Bump version to 3.1.0

- drop the deprecated flag `--deployment` of bundle (so we have to specify the bundler caching path)

.github/workflows/issue-pr-interceptor.yml

@@ -16,5 +16,5 @@ jobs:
         repo-token: ${{ secrets.GITHUB_TOKEN }}
         issue-pattern: "\\[x\\] I have read"
         issue-close-message: ":wave: Hi @${issue.user.login},\n\nThis issue is being automatically closed because it does not follow the issue template."
-        pr-pattern: "\\[x\\] Bug|\\[x\\] New feat|\\[x\\] Break|\\[x\\] Doc"
+        pr-pattern: "\\[x\\] Bug|\\[x\\] New feat|\\[x\\] Break|\\[x\\] Doc|@dependabot"
         pr-close-message: ":wave: Hi @${pull_request.user.login},\n\nThis PR is being automatically closed because it does not follow the PR template."

.gitignore

@@ -5,3 +5,12 @@
 # jekyll cache
 _site
 vendor
+
+# rubygem
+*.gem
+# yard docs
+doc
+
+# npm dependencies
+node_modules
+package-lock.json

.travis.yml

@@ -4,19 +4,29 @@ dist: bionic
 language: ruby
 rvm: 2.7.0
 
-cache: bundler
+cache:
+  directories:
+    - $TRAVIS_BUILD_DIR/vendor/bundle
+
+before_install:
+  - gem install bundler:2.2.4   # match the Gemfile.lock, travis' bundle is 2.1.2
+  - bundle config path 'vendor/bundle'
+
+install:
+  # overriding to drop the travis `--development` flag
+  - bundle install --jobs=3 --retry=3
 
 addons:
   apt:
     packages:
-      - libcurl4-openssl-dev # required to avoid SSL error (for htmlproofer)
+      - libcurl4-openssl-dev  # required to avoid SSL error (for htmlproofer)
 
 script:
   - git -C "$HOME" clone "$BUILDER_REPO" --depth=1 -q
   - eval "$BUILD_CMD"
 
 branches:
-  only: production
+  only: /.*-stable$/
 
 git:
   depth: false # for posts lastmod

404.html

@@ -1,19 +1,11 @@
 ---
-# The 404 page
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT License
 layout: page
 title: "404: Page not found"
 permalink: /404.html
 
-redirect_from:  # part of site.sitemap_exclude
+redirect_from:
   - /norobots/
   - /assets/
-  - /tabs/
-  - /categories/
-  - /tags/
   - /posts/
 
 dynamic_title: true
@@ -21,5 +13,9 @@ dynamic_title: true
 
 <div class="lead">
   <p>Sorry, we've misplaced that URL or it's pointing to something that doesn't exist. </p>
-  <p><a href="{{ site.baseurl }}/">Head back Home</a> to try finding it again, or search for it on the <a href="{{ site.baseurl }}/tabs/archives">Archives page</a>.</p>
+  <p>
-</div>
+    <a href="{{ '/' | relative_url }}">Head back Home</a>
+    to try finding it again, or search for it on the
+    <a href="{{ 'archives' | relative_url }}">Archives page</a>.
+  </p>
+</div>

Gemfile

@@ -1,18 +1,11 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
-gem "jekyll", ">= 4.1.0", "< 5.0"
+gemspec
-
-# plugins
-group :jekyll_plugins do
-  gem "jekyll-paginate"
-  gem "jekyll-redirect-from"
-  gem "jekyll-seo-tag"
-  gem "jekyll-archives"
-  gem "jekyll-sitemap"
-end
 
 group :test do
-  gem "html-proofer"
+  gem "html-proofer", "~> 3.18"
 end
 
 # Windows and JRuby does not include zoneinfo files, so bundle the tzinfo-data gem

Gemfile.lock

@@ -1,10 +1,21 @@
+PATH
+  remote: .
+  specs:
+    jekyll-theme-chirpy (3.0.3)
+      jekyll (~> 4.1)
+      jekyll-archives (~> 2.2)
+      jekyll-paginate (~> 1.1)
+      jekyll-redirect-from (~> 0.16)
+      jekyll-seo-tag (~> 2.7)
+      jekyll-sitemap (~> 1.4)
+
 GEM
   remote: https://rubygems.org/
   specs:
     addressable (2.7.0)
       public_suffix (>= 2.0.2, < 5.0)
     colorator (1.1.0)
-    concurrent-ruby (1.1.7)
+    concurrent-ruby (1.1.8)
     em-websocket (0.5.2)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
@@ -13,7 +24,7 @@ GEM
     eventmachine (1.2.7)
     ffi (1.14.2)
     forwardable-extended (2.6.0)
-    html-proofer (3.18.3)
+    html-proofer (3.18.5)
       addressable (~> 2.3)
       mercenary (~> 0.3)
       nokogumbo (~> 2.0)
@@ -22,7 +33,7 @@ GEM
       typhoeus (~> 1.3)
       yell (~> 2.0)
     http_parser.rb (0.6.0)
-    i18n (1.8.5)
+    i18n (1.8.7)
       concurrent-ruby (~> 1.0)
     jekyll (4.2.0)
       addressable (~> 2.4)
@@ -57,19 +68,19 @@ GEM
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     liquid (4.0.3)
-    listen (3.3.3)
+    listen (3.4.1)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.4.0)
-    mini_portile2 (2.4.0)
+    nokogiri (1.11.1-x86_64-darwin)
-    nokogiri (1.10.10)
+      racc (~> 1.4)
-      mini_portile2 (~> 2.4.0)
     nokogumbo (2.0.4)
       nokogiri (~> 1.8, >= 1.8.4)
     parallel (1.20.1)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (4.0.6)
+    racc (1.5.2)
     rainbow (3.0.0)
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
@@ -86,26 +97,21 @@ GEM
       ethon (>= 0.9.0)
     tzinfo (1.2.9)
       thread_safe (~> 0.1)
-    tzinfo-data (1.2020.6)
+    tzinfo-data (1.2021.1)
       tzinfo (>= 1.0.0)
     unicode-display_width (1.7.0)
     wdm (0.1.1)
     yell (2.2.2)
 
 PLATFORMS
-  ruby
+  x86_64-darwin-20
 
 DEPENDENCIES
-  html-proofer
+  html-proofer (~> 3.18)
-  jekyll (>= 4.1.0, < 5.0)
+  jekyll-theme-chirpy!
-  jekyll-archives
-  jekyll-paginate
-  jekyll-redirect-from
-  jekyll-seo-tag
-  jekyll-sitemap
   tzinfo (~> 1.2)
   tzinfo-data
   wdm (~> 0.1.1)
 
 BUNDLED WITH
-   2.1.4
+   2.2.4

README.md

@@ -1,21 +1,24 @@
 # Chirpy
 
-Language: English | [简体中文](docs/README.zh-CN.md)
+Language: English | [简体中文](https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/docs/README.zh-CN.md)
 
+[![Gem Version](https://img.shields.io/gem/v/jekyll-theme-chirpy?color=brightgreen)](https://rubygems.org/gems/jekyll-theme-chirpy)
 [![Build Status](https://github.com/cotes2020/jekyll-theme-chirpy/workflows/build/badge.svg?branch=master&event=push)](https://github.com/cotes2020/jekyll-theme-chirpy/actions?query=branch%3Amaster+event%3Apush)
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/8220b926db514f13afc3f02b7f884f4b)](https://app.codacy.com/manual/cotes2020/jekyll-theme-chirpy?utm_source=github.com&utm_medium=referral&utm_content=cotes2020/jekyll-theme-chirpy&utm_campaign=Badge_Grade_Dashboard)
-[![GitHub license](https://img.shields.io/github/license/cotes2020/jekyll-theme-chirpy.svg)](https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/LICENSE)
+[![GitHub license](https://img.shields.io/github/license/cotes2020/jekyll-theme-chirpy.svg?color=blue)](https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/LICENSE)
 [![996.icu](https://img.shields.io/badge/link-996.icu-%23FF4D5B.svg)](https://996.icu)
 
 A minimal, sidebar, responsive web design Jekyll theme that focuses on text presentation. Designed to help you record and share your knowledge easily. [Live Demo »](https://chirpy.cotes.info)
 
-[![Devices Mockup](https://raw.githubusercontent.com/cotes2020/jekyll-theme-chirpy/master/assets/img/sample/devices-mockup.png)](https://chirpy.cotes.info)
+[![Devices Mockup](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/commons/devices-mockup.png)](https://chirpy.cotes.info)
 
 ## Table of Contents
 
 - [Features](#features)
+- [Prerequisites](#prerequisites)
 - [Installation](#installation)
 - [Usage](#usage)
+- [Documentation](#documentation)
 - [Contributing](#contributing)
 - [Credits](#credits)
 - [Supporting](#supporting)
@@ -39,50 +42,68 @@ A minimal, sidebar, responsive web design Jekyll theme that focuses on text pres
 - GA Pageviews reporting (Advanced)
 - SEO and Performance Optimization
 
+## Prerequisites
+
+Follow the [Jekyll Docs](https://jekyllrb.com/docs/installation/) to complete the installation of `Ruby`, `RubyGems`, `Jekyll` and `Bundler`.
+
 ## Installation
 
-[Fork **Chirpy**](https://github.com/cotes2020/jekyll-theme-chirpy/fork) on GitHub, rename the repository to `USERNAME.github.io` (where `USERNAME` is your GitHub username), and then open terminal and clone the fork to local by:
+There are two ways to get the theme:
 
-```terminal
+- **Install from RubyGems** - Easy to upgrade, isolate irrelevant project files so you can focus on writing.
-$ git clone https://github.com/USERNAME/USERNAME.github.io.git -b master --single-branch
+- **Fork from GitHub** - Convenient for custom development, but difficult to upgrade, only suitable for web developers.
+
+### Install From RubyGems
+
+Add this line to your Jekyll site's `Gemfile`:
+
+```ruby
+gem "jekyll-theme-chirpy"
 ```
 
-### Setting up the local envrionment
+And add this line to your Jekyll site's `_config.yml`:
 
-If you would like to run or build the project on your local machine, please follow the [Jekyll Docs](https://jekyllrb.com/docs/installation/) to complete the installation of `Ruby`, `RubyGems`, `Jekyll` and `Bundler`.
+```yaml
-
+theme: jekyll-theme-chirpy
-Before running or building for the first time, please complete the installation of the Jekyll plugins. Go to the root directory of project and run:
-
-```terminal
-$ bundle install
 ```
 
-`bundle` will automatically install all the dependencies specified by `Gemfile`.
+And then execute:
-
-### Setting up Docker environment (optional)
-
-If you're a loyal fan of [**Docker**](https://www.docker.com/) or just too lazy to install the packages mentioned in [_Setting up the local envrionment_](#setting-up-the-local-envrionment), please make sure you have **Docker Engine** installed and running, and then get Docker image `jekyll/jekyll` from Docker Hub by the following command:
 
 ```console
-$ docker pull jekyll/jekyll
+$ bundle
 ```
 
-## Usage
+Finally, copy the required files from the theme's gem (for detailed files, see [starter project][starter]) to your Jekyll site.
 
-### Initialization
+> **Hint**: To locate the installed theme’s gem, execute:
+>
+```console
+$ bundle info --path jekyll-theme-chirpy
+```
 
-Go to the root directory of the project and start initialization:
+Or you can [**use the starter template**][use-starter] to create a Jekyll site to save time copying files from theme's gem. We have prepared everything for you there!
+
+### Fork From GitHub
+
+[Fork **Chirpy**](https://github.com/cotes2020/jekyll-theme-chirpy/fork) from GitHub and clone your fork to local.
+
+Install gem dependencies by:
+
+```console
+$ bundle
+```
+
+And then execute:
 
 ```console
 $ bash tools/init.sh
 ```
 
-> **Note**: If you not intend to deploy it on GitHub Pages, append parameter option `--no-gh` at the end of the above command.
+> **Note**: If you don't plan to deploy your site on GitHub Pages, append parameter option `--no-gh` at the end of the above command.
 
