Setup CodeActions and add quickfix for missing inputs (#254)

* Setup CodeActions and add quickfix for missing inputs

* PR feedback

* Update languageservice/src/code-actions/quickfix/add-missing-inputs.ts

Co-authored-by: Salman Chishti <[email protected]>

* Fix indentSize detection for code actions after rebase

- Add indentSize to MissingInputsDiagnosticData interface
- Pass indentSize parameter from validate.ts to validateActionReference
- Detect indentSize from workflow structure (jobs key to first child)
- Fall back to detecting from with: block children when available

* update typescript

* formatting

* linting

* Gate missing inputs quickfix behind feature flag

* Address PR review: rename files, move position calculation to quickfix

- Rename index.ts files to follow repo patterns:
  - code-actions/index.ts → code-actions/code-actions.ts
  - code-actions/quickfix/index.ts → quickfix/quickfix-providers.ts
- Move position calculation from validation to quickfix:
  - MissingInputsDiagnosticData now passes raw token ranges
  - Quickfix computes insertion position and indentation at code action time
  - detectIndentSize moved from validate.ts to validate-action-reference.ts

* wip

* Remove pointless comment

---------

Co-authored-by: Salman Chishti <[email protected]>

languageserver/src/connection.ts

@@ -1,8 +1,18 @@
-import {documentLinks, getInlayHints, hover, validate, ValidationConfig} from "@actions/languageservice";
+import {
+  documentLinks,
+  getCodeActions,
+  getInlayHints,
+  hover,
+  validate,
+  ValidationConfig
+} from "@actions/languageservice";
 import {registerLogger, setLogLevel} from "@actions/languageservice/log";
 import {clearCache, clearCacheEntry} from "@actions/languageservice/utils/workflow-cache";
 import {Octokit} from "@octokit/rest";
 import {
+  CodeAction,
+  CodeActionKind,
+  CodeActionParams,
   CompletionItem,
   Connection,
   DocumentLink,
@@ -79,7 +89,10 @@ export function initConnection(connection: Connection) {
         documentLinkProvider: {
           resolveProvider: false
         },
-        inlayHintProvider: true
+        inlayHintProvider: true,
+        codeActionProvider: {
+          codeActionKinds: [CodeActionKind.QuickFix]
+        }
       }
     };
 
@@ -177,6 +190,17 @@ export function initConnection(connection: Connection) {
     });
   });
 
+  connection.onCodeAction((params: CodeActionParams): CodeAction[] => {
+    const document = getDocument(documents, params.textDocument);
+    return getCodeActions({
+      uri: params.textDocument.uri,
+      documentContent: document.getText(),
+      diagnostics: params.context.diagnostics,
+      only: params.context.only,
+      featureFlags
+    });
+  });
+
   // Make the text document manager listen on the connection
   // for open, change and close text document events
   documents.listen(connection);