const pluginWebc = require("@11ty/eleventy-plugin-webc");

module.exports = function(eleventyConfig) {
	eleventyConfig.ignores.add("README.md");

	eleventyConfig.addPlugin(pluginWebc);

	eleventyConfig.addWatchTarget("../src/activitypub-tests/**/*.md")

	eleventyConfig.setServerOptions({
		domDiff: false
	});

	eleventyConfig.addPassthroughCopy({ "../README.md": "README.md" })
	eleventyConfig.addPassthroughCopy({ "../node_modules/markdown-it": "node_modules/markdown-it" })

  // eleventyConfig.setServerPassthroughCopyBehavior("passthrough")

	withMarkdownFilters(eleventyConfig)

  return {}
};

function withMarkdownFilters(eleventyConfig) {
	eleventyConfig.addFilter('withoutMarkdownFrontMatter', withoutMarkdownFrontMatter)
}

/**
 * if the provided markdown has yaml front matter[0], return a version of the markdown that omits it
 * @param markdown 
 * @returns {string}
 */
function withoutMarkdownFrontMatter(markdown) {
  const sections = (markdown ?? '').split('---').map((s => s.trim())).flatMap(s => s ? [s] : [])
  if (sections.length <= 1) return markdown || ''
	// the '\n' preceding is required for <h1> to not get mangled
  const markdownSansFront = ['\n', sections.slice(1).join('---')].join('')
	return markdownSansFront
}