feat(gradle): link and unlink independent Gradle builds (#1413)

Opening a folder of independent Gradle builds selected only the first build. Link Gradle Projects… (pick a build's settings or build file) and Unlink on a build's root let an ordinary project window manage several independent builds without changing their scripts. The build model holds a list of Gradle builds; each keeps its own wrapper, working directory, environment, task routing and sync cache, keyed by the owning build directory. The links persist in the project's Gradle settings (linkedProjects); unlinking leaves files and saved run configurations alone. Existing includeBuild support is unchanged, and an explicitly linked build takes precedence over a composite that also includes it. Workspace windows keep Link/Unlink disabled.

Co-authored-by: gudcks0305 <[email protected]>

e2e/linkedGradle.spec.ts

@@ -0,0 +1,120 @@
+/** Linked Gradle builds use isolated native stubs; no real builds or files are touched. */
+import type { GradleModel, RunConfig } from "../src/platform/ipc";
+import { expect, ipcCalls, stubDesktop, test } from "./fixtures";
+
+const build = (dir: string): GradleModel => ({
+  dir,
+  command: `/dev/acme-api/${dir}/gradlew`,
+  env: { JAVA_HOME: `/${dir}/jdk` },
+  javaVersion: 21,
+  syncedAt: 1,
+  stale: false,
+  syncError: null,
+  projects: [
+    { path: ":", name: dir, dir, buildFile: `${dir}/build.gradle`, tasks: [] },
+    {
+      path: ":app",
+      name: "app",
+      dir: `${dir}/app`,
+      buildFile: `${dir}/app/build.gradle`,
+      tasks: [{ name: "assemble", group: "build", description: "Assembles this project" }],
+    },
+  ],
+});
+
+test("links independent Gradle roots, runs identical task paths in their own builds and unlinks without deletion", async ({
+  workbench: page,
+}, info) => {
+  await stubDesktop(page);
+  await page.evaluate(
+    async ({ first, second }) => {
+      let linked = [first];
+      let runId = 0;
+      const model = () => ({ maven: null, gradle: linked });
+      const h = window.__ipc.handlers;
+      h.build_model = model;
+      h.build_sync = model;
+      h.run_configs = () => [];
+      h.run_apply_settings = (args) => args.configs;
+      h.gradle_link_projects = () => {
+        if (!linked.some((g) => g.dir === second.dir)) linked = [...linked, second];
+        return model();
+      };
+      h.gradle_unlink_projects = (args) => {
+        linked = linked.filter((g) => !(args.paths as string[]).includes(g.dir));
+        return model();
+      };
+      h["plugin:dialog|open"] = () => ["/dev/acme-api/second/settings.gradle"];
+      h.run_start = (args) => {
+        const config = args.config as RunConfig;
+        const id = ++runId;
+        setTimeout(() => window.__ipc.emit({ type: "runExited", run: id, code: 0 }), 50);
+        return { id, configId: config.id, name: config.name, pid: 4242 + id, running: true, pty: false };
+      };
+      const storeModule = "/src/features/build-tools/store.ts";
+      const { loadModel } = await import(/* @vite-ignore */ storeModule);
+      await loadModel();
+      const contributionsModule = "/src/workbench/contributions.ts";
+      const { toolWindowService } = await import(/* @vite-ignore */ contributionsModule);
+      toolWindowService().show("gradle", true);
+    },
+    { first: build("first"), second: build("second") },
+  );
+
+  const tree = page.getByRole("tree", { name: "Gradle projects" });
+  await expect(tree.getByRole("treeitem", { name: "first", exact: true })).toBeVisible();
+  await expect(tree.getByRole("treeitem", { name: "second", exact: true })).toHaveCount(0);
+  await page.screenshot({ path: info.outputPath("gradle-one-root.png"), animations: "disabled" });
+
+  await page.getByRole("button", { name: "Link Gradle Projects", exact: true }).click();
+  await expect
+    .poll(() => ipcCalls(page, "gradle_link_projects"))
+    .toEqual([{ paths: ["/dev/acme-api/second/settings.gradle"] }]);
+  await expect(tree.getByRole("treeitem", { name: "second", exact: true })).toBeVisible();
+  // Reloading the model reads the persisted linkage again.
+  await page.evaluate(async () => {
+    const storeModule = "/src/features/build-tools/store.ts";
+    const { loadModel } = await import(/* @vite-ignore */ storeModule);
+    await loadModel();
+    const actionModule = "/src/platform/actions.ts";
+    const { executeAction } = await import(/* @vite-ignore */ actionModule);
+    await executeAction("gradle.expandAll");
+    await executeAction("gradle.toggleOffline");
+  });
+  const tasks = tree.getByRole("treeitem", { name: /^assemble\b/ });
+  await expect(tasks).toHaveCount(2);
+  await page.screenshot({ path: info.outputPath("gradle-two-roots.png"), animations: "disabled" });
+
+  await tasks.nth(0).dblclick();
+  await expect.poll(async () => (await ipcCalls(page, "run_start")).length).toBe(1);
+  await tasks.nth(1).dblclick();
+  await expect.poll(async () => (await ipcCalls(page, "run_start")).length).toBe(2);
+  const runs = (await ipcCalls(page, "run_start")).map((args) => args.config as RunConfig);
+  expect(runs[0]!.id).not.toBe(runs[1]!.id);
+  for (const [index, dir] of ["first", "second"].entries()) {
+    expect(runs[index]).toMatchObject({
+      command: `/dev/acme-api/${dir}/gradlew`,
+      cwd: dir,
+      args: [":app:assemble", "--offline"],
+      env: { JAVA_HOME: `/${dir}/jdk` },
+    });
+  }
+
+  for (const dir of ["second", "first"]) {
+    await tree.getByRole("treeitem", { name: dir, exact: true }).click({ button: "right" });
+    await page.getByRole("menuitem", { name: "Unlink Gradle Project", exact: true }).click();
+    const dialog = page.getByRole("dialog", { name: "Unlink Gradle project?" });
+    await expect(dialog).toContainText("Files will remain");
+    await dialog.getByRole("button", { name: "Unlink", exact: true }).click();
+    await expect(tree.getByRole("treeitem", { name: dir, exact: true })).toHaveCount(0);
+  }
+  await expect
+    .poll(() => ipcCalls(page, "gradle_unlink_projects"))
+    .toEqual([{ paths: ["second"] }, { paths: ["first"] }]);
+  await expect(page.getByText("No Gradle projects", { exact: true })).toBeVisible();
+  await expect(page.getByRole("button", { name: "Link Gradle Projects", exact: true })).toBeVisible();
+  expect(
+    await page.evaluate(() => window.__ipc.calls.filter((c) => /^fs_(?:delete|remove|trash)/.test(c.cmd))),
+  ).toEqual([]);
+  await page.screenshot({ path: info.outputPath("gradle-unlinked.png"), animations: "disabled" });
+});