const unified = require('unified')
const stream = require('unified-stream')
const markdown = require('remark-parse')
const remark2rehype = require('remark-rehype')
const html = require('rehype-stringify')

// the rehype transform
const codeblocks = require('@code-blocks/rehype-transform')

// some renderers
const charts = require('@code-blocks/charts')
const graphviz = require('@code-blocks/graphviz')

const processor = unified()
  .use(markdown)
  .use(remark2rehype)
  // add the transform and the renderers in an array as options
  .use(codeblocks, [charts, graphviz])
  .use(html)

process.stdin.pipe(stream(processor)).pipe(process.stdout)

// the plugin
const codeblocks = require('@code-blocks/eleventy-plugin')

// some renderers
const math = require('@code-blocks/math')
const music = require('@code-blocks/music')

module.exports = function(eleventyConfig) {
  // pass the renderers to the plugin
  eleventyConfig.addPlugin(codeblocks([
    math,
    music,
  ]))
}