feat: make post description customizable (cotes2020#1602)

---------

Co-authored-by: Cotes Chung <11371340+cotes2020@users.noreply.github.com>

_data/origin/cors.yml

@@ -13,7 +13,7 @@ cdns:
 
 # fonts
 
-webfonts: https://fonts.googleapis.com/css2?family=Lato&family=Source+Sans+Pro:wght@400;600;700;900&display=swap
+webfonts: https://fonts.googleapis.com/css2?family=Lato:wght@300;400&family=Source+Sans+Pro:wght@400;600;700;900&display=swap
 
 # Libraries
 

_includes/post-description.html

@@ -0,0 +1,16 @@
+{%- comment -%}
+  Get post description or generate it from the post content.
+{%- endcomment -%}
+
+{%- assign max_length = include.max_length | default: 200 -%}
+
+{%- capture description -%}
+{%- if post.description -%}
+  {{- post.description -}}
+{%- else -%}
+  {%- include no-linenos.html content=post.content -%}
+  {{- content | markdownify | strip_html -}}
+{%- endif -%}
+{%- endcapture -%}
+
+{{- description | strip | truncate: max_length | escape -}}

_includes/related-posts.html

@@ -81,10 +81,7 @@ <h3 class="mb-4" id="related-label">
               {% include datetime.html date=post.date lang=include.lang %}
               <h4 class="pt-0 my-2">{{ post.title }}</h4>
               <div class="text-muted">
-                <p>
-                  {% include no-linenos.html content=post.content %}
-                  {{ content | markdownify | strip_html | truncate: 200 | escape }}
-                </p>
+                <p>{% include post-description.html %}</p>
               </div>
             </div>
           </a>

_layouts/home.html

@@ -72,10 +72,7 @@
             <h1 class="card-title my-2 mt-md-0">{{ post.title }}</h1>
 
             <div class="card-text content mt-0 mb-3">
-              <p>
-                {% include no-linenos.html content=post.content %}
-                {{ content | markdownify | strip_html | truncate: 200 | escape }}
-              </p>
+              <p>{% include post-description.html %}</p>
             </div>
 
             <div class="post-meta flex-grow-1 d-flex align-items-end">

_layouts/post.html

@@ -14,6 +14,9 @@
 <article class="px-1">
   <header>
     <h1 data-toc-skip>{{ page.title }}</h1>
+    {% if page.description %}
+      <p class="post-desc fw-light mb-4">{{ page.description }}</p>
+    {% endif %}
 
     <div class="post-meta text-muted">
       <!-- published date -->

_posts/2019-08-08-text-and-typography.md

@@ -1,5 +1,6 @@
 ---
 title: Text and Typography
+description: Examples of text, typography, math equations, diagrams, flowcharts, pictures, videos, and more.
 author: cotes
 date: 2019-08-08 11:33:00 +0800
 categories: [Blogging, Demo]
@@ -13,8 +14,6 @@ image:
   alt: Responsive rendering of Chirpy theme on multiple devices.
 ---
 
-This post is to show Markdown syntax rendering on [**Chirpy**](https://github.com/cotes2020/jekyll-theme-chirpy/fork), you can also use it as an example of writing. Now, let's start looking at text and typography.
-
 ## Headings
 
 <!-- markdownlint-capture -->

_posts/2019-08-08-write-a-new-post.md

@@ -73,6 +73,18 @@ Having said that, the key `author` can also identify multiple entries.
 > The benefit of reading the author information from the file `_data/authors.yml`{: .filepath } is that the page will have the meta tag `twitter:creator`, which enriches the [Twitter Cards](https://developer.twitter.com/en/docs/twitter-for-websites/cards/guides/getting-started#card-and-content-attribution) and is good for SEO.
 {: .prompt-info }
 
+### Post Description
+
+By default, the first words of the post are used to display on the home page for a list of posts, in the _Further Reading_ section, and in the XML of the RSS feed. If you don't want to display the auto-generated description for the post, you can customize it using the `description` field in the _Front Matter_ as follows:
+
+```yaml
+---
+description: Short summary of the post.
+---
+```
+
+Additionally, the `description` text will also be displayed under the post title on the post's page.
+
 ## Table of Contents
 
 By default, the **T**able **o**f **C**ontents (TOC) is displayed on the right panel of the post. If you want to turn it off globally, go to `_config.yml`{: .filepath} and set the value of variable `toc` to `false`. If you want to turn off TOC for a specific post, add the following to the post's [Front Matter](https://jekyllrb.com/docs/front-matter/):

_posts/2019-08-09-getting-started.md

@@ -1,5 +1,8 @@
 ---
 title: Getting Started
+description: >-
+  Get started with Chirpy basics in this comprehensive overview.
+  You will learn how to install, configure, and use your first Chirpy-based website, as well as deploy it to a web server.
 author: cotes
 date: 2019-08-09 20:55:00 +0800
 categories: [Blogging, Tutorial]

_sass/layout/post.scss

@@ -14,19 +14,28 @@
   padding-right: $pr;
 }
 
-h1 + .post-meta {
-  span + span::before {
-    @include dot;
-  }
+header {
+  .post-desc {
+    @extend %heading;
 
-  em,
-  time {
-    @extend %text-highlight;
+    font-size: 1.125rem;
+    line-height: 1.6;
   }
 
-  em {
-    a {
-      color: inherit;
+  .post-meta {
+    span + span::before {
+      @include dot;
+    }
+
+    em,
+    time {
+      @extend %text-highlight;
+    }
+
+    em {
+      a {
+        color: inherit;
+      }
     }
   }
 }

assets/feed.xml

@@ -45,14 +45,7 @@ permalink: /feed.xml
     {% endfor %}
   {% endif %}
 
-  {% if post.summary %}
-    <summary>{{ post.summary | strip }}</summary>
-  {% else %}
-    <summary>
-      {% include no-linenos.html content=post.content %}
-      {{ content  | strip_html | truncate: 400 }}
-    </summary>
-  {% endif %}
+  <summary>{% include post-description.html max_length=400 %}</summary>
 
   </entry>
 {% endfor %}