Rails) What Markdown Should I Use Now?

I need the following features:

1. hard-wrap text
2. auto link (make urls into clickable links)
3. @name should turn into links to user/show action (I should be able to write this helper method)
4. prevent code injection

As far as I've learned, redcarpet doesn't seem to work properly, and I found redcloth to be the choice. But it seems a little outdated, and it doesn't provide filter_html or autolink options. I could install gems sanitize and autolink to use with redcloth but I believe there would be a better way.

Can anyone give me suggestions?

I'd recommend checking out the html-pipeline gem. It has filters for doing a lot of what you want and includes:

• MentionFilter - replace @user mentions with links
• AutolinkFilter - auto_linking urls in HTML
• CamoFilter - replace http image urls with camo-fied https versions
• EmailReplyFilter - util filter for working with emails
• EmojiFilter - everyone loves emoji!
• HttpsFilter - HTML Filter for replacing http github urls with https versions.
• ImageMaxWidthFilter - link to full size image for large images
• MarkdownFilter - convert markdown to html
• PlainTextInputFilter - html escape text and wrap the result in a div
• SanitizationFilter - whitelist sanitize user markup
• SyntaxHighlightFilter - code syntax highlighter with linguist
• TextileFilter - convert textile to html
• TableOfContentsFilter - anchor headings with name attributes