add minDepth option

Author: dmca-glasgow

lib/search.js

@@ -18,6 +18,11 @@
  *
  *   This is inclusive: when set to `3`, level three headings are included
  *   (those with three hashes, `###`).
+ * @property {Rank | null | undefined} [minDepth=6]
+ *   Minimum heading depth to include in the table of contents (default: `1`).
+ *
+ *   This is inclusive: when set to `3`, level three headings are included
+ *   (those with three hashes, `###`).
  * @property {string | null | undefined} [skip]
  *   Headings to skip, wrapped in `new RegExp('^(' + value + ')$', 'i')`
  *   (default: `undefined`).
@@ -125,6 +130,7 @@ export function search(root, expression, settings) {
     // A heading after the closing (if we were looking for one).
     if (
       (endIndex || !expression) &&
+      (!settings.minDepth || node.depth >= settings.minDepth) &&
       (!settings.maxDepth || node.depth <= settings.maxDepth) &&
       (!skip || !skip.test(value))
     ) {