const externalLinks = require("eleventy-plugin-external-links");
const markdownIt = require("markdown-it");

module.exports = (eleventyConfig) => {
    // Format date
    eleventyConfig.addFilter("isoDate", dateObj => dateObj.toISOString().substring(0, 10));

    // Extract excerpts
    eleventyConfig.setFrontMatterParsingOptions({
        excerpt: true,
        excerpt_separator: "<!-- excerpt -->",
    });

    // Make external links go `target="_blank"`
    eleventyConfig.addPlugin(externalLinks, {
        name: "external-links",
        regex: /^(?!https:\/\/.*fwdekker.com|\/.*)/i,
        rel: null,
        includeDoctype: true,
    });

    // Convert string to HTML
    eleventyConfig.addFilter("toHTML", str => new markdownIt({}).renderInline(str));

    return {
        pathPrefix: "/blog/",
        dir: {
            input: "src/main/",
            output: "dist/",
        }
    };
};