Feature Request: Interpolated YAML Variables

[ghost]

Overview

I'd like to associate a YAML file with one or more Markdown documents such that before a Markdown document is converted to HTML, its variable references are first replaced with the definitions from the YAML file.

Interpolated Strings

For the interpolated string values, please see:

• Feature request: use variables in document body text jgm/pandoc#1950 (comment)
• https://dave.autonoma.ca/blog/2019/07/06/typesetting-markdown-part-5/#yaml-and-markdown-separation
• https://bitbucket.org/djarvis/yamlp/src/master/src/main/java/com/whitemagicsoftware/yamlp/parser/YamlParser.java#lines-242 (sample algorithm)

Examples

Consider the following files:

• /user/pages/01.blog/01.typesetting-markdown/definitions.yaml
• /user/pages/01.blog/01.typesetting-markdown/item.md

In /user/pages/01.blog/01.typesetting-markdown/definitions.yaml:

author:
  name:
    first: Jane
    last: Doe
    full: $author.name.first$ $author.name.last$

In /user/pages/01.blog/01.typesetting-markdown/item.md:

You've reached the blog of $author.name.full$! But, please, call me $author.name.first$.

Produces:

<p>
You've reached the blog of Jane Doe! But, please, call me Jane.
</p>

This could also allow for globally defined page references:

[link]($site.blog.home$/$site.main.filename$.md)

Where:

site:
  blog:
    home: /blog
  main:
    filename: item