blog 2021 final update

* a post about it
* new: steam, wikipedia tags
* new: enable post asset folders and automatically used as the post root

scripts/wikipedia.js

@@ -0,0 +1,48 @@
+
+function buildArgsHash(args) {
+    let argsHash = {};
+    args.forEach(arg => {
+        const params = arg.split(':');
+        argsHash[params[0]] = params[1];
+    });
+
+    return argsHash;
+}
+
+function generateWikipediaTagHtml(args, content) {
+    const argsHash = buildArgsHash(args);
+    const title = argsHash['title'];
+
+    const lang = argsHash['lang'] !== undefined ? argsHash['lang'] : 'en';
+    const baseUrl = `https://${lang}.wikipedia.org`;
+
+    const url = `${baseUrl}/api/rest_v1/page/summary/${title}?redirect=false`;
+
+    const tagId = Math.round(Math.random() * 100000);
+    const embeddedScript = `
+      window.addEventListener('load', function() {
+        var element = document.getElementById('${tagId}');
+        var req = new XMLHttpRequest();
+        req.addEventListener("load", function() {
+          var result = this.response;
+          const extract = result.extract;
+          element.prepend(extract);
+        });
+        req.addEventListener("error", function() {
+          element.prepend('Failed to fetch wikipedia data for "${title}".');
+        });
+        req.open('GET', '${url}');
+        req.responseType = 'json';
+        req.setRequestHeader('accept', 'application/json; charset=utf-8; profile="https://www.mediawiki.org/wiki/Specs/Summary/1.4.2"');
+        req.send();
+      });
+    `;
+    let contentText = `<script>${embeddedScript}</script>`;
+    if (argsHash['wikiButton'] === 'true') {
+        contentText += `<p><a href="${baseUrl}/wiki/${title}">Wikipedia:${title}</a></p>`;
+    }
+
+    return `<blockquote id='${tagId}'>${contentText}</blockquote>`;
+}
+
+hexo.extend.tag.register('wikipedia', generateWikipediaTagHtml);