1 files changed, 13 insertions, 0 deletions
diff --git a/internal/bible/bible.go b/internal/bible/bible.go
index 0254ceb..312daeb 100644
--- a/internal/bible/bible.go
+++ b/internal/bible/bible.go
@@ -2,6 +2,7 @@ package bible
 
 import (
 	"embed"
+	"sort"
 	"strconv"
 	"strings"
 	"sync"
@@ -58,3 +59,15 @@ func load(version string) *corpus {
 func Verses(version, book string, chap int) []Verse {
 	return load(version).books[book][chap]
 }
+
+// Chapters returns the chapter numbers present for a book in a version, sorted
+// ascending (empty if the version has no such book).
+func Chapters(version, book string) []int {
+	chapMap := load(version).books[book]
+	chaps := make([]int, 0, len(chapMap))
+	for ch := range chapMap {
+		chaps = append(chaps, ch)
+	}
+	sort.Ints(chaps)
+	return chaps
+}