index.js

const unified = require('unified');
const markdown = require('remark-parse');
const { select } = require('unist-util-select');

const remarkToChan = require('@geut/remark-chan');
const stringify = require('@geut/chan-stringify');

const {
  initialize: transformerInitialize,
  addChanges: transformerAddChanges,
  addRelease: transformerAddRelease
} = require('./transformer');

const preset = (plugin, opts = {}) => [
  [markdown, remarkToChan, [plugin, opts], stringify],
  { settings: { position: false } }
];

exports.initialize = function initialize(from, opts, cb) {
  return unified()
    .use(...preset(transformerInitialize, opts))
    .process(from, cb);
};

exports.addChanges = function addChanges(from, opts, cb) {
  return unified()
    .use(...preset(transformerAddChanges, opts))
    .process(from, cb);
};

exports.addRelease = function addRelease(from, opts, cb) {
  return unified()
    .use(...preset(transformerAddRelease, opts))
    .process(from, cb);
};

exports.getMarkdownRelease = function getMarkdownRelease(from, { version }) {
  const markdownTree = unified()
    .use(markdown)
    .parse(from);

  const chanTree = remarkToChan()(markdownTree);

  const release = select(`release[identifier=${version}]`, chanTree);
  const compile = new stringify({ withPreface: false });
  return compile.Compiler({ type: 'root', children: [release] }, from);
};