Fixed highlighting of search terms

src/assets/javascripts/modules/search/_/index.ts

@@ -190,7 +190,7 @@ export class Search {
    */
   public search(query: string): SearchResult[] {
     query = query
-      .replace(/(?:^|\s+)[+-:~^]+(?=\s+|$)/g, "")
+      .replace(/(?:^|\s+)[*+-:^~]+(?=\s+|$)/g, "")
       .trim()
 
     /* Abort early, if query is empty */

src/assets/javascripts/modules/search/highlight/index.ts

@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2016-2019 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+import * as escapeRegExp from "escape-string-regexp"
+
+import { SearchIndexConfig } from "../_"
+import { SearchDocument } from "../document"
+
+/* ----------------------------------------------------------------------------
+ * Types
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Search highlight function
+ *
+ * @template T - Search document type
+ *
+ * @param document - Search document
+ *
+ * @return Highlighted document
+ */
+export type SearchHighlightFn =
+  <T extends SearchDocument>(document: Readonly<T>) => T
+
+/**
+ * Search highlight factory function
+ *
+ * @param query - Query string
+ *
+ * @return Search highlight function
+ */
+export type SearchHighlightFactoryFn =
+  (query: string) => SearchHighlightFn
+
+/* ----------------------------------------------------------------------------
+ * Functions
+ * ------------------------------------------------------------------------- */
+
+/**
+ * Create a search highlighter
+ *
+ * @param config - Search index configuration
+ *
+ * @return Search highlight function
+ */
+export function setupSearchHighlighter(
+  config: SearchIndexConfig
+): SearchHighlightFactoryFn {
+  const separator = new RegExp(config.separator, "img")
+  const highlight = (_: unknown, data: string, term: string) => {
+    return `${data}<em>${term}</em>`
+  }
+
+  /* Return factory function */
+  return (query: string) => {
+    query = query
+      .replace(/[\s*+-:~^]+/g, " ")
+      .trim()
+
+    /* Create search term match expression */
+    const match = new RegExp(`(^|${config.separator})(${
+      escapeRegExp(query).replace(separator, "|")
+    })`, "img")
+
+    /* Highlight document */
+    return document => ({
+      ...document,
+      title: document.title.replace(match, highlight),
+      text:  document.text.replace(match, highlight)
+    })
+  }
+}