 What it does is:
 
 1. Remove some files or directories from your repository:
-
     - `.travis.yml`
     - files under `_posts`
     - folder `docs`
@@ -91,28 +112,26 @@ What it does is:
 
 3. Automatically create a commit to save the changes.
 
+## Usage
+
 ### Configuration
 
-Generally, go to `_config.yml` and configure the variables as needed. Some of them are typical options:
+Update the variables of `_config.yml` as needed. Some of them are typical options:
 
 - `url`
 - `avatar`
 - `timezone`
-- `theme_mode`
+- `lang`
 
-### Run Locally
+### Running Local Server
 
 You may want to preview the site contents before publishing, so just run it by:
 
-```terminal
+```console
 $ bundle exec jekyll s
 ```
 
-Then open a browser and visit to <http://localhost:4000>.
+Or run the site on Docker with the following command:
-
-### Run on Docker
-
-Run the site on Docker with the following command:
 
 ```terminal
 $ docker run -it --rm \
@@ -121,20 +140,32 @@ $ docker run -it --rm \
     jekyll serve
 ```
 
+Open a browser and visit to _<http://localhost:4000>_.
+
 ### Deployment
 
-Before the deployment begins, checkout the file `_config.yml` and make sure the `url` is configured correctly. Furthermore, if you prefer the [_project site_](https://help.github.com/en/github/working-with-github-pages/about-github-pages#types-of-github-pages-sites) and don't use a custom domain, or you want to visit your website with a base url on a web server other than **GitHub Pages**, remember to change the `baseurl` to your project name that starting with a slash. For example, `/project`.
+Before the deployment begins, checkout the file `_config.yml` and make sure the `url` is configured correctly. Furthermore, if you prefer the [**project site**](https://help.github.com/en/github/working-with-github-pages/about-github-pages#types-of-github-pages-sites) and don't use a custom domain, or you want to visit your website with a base url on a web server other than **GitHub Pages**, remember to change the `baseurl` to your project name that starting with a slash, e.g, `/project-name`.
 
-Assuming you have already gone through the [initialization](#initialization), you can now choose ONE of the following methods to deploy your website.
+Now you can choose ONE of the following methods to deploy your Jekyll site.
 
 #### Deploy on GitHub Pages
 
-For security reasons, GitHub Pages build runs on `safe` mode, which restricts us from using plugins to generate additional page files. Therefore, we can use **GitHub Actions** to build the site, store the built site files on a new branch, and use that branch as the source of the Pages service.
+For security reasons, GitHub Pages build runs on `safe` mode, which restricts us from using plugins to generate additional page files. Therefore, we can use **GitHub Actions** to build the site, store the built site files on a new branch, and use that branch as the source of the GH Pages service.
 
-1. Push any commit to `origin/master` to trigger the GitHub Actions workflow. Once the build is complete and successful, a new remote branch named `gh-pages` will appear to store the built site files.
+Quickly check the files needed for GitHub Actions build:
+
+- Ensure your Jekyll site has the file `.github/workflows/pages-deploy.yml`. Otherwise, create a new one and fill in the contents of the [workflow file][workflow], and the value of the `on.push.branches` should be the same as your repo's default branch name.
+- Ensuer your Jekyll site has file `tools/test.sh` and `tools/deploy.sh`. Otherwise, copy them from this repo to your Jekyll site.
+
+And then rename your repoistory to `<GH-USERNAME>.github.io` on GitHub.
+
+Now publish your Jekyll site by:
+
+1. Push any commit to remote to trigger the GitHub Actions workflow. Once the build is complete and successful, a new remote branch named `gh-pages` will appear to store the built site files.
 
 2. Browse to your repo's landing page on GitHub and select the branch `gh-pages` as the [publishing source](https://docs.github.com/en/github/working-with-github-pages/configuring-a-publishing-source-for-your-github-pages-site) throught _Settings_ → _Options_ → _GitHub Pages_:
-    ![gh-pages-sources](https://raw.githubusercontent.com/cotes2020/jekyll-theme-chirpy/master/assets/img/sample/gh-pages-sources.png)
+
+    ![gh-pages-sources](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/posts/20190809/gh-pages-sources.png)
 
 3. Visit your website at the address indicated by GitHub.
 
@@ -148,7 +179,7 @@ Go to the root of the source project, build your site by:
 $ JEKYLL_ENV=production bundle exec jekyll b
 ```
 
