feat: gstack-global-discover — cross-tool AI session discovery

Standalone script that scans Claude Code, Codex CLI, and Gemini CLI
session directories, resolves each session's working directory to a git
repo, deduplicates by normalized remote URL, and outputs structured JSON.

- Reads only first 4-8KB of session files (avoids OOM on large transcripts)
- Only counts JSONL files modified within the time window (accurate counts)
- Week windows midnight-aligned like day windows for consistency
- 16 tests covering URL normalization, CLI behavior, and output structure

test/global-discover.test.ts

@@ -0,0 +1,187 @@
+import { describe, test, expect, beforeEach, afterEach } from "bun:test";
+import { mkdtempSync, mkdirSync, writeFileSync, rmSync, existsSync } from "fs";
+import { join } from "path";
+import { tmpdir } from "os";
+import { spawnSync } from "child_process";
+
+// Import normalizeRemoteUrl for unit testing
+// We test the script end-to-end via CLI and normalizeRemoteUrl via import
+const scriptPath = join(import.meta.dir, "..", "bin", "gstack-global-discover.ts");
+
+describe("gstack-global-discover", () => {
+  describe("normalizeRemoteUrl", () => {
+    // Dynamically import to test the exported function
+    let normalizeRemoteUrl: (url: string) => string;
+
+    beforeEach(async () => {
+      const mod = await import("../bin/gstack-global-discover.ts");
+      normalizeRemoteUrl = mod.normalizeRemoteUrl;
+    });
+
+    test("strips .git suffix", () => {
+      expect(normalizeRemoteUrl("https://github.com/user/repo.git")).toBe(
+        "https://github.com/user/repo"
+      );
+    });
+
+    test("converts SSH to HTTPS", () => {
+      expect(normalizeRemoteUrl("git@github.com:user/repo.git")).toBe(
+        "https://github.com/user/repo"
+      );
+    });
+
+    test("converts SSH without .git to HTTPS", () => {
+      expect(normalizeRemoteUrl("git@github.com:user/repo")).toBe(
+        "https://github.com/user/repo"
+      );
+    });
+
+    test("lowercases host", () => {
+      expect(normalizeRemoteUrl("https://GitHub.COM/user/repo")).toBe(
+        "https://github.com/user/repo"
+      );
+    });
+
+    test("SSH and HTTPS for same repo normalize to same URL", () => {
+      const ssh = normalizeRemoteUrl("git@github.com:garrytan/gstack.git");
+      const https = normalizeRemoteUrl("https://github.com/garrytan/gstack.git");
+      const httpsNoDotGit = normalizeRemoteUrl("https://github.com/garrytan/gstack");
+      expect(ssh).toBe(https);
+      expect(https).toBe(httpsNoDotGit);
+    });
+
+    test("handles local: URLs consistently", () => {
+      const result = normalizeRemoteUrl("local:/tmp/my-repo");
+      // local: gets parsed as a URL scheme — the important thing is consistency
+      expect(result).toContain("/tmp/my-repo");
+    });
+
+    test("handles GitLab SSH URLs", () => {
+      expect(normalizeRemoteUrl("git@gitlab.com:org/project.git")).toBe(
+        "https://gitlab.com/org/project"
+      );
+    });
+  });
+
+  describe("CLI", () => {
+    test("--help exits 0 and prints usage", () => {
+      const result = spawnSync("bun", ["run", scriptPath, "--help"], {
+        encoding: "utf-8",
+        timeout: 10000,
+      });
+      expect(result.status).toBe(0);
+      expect(result.stderr).toContain("--since");
+    });
+
+    test("no args exits 1 with error", () => {
+      const result = spawnSync("bun", ["run", scriptPath], {
+        encoding: "utf-8",
+        timeout: 10000,
+      });
+      expect(result.status).toBe(1);
+      expect(result.stderr).toContain("--since is required");
+    });
+
+    test("invalid window format exits 1", () => {
