.eleventy.js

module.exports = function(eleventyConfig) {

    // static passthroughs - remap to root
    eleventyConfig.addPassthroughCopy({ "assets/images/icons/fav/favicon.ico": "/favicon.ico" });
    eleventyConfig.addPassthroughCopy({ "assets/images/icons/fav/manifest.json": "/manifest.json" });
    eleventyConfig.addPassthroughCopy({ "assets/scripts/service-worker.js": "/service-worker.js" });

    eleventyConfig.addPassthroughCopy("assets/images");
    eleventyConfig.addPassthroughCopy("assets/scripts");
    eleventyConfig.addPassthroughCopy("assets/styles");
    eleventyConfig.addPassthroughCopy("admin");

    // grab 3rd party dependencies
    eleventyConfig.addPassthroughCopy({ "node_modules/mark.js/dist/mark.min.js": "/vendor/scripts/mark.js" });
    eleventyConfig.addPassthroughCopy({ "node_modules/gumshoejs/dist/gumshoe.polyfills.min.js": "/vendor/scripts/gumshoe.js" });
    eleventyConfig.addPassthroughCopy({ "node_modules/highlightjs/styles": "/vendor/styles/hljs" });
    eleventyConfig.addPassthroughCopy({ "node_modules/firacode/distr/woff": "/assets/fonts/" });
    eleventyConfig.addPassthroughCopy({ "node_modules/firacode/distr/woff2/": "/assets/fonts/" });
    eleventyConfig.addPassthroughCopy({ "node_modules/typeface-noto-serif/files": "/assets/fonts/" });
    eleventyConfig.addPassthroughCopy({ "node_modules/typeface-roboto/files": "/assets/fonts/" });

    // add filters
    eleventyConfig.addFilter("cssmin", require("./plugins/clean-css.js"));
    eleventyConfig.addFilter("jsmin", require("./plugins/clean-js.js"));
    eleventyConfig.addFilter("dateDisplay", require("./plugins/dates.js"));
    eleventyConfig.addFilter("removeHash", html => html.replace(/ #/g, ""));
    eleventyConfig.addFilter("removeParen", html => html.replace(/\(.*?\)/g, ""));
    eleventyConfig.addFilter("lastDir", str => str.split("/").pop());
    eleventyConfig.addFilter("contentTags", tags => tags.filter(t => !["post", "draft"].includes(t)));
    eleventyConfig.addFilter("findByName", (arr, findValue) => arr.find(a => a.name === findValue));
    eleventyConfig.addFilter("isPostType", tags => tags && tags.some(t => ["post", "draft"].includes(t)));
    eleventyConfig.addFilter("isDraft", tags => tags && tags.some(t => t === 'draft'));
    eleventyConfig.addFilter("take", (array, n) => array.slice(0, n));
    eleventyConfig.addFilter("sortByPostCount", arr => arr.sort((a, b) => (a.posts.length < b.posts.length ? 1 : -1)));


    // custom collections
    let builder = require("./plugins/builder.js")
    eleventyConfig.addCollection("authors", col => builder(col, "author", "name", "summary", "authors", "./pages/authors/"));
    eleventyConfig.addCollection("projects", col => builder(col, "project", "name", "summary", "project", "./pages/projects/"));
    eleventyConfig.addCollection("teams", col => builder(col, "team", "name", "summary", "team", "./pages/teams/"));
    eleventyConfig.addCollection("departments", col => builder(col, "department", "name", "summary", "department", "./pages/departments/"));

    eleventyConfig.addCollection("slides", col => {
        let presentations = col.getFilteredByTag("presentation")

        let allSlides = presentations.map(pres => {
            let content = pres.template.frontMatter.content
            let pages = content.split(/\r?\n---\r?\n/)

            // add metadata to slides level
            let slides = pages.map((page, i) => {
                let slide = {
                    href: `/slides/${pres.fileSlug}/${i + 1}/`,
                    pres: {
                        title: pres.data.title,
                        summary: pres.data.summary,
                        totalPages: pages.length,
                        fileSlug: pres.fileSlug
                    },
                    cur: {
                        content: page,
                        html: md.render(page),
                        curPage: i + 1,
                        perComplete: `${Math.round(((i + 1) / pages.length) * 100)}%`
                    }
                }

                return slide
            })


            // add previous and next
            for (let i = 0; i < slides.length; i++) {
                const prev = slides[i - 1];
                const next = slides[i + 1];

                slides[i].prev = prev;
                slides[i].next = next;
            }

            return slides
        })

        // flat map all slides
        let flatSlides = allSlides.reduce((a, b) => a.concat(b), []);

        return flatSlides
    });


    eleventyConfig.addCollection("drafts", col => col.getFilteredByTag("post").filter(item => item.data.draft));
    eleventyConfig.addCollection("published", col => {
        let posts = col.getFilteredByTag("post").filter(item => !item.data.draft)

        // add previous and next
        for (let i = 0; i < posts.length; i++) {
            const prevPost = posts[i - 1];
            const nextPost = posts[i + 1];

            posts[i].data.prevPost = prevPost;
            posts[i].data.nextPost = nextPost;
        }

        return posts;
    });

    // bundle collection
    eleventyConfig.addCollection("bundles", col => {
        let script = col.getFilteredByGlob("**/meta/bundle-scripts.js.njk")[0]
        let style = col.getFilteredByGlob("**/meta/bundle-styles.css.njk")[0]
        return { script, style }
    });

    // configure syntax highlighting
    let md = require("./plugins/customize-markdown.js")()
    eleventyConfig.setLibrary("md", md);

    eleventyConfig.addShortcode("year", () => `${new Date().getFullYear()}`);

    eleventyConfig.addPairedShortcode("markdown", (content, inline = null) => {
        return inline
          ? md.renderInline(content)
          : md.render(content);
    });

    // add plugins
    let pluginTOC = require('eleventy-plugin-nesting-toc');
    eleventyConfig.addPlugin(pluginTOC, { tags: ['h2, h3'] });

    /* embed tweet plugin setup */
    let pluginEmbedTweet = require("eleventy-plugin-embed-tweet")
    let tweetEmbedOptions = {
        cacheDirectory: 'tweets',
        useInlineStyles: false
    }
    eleventyConfig.addPlugin(pluginEmbedTweet, tweetEmbedOptions);

    return {
        dir: {
            "data": "data",
            "includes": "assets",
            "layouts": "layouts"
        },

        // By default markdown files are pre-processing with liquid template engine
        // https://www.11ty.io/docs/config/#default-template-engine-for-markdown-files
        markdownTemplateEngine: "njk",
    };
};