events: availability.sx — free/busy + conflict detection on Datalog + 16 tests
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occurrence/booking EDB; rules busy/conflict (canonical pair, half-open
overlap)/busy_in. API ev-busy, ev-conflicts, ev-has-conflict?, ev-free?
(transient qwindow). Integrates with calendar expansion. 53/53 green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
2026-06-07 00:23:51 +00:00
parent 70aea21601
commit 540933bfca
7 changed files with 397 additions and 8 deletions

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;; lib/events/tests/availability.sx — free/busy + conflict rules on Datalog.
(define ev-av-pass 0)
(define ev-av-fail 0)
(define ev-av-failures (list))
(define
ev-av-check!
(fn
(name got expected)
(if
(= got expected)
(set! ev-av-pass (+ ev-av-pass 1))
(do
(set! ev-av-fail (+ ev-av-fail 1))
(append!
ev-av-failures
(str name "\n expected: " expected "\n got: " got))))))
;; Fixture: three occurrences on 2026-06-01.
;; standup 09:0009:30 review 09:1510:15 (overlaps standup)
;; lunch 12:0013:00
(define
ev-av-occs
(fn
()
(list
(ev-occ
(quote standup)
(ev-dt 2026 6 1 9 0)
30)
(ev-occ
(quote review)
(ev-dt 2026 6 1 9 15)
60)
(ev-occ
(quote lunch)
(ev-dt 2026 6 1 12 0)
60))))
(define ev-av-key (fn (id start) (str id "@" start)))
;; alice: standup + review (overlap → conflict). bob: lunch only.
(define
ev-av-db
(fn
()
(ev-avail-db
(ev-av-occs)
(list
(list
(quote alice)
(ev-av-key
(quote standup)
(ev-dt 2026 6 1 9 0)))
(list
(quote alice)
(ev-av-key
(quote review)
(ev-dt 2026 6 1 9 15)))
(list
(quote bob)
(ev-av-key
(quote lunch)
(ev-dt 2026 6 1 12 0)))))))
(define
ev-av-run-all!
(fn
()
(let
((db (ev-av-db)))
(do
(ev-av-check!
"busy lists alice committed intervals ascending"
(ev-busy db (quote alice))
(list
(list
(ev-dt 2026 6 1 9 0)
(ev-dt 2026 6 1 9 30))
(list
(ev-dt 2026 6 1 9 15)
(ev-dt 2026 6 1 10 15))))
(ev-av-check!
"busy lists bob single interval"
(ev-busy db (quote bob))
(list
(list
(ev-dt 2026 6 1 12 0)
(ev-dt 2026 6 1 13 0))))
(ev-av-check!
"busy empty for unknown actor"
(ev-busy db (quote carol))
(list))
(ev-av-check!
"alice has an overlap conflict"
(ev-has-conflict? db (quote alice))
true)
(ev-av-check!
"alice conflict reported once (canonical pair)"
(len (ev-conflicts db (quote alice)))
1)
(ev-av-check!
"bob has no conflict"
(ev-has-conflict? db (quote bob))
false)
(ev-av-check!
"non-overlapping bookings do not conflict"
(ev-has-conflict?
(ev-avail-db
(list
(ev-occ
(quote a)
(ev-dt
2026
6
1
9
0)
30)
(ev-occ
(quote b)
(ev-dt
2026
6
1
9
30)
30))
(list
(list
(quote dave)
(ev-av-key
(quote a)
(ev-dt
2026
6
1
9
0)))
(list
(quote dave)
(ev-av-key
(quote b)
(ev-dt
2026
6
1
9
30)))))
(quote dave))
false)
(ev-av-check!
"alice free in an empty window"
(ev-free?
db
(quote alice)
(ev-dt 2026 6 1 13 0)
(ev-dt 2026 6 1 14 0))
true)
(ev-av-check!
"alice not free overlapping a booking"
(ev-free?
db
(quote alice)
(ev-dt 2026 6 1 9 20)
(ev-dt 2026 6 1 9 40))
false)
(ev-av-check!
"free? is half-open at the trailing edge"
(ev-free?
db
(quote alice)
(ev-dt 2026 6 1 10 15)
(ev-dt 2026 6 1 11 0))
true)
(ev-av-check!
"free? is half-open at the leading edge"
(ev-free?
db
(quote bob)
(ev-dt 2026 6 1 11 0)
(ev-dt 2026 6 1 12 0))
true)
(ev-av-check!
"free? false when window straddles a booking edge"
(ev-free?
db
(quote bob)
(ev-dt 2026 6 1 11 0)
(ev-dt 2026 6 1 12 1))
false)
(ev-av-check!
"free? query leaves db reusable (no leaked qwindow)"
(do
(ev-free?
db
(quote alice)
(ev-dt 2026 6 1 9 0)
(ev-dt 2026 6 1 9 30))
(ev-busy db (quote bob)))
(list
(list
(ev-dt 2026 6 1 12 0)
(ev-dt 2026 6 1 13 0))))
(let
((daily (ev-expand (ev-event (quote class) (ev-dt 2026 6 1 9 0) 60 {:freq :daily :count 3} 1) (ev-date 2026 6 1) (ev-date 2026 7 1))))
(let
((db2 (ev-avail-db daily (map (fn (o) (list (quote sam) (ev-occ-key o))) daily))))
(do
(ev-av-check!
"expanded daily occurrences become busy intervals"
(len (ev-busy db2 (quote sam)))
3)
(ev-av-check!
"no conflicts among disjoint daily occurrences"
(ev-has-conflict? db2 (quote sam))
false)
(ev-av-check!
"busy on day two of the series"
(ev-free?
db2
(quote sam)
(ev-dt
2026
6
2
9
30)
(ev-dt
2026
6
2
9
45))
false))))))))
(define
ev-availability-tests-run!
(fn
()
(do
(set! ev-av-pass 0)
(set! ev-av-fail 0)
(set! ev-av-failures (list))
(ev-av-run-all!)
{:failures ev-av-failures :total (+ ev-av-pass ev-av-fail) :passed ev-av-pass :failed ev-av-fail})))