content: document statistics (stats.sx) + 17 tests (433/433)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

lib/content/tests/stats.sx

@@ -0,0 +1,68 @@
+;; Extension — document statistics.
+
+(st-bootstrap-classes!)
+(content/bootstrap!)
+(content-bootstrap-text!)
+(content-bootstrap-section!)
+
+;; ── empty doc ──
+(define e (doc-empty "e"))
+(content-test "empty words" (content/word-count e) 0)
+(content-test "empty chars" (content/char-count e) 0)
+(content-test "empty blocks" (content/block-count e) 0)
+(content-test "empty reading" (content/reading-minutes e) 0)
+(content-test "empty stats" (content/stats e) {:blocks 0 :reading-minutes 0 :words 0 :chars 0})
+
+;; ── simple doc ──
+(define
+  d
+  (doc-append
+    (doc-append (doc-empty "d") (mk-heading "h" 1 "Hello World"))
+    (mk-text "p" "one two three")))
+(content-test "word count" (content/word-count d) 5)
+(content-test
+  "char count"
+  (content/char-count d)
+  (string-length "Hello World one two three"))
+(content-test "block count" (content/block-count d) 2)
+(content-test "reading rounds up" (content/reading-minutes d) 1)
+
+;; ── reading time at 0 vs 1 word ──
+(content-test
+  "one word one minute"
+  (content/reading-minutes (doc-append (doc-empty "d") (mk-text "p" "hi")))
+  1)
+
+;; ── block count includes nested section children ──
+(define
+  nested
+  (doc-append
+    (doc-empty "d")
+    (mk-section
+      "s"
+      (list (mk-heading "nh" 1 "A") (mk-text "np" "b c")))))
+(content-test
+  "block count counts section + children"
+  (content/block-count nested)
+  3)
+(content-test
+  "word count descends into section"
+  (content/word-count nested)
+  3)
+
+;; ── deep nesting ──
+(define
+  deep
+  (doc-append
+    (doc-empty "d")
+    (mk-section
+      "o"
+      (list (mk-text "a" "x") (mk-section "i" (list (mk-text "b" "y z")))))))
+(content-test "deep block count" (content/block-count deep) 4)
+(content-test "deep word count" (content/word-count deep) 3)
+
+;; ── stats dict shape ──
+(define s (content/stats d))
+(content-test "stats words" (get s :words) 5)
+(content-test "stats blocks" (get s :blocks) 2)
+(content-test "stats has reading" (get s :reading-minutes) 1)