From ed7717fef53db3b3aa5593fbb2649313e75a0f31 Mon Sep 17 00:00:00 2001
From: Lukasz Kasprzak <lukas@labunix.xyz>
Date: Fri, 24 Jul 2026 15:25:50 +0200
Subject: cli: --rand/--rand-v (random verse) + --rand-ch (random chapter) from
 the corpus, using the config default version; v0.16.0

---
 internal/bible/bible.go      | 12 ++++++++++++
 internal/bible/bible_test.go | 19 +++++++++++++++++++
 internal/bible/booktable.go  |  9 +++++++++
 3 files changed, 40 insertions(+)

(limited to 'internal/bible')

diff --git a/internal/bible/bible.go b/internal/bible/bible.go
index 312daeb..1603188 100644
--- a/internal/bible/bible.go
+++ b/internal/bible/bible.go
@@ -71,3 +71,15 @@ func Chapters(version, book string) []int {
 	sort.Ints(chaps)
 	return chaps
 }
+
+// CorpusBooks returns the book names present in a version's corpus, sorted
+// (empty for a version with no embedded corpus, e.g. "bt").
+func CorpusBooks(version string) []string {
+	c := load(version)
+	books := make([]string, 0, len(c.books))
+	for b := range c.books {
+		books = append(books, b)
+	}
+	sort.Strings(books)
+	return books
+}
diff --git a/internal/bible/bible_test.go b/internal/bible/bible_test.go
index 804b8c4..71a2c89 100644
--- a/internal/bible/bible_test.go
+++ b/internal/bible/bible_test.go
@@ -52,6 +52,25 @@ func TestVul2Kings(t *testing.T) {
 	}
 }
 
+func TestCorpusBooks(t *testing.T) {
+	books := CorpusBooks("wuj")
+	if len(books) == 0 {
+		t.Fatal("wuj corpus has no books")
+	}
+	found := false
+	for _, b := range books {
+		if b == "John" {
+			found = true
+		}
+	}
+	if !found {
+		t.Errorf("wuj CorpusBooks missing John")
+	}
+	if got := CorpusBooks("bt"); len(got) != 0 {
+		t.Errorf("bt has no corpus, got %d books", len(got))
+	}
+}
+
 func TestChapters(t *testing.T) {
 	ch := Chapters("wuj", "John")
 	if len(ch) == 0 || ch[0] != 1 {
diff --git a/internal/bible/booktable.go b/internal/bible/booktable.go
index 9ec95be..ac7ea95 100644
--- a/internal/bible/booktable.go
+++ b/internal/bible/booktable.go
@@ -154,6 +154,15 @@ func (t *BookTable) shortcut(dialect, canonical string) string {
 	return ""
 }
 
+// Abbrev returns the dialect's primary abbreviation for a canonical book,
+// falling back to the canonical name when the dialect has no entry.
+func (t *BookTable) Abbrev(dialect, canonical string) string {
+	if a := t.shortcut(dialect, canonical); a != "" {
+		return a
+	}
+	return canonical
+}
+
 // FormatRef renders a canonical English reference ("John 20:1,11-18") in the
 // dialect's sigla: the dialect's book shortcut plus its number style -- English
 // "Jn 20:1,11-18" (colon chapter:verse, comma groups); Polish "J 20, 1. 11-18"
-- 
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