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rose-ash/lib/feed/notify.sx
giles b0feb7b01b
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feed: notification feed — per-recipient inbox, verb filter, (verb,object) digest + 8 tests
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-06-06 16:51:53 +00:00

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; feed/notify — a notification feed is a thin layer over a recipient's inbox:
; the events directed at a user, optionally verb-filtered, and a digest that
; collapses "alice, bob and 1 other liked X" by (verb, object).
;
; Requires: lib/feed/normalize.sx, lib/feed/stream.sx, lib/feed/fanout.sx
; (feed/inbox-for, feed/-elem?).
; all inbox events for a user (their raw notifications)
(define feed/notifications (fn (inbox user) (feed/inbox-for inbox user)))
; restrict to notification-worthy verbs (e.g. (list "like" "reply" "follow"))
(define
feed/notify-verbs
(fn
(inbox user verbs)
(feed/filter
(feed/inbox-for inbox user)
(fn (ev) (feed/-elem? (get (get ev :activity) :verb) verbs)))))
; group key "verb|object" — deterministic, sortable
(define
feed/-notify-key
(fn
(ev)
(let
((a (get ev :activity)))
(string-append (get a :verb) "|" (get a :object)))))
; digest: one entry per (verb, object) with the distinct actors and a count,
; ordered by key for determinism.
(define
feed/notify-digest
(fn
(inbox user)
(let
((events (feed/items (feed/inbox-for inbox user))))
(let
((groups (reduce (fn (g ev) (let ((a (get ev :activity)) (k (feed/-notify-key ev))) (let ((cur (get g k {:object (get a :object) :actors (list) :verb (get a :verb)}))) (assoc g k (assoc cur :actors (append (get cur :actors) (list (get a :actor)))))))) {} events)))
(map
(fn
(k)
(let
((grp (get groups k)))
(assoc grp :count (len (get grp :actors)))))
(sort (keys groups)))))))