test(calendar): EF oracle vs missalemeum 2025-2026 (0 season mismatches)

temporalEF validated against Divinum Officium data. Season-mapping handles the
Whit octave (Paschaltide), the Christmas vigil (Advent), and the resumed
Epiphany Sundays (within Time after Pentecost).

1 files changed, 38 insertions, 0 deletions

diff --git a/scripts/build-oracle-ef.sh b/scripts/build-oracle-ef.sh
new file mode 100755
index 0000000..71174ae
--- /dev/null
+++ b/scripts/build-oracle-ef.sh
@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+# build-oracle-ef.sh — generate the EF (1962) regression oracle by fetching
+# missalemeum's per-date proper API (the same source lectio's trad scraper uses,
+# built on Divinum Officium data) for 2025-2026.
+#
+# NOT run by `go test`. Requires network + curl + jq + GNU date. From repo root:
+#   scripts/build-oracle-ef.sh
+# Writes internal/calendar/testdata/oracle-ef.json:
+#   { "YYYY-MM-DD": {"tempora": "...", "title": "...", "rank": N, "colour": "w"} }
+# tempora is "" when missalemeum returns null (then the temporal identity is in
+# title); the Go test derives the season from tempora-or-title.
+set -euo pipefail
+
+out=internal/calendar/testdata/oracle-ef.json
+mkdir -p "$(dirname "$out")"
+work=$(mktemp -d)
+
+for y in 2025 2026; do
+  d="$y-01-01"
+  while [ "$(date -d "$d" +%Y)" = "$y" ]; do
+    echo "$d"
+    d=$(date -d "$d +1 day" +%F)
+  done
+done > "$work/dates"
+
+fetch() {
+  local d="$1"
+  local j
+  j=$(curl -sf "https://www.missalemeum.com/en/api/v5/proper/$d" || true)
+  printf '%s' "$j" | jq -c --arg d "$d" \
+    '{($d): (.[0].info | {tempora:(.tempora // ""), title:.title, rank:.rank, colour:(.colors|join(""))})}' \
+    2>/dev/null || true
+}
+export -f fetch
+
+xargs -P 12 -I{} bash -c 'fetch "$@"' _ {} < "$work/dates" | jq -s 'add' > "$out"
+echo "wrote $out ($(jq 'length' "$out") days)" >&2
+rm -rf "$work"