Add 404 page, feed, and service worker configuration; include MathJax and search data

Author: js-surya

assets/.DS_Store

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+---
+layout: page
+title: "404: Page not found"
+permalink: /404.html
+
+redirect_from:
+  - /norobots/
+  - /assets/
+  - /posts/
+---
+
+{% include lang.html %}
+
+<p class="lead">{{ site.data.locales[lang].not_found.statement }}</p>

assets/404.html

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+---
+---
+
+@use 'main
+{%- if jekyll.environment == 'production' -%}
+  .bundle
+{%- endif -%}
+';
+
+/* append your custom style below */

assets/css/jekyll-theme-chirpy.scss

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+---
+layout: compress
+permalink: /feed.xml
+# Atom Feed, reference: https://validator.w3.org/feed/docs/atom.html
+---
+
+{% capture source %}
+<feed xmlns="http://www.w3.org/2005/Atom">
+  <id>{{ "/" | absolute_url }}</id>
+  <title>{{ site.title }}</title>
+  <subtitle>{{ site.description }}</subtitle>
+  <updated>{{ site.time | date_to_xmlschema }}</updated>
+  <author>
+    <name>{{ site.social.name }}</name>
+    <uri>{{ "/" | absolute_url }}</uri>
+  </author>
+  <link rel="self" type="application/atom+xml" href="{{ page.url | absolute_url }}"/>
+  <link rel="alternate" type="text/html" hreflang="{{ site.alt_lang | default: site.lang }}"
+    href="{{ '/' | absolute_url }}"/>
+  <generator uri="https://jekyllrb.com/" version="{{ jekyll.version }}">Jekyll</generator>
+  <rights> © {{ 'now' | date: '%Y' }} {{ site.social.name }} </rights>
+  <icon>{{ site.baseurl }}/assets/img/favicons/favicon.ico</icon>
+  <logo>{{ site.baseurl }}/assets/img/favicons/favicon-96x96.png</logo>
+
+{% for post in site.posts limit: 5 %}
+  {% assign post_absolute_url = post.url | absolute_url %}
+  <entry>
+    <title>{{ post.title }}</title>
+    <link href="{{ post_absolute_url }}" rel="alternate" type="text/html" title="{{ post.title | xml_escape }}" />
+    <published>{{ post.date | date_to_xmlschema }}</published>
+  {% if post.last_modified_at %}
+    <updated>{{ post.last_modified_at | date_to_xmlschema }}</updated>
+  {% else %}
+    <updated>{{ post.date | date_to_xmlschema }}</updated>
+  {% endif %}
+    <id>{{ post_absolute_url }}</id>
+    <content type="text/html" src="{{ post_absolute_url }}" />
+    <author>
+      <name>{{ post.author | default: site.social.name }}</name>
+    </author>
+
+  {% if post.categories %}
+    {% for category in post.categories %}
+    <category term="{{ category }}" />
+    {% endfor %}
+  {% endif %}
+
+  <summary>{% include post-description.html max_length=400 %}</summary>
+
+  </entry>
+{% endfor %}
+</feed>
+{% endcapture %}
+{{ source | replace: '&', '&amp;' }}

assets/feed.xml

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+---
+layout: compress
+# WARNING: Don't use '//' to comment out code, use '{% comment %}' and '{% endcomment %}' instead.
+---
+
+{%- comment -%}
+  See: <https://docs.mathjax.org/en/latest/options/input/tex.html#tex-options>
+{%- endcomment -%}
+
+MathJax = {
+  tex: {
+    {%- comment -%} start/end delimiter pairs for in-line math {%- endcomment -%}
+    inlineMath: [
+      ['$', '$'],
+      ['\\(', '\\)']
+    ],
+    {%- comment -%} start/end delimiter pairs for display math {%- endcomment -%}
+    displayMath: [
+      ['$$', '$$'],
+      ['\\[', '\\]']
+    ],
+    {%- comment -%} equation numbering {%- endcomment -%}
+    tags: 'ams'
+  }
+};

assets/js/.DS_Store

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+---
+layout: compress
+swcache: true
+---
+
+[
+  {% for post in site.posts %}
+  {
+    "title": {{ post.title | jsonify }},
+    "url": {{ post.url | relative_url | jsonify }},
+    "categories": {{ post.categories | join: ', ' | jsonify }},
+    "tags": {{ post.tags | join: ', ' | jsonify }},
+    "date": "{{ post.date }}",
+    {% include no-linenos.html content=post.content %}
+    {% assign _content = content | strip_html | strip_newlines %}
+    "snippet": {{ _content | truncate: 200 | jsonify }},
+    "content": {{ _content | jsonify }}
+  }{% unless forloop.last %},{% endunless %}
+  {% endfor %}
+]

assets/js/data/mathjax.js

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+---
+layout: compress
+permalink: '/:path/swconf.js'
+# Note that this file will be fetched by the ServiceWorker, so it will not be cached.
+---
+
+const swconf = {
+  {% if site.pwa.cache.enabled %}
+    cacheName: 'chirpy-{{ "now" | date: "%s" }}',
+
+    {%- comment -%} Resources added to the cache during PWA installation. {%- endcomment -%}
+    resources: [
+      '{{ "/assets/css/:THEME.css" | replace: ':THEME', site.theme | relative_url }}',
+      '{{ "/" | relative_url }}',
+      {% for tab in site.tabs %}
+        '{{- tab.url | relative_url -}}',
+      {% endfor %}
+
+      {% assign cache_list = site.static_files | where: 'swcache', true %}
+      {% for file in cache_list %}
+        '{{ file.path | relative_url }}'{%- unless forloop.last -%},{%- endunless -%}
+      {% endfor %}
+    ],
+
+    interceptor: {
+      {%- comment -%} URLs containing the following paths will not be cached. {%- endcomment -%}
+      paths: [
+        {% for path in site.pwa.cache.deny_paths %}
+          {% unless path == empty %}
+            '{{ path | relative_url }}'{%- unless forloop.last -%},{%- endunless -%}
+          {% endunless  %}
+        {% endfor %}
+      ],
+
+      {%- comment -%} URLs containing the following prefixes will not be cached. {%- endcomment -%}
+      urlPrefixes: [
+        {% if site.analytics.goatcounter.id != nil and site.pageviews.provider == 'goatcounter' %}
+          'https://{{ site.analytics.goatcounter.id }}.goatcounter.com/counter/'
+        {% endif %}
+      ]
+    },
+
+    purge: false
+  {% else %}
+    purge: true
+  {% endif %}
+};

assets/js/data/search.json

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+---
+permalink: /robots.txt
+# The robots rules
+---
+
+User-agent: *
+
+Disallow: /norobots/
+
+Sitemap: {{ '/sitemap.xml' | absolute_url }}