-Or, build the site with Docker by:
+Or build the site with Docker by:
 
 ```terminal
 $ docker run -it --rm \
@@ -160,7 +191,7 @@ $ docker run -it --rm \
 
 Unless you specified the output path, the generated site files will be placed in folder `_site` of the project's root directory. Now you should upload those files to your web server.
 
-### Documentation
+## Documentation
 
 For more details and the better reading experience, please check out the [tutorials on demo site](https://chirpy.cotes.info/categories/tutorial/). In the meanwhile, a copy of the tutorial is also available on the [Wiki](https://github.com/cotes2020/jekyll-theme-chirpy/wiki).
 
@@ -174,6 +205,10 @@ This theme is mainly built with [Jekyll](https://jekyllrb.com/) ecosystem, [Boot
 
 :tada: Thanks to all the volunteers who contributed to this project, their GitHub IDs are on [this list](https://github.com/cotes2020/jekyll-theme-chirpy/graphs/contributors). Also, I won't forget those guys who submitted the issues or unmerged PR because they reported bugs, shared ideas or inspired me to write more readable documentation.
 
+Also, thank [JetBrains][jb] for providing the open source license.
+
+[![JB-logo](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/commons/jetbrains.svg)][jb]
+
 ## Supporting
 
 If you enjoy this theme or find it helpful, please consider becoming my sponsor, I'd really appreciate it! Click the button <kbd>:heart: Sponsor</kbd> at the top of the [Home Page](https://github.com/cotes2020/jekyll-theme-chirpy) and choose a link that suits you to donate; this will encourage and help me better maintain the project.
@@ -181,3 +216,9 @@ If you enjoy this theme or find it helpful, please consider becoming my sponsor,
 ## License
 
 This work is published under [MIT](https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/LICENSE) License.
+
+[starter]: https://github.com/cotes2020/chirpy-starter
+[use-starter]: https://github.com/cotes2020/chirpy-starter/generate
+[workflow]: https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/.github/workflows/pages-deploy.yml.hook
+[jb]: https://www.jetbrains.com/?from=jekyll-theme-chirpy
+

_config.yml

@@ -1,28 +1,34 @@
-# The Site Settings
+# The Site Configuration
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT licensed
 
+# Import the theme
+theme: jekyll-theme-chirpy
+
+# Only if your site type is GitHub Project sites and doesn't have a custom domain,
+# change below value to '/projectname'.
+baseurl: ''
+
+# the HTML language tag › https://www.w3.org/International/questions/qa-choosing-language-tags
+lang: en-US
+
+# Change to your timezone › http://www.timezoneconverter.com/cgi-bin/findzone/findzone
+timezone: Asia/Shanghai
 
 # jekyll-seo-tag settings › https://github.com/jekyll/jekyll-seo-tag/blob/master/docs/usage.md
 # --------------------------
 title: Chirpy                          # the main title
 
-tagline: A text-focused Jekyll theme.  # it will display as the sub-title
+tagline: A text-focused Jekyll theme   # it will display as the sub-title
 
 description: >-                        # used by seo meta and the atom feed
   A minimal, portfolio, sidebar,
   bootstrap Jekyll theme with responsive web design
   and focuses on text presentation.
 
-# fill in the base hostname & protocol for your site, e.g., 'https://username.github.io'
+# fill in the protocol & hostname for your site, e.g., 'https://username.github.io'
 url: ''
 
 author: your_full_name                  # change to your full name
 
-avatar: /assets/img/sample/avatar.jpg   # support internet resources
-
 github:
   username: github_username             # change to your github username
 
@@ -43,14 +49,6 @@ social:
 google_site_verification: google_meta_tag_verification # change to your verification string
 # --------------------------
 
-
-# Only if your site type is GitHub Project sites and doesn't have a custom domain,
-# change below value to '/projectname'.
-baseurl: ''
-
-# Change to your timezone › http://www.timezoneconverter.com/cgi-bin/findzone/findzone
-timezone: Asia/Shanghai
-
 google_analytics:
   id: ''          # Fill with your Google Analytics ID
   pv:
@@ -62,11 +60,6 @@ google_analytics:
     proxy_endpoint: ''
     cache: false  # pv data local cache, good for the users from GFW area.
 
-disqus:
-  comments: false  # boolean type, the global switch for posts comments.
-  shortname: ''    # Fill with your Disqus shortname. › https://help.disqus.com/en/articles/1717111-what-s-a-shortname
-
-
 # Prefer color scheme setting.
 #
 # Note: Keep empty will follow the system prefer color by default,
@@ -76,16 +69,31 @@ disqus:
 # Available options:
 #
 #     light  - Use the light color scheme
-#
 #     dark   - Use the dark color scheme
 #
-theme_mode:   # <light|dark>
+theme_mode:   # [light|dark]
+
+# The CDN endpoint for images.
+# Notice that once it is assigned, the CDN url
+# will be added to all image (site avatar & posts' images) paths starting with '/'
+#
+# e.g. 'https://cdn.com'
+img_cdn: ''
+
+# the avatar on sidebar, support local or CORS resources
+avatar: https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/commons/avatar.jpg
 
 # boolean type, the global switch for ToC in posts.
 toc: true
 
+disqus:
+  comments: false  # boolean type, the global switch for posts comments.
+  shortname: ''    # Fill with your Disqus shortname. › https://help.disqus.com/en/articles/1717111-what-s-a-shortname
+
 paginate: 10
 
+# ------------ The following options are not recommended to be modified ------------------
+
 kramdown:
   syntax_highlighter: rouge
   syntax_highlighter_opts:   # Rouge Options › https://github.com/jneen/rouge#full-options
@@ -98,7 +106,7 @@ kramdown:
       start_line: 1
 
 # DO NOT change this unless you're a Pro user on Jekyll and Web development,
-# or you think you're smart enough to change other relevant URLs within this template.
+# Or you think you're smart enough to change other relevant URLs within this template.
 permalink: /posts/:title/
 
 collections:
@@ -116,58 +124,21 @@ defaults:
       layout: post
       comments: true    # Enable comments in posts.
       toc: true         # Display TOC column in posts.
-      breadcrumb:
-        -
-          label: Posts
-          url: /
   -
     scope:
       path: _drafts
     values:
       comments: false
-  -
-    scope:
-      path: index.html
-    values:
-      breadcrumb:
-        -
-          label: Posts
-  -
-    scope:
-      path: tags
-    values:
-      breadcrumb:
-        -
-          label: Home
-          url: /
-        -
-          label: Tags
-          url: /tabs/tags/
-  -
-    scope:
-      path: categories
-    values:
-      breadcrumb:
-        -
-          label: Home
-          url: /
-        -
-          label: Categories
-          url: /tabs/categories/
   -
     scope:
       path: ''
       type: tabs             # see `site.collections`
     values:
       layout: page
+      permalink: /:title/
       dynamic_title: true    # Hide title in mobile screens.
-      breadcrumb:
-        -
-          label: Home
-          url: /
 
 sass:
-  sass_dir: /assets/css
   style: compressed
 
 compress_html:
@@ -181,12 +152,17 @@ compress_html:
 
 exclude:
   - vendor
-  - Gemfile.lock
   - Gemfile
+  - Gemfile.lock
+  - jekyll-theme-chirpy.gemspec
   - tools
   - docs
   - README.md
   - LICENSE
+  - gulpfile.js
+  - node_modules
+  - package.json
+  - package-lock.json
 
 jekyll-archives:
   enabled: [categories, tags]

_data/contact.yml

@@ -1,8 +1,4 @@
 #  The contact options.
-#  v2.3
-#  https://github.com/cotes2020/jekyll-theme-chirpy
-#  © 2020 Cotes Chung
-#  MIT Licensed
 
 -
   type: github

_data/date_format.yml

@@ -1,11 +1,7 @@
 #  The date format
-#  v2.1
-#  https://github.com/cotes2020/jekyll-theme-chirpy
-#  © 2020 Cotes Chung
-#  MIT Licensed
-
 
 tooltip: "%a, %b %e, %Y, %l:%M %p %z"
+
 post:
   long: "%b %e, %Y"
   short: "%b %e"

_data/label.yml

@@ -1,8 +1,4 @@
 # The label text of site.
-#  v2.0
-#  https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT Licensed
 
 panel:
   lastmod: Recent Update
@@ -11,10 +7,13 @@ panel:
 
 post:
   relate_posts: Further Reading
+  share: Share
   button:
     next: Newer
     previous: Older
 
 search_hint: Search   # text show on search bar
 
-pin_prompt: Pinned   # pinned prompt
+pin_prompt: Pinned    # pinned prompt
+
+read_time_unit: min   # see posts' time to read

_data/meta.yml

@@ -1,3 +0,0 @@
-name: Chirpy
-version: 2.7.2
-homepage: https://github.com/cotes2020/jekyll-theme-chirpy/

_data/read_time.yml

@@ -1,7 +0,0 @@
-# words per minute
-wpm: 180
-
-# minimum value
-min_time: 1
-
-prompt: min

_data/rights.yml

@@ -1,10 +1,4 @@
-#  License data.
+#  License data
-#
-#  v2.1
-#  https://github.com/cotes2020/jekyll-theme-chirpy
-#  © 2020 Cotes Chung
-#  MIT Licensed
-
 
 license:
   name: CC BY 4.0
@@ -14,4 +8,4 @@ brief: Some rights reserved.
 
 verbose: >-
   Except where otherwise noted, the blog posts on this site are licensed
-  under the Creative Commons Attribution 4.0 International (CC BY 4.0) License by the author.
+  under the Creative Commons Attribution 4.0 International (CC BY 4.0) License by the author.

_data/share.yml

@@ -1,12 +1,5 @@
 #  Sharing options at the bottom of the post.
 #  Icons from <https://fontawesome.com/>
-#
-#  v2.1
-#  https://github.com/cotes2020/jekyll-theme-chirpy
-#  © 2020 Cotes Chung
-#  MIT Licensed
-
-label: "Share"
 
 platforms:
   -

_includes/css-selector.html

@@ -1,26 +1,10 @@
 <!--
   CSS selector for site.
-  Chirpy v2.3
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2020 Cotes Chung
-  MIT Licensed
 -->
 
+<link rel="stylesheet" href="{{ '/assets/css/style.css' | relative_url }}">
 
-{% if page.layout == 'category' or page.layout == 'tag' %}
+{% if site.toc and page.toc %}
-  {% assign style = 'category-tag' %}
+  <link rel="stylesheet"
-{% else %}
+    href="https://cdn.jsdelivr.net/gh/afeld/bootstrap-toc@1.0.1/dist/bootstrap-toc.min.css">
-  {% assign style =  page.layout %}
-{% endif %}
-
-{% assign src = style | prepend: '/assets/css/' | append: '.css' | relative_url %}
-
-<link rel="preload" href="{{ src }}" as="style">
-<link rel="stylesheet" href="{{ src }}">
-
-{% if page.layout == 'post' %}
-  {% if site.toc and page.toc %}
-    <link rel="preload" as="style" href="{{ '/assets/css/lib/bootstrap-toc.min.css' | relative_url }}">
-    <link rel="stylesheet" href="{{ '/assets/css/lib/bootstrap-toc.min.css' | relative_url }}" />
-  {% endif %}
 {% endif %}

_includes/disqus.html

@@ -1,28 +1,25 @@
 <!--
   The Disqus lazy loading.
-  Powered by: https://osvaldas.info/lazy-loading-disqus-comments
+  Powered by: <https://github.com/osvaldasvalutis/disqusLoader.js>
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2019 Cotes Chung
-  MIT License
 -->
 
 <div id="disqus" class="pt-2 pb-2">
-  <p class="font-italic text-center text-muted small">
+  <p class="text-center text-muted small pb-5">
-    Comments powered by <a href="https://disqus.com/">Disqus</a>.
+    Loading comments from <a href="https://disqus.com/">Disqus</a> ...
   </p>
 </div>
 
-<script src="{{ site.baseurl }}/assets/js/lib/jquery.disqusloader.min.js"></script>
+<script src="{{ '/assets/js/lib/jquery.disqusloader.min.js' | relative_url }}"></script>
 <script>
-  var options = {
+  const options = {
     scriptUrl: '//{{ site.disqus.shortname }}.disqus.com/embed.js',
 
     disqusConfig: function() {
-      this.page.url = '{{ site.url | append: site.baseurl | append: page.url }}';
+      this.page.title = '{{ page.title }}';
+      this.page.url = '{{ page.url | absolute_url }}';
       this.page.identifier = '{{ page.url }}';
     }
   };
 
   $.disqusLoader('#disqus', options);
-</script>
+</script>

_includes/favicons.html

@@ -1,10 +1,6 @@
 <!--
   The Favicons for Web, Android, Microsoft, and iOS (iPhone and iPad) Apps
   Generated by: https://www.favicon-generator.org/
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2019 Cotes Chung
-  Published under the MIT license
 -->
 
 {% capture icon_url %}{{ site.baseurl }}/assets/img/favicons{% endcapture %}

_includes/footer.html

@@ -1,9 +1,5 @@
 <!--
   The Footer
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2017-2019 Cotes Chung
-  MIT License
 -->
 
 <footer class="d-flex w-100 justify-content-center">
@@ -24,7 +20,8 @@
         Powered by
         <a href="https://jekyllrb.com" target="_blank" rel="noopener">Jekyll</a>
         with
-        <a href="{{ site.data.meta.homepage }}" target="_blank" rel="noopener">{{ site.data.meta.name }}</a>
+        <a href="https://github.com/cotes2020/jekyll-theme-chirpy"
+          target="_blank" rel="noopener">Chirpy</a>
         theme.
       </p>
     </div>

_includes/google-analytics.html

@@ -1,9 +1,5 @@
 <!--
   The GA snippet
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2017-2019 Cotes Chung
-  MIT License
 -->
 <!-- Global site tag (gtag.js) - Google Analytics -->
 <script defer src="https://www.googletagmanager.com/gtag/js?id={{ site.google_analytics.id }}"></script>

_includes/head.html

@@ -1,15 +1,26 @@
 <!--
   The Head
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2017-2019 Cotes Chung
-  MIT License
 -->
 
 <head>
   <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
-  <meta name="theme" content="{{ site.data.meta.name }} v{{ site.data.meta.version }}">
+
+  {% if page.layout == 'home' or page.layout == 'post' %}
+    <meta name="pv-cache-enabled" content="{{ site.google_analytics.pv.enabled }}">
+
+    {% if site.google_analytics.pv.enabled %}
+      {% if site.google_analytics.pv.proxy_endpoint != ''
+        and site.google_analytics.pv.proxy_endpoint %}
+        <meta name="pv-proxy-endpoint" content="{{ site.google_analytics.pv.proxy_endpoint }}">
+      {% endif %}
+
+      {% if site.google_analytics.pv.cache %}
+        <meta name="pv-cache-data" content="{{ '/assets/js/data/pageviews.json' | relative_url }}">
+      {% endif %}
+
+    {% endif %}
+  {% endif %}
 
   {% seo title=false %}
 

_includes/js-selector.html

@@ -1,20 +1,25 @@
 <!--
   JS selector for site.
-  Chirpy v2.3
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2020 Cotes Chung
-  MIT Licensed
 -->
 
-{% if page.layout == 'home' or page.layout == 'post' or page.layout == 'categories' %}
+{% if page.layout == 'home' or page.layout == 'post' %}
-  {% assign js = page.layout %}
+  {% if site.google_analytics.pv.enabled %}
-{% else %}
+    <!-- pv-report needs countup.js -->
-  {% assign js = "page" %}
+    <script async src="https://cdn.jsdelivr.net/npm/countup.js@1.9.3/dist/countUp.min.js"></script>
+    <script async src="{{ '/assets/js/dist/pvreport.min.js' | relative_url }}"></script>
+  {% endif %}
 {% endif %}
 
-{% assign js_src = js | prepend: '/assets/js/' | append: '.min.js' | relative_url %}
+{% if page.layout == 'home'
+    or page.layout == 'post'
+    or page.layout == 'categories' %}
+  {% assign type = page.layout %}
+{% else %}
+  {% assign type = "page" %}
+{% endif %}
 
-<script async src="{{ js_src }}"></script>
+{% assign js = type | prepend: '/assets/js/dist/' | append: '.min.js' %}
+<script defer src="{{ js | relative_url }}"></script>
 
 {% if page.math %}
   <!-- MathJax -->

_includes/lozad.html

@@ -1,8 +1,10 @@
-<!-- image lazy load: https://github.com/ApoorvSaxena/lozad.js -->
+<!--
+  image lazy load: https://github.com/ApoorvSaxena/lozad.js
+-->
 <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/lozad/dist/lozad.min.js"></script>
 
 <script type="text/javascript">
-  const imgs = document.querySelectorAll('#post-wrapper img');
+  const imgs = document.querySelectorAll('.post-content img');
   const observer = lozad(imgs);
   observer.observe();
-</script>
+</script>

_includes/mermaid.html

@@ -1,7 +1,8 @@
 <!--
   mermaid-js loader
 -->
-<script src="https://cdn.jsdelivr.net/npm/mermaid/dist/mermaid.min.js"></script>
+
+<script src="https://cdn.jsdelivr.net/npm/mermaid@8/dist/mermaid.min.js"></script>
 <script>
   $(function() {
     let initTheme = "default";

_includes/mode-toggle.html

@@ -1,10 +1,5 @@
 <!--
   Switch the mode between dark and light.
-
-  v2.1
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2020 Cotes Chung
-  MIT License
 -->
 
 <i class="mode-toggle fas fa-adjust"></i>

_includes/no-linenos.html

@@ -1,9 +1,5 @@
 {% comment %}
   Remove the line number of the code snippet.
-  v2.2
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2020 Cotes Chung
-  Published under the MIT License
 {% endcomment %}
 
 {% assign content = include.content %}

_includes/panel.html

@@ -1,9 +1,5 @@
 <!--
   The Pannel on right side (Desktop views)
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2017-2019 Cotes Chung
-  MIT License
 -->
 
 <div id="panel-wrapper" class="col-xl-3 pl-2 text-muted topbar-down">
@@ -15,7 +11,7 @@
   {% if update_list.size > 0 %}
 
     <div id="access-lastmod" class="post">
-      <span>{{- site.data.label.panel.lastmod -}}</span>
+      <span>{{- site.data.label.panel.lastmod | default: 'Recent Update' -}}</span>
       <ul class="post-content pl-0 pb-1 ml-1 mt-2">
 
       {% for item in update_list %}
@@ -34,7 +30,7 @@
 
   {% if trending_tags.size > 0 %}
     <div id="access-tags">
-      <span>{{- site.data.label.panel.trending_tags -}}</span>
+      <span>{{- site.data.label.panel.trending_tags | default: 'Trending Tags' -}}</span>
       <div class="d-flex flex-wrap mt-3 mb-1 mr-3">
 
       {% for tag_name in trending_tags %}
@@ -48,9 +44,11 @@
   </div> <!-- .access -->
 
   {% if include.toc %}
+    <!-- BS-toc.js will be loaded at medium priority -->
+    <script src="https://cdn.jsdelivr.net/gh/afeld/bootstrap-toc@1.0.1/dist/bootstrap-toc.min.js"></script>
     <div id="toc-wrapper" class="pl-0 pr-4 mb-5">
       <span class="pl-3 pt-2 mb-2">
-      {{- site.data.label.panel.toc -}}
+      {{- site.data.label.panel.toc | default: 'Contents' -}}
       </span>
       <nav id="toc" data-toggle="toc"></nav>
