1 files changed, 33 insertions, 0 deletions
diff --git a/internal/caldata/caldata.go b/internal/caldata/caldata.go
index 14b3985..92f9327 100644
--- a/internal/caldata/caldata.go
+++ b/internal/caldata/caldata.go
@@ -19,6 +19,39 @@ var romanCalendar []byte
 //go:embed tridentine-calendar.ini
 var tridentineCalendar []byte
 
+//go:embed tridentine-lectionary.ini
+var tridentineLectionary []byte
+
+// efTempReadings maps an EF temporal-day slug to its readings (parsed once).
+var efTempReadings = parseLectionary(tridentineLectionary)
+
+func parseLectionary(data []byte) map[string][]calendar.Reading {
+	l, err := ParseLayer(data)
+	if err != nil {
+		panic(fmt.Sprintf("caldata: tridentine-lectionary.ini invalid: %v", err))
+	}
+	out := map[string][]calendar.Reading{}
+	for slug, rc := range l.Cels {
+		var rs []calendar.Reading
+		for _, part := range []string{"first", "psalm", "second", "gospel"} {
+			if c := rc.Fields[part]; c != "" {
+				rs = append(rs, calendar.Reading{Part: part, Citation: c})
+			}
+		}
+		out[slug] = rs
+	}
+	return out
+}
+
+// TemporalReadings returns the temporal-cycle readings for a computed day slug,
+// or nil. Only the EF ("old") temporal lectionary exists so far.
+func TemporalReadings(form, slug string) []calendar.Reading {
+	if form == "old" {
+		return efTempReadings[slug]
+	}
+	return nil
+}
+
 // Universal parses the embedded Ordinary Form universal calendar. It panics on a
 // malformed embedded file (a build-time bug caught by tests).
 func Universal() calendar.Layer {