Latest review note

scripts/review-note

@@ -57,12 +57,31 @@ cmd_write() {
   fi
 }
 
+cmd_latest() {
+  local branch="${1:-$(git branch --show-current)}"
+  local blob obj note br rnd best="" best_round=-1
+  while read -r blob obj; do
+    note=$(git notes --ref="$NOTES_REF" show "$obj") || continue
+    br=$(sed -n 's/^branch: //p' <<<"$note")
+    [ "$br" = "$branch" ] || continue
+    rnd=$(sed -n 's/^round: //p' <<<"$note")
+    [[ "$rnd" =~ ^[0-9]+$ ]] || continue
+    if [ "$rnd" -gt "$best_round" ]; then
+      best_round=$rnd
+      best=$note
+    fi
+  done < <(git notes --ref="$NOTES_REF" list)
+  [ -n "$best" ] || die "no review notes for branch: $branch"
+  printf '%s\n' "$best"
+}
+
 main() {
   local cmd="${1:-}"
   if [ $# -gt 0 ]; then shift; fi
   case "$cmd" in
     show) cmd_show "$@" ;;
     write) cmd_write "$@" ;;
+    latest) cmd_latest "$@" ;;
     *) usage ;;
   esac
 }

scripts/review-note-test

@@ -49,4 +49,23 @@ sed 's/^verdict: request-changes/verdict: approve/' "$note" > "$tmp/note1b"
 "$rn" write "$tmp/note1b" --force
 "$rn" show | grep -q '^verdict: approve$' || fail "show should print the replaced note"
 
-echo "ok: show/write"
+# latest finds the note by branch, even from a newer unreviewed tip
+echo three > c.txt && git add c.txt && git commit -qm three
+"$rn" latest main | grep -q '^verdict: approve$' || fail "latest should find the round 1 note"
+
+# a note for another branch must not leak into the result
+sed -e 's/^branch: main/branch: other/' -e 's/^round: 1/round: 9/' "$tmp/note1b" > "$tmp/other"
+"$rn" write "$tmp/other"
+"$rn" latest main | grep -q '^verdict: approve$' || fail "latest should ignore other branches"
+
+# round 2 on the new tip wins and carries previous (replaces the
+# other-branch note on the same commit, so --force)
+PREV=$(git rev-parse HEAD~1)
+sed -e 's/^round: 1/round: 2/' -e "s/^previous: none/previous: $PREV/" "$tmp/note1b" > "$tmp/note2"
+"$rn" write "$tmp/note2" --force
+"$rn" latest main | grep -q '^round: 2$' || fail "latest should pick the highest round"
+"$rn" latest main | grep -q "^previous: $PREV$" || fail "round 2 should carry previous"
+
+if "$rn" latest nosuch >/dev/null 2>&1; then fail "latest should exit 1 for an unknown branch"; fi
+
+echo "ok: show/write/latest"