     </div>

_includes/post-nav.html

@@ -1,31 +1,30 @@
 <!--
   Navigation buttons at the bottom of the post.
-
-  v2.1
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2020 Cotes Chung
-  MIT License
 -->
 
 <div class="post-navigation d-flex justify-content-between">
   {% if page.previous.url %}
-  <a href="{{ site.baseurl }}{{ page.previous.url }}" class="btn btn-outline-primary">
+  <a href="{{ site.baseurl }}{{ page.previous.url }}" class="btn btn-outline-primary"
+    prompt="{{ site.data.label.post.button.previous | default: 'previous' }}">
     <p>{{ page.previous.title }}</p>
   </a>
   {% else %}
-  <span class="btn btn-outline-primary disabled">
+  <span class="btn btn-outline-primary disabled"
+    prompt="{{ site.data.label.post.button.previous | default: 'previous' }}">
     <p>-</p>
   </span>
   {% endif %}
 
   {% if page.next.url %}
-  <a href="{{ site.baseurl }}{{page.next.url}}" class="btn btn-outline-primary">
+  <a href="{{ site.baseurl }}{{page.next.url}}" class="btn btn-outline-primary"
+    prompt="{{ site.data.label.post.button.next | default: 'next' }}">
     <p>{{ page.next.title }}</p>
   </a>
   {% else %}
-  <span class="btn btn-outline-primary disabled">
+  <span class="btn btn-outline-primary disabled"
+    prompt="{{ site.data.label.post.button.next | default: 'next' }}">
     <p>-</p>
   </span>
   {% endif %}
 
-</div>
+</div>

_includes/post-paginator.html

@@ -1,10 +1,5 @@
 <!--
   The paginator for post list on HomgPage.
-
-  v2.1
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2020 Cotes Chung
-  MIT License
 -->
 
 <ul class="pagination mt-4 mb-0 pl-lg-2">

_includes/post-sharing.html

@@ -1,17 +1,12 @@
 <!--
  Post sharing snippet
-
- v2.1
- https://github.com/cotes2020/jekyll-theme-chirpy
- © 2019 Cotes Chung
- Published under the MIT License
 -->
 
 <div class="share-wrapper">
-  <span class="share-label text-muted mr-1">{{ site.data.share.label }}</span>
+  <span class="share-label text-muted mr-1">{{ site.data.label.post.share | default: 'Share' }}</span>
   <span class="share-icons">
     {% capture title %}{{ page.title }} - {{ site.title }}{% endcapture %}
-    {% assign url = page.url | relative_url | prepend: site.url %}
+    {% assign url = page.url | absolute_url %}
 
     {% for share in site.data.share.platforms %}
       {% assign link = share.link | replace: 'TITLE', title | replace: 'URL', url %}

_includes/read-time.html

@@ -3,13 +3,17 @@
  -->
 {% assign words = include.content | strip_html | number_of_words: "auto" %}
 
-{% assign read_time = words | divided_by: site.data.read_time.wpm %}
+<!-- words per minute  -->
+{% assign wpm = 180 %}
+{% assign min_time = 1 %}
+
+{% assign read_time = words | divided_by: wpm %}
 
 {% unless read_time > 0 %}
-  {% assign read_time = site.data.read_time.min_time %}
+  {% assign read_time = min_time %}
 {% endunless %}
 
 <!-- return element -->
 <span class="readtime" data-toggle="tooltip" data-placement="bottom" title="{{ words }} words">
-  {{- read_time -}}{{" "}}{{- site.data.read_time.prompt -}}
+  {{- read_time -}}{{" "}}{{- site.data.label.read_time_unit | default: "min" -}}
 </span>

_includes/refactor-content.html

@@ -35,5 +35,32 @@
   %}
 {% endif %}
 
+{% if _content contains '<img src="' %}
+
+  {% if site.img_cdn != '' %}
+    {% assign img_path_replacement = '<img src="' | append: site.img_cdn | append: '/' %}
+  {% else %}
+    {% assign img_path_replacement = '<img src="' | append: site.baseurl | append: '/' %}
+  {% endif %}
+
+  {% assign _content = _content | replace: '<img src="/', img_path_replacement %}
+
+  <!-- lazy-load images <https://github.com/ApoorvSaxena/lozad.js#usage> -->
+  {% assign lozad = true %}
+  {% assign img_placehodler
+    = 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7' %}
+
+  {% assign lozad_replacement = '<img src="'
+    | append: img_placehodler
+    | append: '" data-src="' %}
+
+  {% assign _content = _content | replace: '<img src="', lozad_replacement %}
+
+{% endif %}
+
 <!-- return -->
 {{ _content }}
+
+{% if lozad %}
+  {% include lozad.html %}
+{% endif %}

_includes/related-posts.html

@@ -1,11 +1,6 @@
 <!--
  Recommend the other 3 posts according to the tags and categories of the current post,
  if the number is not enough, use the other latest posts to supplement.
-
- v2.0
- https://github.com/cotes2020/jekyll-theme-chirpy
- © 2019 Cotes Chung
- Published under the MIT License
 -->
 
 <!-- The total size of related posts  -->
@@ -85,7 +80,8 @@
 
 {% if index_list.size > 0 %}
   <div id="related-posts" class="mt-5 mb-2 mb-sm-4">
-    <h3 class="pt-2 mt-1 mb-4 ml-1" data-toc-skip>{{ site.data.label.post.relate_posts }}</h3>
+    <h3 class="pt-2 mt-1 mb-4 ml-1"
+      data-toc-skip>{{ site.data.label.post.relate_posts | default: 'Further Reading' }}</h3>
     <div class="card-deck mb-4">
     {% for entry in index_list %}
       {% assign index = entry | plus: 0 %}

_includes/search-loader.html

@@ -1,9 +1,5 @@
 <!--
   Jekyll Simple Search loader
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2017-2019 Cotes Chung
-  MIT License
 -->
 
 {% capture result_elem %}
@@ -25,8 +21,8 @@
 SimpleJekyllSearch({
   searchInput: document.getElementById('search-input'),
   resultsContainer: document.getElementById('search-results'),
-  json: '{{ site.baseurl }}/assets/js/data/search.json',
+  json: '{{ '/assets/js/data/search.json' | relative_url }}',
   searchResultTemplate: '{{ result_elem | strip_newlines }}',
   noResultsText: '{{ not_found }}'
 });
-</script>
+</script>

_includes/search-results.html

@@ -1,14 +1,10 @@
 <!--
   The Search results
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2017-2019 Cotes Chung
-  MIT License
 -->
 <div id="search-result-wrapper" class="d-flex justify-content-center unloaded">
   <div class="col-12 col-xl-11 post-content">
     <div id="search-hints">
-      <h4 class="text-muted mb-4">{{ site.data.label.panel.trending_tags }}</h4>
+      <h4 class="text-muted mb-4">{{ site.data.label.panel.trending_tags | default: 'Trending Tags' }}</h4>
 
       {% include trending-tags.html %}
 

_includes/sidebar.html

@@ -1,21 +1,21 @@
 <!--
   The Side Bar
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2017-2019 Cotes Chung
-  MIT License
 -->
 
 <div id="sidebar" class="d-flex flex-column align-items-end">
 
   <div class="profile-wrapper text-center">
     <div id="avatar">
-      <a href="{{ site.baseurl }}/" alt="avatar" class="mx-auto">
+      <a href="{{ '/' | relative_url }}" alt="avatar" class="mx-auto">
-        {% assign avatar_url = site.avatar %}
+        {% capture avatar_url %}
-        {% capture start %}{{ site.avatar | slice: 0 }}{% endcapture %}
+          {%- if site.avatar contains '://' -%}
-        {% if start == '/' %}
+            {{ site.avatar }}
-          {% assign avatar_url = avatar_url | prepend: site.baseurl %}
+          {%- elsif site.img_cdn != '' and site.img_cdn -%}
-        {% endif %}
+            {{ site.avatar | prepend: site.img_cdn }}
+          {%- else -%}
+            {{ site.avatar | relative_url }}
+          {%- endif -%}
+        {% endcapture %}
         <img src="{{ avatar_url }}" alt="avatar" onerror="this.style.display='none'">
       </a>
     </div>

_includes/timeago.html

@@ -1,27 +1,27 @@
 <!--
   Date format snippet
-
-  v2.4.1
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2020 Cotes Chung
-  MIT License
 -->
+
+{% assign tooltip_df = site.data.date_format.tooltip | default: '%a, %b %e, %Y, %l:%M %p %z' %}
+{% assign post_long_df = site.data.date_format.post.long | default: '%b %e, %Y' %}
+{% assign post_short_df = site.data.date_format.post.short | default: '%b %e' %}
+
 <span class="timeago {% if include.class %}{{ include.class }}{% endif %}"
   {% if include.tooltip %}
     data-toggle="tooltip"
     data-placement="bottom"
-    title="{{ include.date | date: site.data.date_format.tooltip }}"
+    title="{{ include.date | date: tooltip_df }}"
   {% endif %}>
 
   {% assign this_year = site.time | date: "%Y" %}
   {% assign post_year = include.date | date: "%Y" %}
 
   {% if post_year == this_year %}
-    {{ include.date | date: site.data.date_format.post.short }}
+    {{ include.date | date: post_short_df }}
   {% else %}
-    {{ include.date | date: site.data.date_format.post.long }}
+    {{ include.date | date: post_long_df }}
   {% endif %}
 
   <i class="unloaded">{{ include.date | date_to_xmlschema }}</i>
 
-</span>
+</span>

_includes/topbar.html

@@ -1,28 +1,46 @@
 <!--
   The Top Bar
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2017-2019 Cotes Chung
-  MIT License
 -->
+
 <div id="topbar-wrapper" class="row justify-content-center topbar-down">
   <div id="topbar" class="col-11 d-flex h-100 align-items-center justify-content-between">
     <span id="breadcrumb">
-      {% for item in page.breadcrumb %}
+
-        {% if item.url %}
+    {% assign paths = page.url | split: '/' %}
+
+    {% if paths.size == 0 %}
+      <!-- index page -->
+      <span>{{ 'Posts' }}</span>
+    {% else %}
+
+      {% for item in paths %}
+
+        {% if forloop.first %}
+          {% unless page.layout == 'post' %}
+          <span>
+            <a href="{{ '/' | relative_url }}">{{ 'Home' }}</a>
+          </span>
+          {% endunless %}
+
+        {% elsif forloop.last %}
+          <span>{{ page.title }}</span>
+
+        {% else %}
         <span>
-          <a href="{{ site.baseurl }}{{ item.url | remove: '.html'}}">
+          {% assign url = item %}
-            {{ item.label }}
+          {% if item == 'posts' and page.layout == 'post' %}
+            {% assign url = '/' %}
+          {% endif %}
+          <a href="{{ url | relative_url }}">
+            {{ item | capitalize }}
           </a>
         </span>
-        {% else %}
+
-          <span>{{ item.label }}</span>
         {% endif %}
+
       {% endfor %}
 
-      {% unless page.layout == "home" %}
+    {% endif %}
-        <span>{{ page.title }}</span>
-      {% endunless %}
 
     </span><!-- endof #breadcrumb -->
 
@@ -42,7 +60,7 @@
     <span id="search-wrapper" class="align-items-center">
       <i class="fas fa-search fa-fw"></i>
       <input class="form-control" id="search-input" type="search"
-        aria-label="search" placeholder="{{ site.data.label.search_hint }}...">
+        aria-label="search" placeholder="{{ site.data.label.search_hint | default: 'Search' }}...">
       <i class="fa fa-times-circle fa-fw" id="search-cleaner"></i>
     </span>
     <span id="search-cancel" >Cancel</span>

_includes/trending-tags.html

@@ -1,9 +1,5 @@
 {% comment %}
   The trending tags list
-  v2.0
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2019 Cotes Chung
-  MIT Licensed
 {% endcomment %}
 
 {% assign MAX = 10 %}

_includes/update-list.html

@@ -1,9 +1,5 @@
 {% comment %}
   Get the last 5 posts from lastmod list.
-  v2.2
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2020 Cotes Chung
-  MIT License
 {% endcomment %}
 
 {% assign MAX_SIZE = 5 %}

_layouts/archives.html

@@ -1,11 +1,6 @@
 ---
 layout: page
-
 # The Archives of posts.
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT License
 ---
 
 

_layouts/categories.html

@@ -1,11 +1,6 @@
 ---
 layout: page
-
 # All the Categories of posts
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT License
 ---
 
 

_layouts/category.html

@@ -1,9 +1,6 @@
 ---
 layout: page
 # The Category layout
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# MIT Licensed
 ---
 
 <div id="page-category">
@@ -14,11 +11,13 @@ layout: page
   </h1>
 
   <ul class="post-content pl-0">
+    {% assign post_long_df = site.data.date_format.post.long | default: '%b %e, %Y' %}
+
     {% for post in page.posts %}
     <li class="d-flex justify-content-between pl-md-3 pr-md-3">
       <a href="{{ post.url | relative_url }}">{{ post.title }}</a>
       <span class="dash flex-grow-1"></span>
-      <span class="text-muted small">{{ post.date | date: site.data.date_format.post.long }}</span>
+      <span class="text-muted small">{{ post.date | date: post_long_df }}</span>
     </li>
     {% endfor %}
   </ul>

_layouts/default.html

@@ -1,10 +1,6 @@
 ---
 layout: compress
 # Default layout
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT Licensed
 ---
 
 <!DOCTYPE html>
@@ -15,7 +11,7 @@ layout: compress
   {% endif %}
 {% endcapture %}
 
-<html lang="{{ site.lang | split: "_" | first | default: "en" }}" {{ prefer_mode }}>
+<html lang="{{ site.lang | default: "en-US" }}" {{ prefer_mode }}>
 
   {% include head.html %}
 

_layouts/home.html

@@ -1,10 +1,6 @@
 ---
 layout: page
 # The Home page layout
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT Licensed
 ---
 
 
@@ -83,7 +79,7 @@ layout: page
       {% if post.pin %}
       <div class="pin">
         <i class="fas fa-thumbtack fa-fw"></i>
-        <span>{{ site.data.label.pin_prompt }}</span>
+        <span>{{ site.data.label.pin_prompt | default: 'Pinned' }}</span>
       </div>
       {% endif %}
 

_layouts/page.html

@@ -1,10 +1,6 @@
 ---
 layout: default
 # The page layout
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT License
 ---
 
 <div class="row">

_layouts/post.html

@@ -1,10 +1,6 @@
 ---
 layout: default
 # The posts' layout
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT Licensed
 ---
 
 <div class="row">
@@ -47,21 +43,13 @@ layout: default
       </div> <!-- .post-meta -->
 
       <div class="post-content">
-        {%- capture img_placehodler -%}
-          data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7
-        {%- endcapture -%}
 
-        {% if page.image %}
+        {% if page.image.src %}
-          <img src="{{ img_placehodler }}" data-src="{{ page.image }}" class="preview-img">
+          <img src="{{ page.image.src }}" class="preview-img" alt="{{ page.image.alt | default: "Preview Image" }}">
         {% endif %}
 
-        <!-- Using lozad. See: <https://github.com/ApoorvSaxena/lozad.js#usage> -->
+        {{ content }}
-        {% if content contains '<img src=' %}
+
-          {% assign replacement = '<img src="' | append: img_placehodler | append: '" data-src=' %}
-          {{ content | replace: '<img src=', replacement }}
-        {% else %}
-          {{ content }}
-        {% endif %}
       </div>
 
       <div class="post-tail-wrapper text-muted">
@@ -140,5 +128,3 @@ layout: default
   </div> <!-- .col-* -->
 
 </div> <!-- .row -->
-
-{% include lozad.html %}

_layouts/tag.html

@@ -1,12 +1,9 @@
 ---
 layout: page
 # The layout for Tag page
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT Licensed
 ---
 
+
 <div id="page-tag">
   <h1 class="pl-lg-2">
     <i class="fa fa-tag fa-fw text-muted"></i>
@@ -14,11 +11,13 @@ layout: page
     <span class="lead text-muted pl-2">{{ page.posts | size }}</span>
   </h1>
   <ul class="post-content pl-0">
+    {% assign post_long_df = site.data.date_format.post.long | default: '%b %e, %Y' %}
+
     {% for post in page.posts %}
     <li class="d-flex justify-content-between pl-md-3 pr-md-3">
       <a href="{{ post.url | relative_url }}">{{ post.title }}</a>
       <span class="dash flex-grow-1"></span>
-      <span class="text-muted small">{{ post.date | date: site.data.date_format.post.long }}</span>
+      <span class="text-muted small">{{ post.date | date: post_long_df }}</span>
     </li>
     {% endfor %}
   </ul>

_layouts/tags.html

@@ -1,11 +1,6 @@
 ---
 layout: page
-
 # All the Tags of posts.
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT License
 ---
 
 <div id="tags" class="d-flex flex-wrap ml-xl-2 mr-xl-2">

_plugins/posts-lastmod-hook.rb

@@ -1,4 +1,7 @@
+#!/usr/bin/env ruby
+#
 # Check for changed posts
+
 Jekyll::Hooks.register :posts, :post_init do |post|
 
   commit_num = `git rev-list --count HEAD "#{ post.path }"`

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

@@ -6,7 +6,8 @@ categories: [Blogging, Demo]
 tags: [typography]
 math: true
 mermaid: true
-image: /assets/img/sample/devices-mockup.png
+image:
+  src: https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/commons/devices-mockup.png
 ---
 
 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.
@@ -97,34 +98,34 @@ Click the hook will locate the footnote[^footnote], and here is another footnote
 
 - Default (with caption)
 
-![Desktop View](/assets/img/sample/mockup.png)
+![Desktop View](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/posts/20190808/mockup.png)
 _Full screen width and center alignment_
 
 <br>
 
 - Specify width
 
-![Desktop View](/assets/img/sample/mockup.png){: width="400"}
+![Desktop View](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/posts/20190808/mockup.png){: width="400"}
 _400px image width_
 
 <br>
 
 - Left aligned
 
-![Desktop View](/assets/img/sample/mockup.png){: width="350" .normal}
+![Desktop View](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/posts/20190808/mockup.png){: width="350" .normal}
 
 <br>
 
 - Float to left
 
-  ![Desktop View](/assets/img/sample/mockup.png){: width="240" .left}
+  ![Desktop View](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/posts/20190808/mockup.png){: width="240" .left}
   "A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space."
 
 <br>
 
 - Float to right
 
-  ![Desktop View](/assets/img/sample/mockup.png){: width="240" .right}
+  ![Desktop View](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/posts/20190808/mockup.png){: width="240" .right}
   "A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space. A repetitive and meaningless text is used to fill the space."
 
 <br>

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

@@ -84,11 +84,13 @@ Then you can use it like other markdown language: surround the graph code with `
 
 ### Preview image
 
-If you want to add an image to the top of the post contents, specify the url for the image by:
+If you want to add an image to the top of the post contents, specify the url and alt attribute for the image:
 
