Markdown and HTML filters

[klorenz]

for beeing able to publish gollum wiki pages, I need a preprocess and postprocess filter like gollum has. It works with a filter stack applying first filters to the markdown pages, and later it postprocesses filters to generated HTML content.

I have not tested everything (maybe we work out together some testing framework, e.g. based on jasmine), but it is working at least with commands.

e.g. I am having a simple README.md containing a [[link]] and following vegetables.json:

{
    "tags": {
        "globalTitle": "my site",
        "menu": [
            {
                "uri": "index.html",
                "label": "Homepage"
            }
        ]
    },
    "filterMarkdown": [
        "perl -n -e 's/\\[\\[(.*?)\\|(.*?)\\]\\]/[$1]($2.html)/g;s/\\[\\[(.*?)\\]\\]/[$1]($1.html)/g;print'"
    ]
}

this replaces all [[links]] to [links](links.html).

From design (not yet tested) you could even do:

{
   "filterMarkdown": [
     { 
        "require": "/path/to/file.js"
     },
   ],
   "filterHTML": [
     { 
        "require": "/path/to/file.js"
     }
   ],
}

where file.js is something like:

module.exports = function(opts) {
   if (opts.markdown) {
       var md = opts.markdown;
       return md.replace(/sometext/g, "othertext");
   } else if (opts.html) {
      return opts.html.replace(/foo/g, "bar");
  }
}

So you can use the same function for HTML transformation.

[klorenz]

Do not yet merge this, I am adding some more hooks :)