Add prepend_mod to CommonMark
What does this MR do and why?
Add prepend_mod to Banzai::Filter::MarkdownEngines::CommonMark.
CommonMark is the default markdown engine of GitLab.
JH needs to adjust rendering options for special-case issues, so this class needs to be prepended.
Reference: CommonMarker Render options
| Name | Description |
|---|---|
:DEFAULT |
The default rendering system. |
:SOURCEPOS |
Include source position in rendered HTML. |
:HARDBREAKS |
Treat \n as hardbreaks (by adding <br/>). |
:UNSAFE |
Allow raw/custom HTML and unsafe links. |
:NOBREAKS |
Translate \n in the source to a single whitespace. |
:VALIDATE_UTF8 |
Replace illegal sequences with the replacement character U+FFFD. |
:SMART |
Use smart punctuation (curly quotes, etc.). |
:GITHUB_PRE_LANG |
Use GitHub-style <pre lang> for fenced code blocks. |
:LIBERAL_HTML_TAG |
Support liberal parsing of inline HTML tags. |
:FOOTNOTES |
Render footnotes. |
:STRIKETHROUGH_DOUBLE_TILDE |
Parse strikethroughs by double tildes (compatibility with redcarpet) |
:TABLE_PREFER_STYLE_ATTRIBUTES |
Use style insted of align for table cells. |
:FULL_INFO_STRING |
Include full info strings of code blocks in separate attribute. |
/cc JH EM @prajnamas