Config object for definitions

[stevenvachon]

I think it'd be nice for the abbreviations and their expanded forms to be defined where the plugin is use()'d as to avoid the complication of handling transclusion per file.

[stevenvachon]

I wrote this for now:

// MarkdownItInjectContent
export default (md, { content, prepend = false } = {}) => {
  md.core.ruler.before('normalize', 'inject_content', (state) => {
    if (prepend) {
      state.src = `${content}\n\n${state.src}`;
    } else {
      state.src = `${state.src}\n\n${content}`;
    }
    // Avoid strange errors with npmjs.com/markdown-it-abbr
    if (!state.env) {
      state.env = {};
    }
    if (!state.env.references) {
      state.env.references = {};
    }
    return true;
  });
};

// Must be before `MarkdownItAbbr`
mdLib.use(MarkdownItInjectContent, {
  // Could obviously use `await fs.readFile` here
  content: '*[HTML]: HyperText Markup Language',
});

[stevenvachon]

The above code did work in isolation, but has issues when integrating with markdown-it-implicit-figures, so I forked this project to include this issue's request and a fix for #10.