feat(sessions): show global recent sessions without picking a directory (#144)

session.list() now fetches GET /experimental/session (all sessions across
every directory) and falls back to the legacy directory-scoped GET /session
only on 404 (older servers). A directory-less /session is directory-scoped and
returns [] when the active dir has no sessions, so the Recent Sessions list was
empty unless the user first picked a folder.

Global shaping (roots filter, title search, sort by time.updated desc, limit)
moved to a pure, unit-tested src/lib/session-list.ts (no expo/fetch import) with
10 node --test cases.

Co-authored-by: dzianisv <engineer@gray-knight-m1.local>

src/lib/sdk.ts

@@ -6,6 +6,7 @@ import { fetch as expoFetch } from "expo/fetch"
 import { buildRequestHeaders } from "./headers"
 import { SSEParser } from "./sse"
 import { apiErrorFor } from "./api-error"
+import { loadSessionList } from "./session-list"
 import type { FileRoot } from "./file-roots"
 
 export { ApiAuthError, isAuthError } from "./api-error"
@@ -342,14 +343,33 @@ export function createClient(config: ClientConfig) {
     },
 
     session: {
-      list: (params?: { roots?: boolean; limit?: number; search?: string }) => {
-        const query = new URLSearchParams()
-        if (params?.roots) query.set("roots", "true")
-        if (params?.limit) query.set("limit", String(params.limit))
-        if (params?.search) query.set("search", params.search)
-        const qs = query.toString()
-        return request<Session[]>(config, `/session${qs ? `?${qs}` : ""}`)
+      // Prefer the GLOBAL experimental endpoint (all sessions across every
+      // directory) so the Recent Sessions list works without the user first
+      // picking a folder — a directory-less GET /session is directory-scoped
+      // and returns [] on servers whose active dir has no sessions. Shaping
+      // (roots filter, search, sort-by-updated, limit) happens client-side in
+      // loadSessionList; we fetch /experimental/session with no query params
+      // because the server applies `limit` before we can filter to roots.
+      // Falls back to the legacy /session path only on 404 (older servers).
+      list: (params?: { roots?: boolean; limit?: number; search?: string }): Promise<Session[]> =>
+        loadSessionList(
+          {
+            getExperimental: async (): Promise<Session[] | null> => {
+              const response = await fetchWithTimeout(`${config.baseUrl}/experimental/session`, {
+                headers: createHeaders(config),
+              })
+              // Older servers lack this route — signal fallback to legacy /session.
+              if (response.status === 404) return null
+              if (!response.ok) {
+                const body = await response.text()
+                throw apiErrorFor(response.status, `API Error: ${response.status} - ${body}`)
+              }
+              return response.json()
             },
+            getLegacy: (query) => request<Session[]>(config, `/session${query}`),
+          },
+          params,
+        ),
 