 ```yaml
 ---
-image: /path/to/image-file
+image:
+  src: /path/to/image/file
+  alt: image alternative text
 ---
 ```
 
@@ -118,22 +120,44 @@ By default, the image is centered, but you can specify the position by using one
   Image will be left aligned in below sample:
 
   ```markdown
-  ![Desktop View](/assets/img/sample/mockup.png){: width="350" .normal}
+  ![Desktop View](/assets/img/sample/mockup.png){: .normal}
   ```
 
 - **Float to the left**
 
   ```markdown
-  ![Desktop View](/assets/img/sample/mockup.png){: width="240" .left}
+  ![Desktop View](/assets/img/sample/mockup.png){: .left}
   ```
 
 - **Float to the right**
 
   ```markdown
-  ![Desktop View](/assets/img/sample/mockup.png){: width="240" .right}
+  ![Desktop View](/assets/img/sample/mockup.png){: .right}
   ```
 
-> **Limitation**: Once you specify the position of an image, it is forbidden to add the image caption.
+**Limitation**: Once you specify the position of an image, it is forbidden to add the image caption.
+
+### CDN URL
+
+If you host the images on the CDN, you can save the time of repeatedly writing the CDN url by assigning the variable `img_cdn` of `_config.yml` file:
+
+```yaml
+img_cdn: https://cdn.com
+```
+
+Once `img_cdn` is assigned, the CDN url will be added to the path of all images (images of site avatar and posts) starting with `/`.
+
+For instance, when using images:
+
+```markdown
+![The flower](/path/to/flower.png)
+```
+
+The parsing result will automatically add the CDN prefix `https://cdn.com` before the image path:
+
+```html
+<img src="https://cdn.com/path/to/flower.png" alt="The flower">
+```
 
 ## Pinned Posts
 

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

@@ -7,104 +7,130 @@ tags: [getting started]
 pin: true
 ---
 
+## Prerequisites
+
+Follow the [Jekyll Docs](https://jekyllrb.com/docs/installation/) to complete the installation of `Ruby`, `RubyGems`, `Jekyll` and `Bundler`.
 
 ## Installation
 
-[Fork **Chirpy**](https://github.com/cotes2020/jekyll-theme-chirpy/fork) on GitHub, rename the repository to `USERNAME.github.io` (where `USERNAME` is your GitHub username), and then open terminal and clone the fork to local by:
+There are two ways to get the theme:
 
-```terminal
+- **Install from RubyGems** - Easy to upgrade, isolate irrelevant project files so you can focus on writing.
-$ git clone https://github.com/USERNAME/USERNAME.github.io.git -b master --single-branch
+- **Fork from GitHub** - Convenient for custom development, but difficult to upgrade, only suitable for web developers.
+
+### Install From RubyGems
+
+Add this line to your Jekyll site's `Gemfile`:
+
+```ruby
+gem "jekyll-theme-chirpy"
 ```
 
