From 3c77c439990cdf12c966fe88b15a544d08541c14 Mon Sep 17 00:00:00 2001
From: Chris Wanstrath <chris@ozmm.org>
Date: Thu, 19 Feb 2026 09:46:09 -0800
Subject: [PATCH] Add `diff` command to show unstaged changes in a session's
 worktree

---
 src/cli.ts | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/src/cli.ts b/src/cli.ts
index 6946c54..60e53ad 100755
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -225,6 +225,27 @@ program
     spin.succeed(`Saved: ${msg}`)
   })
 
+// ── sandlot diff <branch> ───────────────────────────────────────────
+
+program
+  .command("diff")
+  .argument("<branch>", "branch name")
+  .description("Show unstaged changes in a session's worktree")
+  .action(async (branch: string) => {
+    const root = await git.repoRoot()
+    const session = await state.getSession(root, branch)
+    if (!session) {
+      console.error(`No session found for branch "${branch}".`)
+      process.exit(1)
+    }
+
+    const result = await $`git -C ${session.worktree} diff`.nothrow()
+    if (result.exitCode !== 0) {
+      console.error("git diff failed")
+      process.exit(1)
+    }
+  })
+
 // ── sandlot vm ───────────────────────────────────────────────────────
 
 const vmCmd = program.command("vm").description("Manage the sandlot VM")