FR Produce valid metadata yaml

[blaggacao]

There might be a better alternative to the current DSL for the metadata

---
Categories:
 - foo
Tags:
 - bar
Created: ...
---

Title 
===

Benefits:

• metadata is always good
  • eg. render a html static page with all notes classified according to metadata (like a blog post with tags and categories)

Cons:

• (simple) migration needed

Would solve #4

[rhysd]

I avoided YAML front matter because it is not a part of markdown (see commonmark spec to know the spec of markdown). It's original extension of some markdown implementation. Some markdown parser does not implement it.

[blaggacao]

I understand and agree, on the other hand, this is still completely valid markdown:

---          (horizontal rule)
Categories:  (normal word)
 - foo       (bullet point list)
Tags:        (normal word)
 - bar       (bullet point list)
Created: ... (normal word)
---          (horizontal rule)

So maybe even by the measures of the spec compliance, this is just an alternative way to store metadata which happens to also be parseable form a (quite) wide variety of markdown enhancing tools.