Tag support

[Pinjasaur]

A major feature that would be worth considering support for would be arbitrary tags to help categorize posts.

High level scope:

• Determine the syntax to be used within the markdown document i.e. tags: tag1, tag2, tag3
• What URL structure for the index of tags along with all the documents tagged something i.e. /tags and either /tags/{tag} or /tagged/{tag}
• Roughly how the data structure would look internally to track tags to their source documents. Will certainly be janky because Bash doesn't make that trivial.

An initial proposal of a hypothetical markdown document:

# My title
tags: foo, bar, baz

Here are some words.

Lorem ipsum.

I'm partial to /tags and /tags/{tag} since it's more of a RESTful syntax.

Open questions:

• How to parse tags?
  • Split on commas, trim whitespace? Do we trim all whitespace? And lowercase?

[Pinjasaur]

cc @mfossen thoughts?

[Pinjasaur]

Going through some old notes I found some thoughts I had jotted down. Added a few more, too. But, I think technically speaking, this can be implemented using a declare -A ALL_TAGS to create an associative array data structure containing the tags as keys e.g. mytag and the values as a delimited string of posts e.g. posts/foo.md:posts/bar.md.

[Pinjasaur]

mo's @key support could be handy e.g. mapping a tag to a slug https://github.com/tests-always-included/mo#loop-key

[Pinjasaur]

I'm also considering using the relatively common YAML frontmatter, e.g.

---
tags: foo, bar, baz
---
# My Title

Words and stuff.

cc @mfossen