Markdown support

On Sagittarius, I was, well still am, using scribble, which the parser is ported from Chibi Scheme, to write the document. Recently, though it's been already a couple of years, I've been thinking that using one of the documentation formats might be better so that users can read better on the repository if they want to use the latest version.

So, I've updated (text markdown) library to support better Markdown. The library is based on commonmark-java, and more or less compliant with Commonmark specifications. The library keeps the old behaviour, which generates a sort of old intermediate format and HTML, though that should be considered deprecated.

The basic usage of the library can be like this:

(import (rnrs)
        (text markdown)
        (text sxml serializer))

(define (main args)
  (let ((file (cadr args)))
    (call-with-input-file file
      (lambda (in)
        (let ((node (parse-markdown markdown-parser in)))
          (srl:sxml->html-noindent
           (markdown-converter:convert default-markdown-converter 'html node)
           (current-output-port)))))))

So parse-markdown procedure parses the input textual port according to the given markdown-parser, which is one of the default parsers provided by the library. The other default parser is commonmark-parser, which strictly conforms Commonmark specification.

markdown-parser

This supports most of the GFM, footnotes and definition list

commonmark-parser

This only supports things listed on Commonmark specification. So, no table, no strikethrough or others.

The above script is actually used to generate this post. This means, obviously, the markdown-parser is used (as the code already shows :D)

NOTE: Below is the convenient (also for my memo) command to generate an HTML post.

# For Mac
sash blogpost-markdown.scm post.md | pbcopy

There's also a library called (text markdown extensions) and (text markdown converters). These libraries provide an API / framework to provide custom extensions, such as GFM, which is mostly supported by the library.

Next step

Sagittarius document requires a bit more tweaks. Below are the requirements

• Table of contents
• Index table
• eval expression
• Page split per section
• Proper anchor per pages
• Navigation bar

Most of the things are done already, just a bit more. I think after this is done, I can finally release 0.9.9.