bidirectional links

_plugins/empty_front_matter_note_injector.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+EMPTY_FRONT_MATTER = <<~JEKYLL
+  ---
+  ---
+
+JEKYLL
+
+# Inject empty front matter in notes that don't have any
+Jekyll::Hooks.register :site, :after_init do |site|
+  Dir.glob(site.collections['notes'].relative_directory + '/**/*.md').each do |filename|
+    raw_note_content = File.read(filename)
+    unless raw_note_content.start_with?('---')
+      raw_note_content.prepend(EMPTY_FRONT_MATTER)
+      File.write(filename, raw_note_content)
+    end
+  end
+end