Add config command and replace project registry with filesystem discovery

The global registry (registry.json, locking, scan-and-register) was
unnecessary complexity — we can discover repos by scanning ~/.sandlot/
worktree .git pointers. This also moves the --add/--remove flags off
`list` into a proper `config` subcommand for managing settings like
VM memory.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/cli.ts

@@ -4,6 +4,7 @@ import { Command, Option } from "commander"
 import { yellow, reset } from "./fmt.ts"
 import * as git from "./git.ts"
 import * as state from "./state.ts"
+import { action as configAction } from "./commands/config.ts"
 import { action as newAction } from "./commands/new.ts"
 import { action as listAction } from "./commands/list.ts"
 import { action as openAction } from "./commands/open.ts"
@@ -53,8 +54,6 @@ program
   .description("Show all active sessions")
   .option("--json", "Output as JSON")
   .option("-a, --all", "Show sessions across all projects")
-  .option("--add <dir>", "Scan a directory for sandlot projects and register them")
-  .option("-r, --remove <dir>", "Remove a project from the registry")
   .action(listAction)
 
 program

src/commands/list.ts

@@ -4,9 +4,9 @@ import { stat } from "fs/promises"
 import * as git from "../git.ts"
 import * as vm from "../vm.ts"
 import * as state from "../state.ts"
-import { die, reset, dim, green, yellow, cyan, magenta, red } from "../fmt.ts"
+import { reset, dim, green, yellow, cyan, magenta, red } from "../fmt.ts"
 
-// ── Shared rendering ─────────────────────────────────────────────────
+// ── Rendering ────────────────────────────────────────────────────────
 
 const styles: Record<string, { icon: string; color: string }> = {
   idle:   { icon: `${dim}◯${reset}`,     color: dim },
@@ -31,16 +31,12 @@ function renderSessions(
     const status = statusMap.get(s) ?? "idle"
     const { icon, color: bc } = styles[status]
     const maxPrompt = cols - prefixWidth
-    const truncated = maxPrompt < 1 ? "" : prompt.length <= maxPrompt ? prompt : maxPrompt > 3 ? prompt.slice(0, maxPrompt - 3) + "..." : prompt.slice(0, maxPrompt)
+    const truncated = prompt.length <= maxPrompt ? prompt : prompt.slice(0, maxPrompt - 3) + "..."
     console.log(`${icon} ${bc}${s.branch.padEnd(branchWidth)}${reset}  ${dim}${truncated}${reset}`)
   }
 }
 
-function renderLegend() {
+// ── Status resolution ────────────────────────────────────────────────
-  console.log(`\n${dim}◯ idle${reset} · ${cyan}◎ active${reset} · ${yellow}◐ unsaved${reset} · ${green}● saved${reset} · ${magenta}⦿ review${reset}`)
-}
-
-// ── Shared logic ─────────────────────────────────────────────────────
 
 async function resolveStatus(
   s: { branch: string; worktree: string; in_review?: boolean },
@@ -101,13 +97,9 @@ async function backfillPrompts(sessions: { worktree: string; prompt?: string }[]
   }
 }
 
-// ── Commands ─────────────────────────────────────────────────────────
+// ── Command ──────────────────────────────────────────────────────────
 
-export async function action(opts: { json?: boolean; all?: boolean; add?: string; remove?: string }) {
+export async function action(opts: { json?: boolean; all?: boolean }) {
-  if (opts.add) return actionAdd(opts.add)
-  if (opts.remove) return actionRemove(opts.remove)
-
-  // Load sessions with repoRoot attached
   let sessions: state.GlobalSession[]
   if (opts.all) {
     sessions = await state.loadAll()
@@ -128,7 +120,7 @@ export async function action(opts: { json?: boolean; all?: boolean; add?: string
 
   const results = await Promise.all(sessions.map(s => resolveStatus(s, vmRunning)))
   const statusMap = new Map(sessions.map((s, i) => [s, results[i]]))
-  if (vmRunning) await clearStaleReviews(sessions, results)
+  await clearStaleReviews(sessions, results)
 
   if (opts.json) {
     const withStatus = sessions.map(s => ({ ...s, status: statusMap.get(s) ?? "idle" }))
@@ -146,38 +138,6 @@ export async function action(opts: { json?: boolean; all?: boolean; add?: string
     renderSessions(sessions, statusMap)
   }
 