-### Setting up the local envrionment
+And add this line to your Jekyll site's `_config.yml`:
 
-If you would like to run or build the project on your local machine, please follow the [Jekyll Docs](https://jekyllrb.com/docs/installation/) to complete the installation of `Ruby`, `RubyGems`, `Jekyll` and `Bundler`. 
+```yaml
-
+theme: jekyll-theme-chirpy
-Before running or building for the first time, please complete the installation of the Jekyll plugins. Go to the root directory of project and run:
-
-```terminal
-$ bundle install
 ```
 
-`bundle` will automatically install all the dependencies specified by `Gemfile`.
+And then execute:
-
-### Setting up Docker environment (optional)
-
-If you're a loyal fan of [**Docker**](https://www.docker.com/) or just too lazy to install the packages mentioned in [_Setting up the local envrionment_](#setting-up-the-local-envrionment), please make sure you have **Docker Engine** installed and running, and then get Docker image `jekyll/jekyll` from Docker Hub by the following command:
 
 ```console
-$ docker pull jekyll/jekyll
+$ bundle
 ```
 
-## Usage
+Finally, copy the required files from the theme's gem (for detailed files, see [starter project][starter]) to your Jekyll site.
 
-### Initialization
+> **Hint**: To locate the installed theme’s gem, execute:
+>
+```console
+$ bundle info --path jekyll-theme-chirpy
+```
 
-Go to the root directory of the project and start initialization:
+Or you can [**use the starter template**][use-starter] to create a Jekyll site to save time copying files from theme's gem. We have prepared everything for you there!
+
+### Fork From GitHub
+
+[Fork **Chirpy**](https://github.com/cotes2020/jekyll-theme-chirpy/fork) from GitHub and clone your fork to local.
+
+Install gem dependencies by:
+
+```console
+$ bundle
+```
+
+And then execute:
 
 ```console
 $ bash tools/init.sh
 ```
 
-> **Note**: If you not intend to deploy it on GitHub Pages, append parameter option `--no-gh` at the end of the above command.
+> **Note**: If you don't plan to deploy your site on GitHub Pages, append parameter option `--no-gh` at the end of the above command.
 
 What it does is:
 
 1. Remove some files or directories from your repository:
-
     - `.travis.yml`
     - files under `_posts`
     - folder `docs`
 
-2. If you use the `--no-gh` option, the directory `.github` will be deleted. Otherwise, setup the GitHub Action workflow by removing extension `.hook` of `.github/workflows/pages-deploy.yml.hook`, and then remove the other files and directories in folder `.github`. 
+2. If you use the `--no-gh` option, the directory `.github` will be deleted. Otherwise, setup the GitHub Action workflow by removing extension `.hook` of `.github/workflows/pages-deploy.yml.hook`, and then remove the other files and directories in folder `.github`.
 
 3. Automatically create a commit to save the changes.
 
+## Usage
+
 ### Configuration
 
-Generally, go to `_config.yml` and configure the variables as needed. Some of them are typical options:
+Update the variables of `_config.yml` as needed. Some of them are typical options:
 
 - `url`
 - `avatar`
 - `timezone`
-- `theme_mode`
+- `lang`
 
-### Run Locally
+### Running Local Server
 
 You may want to preview the site contents before publishing, so just run it by:
 
-```terminal
+```console
 $ bundle exec jekyll s
 ```
 
-Then open a browser and visit to <http://localhost:4000>.
+Or run the site on Docker with the following command:
-
-### Run on Docker
-
-Run the site on Docker with the following command:
 
 ```terminal
-$ docker run --rm -it \
+$ docker run -it --rm \
     --volume="$PWD:/srv/jekyll" \
     -p 4000:4000 jekyll/jekyll \
     jekyll serve
 ```
 
+Open a browser and visit to _<http://localhost:4000>_.
 
 ### Deployment
 
-Before the deployment begins, checkout the file `_config.yml` and make sure the `url` is configured correctly. Furthermore, if you prefer the [_project site_](https://help.github.com/en/github/working-with-github-pages/about-github-pages#types-of-github-pages-sites) and don't use a custom domain, or you want to visit your website with a base url on a web server other than **GitHub Pages**, remember to change the `baseurl` to your project name that starting with a slash. For example, `/project`.
+Before the deployment begins, checkout the file `_config.yml` and make sure the `url` is configured correctly. Furthermore, if you prefer the [**project site**](https://help.github.com/en/github/working-with-github-pages/about-github-pages#types-of-github-pages-sites) and don't use a custom domain, or you want to visit your website with a base url on a web server other than **GitHub Pages**, remember to change the `baseurl` to your project name that starting with a slash, e.g, `/project-name`.
 
-Assuming you have already gone through the [initialization](#initialization), you can now choose ONE of the following methods to deploy your website.
+Now you can choose ONE of the following methods to deploy your Jekyll site.
 
 #### Deploy on GitHub Pages
 
-For security reasons, GitHub Pages build runs on `safe` mode, which restricts us from using plugins to generate additional page files. Therefore, we can use **GitHub Actions** to build the site, store the built site files on a new branch, and use that branch as the source of the Pages service.
+For security reasons, GitHub Pages build runs on `safe` mode, which restricts us from using plugins to generate additional page files. Therefore, we can use **GitHub Actions** to build the site, store the built site files on a new branch, and use that branch as the source of the GH Pages service.
 
-1. Push any commit to `origin/master` to trigger the GitHub Actions workflow. Once the build is complete and successful, a new remote branch named `gh-pages` will appear to store the built site files.
+Quickly check the files needed for GitHub Actions build:
+
+- Ensure your Jekyll site has the file `.github/workflows/pages-deploy.yml`. Otherwise, create a new one and fill in the contents of the [workflow file][workflow], and the value of the `on.push.branches` should be the same as your repo's default branch name.
+- Ensuer your Jekyll site has file `tools/test.sh` and `tools/deploy.sh`. Otherwise, copy them from this repo to your Jekyll site.
+
+And then rename your repoistory to `<GH-USERNAME>.github.io` on GitHub.
+
+Now publish your Jekyll site by:
+
+1. Push any commit to remote to trigger the GitHub Actions workflow. Once the build is complete and successful, a new remote branch named `gh-pages` will appear to store the built site files.
 
