Show action input descriptions on hover

actions-languageserver/src/description-provider.ts

@@ -0,0 +1,26 @@
+import {DescriptionProvider} from "@github/actions-languageservice/hover";
+import {Octokit} from "@octokit/rest";
+import {TTLCache} from "./utils/cache";
+import {getActionInputDescription} from "./description-providers/action-input";
+
+export function descriptionProvider(sessionToken: string | undefined, cache: TTLCache): DescriptionProvider {
+  const octokit =
+    sessionToken &&
+    new Octokit({
+      auth: sessionToken
+    });
+
+  const getDescription: DescriptionProvider["getDescription"] = async (context, token, path) => {
+    if (!octokit) {
+      return undefined;
+    }
+    const parent = path[path.length - 1];
+    if (context.step && parent.definition?.key === "step-with") {
+      return await getActionInputDescription(octokit, cache, context.step, token);
+    }
+  };
+
+  return {
+    getDescription
+  };
+}