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diff --git a/make-search-index.js b/make-search-index.js
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+
+/*
+ * make-search-index.js
+ *
+ * This converts a "search data" file produced by the haskell site builder into
+ * a lunr.js index and saves it in JSON. Metadata for search (currently titles)
+ * are stored separately in an extra file.
+ *
+ * Installing dependencies:
+ * yarnpkg add lunr
+ *
+ * Usage:
+ * site ....some args.... --search-data-output search-raw.json
+ * node make-search-index.js search-raw.json search-index.json search-meta.json
+ */
+
+lunr = require("lunr")
+fs = require("fs")
+
+if(process.argv.length !== 5) {
+  console.error('Needs exactly 3 arguments (input json, output index).');
+  process.exit(1);
+}
+
+documents = JSON.parse(fs.readFileSync(process.argv[2], {encoding: 'utf8'}))
+
+var idx = lunr(function () {
+  this.ref('link')
+  this.field('title', {boost: 10})
+  this.field('text')
+  documents.forEach(function (doc) {
+    this.add(doc)
+  }, this)
+})
+
+fs.writeFileSync(process.argv[3], JSON.stringify(idx), {encoding: 'utf8'})
+fs.writeFileSync(process.argv[4], JSON.stringify(
+    Object.fromEntries(documents.map(x => [x.link, x.title]))
+  ), {encoding: 'utf8'})