Files
jakevin c3912d8e5c feat(reddit/read): --expand-more via /api/morechildren + 7-kind typed errors (#1492)
* feat(reddit/read): add --expand-more via /api/morechildren + 7-kind discriminated union

PR B of the rdt-cli parity follow-up (after PR #1491, see #1481 thread).
Closes the second-largest gap: Reddit's "[+N more replies]" stubs were
opaque markers in the comment tree. With --expand-more, the adapter
follows them by POST-ing the t1 ids to /api/morechildren.json, then
re-threads the returned things back into the tree by parent_id before
walking it.

New args:

- `--expand-more` (bool, default false) — turn on stub expansion.
- `--expand-rounds <N>` (int, default 2, range [1, 5]) — Reddit returns
  fresh "more" stubs at the expansion depth boundary, so up to N rounds
  are run. Strictly validated via `parseExpandRounds` — out-of-range
  raises ArgumentError BEFORE `page.goto`, no silent clamp.

Boy-Scout: the in-browser script now returns a 7-kind discriminated
union instead of a flat row array (matching the PR #1428 / #1491
sediment). Each kind maps 1:1 to a typed error on the Node side:

  - `inaccessible` → EmptyResultError
      401/403/404 on /comments/<id>.json (post-specific access, not
      session-level auth — applies the PR #1491 review-side sediment
      "inaccessible-resource vs session-auth").
  - `auth`         → AuthRequiredError
      401/403 on /api/morechildren (expand-write endpoints often demand
      a logged-in session even when the read endpoint is anonymous).
  - `http`         → CommandExecutionError
  - `malformed`    → CommandExecutionError
      200 with unexpected envelope shape — schema drift, not empty.
  - `parser-drift` → CommandExecutionError
      tree had t1 entries but the walker produced no rows (PR #1491
      review-side sediment "post-construction 0 rows + pre-walk
      non-empty = parser drift, not legitimate empty").
  - `expand-failed`→ CommandExecutionError
      /api/morechildren returned a non-empty json.errors array.
  - `ok`           → returns rows[].

Intermediate keys (kind / detail / httpStatus / where / rows /
expandMeta) deliberately avoid the declared columns (type / author /
score / text) per the PR #1329 silent-column-drop sediment.

Tests:
  clis/reddit/read.test.js — 11 tests
    - Adapter shape (browser / siteSession / columns / args)
    - --expand-more / --expand-rounds present with correct types/defaults
    - parseExpandRounds default / range / non-integer rejection
    - Pre-navigation validation (bad --expand-rounds doesn't reach goto)
    - kind=ok happy path (POST + L0 rows)
    - 6-kind error → typed error mapping
    - Unknown envelope shape → CommandExecutionError
    - Evaluate script embeds expandMore/expandRounds/sort/limit literals
    - Evaluate script contains /api/morechildren POST scaffolding
    - Evaluate script never names declared columns as intermediate keys

Full reddit suite 48/48; full project 3402/3402.

Audits: typed-error-lint 189/189 (0 new), silent-column-drop 103/103
(0 new). Manifest 815 → 815 (existing read entry gets 2 new args).

Existing --limit / --depth / --replies / --max-length keep their
original Math.max-style behaviour (grandfathered in the baseline);
only the new --expand-rounds flag fails fast per the typed-errors
standard.

Refs: https://github.com/jackwener/rdt-cli (browse.read --expand-more)

* fix(reddit): preserve expanded comment tree order

* fix(reddit): fail on partial morechildren expansion
2026-05-13 18:13:11 +08:00
..