Remove rehype-add-classes (#2309)

* Remove rehype-add-classes

* Fix the markdown plugin test

1 files changed, 16 insertions, 0 deletions

diff --git a/examples/with-markdown-plugins/add-classes.mjs b/examples/with-markdown-plugins/add-classes.mjs
new file mode 100644
index 000000000..54879e55d
--- /dev/null
+++ b/examples/with-markdown-plugins/add-classes.mjs
@@ -0,0 +1,16 @@
+import { selectAll } from 'hast-util-select';
+
+export default additions => {
+    const adders = Object.entries(additions).map(adder);
+    return node => adders.forEach(a => a(node));
+};
+
+const adder = ([selector, className]) => {
+    const writer = write(className);
+    return node => selectAll(selector, node).forEach(writer);
+};
+
+const write = className => ({ properties }) => {
+    if(!properties.className) properties.className = className;
+    else properties.className += ` ${className}`;
+};