Cheapskate

Parses the input as a markdown document. Note that Doc is an instance of ToMarkup, so the document can be converted to Html using toHtml. A simple Text to Html filter would be

markdownToHtml :: Text -> Html
markdownToHtml = toHtml . markdown def

The default value for this type.

Apply a transformation bottom-up to every node of a parsed document. This can be used, for example, to transform specially marked code blocks to highlighted code or images. Here is a simple example that promotes the levels of headers:

promoteHeaders :: Doc -> Doc
promoteHeaders = walk promoteHeader
  where promoteHeader (Header n ils) = Header (n+1) ils
        promoteHeader x              = x

Monadic version of walk.