FEATURE: Bundle discourse-spoiler-alert plugin into core (#24030)

* FEATURE: Bundle discourse-spoiler-alert plugin into core

Formerly https://github.com/discourse/discourse-spoiler-alert

* DEV: Switch to new addComposerToolbarPopupMenuOption plugin API

`api.addToolbarPopupMenuOptionsCallback` has been deprecated in 913fd3a7b392b492f6344102577960a6eada00ce

This commit was just added to the plugin, so adding it here.

49f86ba72e

plugins/spoiler-alert/spec/pretty_text_spec.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+describe PrettyText do
+  let(:post) { Fabricate(:post) }
+
+  def n(html)
+    html.strip
+  end
+
+  it "can spoil blocks" do
+    md = PrettyText.cook("[spoiler]\nmy tests fail\n[/spoiler]")
+    html = "<div class=\"spoiler\">\n<p>my tests fail</p>\n</div>"
+
+    expect(md).to eq(html)
+  end
+
+  it "can spoil inline" do
+    md = PrettyText.cook("I like watching [spoiler]my tests fail[/spoiler]")
+    html = '<p>I like watching <span class="spoiler">my tests fail</span></p>'
+
+    expect(md).to eq(html)
+  end
+
+  it "can replace spoilers in emails" do
+    md = PrettyText.cook("I like watching [spoiler]my tests fail[/spoiler]")
+    md = PrettyText.format_for_email(md, post)
+    html =
+      "<p>I like watching <span class=\"spoiler\"><a href=\"#{post.full_url}\">spoiler</a></span></p>"
+
+    expect(md).to eq(html)
+  end
+end