feat: show plugin features from the manifest on the plugin page

src/backend/tests/plugins/manifest.test.ts

@@ -13,6 +13,7 @@ import {
   SUPPORTED_PLUGIN_API_VERSION,
   isTermixCompatible,
   youtubeVideoId,
+  pluginFeatures,
 } from "../../plugins/manifest.js";
 
 function base(overrides: Record<string, unknown> = {}) {
@@ -885,6 +886,37 @@ describe("manifest video", () => {
   });
 });
 
+describe("manifest features", () => {
+  it("accepts a short list of lines", () => {
+    expect(
+      validateManifest(base({ features: ["Start containers", "Read logs"] })),
+    ).toEqual([]);
+  });
+
+  it("rejects bad lists", () => {
+    expect(validateManifest(base({ features: "Logs" }))).toEqual([
+      'Field "features" must be an array of strings',
+    ]);
+    expect(validateManifest(base({ features: ["ok", "", 4] }))).toHaveLength(2);
+    expect(
+      validateManifest(base({ features: ["x".repeat(161)] })).join(),
+    ).toMatch(/features\[0\]/);
+    expect(
+      validateManifest(base({ features: Array(21).fill("x") })).join(),
+    ).toMatch(/at most 20/);
+  });
+});
+
+describe("pluginFeatures", () => {
+  it("keeps only usable lines", () => {
+    expect(pluginFeatures([" Logs ", "", 3, "x".repeat(161), "Stats"])).toEqual(
+      ["Logs", "Stats"],
+    );
+    expect(pluginFeatures(Array(30).fill("x"))).toHaveLength(20);
+    expect(pluginFeatures("Logs")).toEqual([]);
+  });
+});
+
 describe("youtubeVideoId", () => {
   it("returns only the id", () => {
     expect(

src/backend/tests/plugins/registry-index.test.ts

@@ -143,6 +143,17 @@ describe("parseRegistryIndex", () => {
     expect(index.plugins[1].versions[0].notes).toHaveLength(20_000);
   });
 
+  it("keeps only usable feature lines", () => {
+    const index = parseRegistryIndex({
+      plugins: [
+        { id: "docker", features: ["Logs", 5, ""], versions: [version()] },
+        { id: "other", features: "Logs", versions: [version()] },
+      ],
+    });
+    expect(index.plugins[0].features).toEqual(["Logs"]);
+    expect(index.plugins[1].features).toEqual([]);
+  });
+
   it("refuses something that is not an index", () => {
     expect(() => parseRegistryIndex({ nope: true })).toThrow(/no plugins/);
   });