-  renderLegend()
+  console.log(`\n${dim}◯ idle${reset} · ${cyan}◎ active${reset} · ${yellow}◐ unsaved${reset} · ${green}● saved${reset} · ${magenta}⦿ review${reset}`)
   if (!vmRunning) console.log(`\n${red}VM is not running.${reset}`)
 }
-
-async function actionAdd(dir: string) {
-  let registered: string[]
-  try {
-    registered = await state.scanAndRegister(dir)
-  } catch (e) {
-    return die(e instanceof Error ? e.message : `Failed to scan ${dir}`)
-  }
-  if (registered.length === 0) {
-    console.log(`No sandlot projects found under ${dir}`)
-  } else {
-    for (const p of registered) {
-      console.log(`${green}+${reset} ${p}`)
-    }
-    console.log(`\nRegistered ${registered.length} project${registered.length === 1 ? "" : "s"}.`)
-  }
-}
-
-async function actionRemove(dir: string) {
-  const resolved = state.normalizePath(dir)
-  let removed = false
-  try {
-    removed = await state.unregisterProject(dir)
-  } catch {
-    return die("Could not acquire registry lock")
-  }
-  if (removed) {
-    console.log(`${red}-${reset} ${resolved}`)
-  } else {
-    die(`Project not found in registry: ${resolved}`)
-  }
-}

src/state.ts

@@ -1,5 +1,5 @@
-import { join, basename, resolve } from "path"
+import { join, dirname } from "path"
-import { readdir, rename, mkdir, rmdir, stat } from "fs/promises"
+import { readdir, rename } from "fs/promises"
 import { homedir } from "os"
 
 export interface Session {
@@ -45,7 +45,6 @@ export async function setSession(repoRoot: string, session: Session): Promise<vo
   const state = await load(repoRoot)
   state.sessions[session.branch] = session
   await save(repoRoot, state)
-  await registerProject(repoRoot).catch(() => {})
 }
 
 export async function removeSession(repoRoot: string, branch: string): Promise<void> {
@@ -54,171 +53,51 @@ export async function removeSession(repoRoot: string, branch: string): Promise<v
   await save(repoRoot, state)
 }
 
-// ── Global state: ~/.sandlot/registry.json ─────────────────────────
-
-interface GlobalState {
-  projects: string[]  // repo root paths
-}
-
-const GLOBAL_DIR = join(homedir(), ".sandlot")
-const GLOBAL_STATE_PATH = join(GLOBAL_DIR, "registry.json")
-
-async function withGlobalLock<T>(fn: () => Promise<T>): Promise<T> {
-  const lockPath = join(GLOBAL_DIR, "registry.lock")
-  await mkdir(GLOBAL_DIR, { recursive: true })
-  for (let i = 0; i < 20; i++) {
-    try {
-      await mkdir(lockPath)
-    } catch {
-      // If the lock is older than 5 minutes, assume it's stale (crashed process)
-      try {
-        const info = await stat(lockPath)
-        if (Date.now() - info.mtimeMs > 300_000) {
-          await rmdir(lockPath).catch(() => {})
-          // Retry mkdir immediately to close the TOCTOU window
-          try { await mkdir(lockPath) } catch { continue }
-        } else {
-          if (i === 19) throw new Error("Could not acquire registry lock")
-          await Bun.sleep(50)
-          continue
-        }
-      } catch {
-        // Lock dir vanished between our mkdir and stat — retry immediately
-        continue
-      }
-    }
-    try {
-      return await fn()
-    } finally {
-      await rmdir(lockPath).catch(() => {})
-    }
-  }
-  throw new Error("Could not acquire registry lock")
-}
-
-async function loadGlobal(): Promise<GlobalState> {
-  const file = Bun.file(GLOBAL_STATE_PATH)
-  if (await file.exists()) {
-    try {
-      const data = await file.json()
-      if (data && Array.isArray(data.projects)) return { projects: data.projects.filter((p: unknown) => typeof p === "string") }
-    } catch {}
-  }
-  return { projects: [] }
-}
-
-async function saveGlobal(gs: GlobalState): Promise<void> {
-  const tmpPath = GLOBAL_STATE_PATH + ".tmp"
-  await Bun.write(tmpPath, JSON.stringify(gs, null, 2) + "\n")
-  await rename(tmpPath, GLOBAL_STATE_PATH)
-}
-
-export function normalizePath(dir: string): string {
-  return resolve(dir.replace(/^~(?=\/|$)/, homedir()))
-}
-
-async function registerPaths(paths: string[]): Promise<void> {
-  if (paths.length === 0) return
-  await withGlobalLock(async () => {
-    const gs = await loadGlobal()
-    const existing = new Set(gs.projects)
-    let changed = false
-    for (const p of paths) {
-      if (!existing.has(p)) {
-        gs.projects.push(p)
-        changed = true
-      }
-    }
-    if (changed) await saveGlobal(gs)
-  })
-}
-
-/** Register a project directory in the global state. */
-export async function registerProject(repoRoot: string): Promise<void> {
-  await registerPaths([normalizePath(repoRoot)])
-}
-
-/** Remove a project directory from the global state. */
-export async function unregisterProject(dir: string): Promise<boolean> {
-  const target = normalizePath(dir)
-  return withGlobalLock(async () => {
-    const gs = await loadGlobal()
-    const idx = gs.projects.indexOf(target)
-    if (idx === -1) return false
-    gs.projects.splice(idx, 1)
-    await saveGlobal(gs)
-    return true
-  })
-}
-
-/** Recursively scan a directory for .sandlot dirs and register their parent projects. */
-export async function scanAndRegister(dir: string, maxDepth = 5): Promise<string[]> {
-  const root = normalizePath(dir)
-  const found: string[] = []
-
-  async function walk(d: string, depth: number) {
-    if (depth >= maxDepth) return
-    let entries
-    try {
-      entries = await readdir(d, { withFileTypes: true })
-    } catch {
-      return
-    }
-
-    const hasSandlot = entries.some(e => e.isDirectory() && e.name === ".sandlot")
-    if (hasSandlot) {
-      const stateFile = Bun.file(join(d, ".sandlot", "state.json"))
-      if (await stateFile.exists()) {
-        found.push(d)
-      }
-    }
-
-    const children = entries.filter(e => e.isDirectory() && !e.isSymbolicLink() && !e.name.startsWith(".") && e.name !== "node_modules")
-    for (const entry of children) await walk(join(d, entry.name), depth + 1)
-  }
-
-  await walk(root, 0)
-  await registerPaths(found)
-  return found
-}
-
 export interface GlobalSession extends Session {
   repo: string
   repoRoot: string
 }
 
