Make sanitize convert text alignment styles to bootstrap classes

The kramdown converter for markdown uses inline styles for table
column alignment which gets lost when we strip the styles so add
bootstrap classes to replace it.

diff --git a/config/initializers/sanitize.rb b/config/initializers/sanitize.rb
index a6cce19a96633437469f0345c07a350825345511..c9d6a5dbac75d48b693e7b1927c19b1c9a297f30 100644 (file)
--- a/config/initializers/sanitize.rb
+++ b/config/initializers/sanitize.rb
@@ -3,10 +3,22 @@ Sanitize::Config::OSM = Sanitize::Config.merge(
   :elements => Sanitize::Config::RELAXED[:elements] - %w[div style],
   :remove_contents => %w[script style],
   :transformers => lambda do |env|
+    style = env[:node]["style"] || ""
+
     env[:node].remove_class
-    env[:node].kwattr_remove("style", nil)
+    env[:node].remove_attribute("style")
+
     env[:node].add_class("table table-sm w-auto") if env[:node_name] == "table"
 
+    case style
+    when /\btext-align:\s+left\b/
+      env[:node].add_class("text-start")
+    when /\btext-align:\s+center\b/
+      env[:node].add_class("text-center")
+    when /\btext-align:\s+right\b/
+      env[:node].add_class("text-end")
+    end
+
     if env[:node_name] == "a"
       rel = env[:node]["rel"] || ""