 2. Browse to your repo's landing page on GitHub and select the branch `gh-pages` as the [publishing source](https://docs.github.com/en/github/working-with-github-pages/configuring-a-publishing-source-for-your-github-pages-site) throught _Settings_ → _Options_ → _GitHub Pages_:
-    ![gh-pages-sources](/assets/img/sample/gh-pages-sources.png){: width="650" class="normal"}
+
+    ![gh-pages-sources](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/posts/20190809/gh-pages-sources.png)
 
 3. Visit your website at the address indicated by GitHub.
 
@@ -118,7 +144,7 @@ Go to the root of the source project, build your site by:
 $ JEKYLL_ENV=production bundle exec jekyll b
 ```
 
-Or, build the site with Docker by:
+Or build the site with Docker by:
 
 ```terminal
 $ docker run -it --rm \
@@ -129,3 +155,7 @@ $ docker run -it --rm \
 ```
 
 Unless you specified the output path, the generated site files will be placed in folder `_site` of the project's root directory. Now you should upload those files to your web server.
+
+[starter]: https://github.com/cotes2020/chirpy-starter
+[use-starter]: https://github.com/cotes2020/chirpy-starter/generate
+[workflow]: https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/.github/workflows/pages-deploy.yml.hook

_posts/2019-08-11-customize-the-favicon.md

@@ -11,17 +11,17 @@ In [**Chirpy**](https://github.com/cotes2020/jekyll-theme-chirpy/), the image fi
 
 With a square image (PNG, JPG or GIF) in hand, open the site [*Favicon & App Icon Generator*](https://www.favicon-generator.org/) and upload your original image.
 
-![upload-image](/assets/img/sample/upload-image.png)
+![upload-image](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/posts/20190811/upload-image.png)
 
 Click button <kbd>Create Favicon</kbd> and wait a moment for the website to generate the icons of various sizes automatically.
 
-![download-icons](/assets/img/sample/download-icons.png){: width="600"}
+![download-icons](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/posts/20190811/download-icons.png){: width="600"}
 
 Download the generated package, unzip and delete the following two from the extracted files:
 
 - browserconfig.xml
 - manifest.json
- 
+
 Now, copy the remaining image files (`.PNG` and `.ICO`) from the extracted `.zip` file to cover the original files in the folder `assets/img/favicons/`.
 
 The following table helps you understand the changes to the icon file:

_posts/2021-01-03-enable-google-pv.md

@@ -0,0 +1,245 @@
+---
+title: Enable Google Page Views
+author: Dinesh Prasanth Moluguwan Krishnamoorthy
+date: 2021-01-03 18:32:00 -0500
+categories: [Blogging, Tutorial]
+tags: [google analytics, pageviews]
+---
+
+
+This post is to enable Page Views on the [**Chirpy**][chirpy-homepage] theme based blog that you just built. This requires technical knowledge and it's recommended to keep the `google_analytics.pv` disabled unless you have a good reason. If your website has low traffic, the page views count would discourage you to write more blogs. With that said, let's start with the setup.
+
+## Set up Google Analytics
+
+### Create GA account and property
+
+First, you need to setup your account on Google analytics. While your create your account, you must create your first **Property** as well.
+
+1. Head to <https://analytics.google.com/> and click on **Start Measuring**
+2. Enter your desired _Account Name_ and choose the desired checkboxes
+3. Enter your desired _Property Name_. This is the name of the tracker project that appears on your Google Analytics dashboard
+4. Enter the required information _About your business_
+5. Hit _Create_ and accept any license popup to setup your Google Analytics account and create your property
+
+### Create Data Stream
+
+With your property created, you now need to set up Data Stream to track your blog traffic. After you signup, the prompt should automatically take you to creating your first **Data Stream**. If not, follow these steps:
+
+1. Go to **Admin** on the left column
+2. Select the desired property from the drop down on the second column
+3. Click on **Data Streams**
+4. Add a stream and click on **Web**
+5. Enter your blog's URL
+
+It should look like this:
+
+![google-analytics-data-stream](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/posts/20210103/01-google-analytics-data-stream.png)
+
+Now, click on the new data stream and grab the **Measurement ID**. It should look something like `G-V6XXXXXXXX`. Copy this to your `_config.yml` file
+
+```yaml
+google_analytics:
+  id: 'G-V6XXXXXXX'          # Fill with your Google Analytics ID
+  pv:
+    # The Google Analytics pageviews switch.
+    enabled: false
+    # the next options only valid when `google_analytics.pv` is enabled.
+    proxy_url: ''
+    proxy_endpoint: ''
+    cache: false  # pv data local cache, good for the users from GFW area.
+```
+
+When you push these changes to your blog, you should start seeing the traffic on your Google Analytics. Play around with Google Analytics dashboard to get familiar with the options available as it takes like 5 mins to pickup your changes. You should now be able to monitor your traffic in realtime.
+
+![google-analytics-realtime](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/posts/20210103/02-google-analytics-realtime.png)
+
+## Setup Page Views
+
+There is a detailed [tutorial](https://developers.google.com/analytics/solutions/google-analytics-super-proxy) available to set up Google Analytics superProxy. But, if you are interested to just quickly get your Chirpy-based blog display page views, follow along. These steps were tested on a Linux machine. If you are running Windows, you can use Git bash terminal to run Unix-like commands.
+
+### Setup Google App Engine
+
+1. Visit <https://console.cloud.google.com/appengine>
+
+2. Click on **Create Application**
+
+3. Click on **Create Project**
+
+4. Enter the name and choose the data center close to you
+
+5. Select **Python** language and **Standard** environment
+
+6. Enable billing account. Yeah, you have to link your credit card. But, you won't be billed unless you exceed your free quota. For a simple blog, free quota is more than sufficient.
+
+7. Go to your App Engine dashboard on your browser and select **API & Services** from the left navigation menu
+
+8. Click on **Enable APIs and Services** button on the top
+
+9. Enable the following APIs: _Google Analytics API_
+
+10. On the left, Click on _OAuth Consent Screen_ and accept **Configure Consent Screen**. Select **External** since your blog is probably hosted for the public. Click on **Publish** under _Publishing Status_
+
+11. Click on **Credentials** on the left and create a new **OAuth Client IDs** credential. Make sure to add a entry under `Authorized redirect URIs` that matches: `https://<project-id>.<region>.r.appspot.com/admin/auth`
+
+12. Note down the **Your Client ID** and **Your Client Secret**. You'll need this in the next section.
+
+13. Download and install the cloud SDK for your platform: <https://cloud.google.com/sdk/docs/quickstart>
+
+14. Run the following commands:
+
+    ```console
+    [root@bc96abf71ef8 /]# gcloud init
+
+    ~snip~
+
+    Go to the following link in your browser:
+
+        https://accounts.google.com/o/oauth2/auth?response_type=code&client_id=XYZ.apps.googleusercontent.com&redirect_uri=ABCDEFG
+
+    Enter verification code: <VERIFICATION CODE THAT YOU GET AFTER YOU VISIT AND AUTHENTICATE FROM THE ABOVE LINK>
+
+    You are logged in as: [blah_blah@gmail.com].
+
+    Pick cloud project to use:
+    [1] chirpy-test-300716
+    [2] Create a new project
+    Please enter numeric choice or text value (must exactly match list
+    item): 1
+
+
+    [root@bc96abf71ef8 /]# gcloud info
+    # Your selected project info should be displayed here
+    ```
+
+### Setup Google Analytics superProxy
+
+1. Clone the **Google Analytics superProxy** project on Github: <https://github.com/googleanalytics/google-analytics-super-proxy> to your local.
+
+2. Remove the first 2 lines in the [`src/app.yaml`](https://github.com/googleanalytics/google-analytics-super-proxy/blob/master/src/app.yaml#L1-L2) file:
+
+    ```yaml
+    -application: your-project-id
+    -version: 1
+    ```
+
+3. In `src/config.py`, add the `OAUTH_CLIENT_ID` and `OAUTH_CLIENT_SECRET` that you gathered from you App Engine Dashboard.
+
+4. Enter any random key for `XSRF_KEY`, your `config.py` should look similar to this
+
+    ```python
+    #!/usr/bin/python2.7
+
+    __author__ = 'pete.frisella@gmail.com (Pete Frisella)'
+
+    # OAuth 2.0 Client Settings
+    AUTH_CONFIG = {
+      'OAUTH_CLIENT_ID': 'YOUR_CLIENT_ID',
+      'OAUTH_CLIENT_SECRET': 'YOUR_CLIENT_SECRET',
+      'OAUTH_REDIRECT_URI': '%s%s' % (
+        'https://chirpy-test-XXXXXX.ue.r.appspot.com',
+        '/admin/auth'
+      )
+    }
+
+    # XSRF Settings
+    XSRF_KEY = 'OnceUponATimeThereLivedALegend'
+    ```
+
+    **Tip:** You can configure a custom domain instead of `https://PROJECT_ID.REGION_ID.r.appspot.com`. But, for the sake of keeping it simple, we will be using the Google provided default URL.
+
+5. From inside the src/ directory, deploy the app
+
+    ```console
+    [root@bc96abf71ef8 src]# gcloud app deploy
+    Services to deploy:
+
+    descriptor:      [/tmp/google-analytics-super-proxy/src/app.yaml]
+    source:          [/tmp/google-analytics-super-proxy/src]
+    target project:  [chirpy-test-XXXX]
+    target service:  [default]
+    target version:  [VESRION_NUM]
+    target url:      [https://chirpy-test-XXXX.ue.r.appspot.com]
+
+
+    Do you want to continue (Y/n)? Y
+
+    Beginning deployment of service [default]...
+    ╔════════════════════════════════════════════════════════════╗
+    ╠═ Uploading 1 file to Google Cloud Storage                 ═╣
+    ╚════════════════════════════════════════════════════════════╝
+    File upload done.
+    Updating service [default]...done.
+    Setting traffic split for service [default]...done.
+    Deployed service [default] to [https://chirpy-test-XXXX.ue.r.appspot.com]
+
+    You can stream logs from the command line by running:
+    $ gcloud app logs tail -s default
+
+    To view your application in the web browser run:
+    $ gcloud app browse
+    ```
+
+6. Visit the deployed service. Add a `/admin` to the end of the URL.
+
+7. Click on **Authorize Users** and make sure to add yourself as a managed user.
+
+8. If you get any errors, please Google it. The errors are self-explanatory and should be easy to fix.
+
+If everything went good, you'll get this screen:
+
+![superProxy-deployed](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/posts/20210103/03-superProxy-deployed.png)
+
+### Create Google Analytics Query
+
+Head to `https://PROJECT_ID.REGION_ID.r.appspot.com/admin` and create a query after verifying the account. **GA Core Reporting API** query request can be created in [Query Explorer](https://ga-dev-tools.appspot.com/query-explorer/).
+
+The query parameters are as follows:
+
+- **start-date**: fill in the first day of blog posting
+- **end-date**: fill in `today` (this is a parameter supported by GA Report, which means that it will always end according to the current query date)
+- **metrics**: select `ga:pageviews`
+- **dimensions**: select `ga:pagePath`
+
+In order to reduce the returned results and reduce the network bandwidth, we add custom filtering rules [^ga-filters]:
+
+- **filters**: fill in `ga:pagePath=~^/posts/.*/$;ga:pagePath!@=`.
+
+    Among them, `;` means using _logical AND_ to concatenate two rules.
+
+    If the `site.baseurl` is specified, change the first filtering rule to `ga:pagePath=~^/BASE_URL/posts/.*/$`, where `BASE_URL` is the value of `site.baseurl`.
+
+After <kbd>Run Query</kbd>, copy the generated contents of **API Query URI** at the bottom of the page, and fill in the **Encoded URI for the query** of SuperProxy on GAE.
+
+After the query is saved on GAE, a **Public Endpoint** (public access address) will be generated, and we will get the query result in JSON format when accessing it. Finally, click <kbd>Enable Endpoint</kbd> in **Public Request Endpoint** to make the query effective, and click <kbd>Start Scheduling</kbd> in **Scheduling** to start the scheduled task.
+
+![superproxy-query](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/posts/20210103/04-superproxy-query.png)
+
+
+## Configure Chirpy to Display Page View
+
+Once all the hard part is done, it is very easy to enable the Page View on Chirpy theme. Your superProxy dashboard should look something like below and you can grab the required values.
+
+![superproxy-dashboard](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/posts/20210103/05-superproxy-dashboard.png)
+
+Update the `_config.yml` file of [**Chirpy**][chirpy-homepage] project with the values from your dashboard, to look similar to the following:
+
+
+```yaml
+google_analytics:
+  id: 'G-XXXXXXXXXX'   # Fill with your Google Analytics ID
+  pv:
+    # The Google Analytics pageviews switch.
+    enabled: true
+    # the next options only valid when `google_analytics.pv` is enabled.
+    proxy_url: 'https://PROJECT_ID.REGION_ID.r.appspot.com'
+    proxy_endpoint: 'https://PROJECT_ID.REGION_ID.r.appspot.com/query?id=<ID FROM SUPER PROXY>'
+    cache: false      # pv data local cache, good for the users from GFW area.
+```
+
+Now, you should see the Page View enabled on your blog.
+
+## Reference
+
+[^ga-filters]: [Google Analytics Core Reporting API: Filters](https://developers.google.com/analytics/devguides/reporting/core/v3/reference#filters)
+
+[chirpy-homepage]: https://github.com/cotes2020/jekyll-theme-chirpy/

_sass/addon/module.scss

@@ -1,10 +1,5 @@
 /*
 * Mainly scss modules, only imported to `assets/css/main.scss`
-*
-* v2.1
-* https://github.com/cotes2020/jekyll-theme-chirpy
-* © 2020 Cotes Chung
-* MIT Licensed
 */
 
 /* ---------- scss placeholder --------- */
@@ -100,6 +95,7 @@
 
 @mixin panel-label {
   @include label(inherit);
+
   display: block;
   line-height: 1.2;
   padding-top: 0.5rem;

_sass/addon/syntax.scss

@@ -1,13 +1,9 @@
 /*
 * The syntax highlight.
-* v2.0
-* https://github.com/cotes2020/jekyll-theme-chirpy
-* © 2018-2019 Cotes Chung
-* MIT Licensed
 */
 
-@import "_colors/light-syntax";
+@import "colors/light-syntax";
-@import "_colors/dark-syntax";
+@import "colors/dark-syntax";
 
 html:not([mode]),
 html[mode=light] {
@@ -132,6 +128,15 @@ code {
 
 td.rouge-code {
   padding: 1.5rem 1.5rem 1.5rem 1rem;
+
+  // Prevent some browser extends from
+  // changing the URL string of code block.
+  a {
+    color: inherit !important;
+    border-bottom: none !important;
+    pointer-events: none;
+  }
+
 }
 
 /* Hide line numbers for default, console, and terminal code snippets */

_sass/addon/variables.scss

@@ -1,10 +1,5 @@
 /*
 * Mainly scss variables
-*
-* v2.1
-* https://github.com/cotes2020/jekyll-theme-chirpy
-* © 2020 Cotes Chung
-* MIT Licensed
 */
 
 /* --- ↓ width and height ---- */

_sass/colors/dark-syntax.scss

@@ -1,10 +1,6 @@
-/*!
+/*
-* The syntax dark mode styles.
+ * The syntax dark mode styles.
-* v2.0
+ */
-* https://github.com/cotes2020/jekyll-theme-chirpy
-* © 2018-2019 Cotes Chung
-* MIT Licensed
-*/
 
 @mixin dark-syntax {
   /* -----  My styles ------ */

_sass/colors/dark-typography.scss

@@ -1,10 +1,6 @@
-/*!
+/*
-* The main dark mode styles
+ * The main dark mode styles
-* v2.0
+ */
-* https://github.com/cotes2020/jekyll-theme-chirpy
-* © 2018-2019 Cotes Chung
-* MIT Licensed
-*/
 
 @mixin dark-scheme {
   /* framework */
@@ -52,7 +48,7 @@
   --btn-paginator-border-color: var(--btn-border-color);
   --btn-paginator-shadow: var(--main-wrapper-bg);
   --pin-bg: rgb(34 35 37);
-  --pin-color: iherit;
+  --pin-color: inherit;
 
   /* Posts */
   --toc-highlight: rgb(116, 178, 243);

_sass/colors/light-syntax.scss

@@ -1,10 +1,6 @@
-/*!
+/*
-* The syntax light mode code snippet colors.
+ * The syntax light mode code snippet colors.
-* v2.1
+ */
-* https://github.com/cotes2020/jekyll-theme-chirpy
-* © 2020 Cotes Chung
-* MIT Licensed
-*/
 
 @mixin light-syntax {
   /* see: <https://raw.githubusercontent.com/jwarby/pygments-css/master/github.css> */

_sass/colors/light-typography.scss

@@ -1,10 +1,6 @@
-/*!
+/*
-* The syntax light mode typography colors
+ * The syntax light mode typography colors
-* v2.1
+ */
-* https://github.com/cotes2020/jekyll-theme-chirpy
-* © 2020 Cotes Chung
-* MIT Licensed
-*/
 
 @mixin light-scheme {
   /* Common */

_sass/jekyll-theme-chirpy.scss

@@ -0,0 +1,23 @@
+/*!
+ * The styles for Jekyll theme Chirpy
+ *
+ * Chirpy v3.1.0 (https://github.com/cotes2020/jekyll-theme-chirpy)
+ * © 2019 Cotes Chung
+ * MIT Licensed
+ */
+
+@import
+  "colors/light-typography",
+  "colors/dark-typography",
+
+  "addon/module",
+  "addon/variables",
+  "addon/syntax",
+  "addon/commons",
+
+  "layout/home",
+  "layout/post",
+  "layout/tags",
+  "layout/archives",
+  "layout/categories",
+  "layout/category-tag";

_sass/layout/archives.scss

@@ -1,13 +1,6 @@
----
+/*
-# Style for Archives
+  Style for Archives
-# v2.0
+*/
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2019 Cotes Chung
-# MIT License
----
-
-
-{% include_relative _addon/main.scss %}
 
 %date-timeline {
   content: "";
@@ -21,34 +14,12 @@
 
 #archives {
   letter-spacing: 0.03rem;
-  li {
-    font-size: 1.1rem;
-    line-height: 3rem;
-    &:nth-child(odd) {
-      background-color: var(--main-wrapper-bg, #fff);
-      background-image: linear-gradient(
-        to left, #fff, #fbfbfb, #fbfbfb, #fbfbfb, #fff);
-    }
-    > div {
-      white-space: nowrap;