-/** Load all sessions across all registered projects. Prunes stale entries. */
+/** Discover all sessions across all repos by scanning ~/.sandlot/ */
 export async function loadAll(): Promise<GlobalSession[]> {
-  const gs = await loadGlobal()
+  const sandlotDir = join(homedir(), ".sandlot")
   const all: GlobalSession[] = []
-  const stale: string[] = []
 
-  await Promise.all(gs.projects.map(async (project) => {
+  let repoDirs
-    let st: State
   try {
-      st = await load(project)
+    repoDirs = await readdir(sandlotDir, { withFileTypes: true })
   } catch {
-      // Corrupt state.json — skip but don't prune (self-heals on next session activity)
+    return []
-      return
   }
-    if (Object.keys(st.sessions).length === 0) {
-      try { await stat(join(project, ".sandlot")) } catch { stale.push(project) }
-      return
-    }
-    const repo = basename(project)
-    for (const s of Object.values(st.sessions)) {
-      all.push({ ...s, repo, repoRoot: project })
-    }
-  }))
 
-  // Prune projects whose state files no longer exist
+  for (const entry of repoDirs) {
-  if (stale.length > 0) {
+    if (!entry.isDirectory() || entry.name.startsWith(".")) continue
-    const staleSet = new Set(stale)
+    const repoDir = join(sandlotDir, entry.name)
-    await withGlobalLock(async () => {
+
-      const fresh = await loadGlobal()
+    // Find the main repo root from a worktree's .git pointer
-      fresh.projects = fresh.projects.filter(p => !staleSet.has(p))
+    let repoRoot: string | null = null
-      await saveGlobal(fresh)
+    const branchEntries = await readdir(repoDir, { withFileTypes: true }).catch(() => [])
-    }).catch(() => {})
+
+    for (const be of branchEntries) {
+      if (!be.isDirectory() || be.name.startsWith(".")) continue
+      const dotGit = await Bun.file(join(repoDir, be.name, ".git")).text().catch(() => "")
+      const m = dotGit.match(/^gitdir:\s*(.+)/m)
+      if (m) {
+        // gitdir: /path/to/repo/.git/worktrees/<name>
+        const mainGit = m[1].trim().replace(/\/worktrees\/[^/]+$/, "")
+        repoRoot = dirname(mainGit)
+        break
+      }
+    }
+
+    if (repoRoot) {
+      try {
+        const st = await load(repoRoot)
+        for (const session of Object.values(st.sessions)) {
+          all.push({ ...session, repo: entry.name, repoRoot })
+        }
+      } catch {}
+    }
   }
 
   return all