Markdown messages support

Gemfile

@@ -43,6 +43,7 @@ gem "net-http-persistent"
 gem "kredis"
 gem "platform_agent"
 gem "thruster"
+gem "redcarpet"
 
 group :development, :test do
   gem "debug"

Gemfile.lock

@@ -285,6 +285,7 @@ GEM
     rdoc (6.14.2)
       erb
       psych (>= 4.0.0)
+    redcarpet (3.6.1)
     redis (5.4.1)
       redis-client (>= 0.22.0)
     redis-client (0.25.2)
@@ -423,6 +424,7 @@ DEPENDENCIES
   puma (~> 6.6)
   rails!
   rails_autolink
+  redcarpet
   redis (~> 5.4)
   resque (~> 2.7.0)
   resque-pool (~> 0.7.1)

app/helpers/content_filters.rb

@@ -1,3 +1,3 @@
 module ContentFilters
-  TextMessagePresentationFilters = ActionText::Content::Filters.new(RemoveSoloUnfurledLinkText, StyleUnfurledTwitterAvatars, SanitizeTags)
+  TextMessagePresentationFilters = ActionText::Content::Filters.new(MarkdownFilter, RemoveSoloUnfurledLinkText, StyleUnfurledTwitterAvatars, SanitizeTags)
 end

app/helpers/content_filters/markdown_filter.rb

@@ -0,0 +1,52 @@
+class ContentFilters::MarkdownFilter < ActionText::Content::Filter
+  def applicable?
+    contains_markdown?(content.to_plain_text)
+  end
+
+  def apply
+    # Process the entire content as markdown
+    plain_text = content.to_plain_text
+    html = markdown_to_html(plain_text)
+
+    # Replace the entire fragment content with the HTML
+    fragment.update do |source|
+      source.inner_html = html
+    end
+  end
+
+  private
+
+  def contains_markdown?(text)
+    # Check for common markdown patterns
+    text.match?(/\*\*.*\*\*|__.*__|\*.*\*|_.*_|`.*`|#{Regexp.escape("```")}.*#{Regexp.escape("```")}|^#{Regexp.escape("#")}|^#{Regexp.escape("-")}|^#{Regexp.escape("*")}|^#{Regexp.escape("1.")}|\[.*\]\(.*\)/)
+  end
+
+  def markdown_to_html(text)
+    renderer = Redcarpet::Render::HTML.new(
+      filter_html: false,
+      no_images: false,
+      no_links: false,
+      no_styles: false,
+      safe_links_only: false,
+      with_toc_data: false,
+      hard_wrap: true,
+      link_attributes: { target: "_blank" }
+    )
+
+    markdown = Redcarpet::Markdown.new(renderer, {
+      autolink: true,
+      disable_indented_code_blocks: false,
+      fenced_code_blocks: true,
+      footnotes: false,
+      highlight: false,
+      no_intra_emphasis: false,
+      space_after_headers: false,
+      strikethrough: true,
+      superscript: false,
+      tables: true,
+      underline: true
+    })
+
+    markdown.render(text)
+  end
+end

app/helpers/messages_helper.rb

@@ -57,7 +57,9 @@ def message_presentation(message)
     when "sound"
       message_sound_presentation(message)
     else
-      auto_link h(ContentFilters::TextMessagePresentationFilters.apply(message.body.body)), html: { target: "_blank" }
+      # Apply markdown rendering first, then other content filters
+      processed_content = ContentFilters::TextMessagePresentationFilters.apply(message.body.body)
+      auto_link processed_content, html: { target: "_blank" }
     end
   rescue Exception => e
     Sentry.capture_exception(e, extra: { message: message })