       get: (sessionID: string) => request<Session>(config, `/session/${sessionID}`),
 

src/lib/session-list.test.ts

@@ -0,0 +1,130 @@
+import { test } from "node:test"
+import assert from "node:assert/strict"
+import { loadSessionList, normalizeSessions, legacySessionQuery, type SessionListTransport } from "./session-list.ts"
+import type { Session } from "./sdk.ts"
+
+// Minimal Session factory — only the fields the list logic reads.
+function session(over: Partial<Session> & { id: string }): Session {
+  return {
+    id: over.id,
+    slug: over.slug ?? over.id,
+    projectID: "p",
+    directory: over.directory ?? "/dir",
+    title: over.title ?? over.id,
+    version: "1",
+    time: over.time ?? { created: 0, updated: 0 },
+    ...over,
+  } as Session
+}
+
+// A fake transport that records which endpoint got hit. getExperimental
+// resolves to Session[] (200), null (404 → legacy fallback), or throws (other
+// non-2xx), mirroring the real sdk.ts transport contract.
+function transport(opts: {
+  experimental?: Session[] | null
+  experimentalThrows?: Error
+  legacy?: Session[]
+}): SessionListTransport & { calls: string[] } {
+  const calls: string[] = []
+  return {
+    calls,
+    getExperimental: async () => {
+      calls.push("experimental")
+      if (opts.experimentalThrows) throw opts.experimentalThrows
+      return opts.experimental === undefined ? [] : opts.experimental
+    },
+    getLegacy: async (query: string) => {
+      calls.push(`legacy${query}`)
+      return opts.legacy ?? []
+    },
+  }
+}
+
+test("loadSessionList: (a) calls /experimental/session first (global)", async () => {
+  const t = transport({ experimental: [session({ id: "a" })] })
+  await loadSessionList(t, { roots: true, limit: 50 })
+  assert.equal(t.calls[0], "experimental")
+  assert.ok(!t.calls.some((c) => c.startsWith("legacy")), "must not hit legacy /session when experimental works")
+})
+
+test("loadSessionList: (b) filters to roots (no parentID) when roots:true", async () => {
+  const t = transport({
+    experimental: [
+      session({ id: "root1" }),
+      session({ id: "child1", parentID: "root1" }),
+      session({ id: "root2" }),
+      session({ id: "child2", parentID: "root2" }),
+    ],
+  })
+  const out = await loadSessionList(t, { roots: true })
+  assert.deepEqual(
+    out.map((s) => s.id).sort(),
+    ["root1", "root2"],
+    "children (with parentID) must be excluded",
+  )
+})
+
+test("loadSessionList: roots not set keeps children too", async () => {
+  const t = transport({ experimental: [session({ id: "root1" }), session({ id: "child1", parentID: "root1" })] })
+  const out = await loadSessionList(t, {})
+  assert.equal(out.length, 2)
+})
+
+test("loadSessionList: (c) falls back to /session on 404 (older server)", async () => {
+  const legacy = [session({ id: "legacy-a" })]
+  const t = transport({ experimental: null, legacy })
+  const out = await loadSessionList(t, { roots: true, limit: 50 })
+  assert.equal(t.calls[0], "experimental")
+  assert.equal(t.calls[1], "legacy?roots=true&limit=50", "must call legacy with preserved query params")
+  assert.deepEqual(out, legacy, "returns the legacy payload unchanged")
+})
+
+test("loadSessionList: (d) sorts by time.updated descending (most recent first)", async () => {
+  const t = transport({
+    experimental: [
+      session({ id: "old", time: { created: 0, updated: 100 } }),
+      session({ id: "newest", time: { created: 0, updated: 300 } }),
+      session({ id: "mid", time: { created: 0, updated: 200 } }),
+    ],
+  })
+  const out = await loadSessionList(t, { roots: true })
+  assert.deepEqual(out.map((s) => s.id), ["newest", "mid", "old"])
+})
+
+test("loadSessionList: applies limit AFTER root-filter + sort", async () => {
+  const t = transport({
+    experimental: [
+      session({ id: "c1", parentID: "r", time: { created: 0, updated: 999 } }),
+      session({ id: "r1", time: { created: 0, updated: 100 } }),
+      session({ id: "r2", time: { created: 0, updated: 200 } }),
+      session({ id: "r3", time: { created: 0, updated: 300 } }),
+    ],
+  })
+  const out = await loadSessionList(t, { roots: true, limit: 2 })
+  // Children excluded first, then sort desc, then take 2 → r3, r2 (not the child).
+  assert.deepEqual(out.map((s) => s.id), ["r3", "r2"])
+})
+
+test("loadSessionList: search matches title case-insensitively", async () => {
+  const t = transport({
+    experimental: [session({ id: "1", title: "Fix Auth Bug" }), session({ id: "2", title: "Add feature" })],
+  })
+  const out = await loadSessionList(t, { search: "AUTH" })
+  assert.deepEqual(out.map((s) => s.id), ["1"])
+})
+
+test("loadSessionList: non-404 experimental error propagates (no silent fallback)", async () => {
+  const t = transport({ experimentalThrows: new Error("API Error: 500 - boom") })
+  await assert.rejects(() => loadSessionList(t, {}), /500/)
+  assert.ok(!t.calls.some((c) => c.startsWith("legacy")), "500 must NOT fall back to legacy")
+})
+
+test("normalizeSessions: tolerates non-array input", () => {
+  assert.deepEqual(normalizeSessions(undefined as unknown as Session[]), [])
+})
+
+test("legacySessionQuery: builds the same query the old code sent", () => {
+  assert.equal(legacySessionQuery({ roots: true, limit: 50 }), "?roots=true&limit=50")
+  assert.equal(legacySessionQuery({}), "")
+  assert.equal(legacySessionQuery({ search: "x" }), "?search=x")
+})

