[allura:tickets] #6622 Convert or handle Github markdown extensions

[Igor Bondarenko <je...@users.sf.net>]

- **status**: open --> in-progress



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** [tickets:#6622] Convert or handle Github markdown extensions**

**Status:** in-progress
**Labels:** import github 42cc 
**Created:** Fri Aug 30, 2013 01:55 PM UTC by Dave Brondsema
**Last Updated:** Fri Aug 30, 2013 01:55 PM UTC
**Owner:** nobody

When importing github content (tickets, wiki, comments) we should deal with their special markup.  For example, code blocks with optional language specification:

~~~~
```javascript
function fancyAlert(arg) {
  if(arg) {
    $.facebox({div:'#foo'})
  }
}
```
~~~~

should be converted to:

<pre>
~~~~
function fancyAlert(arg) {
  if(arg) {
    $.facebox({div:'#foo'})
  }
}
~~~~
</pre>

And strikethrough `~~example~~` should be converted to `<s>example</s>`.  This we could possibly support directly in our Markdown renderer if we wanted to.  That would also allow it to work for Markdown files in git repos (since we won't modify those during import).

Emoji I don't think we should handle (yet?)

Cross-reference syntax https://help.github.com/articles/github-flavored-markdown#references we may want to consider handling.  See also Trac syntax [#6140] handling.

Converting markdown can be tricky to get right, so we have to be careful that we only convert the right content.  Nested markup, escaped markup, etc. 


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