+      const result = spawnSync("bun", ["run", scriptPath, "--since", "abc"], {
+        encoding: "utf-8",
+        timeout: 10000,
+      });
+      expect(result.status).toBe(1);
+      expect(result.stderr).toContain("Invalid window format");
+    });
+
+    test("--since 7d produces valid JSON", () => {
+      const result = spawnSync(
+        "bun",
+        ["run", scriptPath, "--since", "7d", "--format", "json"],
+        { encoding: "utf-8", timeout: 30000 }
+      );
+      expect(result.status).toBe(0);
+      const json = JSON.parse(result.stdout);
+      expect(json).toHaveProperty("window", "7d");
+      expect(json).toHaveProperty("repos");
+      expect(json).toHaveProperty("total_sessions");
+      expect(json).toHaveProperty("total_repos");
+      expect(json).toHaveProperty("tools");
+      expect(Array.isArray(json.repos)).toBe(true);
+    });
+
+    test("--since 7d --format summary produces readable output", () => {
+      const result = spawnSync(
+        "bun",
+        ["run", scriptPath, "--since", "7d", "--format", "summary"],
+        { encoding: "utf-8", timeout: 30000 }
+      );
+      expect(result.status).toBe(0);
+      expect(result.stdout).toContain("Window: 7d");
+      expect(result.stdout).toContain("Sessions:");
+      expect(result.stdout).toContain("Repos:");
+    });
+
+    test("--since 1h returns results (may be empty)", () => {
+      const result = spawnSync(
+        "bun",
+        ["run", scriptPath, "--since", "1h", "--format", "json"],
+        { encoding: "utf-8", timeout: 30000 }
+      );
+      expect(result.status).toBe(0);
+      const json = JSON.parse(result.stdout);
+      expect(json.total_sessions).toBeGreaterThanOrEqual(0);
+    });
+  });
+
+  describe("discovery output structure", () => {
+    test("repos have required fields", () => {
+      const result = spawnSync(
+        "bun",
+        ["run", scriptPath, "--since", "30d", "--format", "json"],
+        { encoding: "utf-8", timeout: 30000 }
+      );
+      expect(result.status).toBe(0);
+      const json = JSON.parse(result.stdout);
+
+      for (const repo of json.repos) {
+        expect(repo).toHaveProperty("name");
+        expect(repo).toHaveProperty("remote");
+        expect(repo).toHaveProperty("paths");
+        expect(repo).toHaveProperty("sessions");
+        expect(Array.isArray(repo.paths)).toBe(true);
+        expect(repo.paths.length).toBeGreaterThan(0);
+        expect(repo.sessions).toHaveProperty("claude_code");
+        expect(repo.sessions).toHaveProperty("codex");
+        expect(repo.sessions).toHaveProperty("gemini");
+      }
+    });
+
+    test("tools summary matches repo data", () => {
+      const result = spawnSync(
+        "bun",
+        ["run", scriptPath, "--since", "30d", "--format", "json"],
+        { encoding: "utf-8", timeout: 30000 }
+      );
+      const json = JSON.parse(result.stdout);
+
+      // Total sessions should equal sum across tools
+      const toolTotal =
+        json.tools.claude_code.total_sessions +
+        json.tools.codex.total_sessions +
+        json.tools.gemini.total_sessions;
+      expect(json.total_sessions).toBe(toolTotal);
+    });
+
+    test("deduplicates Conductor workspaces by remote", () => {
+      const result = spawnSync(
+        "bun",
+        ["run", scriptPath, "--since", "30d", "--format", "json"],
+        { encoding: "utf-8", timeout: 30000 }
+      );
+      const json = JSON.parse(result.stdout);
+
+      // Check that no two repos share the same normalized remote
+      const remotes = json.repos.map((r: any) => r.remote);
+      const uniqueRemotes = new Set(remotes);
+      expect(remotes.length).toBe(uniqueRemotes.size);
+    });
+  });
+});