function activateHie(context: ExtensionContext, document: TextDocument) {
 }
 
 function activateHieNoCheck(context: ExtensionContext, folder: WorkspaceFolder, uri: Uri) {
+  // Stop right here, if HIE is disabled in the resource/workspace folder.
+  const enableHIE = workspace.getConfiguration('languageServerHaskell', uri).enableHIE;
+  if (!enableHIE) {
+    return;
+  }
+
   // Set up the documentation browser.
   if (!docsBrowserRegistered) {
     const docsDisposable = DocsBrowser.registerDocsBrowser();