src/lib/session-list.ts

@@ -0,0 +1,70 @@
+// Pure, transport-agnostic logic for listing sessions, extracted from sdk.ts so
+// it's unit-testable under plain `node --test` without importing expo/fetch
+// (sdk.ts is RN-only) — same pattern as api-error.ts / file-roots.ts.
+//
+// Why this exists: a directory-less `GET /session` is directory-SCOPED and
+// returns [] on a server whose active directory has no sessions, so the Recent
+// Sessions list showed nothing unless the user first picked a folder. The
+// global `GET /experimental/session` returns EVERY session across ALL
+// directories. We prefer it, and fall back to the legacy directory path only on
+// 404 (older servers without the experimental route).
+import type { Session } from "./sdk"
+
+export interface SessionListParams {
+  roots?: boolean
+  limit?: number
+  search?: string
+}
+
+export interface SessionListTransport {
+  // GET /experimental/session with NO query params — the server applies `limit`
+  // BEFORE we can filter to roots, so limiting server-side would truncate the
+  // pool and yield too few root sessions. We fetch the full global list and
+  // shape it client-side via normalizeSessions. Resolves to null when the route
+  // is absent (HTTP 404 on older servers) so we fall back to the legacy path.
+  // Any other non-2xx is thrown by the transport (parity with request()).
+  getExperimental: () => Promise<Session[] | null>
+  // Legacy directory-scoped GET /session<query>, used only when the experimental
+  // route is absent. Its behavior is unchanged from before this feature.
+  getLegacy: (query: string) => Promise<Session[]>
+}
+
+// Shape the global session pool to match the list UI's intent: when roots:true,
+// keep only top-level sessions (no parentID); case-insensitive title search;
+// most-recently-updated first; then apply limit. Order matters — limit is
+// applied LAST so it caps the visible roots, not the raw (root+child) pool.
+export function normalizeSessions(all: Session[], params?: SessionListParams): Session[] {
+  let out = Array.isArray(all) ? all.slice() : []
+  if (params?.roots) out = out.filter((s) => !s.parentID)
+  if (params?.search) {
+    const q = params.search.toLowerCase()
+    out = out.filter((s) => (s.title ?? "").toLowerCase().includes(q))
+  }
+  out.sort((a, b) => (b.time?.updated ?? 0) - (a.time?.updated ?? 0))
+  if (params?.limit != null) out = out.slice(0, params.limit)
+  return out
+}
+
+// Build the query string for the legacy directory-scoped /session fallback,
+// preserving the exact params the old code sent so old servers behave as before.
+export function legacySessionQuery(params?: SessionListParams): string {
+  const query = new URLSearchParams()
+  if (params?.roots) query.set("roots", "true")
+  if (params?.limit) query.set("limit", String(params.limit))
+  if (params?.search) query.set("search", params.search)
+  const qs = query.toString()
+  return qs ? `?${qs}` : ""
+}
+
+// List sessions globally: prefer /experimental/session (all directories), shape
+// client-side, and fall back to the legacy /session path only when the
+// experimental route is absent (transport resolves null on 404). Any other
+// non-2xx is surfaced by the transport, exactly as before this feature.
+export async function loadSessionList(
+  transport: SessionListTransport,
+  params?: SessionListParams,
+): Promise<Session[]> {
+  const all = await transport.getExperimental()
+  if (all === null) return transport.getLegacy(legacySessionQuery(params))
+  return normalizeSessions(all, params)
+}