Replace underscores with the proper HTML tags

This was already handled correctly in the case of TeX and CSV, but the
HTML rendering was still to be handled.

Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/app/helpers/title_helper.rb b/app/helpers/title_helper.rb
new file mode 100644
index 0000000..4de2779
--- /dev/null
+++ b/app/helpers/title_helper.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+# Helper functions for dealing with titles of Things.
+module TitleHelper
+  # Returns the given string with underscores to <em></em>.
+  def title_to_html(title:)
+    replace_underscores_with(string: title, open_char: '<em>', close_char: '</em>').html_safe # rubocop:disable Rails/OutputSafety
+  end
+
+  # Replace underscores from a string with the given open/close characters.
+  def replace_underscores_with(string:, open_char:, close_char:)
+    string.gsub(/_([^_]+)_/, "#{open_char}\\1#{close_char}")
+  end
+end