Gruntfile.js

var yaml = require("js-yaml");
var S = require("string");

var CONTENT_PATH_PREFIX = "content/";

module.exports = function(grunt) {

    grunt.registerTask("lunr-index", function() {

        grunt.log.writeln("Build pages index");

        var indexPages = function() {
            var pagesIndex = [];
            grunt.file.recurse(CONTENT_PATH_PREFIX, function(abspath, rootdir, subdir, filename) {

                grunt.verbose.writeln("Parse file:",abspath);
                pagesIndex.push(processFile(abspath, filename));
            });

            return pagesIndex;
        };

        var processFile = function(abspath, filename) {
            var pageIndex;

            if (S(filename).endsWith(".md")) {
                pageIndex = processMDFile(abspath, filename);
            }

            return pageIndex;
        };

        var processMDFile = function(abspath, filename) {
            var content = grunt.file.read(abspath);
            var pageIndex;
            // First separate the Front Matter from the content and parse it
            content = content.split("---");
            var frontMatter;
            try {
                frontMatter = yaml.safeLoad(content[1].trim());
            } catch (e) {
                console.log(e.message);
            }

            var href = S(abspath).chompLeft(CONTENT_PATH_PREFIX).chompRight(".md").s;
	    console.log(href);

            // href for index.md files stops at the folder name
            if (filename === "_index.md") {
                href = S(abspath).chompLeft(CONTENT_PATH_PREFIX).chompRight(filename).s;
            }

            // Build Lunr index for this page
            pageIndex = {
                title: frontMatter.title,
                tags: frontMatter.tags,
                href: href,
                content: S(content[2]).trim().stripTags().stripPunctuation().s
            };

            return pageIndex;
        };

        grunt.file.write("./static/js/lunr/PagesIndex.json", "var data = " + JSON.stringify(indexPages()));
        grunt.log.ok("Index built");
    });
};