-      overflow: hidden;
-      text-overflow: ellipsis;
-    }
-  }
 
   span.lead {
     font-size: 1.5rem;
     position: relative;
     left: 8px;
 
-    &:not(:first-child) {
-      position: relative;
-      left: 4px;
-      &::after {
-        left: 67px;
-      }
-    }
-
     &::after { /* Year dot */
       content: "";
       display: block;
@@ -66,8 +37,64 @@
       box-shadow: 0 0 2px 0 #c2c6cc;
       z-index: 1;
     }
+
+    &:not(:first-child) {
+      position: relative;
+      left: 4px;
+      &::after {
+        left: 67px;
+      }
+    }
+
   } // #archives span.lead
 
+  ul {
+    li {
+      font-size: 1.1rem;
+      line-height: 3rem;
+
+      div {
+        white-space: nowrap;
+        overflow: hidden;
+        text-overflow: ellipsis;
+
+        a {
+          /* post title in Archvies */
+          margin-left: 2.5rem;
+          position: relative;
+          top: 0.1rem;
+        }
+      }
+
+      &:nth-child(odd) {
+        background-color: var(--main-wrapper-bg, #fff);
+        background-image: linear-gradient(to left, #fff, #fbfbfb, #fbfbfb, #fbfbfb, #fff);
+      }
+
+      &::after {
+        @extend %date-timeline;
+
+        height: 2.8rem;
+        top: -1.3rem;
+      }
+
+      &:first-child::before {
+        @extend %date-timeline;
+
+        height: 3.06rem;
+        top: -1.61rem;
+      }
+    }
+
+    &:not(:last-child) > li:last-child::after {
+      height: 3.4rem;
+    }
+
+    &:last-child > li:last-child::after {
+      display: none;
+    }
+  } // #archives ul
+
   .date {
     white-space: nowrap;
     display: inline-block;
@@ -104,36 +131,8 @@
     }
   } // #archives .date
 
-  ul {
-    > li {
-      > div > a {
-        /* post title in Archvies */
-        margin-left: 2.5rem;
-        position: relative;
-        top: 0.1rem;
-      }
-      &::after {
-        @extend %date-timeline;
-        height: 2.8rem;
-        top: -1.3rem;
-      }
-      &:first-child::before {
-        @extend %date-timeline;
-        height: 3.06rem;
-        top: -1.61rem;
-      }
-    }
-    &:not(:last-child) > li:last-child::after {
-      height: 3.4rem;
-    }
-    &:last-child > li:last-child::after {
-      display: none;
-    }
-  } // #archives ul
-
 } // #archives
 
-
 @media all and (max-width: 576px) {
   #archives {
     margin-top: -1rem;

_sass/layout/categories.scss

@@ -1,13 +1,6 @@
----
+/*
-# Style for Tab Categories
+  Style for Tab Categories
-# v2.0
+*/
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2019 Cotes Chung
-# MIT License
----
-
-
-{% include_relative _addon/main.scss %}
 
 %category-icon-color {
   color: gray;
@@ -18,6 +11,14 @@
   .card-header {
     padding-right: 12px;
   }
+
+  i {
+    &.far,
+    &.fas {
+      font-size: 86%; // fontawesome icons
+    }
+  }
+
   .list-group-item {
     border-left: none;
     border-right: none;
@@ -36,12 +37,6 @@
     @extend %category-icon-color;
   }
 
-  i {
-    &.far, &.fas {
-      font-size: 86%; // fontawesome icons
-    }
-  }
-
 } // .categories
 
 .category-trigger {
@@ -49,7 +44,7 @@
   height: 1.7rem;
   border-radius: 50%;
   text-align: center;
-  color: #6c757d!important;
+  color: #6c757d !important;
   > i.fas {
     position: relative;
     height: 0.7rem;

_sass/layout/category-tag.scss

@@ -1,18 +1,18 @@
----
+/*
-# Style for page Category and Tag
+  Style for page Category and Tag
-# v2.0
+*/
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2019 Cotes Chung
-# MIT License
----
 
+.dash {
+  margin: 0 .5rem .6rem .5rem;
+  border-bottom: 2px dotted var(--dash-color);
+}
 
-{% include_relative _addon/main.scss %}
+#page-category,
-
+#page-tag {
-#page-category, #page-tag {
   ul > li {
     line-height: 1.5rem;
     padding: 0.6rem 0;
+
     &::before { // dot
       background: #999;
       width: 5px;
@@ -24,14 +24,16 @@
       top: 0.6rem;
       margin-right: 0.5rem;
     }
+
     > a { /* post's title */
-      font-size: 1.1rem;
       @extend %no-bottom-border;
+
+      font-size: 1.1rem;
     }
+
     > span:last-child {
       white-space: nowrap;
-    }
+    } /* post's date */
-    /* post's date */
   }
 }
 
@@ -43,22 +45,19 @@
   font-size: 1.25rem;
 }
 
-a:hover {
+#page-category,
-  #page-category &,
+#page-tag,
-  #page-tag &,
+#access-lastmod {
-  #access-lastmod & {
+  a:hover {
     @extend %link-hover;
+
     margin-bottom: -1px; // Avoid jumping
   }
 }
 
-.dash {
-  margin: 0 .5rem .6rem .5rem;
-  border-bottom: 2px dotted var(--dash-color);
-}
-
 @media all and (max-width: 576px) {
-  #page-category, #page-tag {
+  #page-category,
+  #page-tag {
     ul > li {
       &::before {
         margin: 0 .5rem;

_sass/layout/home.scss

@@ -1,12 +1,60 @@
----
+/*
-# Style for Homepage
+  Style for Homepage
-# v2.0
+*/
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2019 Cotes Chung
-# MIT License
----
 
-{% include_relative _addon/main.scss %}
+.pagination {
+  font-size: 1rem;
+  a:hover {
+    text-decoration: none;
+  }
+
+  .page-item {
+    .page-link {
+      color: var(--btn-patinator-text-color);
+      width: 2.5rem;
+      height: 2.5rem;
+      padding: 0;
+      text-align: center;
+      display: -webkit-box;
+      display: flex;
+      -webkit-box-pack: center;
+      justify-content: center;
+      -webkit-box-align: center;
+      align-items: center;
+      border-radius: 50%;
+      border: 1px solid var(--btn-paginator-border-color);
+      font-family: 'Lato', sans-serif;
+      background-color: var(--button-bg);
+      &:hover {
+        background-color: var(--btn-paginator-hover-color);
+      }
+    }
+    &.active {
+      .page-link {
+        background-color: var(--btn-active-bg);
+        border-color: var(--btn-active-border-color);
+        box-shadow: 0 0 8px 0 var(--btn-paginator-shadow) !important;
+        color: var(--btn-text-color);
+      }
+    }
+    &.disabled {
+      cursor: not-allowed;
+      .page-link {
+        color: rgba(108, 117, 125, 0.57);
+        border-color: var(--btn-paginator-border-color);
+        background-color: var(--button-bg);
+      }
+    }
+    &:first-child .page-link,
+    &:last-child .page-link {
+      border-radius: 50%;
+    }
+    &:not(:last-child) {
+      margin-right: 0.7rem;
+    }
+  } // .page-item
+
+} // .pagination
 
 #post-list {
   margin-top: 1rem;
@@ -17,6 +65,10 @@
     padding-bottom: 1rem;
     border-bottom: 1px solid var(--main-border-color);
 
+    a:hover {
+      @extend %link-hover;
+    }
+
     h1 {
       font-size: 1.4rem;
       margin: 0;
@@ -61,60 +113,6 @@
 
 } // #post-list
 
-.pagination {
-  font-size: 1rem;
-  a:hover {
-    text-decoration: none;
-  }
-
-  .page-item {
-    .page-link {
-      color: var(--btn-patinator-text-color);
-      width: 2.5rem;
-      height: 2.5rem;
-      padding: 0;
-      text-align: center;
-      display: -webkit-box;
-      display: flex;
-      -webkit-box-pack: center;
-      justify-content: center;
-      -webkit-box-align: center;
-      align-items: center;
-      border-radius: 50%;
-      border: 1px solid var(--btn-paginator-border-color);
-      font-family: 'Lato', sans-serif;
-      background-color: var(--button-bg);
-      &:hover {
-        background-color: var(--btn-paginator-hover-color)
-      }
-    }
-    &.active {
-      .page-link {
-        background-color: var(--btn-active-bg);
-        border-color: var(--btn-active-border-color);
-        box-shadow: 0 0 8px 0 var(--btn-paginator-shadow) !important;
-        color: var(--btn-text-color);
-      }
-    }
-    &.disabled {
-      cursor: not-allowed;
-      .page-link {
-        color: rgba(108, 117, 125, 0.57);
-        border-color: var(--btn-paginator-border-color);
-        background-color: var(--button-bg);
-      }
-    }
-    &:first-child .page-link,
-    &:last-child .page-link {
-      border-radius: 50%;
-    }
-    &:not(:last-child) {
-      margin-right: 0.7rem;
-    }
-  } // .page-item
-
-} // .pagination
-
 /* Hide SideBar and TOC */
 @media all and (max-width: 830px) {
   .pagination {

_sass/layout/post.scss

@@ -1,21 +1,10 @@
----
+/*
-# Post-specific style
+  Post-specific style
-# v2.0
+*/
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2019 Cotes Chung
-# MIT License
----
-
-
-{% include_relative _addon/main.scss %}
-{% include_relative _addon/syntax.scss %}
-
-$prompt-older: "{{ site.data.label.post.button.previous }}";
-$prompt-newer: "{{ site.data.label.post.button.next }}";
 
 @mixin btn-sharing-color($light-color, $important: false) {
   @if $important {
-    color: var(--btn-share-color, $light-color)!important;
+    color: var(--btn-share-color, $light-color) !important;
   } @else {
     color: var(--btn-share-color, $light-color);
   }
@@ -34,15 +23,17 @@ $prompt-newer: "{{ site.data.label.post.button.next }}";
   padding-right: $pr;
 }
 
-.post .post-meta {
+#post-wrapper .post-meta {
   > div:nth-child(2) {
     > span:not(:first-child)::before {
       @include dot;
     }
   }
+
   #pv::after {
     content: " views";
   }
+
   .readtime::after {
     content: " read";
   }
@@ -50,9 +41,10 @@ $prompt-newer: "{{ site.data.label.post.button.next }}";
 
 .post-content {
   .preview-img {
-    margin-top: 0;
-    margin-bottom: 2.5rem;
     @include align-center;
+
+    margin-top: 0;
+    margin-bottom: 2.5rem !important;
   }
 }
 
@@ -72,6 +64,7 @@ $prompt-newer: "{{ site.data.label.post.button.next }}";
 
   .btn {
     @include btn-post-nav;
+
     color: var(--link-color);
     &:hover {
       background: #2a408e;
@@ -80,6 +73,7 @@ $prompt-newer: "{{ site.data.label.post.button.next }}";
     }
     &.disabled {
       @include btn-post-nav;
+
       pointer-events: auto;
       cursor: not-allowed;
       background: none;
@@ -91,6 +85,12 @@ $prompt-newer: "{{ site.data.label.post.button.next }}";
     &.btn-outline-primary.disabled:focus {
       box-shadow: none;
     }
+    &::before {
+      color: var(--text-muted-color);
+      font-size: 0.65rem;
+      text-transform: uppercase;
+      content: attr(prompt);
+    }
   }
 
   p {
@@ -100,29 +100,19 @@ $prompt-newer: "{{ site.data.label.post.button.next }}";
     white-space: normal;
   }
 
-  a, span {
+  a {
-    &::before {
-      color: var(--text-muted-color);
-      font-size: 0.65rem;
-      text-transform: uppercase;
-    }
     &:first-child {
       border-top-right-radius: 0;
       border-bottom-right-radius: 0;
       left: 0.5px;
-      &::before {
-        content: $prompt-older
-      }
     }
     &:last-child {
       border-top-left-radius: 0;
       border-bottom-left-radius: 0;
       right: 0.5px;
-      &::before {
-        content: $prompt-newer
-      }
     }
   }
+
 } // .post-navigation
 
 @keyframes fade-up {
@@ -153,17 +143,16 @@ $prompt-newer: "{{ site.data.label.post.button.next }}";
   }
 }
 
-#toc li>a {
+#toc li > a {
   line-height: 1rem;
   padding-top: 0.5rem;
   padding-bottom: 0.5rem;
 }
 
-
+/* --- Related Posts --- */
-/*--- Related Posts ---*/
 
 #related-posts {
-  >h3 {
+  > h3 {
     @include label(1.1rem, 600);
   }
   .card {
@@ -179,7 +168,7 @@ $prompt-newer: "{{ site.data.label.post.button.next }}";
     &:hover {
       -webkit-transform: translate3d(0, -3px, 0);
       transform: translate3d(0, -3px, 0);
-      box-shadow: 0 10px 15px -4px rgba(0,0,0,0.15);
+      box-shadow: 0 10px 15px -4px rgba(0, 0, 0, 0.15);
     }
   }
 
@@ -204,7 +193,7 @@ $prompt-newer: "{{ site.data.label.post.button.next }}";
   ul {
     list-style-type: none;
     padding-inline-start: 1.5rem;
-    >li::before {
+    > li::before {
       background: #c2c9d4;
       width: 5px;
       height: 5px;
@@ -230,12 +219,17 @@ $prompt-newer: "{{ site.data.label.post.button.next }}";
 }
 
 %btn-share-hovor {
-  color: var(--btn-share-hover-color)!important;
+  color: var(--btn-share-hover-color) !important;
 }
 
 .share-wrapper {
   vertical-align: middle;
   user-select: none;
+
+  i {
+    font-weight: 400;
+  }
+
   .share-icons {
     font-size: 1.2rem;
     a {
@@ -244,12 +238,12 @@ $prompt-newer: "{{ site.data.label.post.button.next }}";
       }
       &:hover {
         text-decoration: none;
-        >i {
+        > i {
           @extend %btn-share-hovor;
         }
       }
     }
-    >i {
+    > i {
       padding-top: 0.35rem;
       &:hover {
         @extend %btn-share-hovor;
@@ -257,7 +251,7 @@ $prompt-newer: "{{ site.data.label.post.button.next }}";
     }
     .fab {
       &.fa-twitter {
-        @include btn-sharing-color(rgba(29, 161, 242, 1.00));
+        @include btn-sharing-color(rgba(29, 161, 242, 1));
       }
       &.fa-facebook-square {
         @include btn-sharing-color(rgb(66, 95, 156));
@@ -278,9 +272,9 @@ $prompt-newer: "{{ site.data.label.post.button.next }}";
 
 } // .share-wrapper
 
-
 .share-label {
   @include label(inherit, 400, inherit);
+
   &::after {
     content: ":";
   }
@@ -288,49 +282,56 @@ $prompt-newer: "{{ site.data.label.post.button.next }}";
 
 .license-wrapper {
   line-height: 1.2rem;
-  >a {
+  > a {
     font-weight: 600;
     &:hover {
       @extend %link-hover;
     }
   }
-  i {
+
-    font-weight: 400;
-  }
   span:last-child {
     font-size: 0.85rem;
   }
 } // .license-wrapper
 
-
 @media all and (max-width: 576px) {
   .post-tail-bottom {
-    -ms-flex-wrap: wrap-reverse!important;
+    -ms-flex-wrap: wrap-reverse !important;
-    flex-wrap: wrap-reverse!important;
+    flex-wrap: wrap-reverse !important;
     >div:first-child {
       width: 100%;
       margin-top: 1rem;
     }
   }
+
+  .post-content > div[class^='language-'] {
+    @include ml-mr(-1.25rem);
+
+    border-radius: 0;
+    &::before { // the lang badge
+      right: 1rem;
+    }
+  }
+
 }
 
 @media all and (max-width: 768px) {
-  .post img {
+  .post-content > p > img {
     max-width: calc(100% + 1rem);
   }
 }
 
 @media all and (min-width: 768px) {
-  .post {
+  #post-wrapper {
     .post-meta {
       >div:not(:first-child)::before {
         @include dot(0.5rem, 0.2rem);
       }
       &.flex-column {
-        -webkit-box-orient: horizontal!important;
+        -webkit-box-orient: horizontal !important;
-        -webkit-box-direction: normal!important;
+        -webkit-box-direction: normal !important;
-        -ms-flex-direction: row!important;
+        -ms-flex-direction: row !important;
-        flex-direction: row!important;
+        flex-direction: row !important;
       }
     }
   } // .post

_sass/layout/tags.scss

@@ -1,13 +1,6 @@
----
+/*
-# Styles for Tab Tags
+  Styles for Tab Tags
-# v2.0
+*/
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2019 Cotes Chung
-# MIT License
----
-
-
-{% include_relative _addon/main.scss %}
 
 .tag {
   border-radius: 0.7em;

_tabs/about.md

@@ -2,12 +2,6 @@
 title: About
 icon: fas fa-info
 order: 4
-
-# The About page
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2017-2019 Cotes Chung
-# MIT License
 ---
 
 

app.js

@@ -1,12 +1,8 @@
 ---
 layout: compress
-# Chirpy v2.2
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2020 Cotes Chung
-# MIT Licensed
 ---
 
 /* Registering Service Worker */
 if('serviceWorker' in navigator) {
   navigator.serviceWorker.register('{{ "/sw.js" | relative_url }}');
-};
+};

assets/css/lib/bootstrap-toc.min.css

@@ -1,4 +0,0 @@
-/*!
- * Bootstrap Table of Contents v1.0.1 (http://afeld.github.io/bootstrap-toc/)
- * Copyright 2015 Aidan Feldman
- * Licensed under MIT (https://github.com/afeld/bootstrap-toc/blob/gh-pages/LICENSE.md) */nav[data-toggle=toc] .nav>li>a{display:block;padding:4px 20px;font-size:13px;font-weight:500;color:#767676}nav[data-toggle=toc] .nav>li>a:focus,nav[data-toggle=toc] .nav>li>a:hover{padding-left:19px;color:#563d7c;text-decoration:none;background-color:transparent;border-left:1px solid #563d7c}nav[data-toggle=toc] .nav-link.active,nav[data-toggle=toc] .nav-link.active:focus,nav[data-toggle=toc] .nav-link.active:hover{padding-left:18px;font-weight:700;color:#563d7c;background-color:transparent;border-left:2px solid #563d7c}nav[data-toggle=toc] .nav-link+ul{display:none;padding-bottom:10px}nav[data-toggle=toc] .nav .nav>li>a{padding-top:1px;padding-bottom:1px;padding-left:30px;font-size:12px;font-weight:400}nav[data-toggle=toc] .nav .nav>li>a:focus,nav[data-toggle=toc] .nav .nav>li>a:hover{padding-left:29px}nav[data-toggle=toc] .nav .nav>li>.active,nav[data-toggle=toc] .nav .nav>li>.active:focus,nav[data-toggle=toc] .nav .nav>li>.active:hover{padding-left:28px;font-weight:500}nav[data-toggle=toc] .nav-link.active+ul{display:block}

assets/css/page.scss

@@ -1,10 +0,0 @@
----
-# The default style for layout Page
-# v2.2
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2020 Cotes Chung
-# MIT License
----
-
-{% include_relative _addon/main.scss %}
-{% include_relative _addon/syntax.scss %}

assets/css/style.scss

@@ -0,0 +1,7 @@
+---
+---
+
+// see: /_sass/addon/commons.scss
+$tab-count: {{ site.tabs | size | plus: 1 }}; // plus 1 for home tab
+
+@import "jekyll-theme-chirpy";

assets/img/favicons/browserconfig.xml

@@ -2,10 +2,6 @@
 layout: compress
 
 # A part of the Favicons
-# v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2019 Cotes Chung
-# MIT License
 ---
 <?xml version="1.0" encoding="utf-8"?>
 <browserconfig>
@@ -17,4 +13,4 @@ layout: compress
       <TileColor>#ffffff</TileColor>
     </tile>
   </msapplication>
-</browserconfig>
+</browserconfig>

assets/img/favicons/manifest.json

@@ -2,10 +2,6 @@
 layout: compress
 #
 # A part of the Favicons
-# Chirpy v2.0
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2019 Cotes Chung
-# MIT License
 ---
 
 {% assign icon_url = "/assets/img/favicons" | relative_url %}

assets/js/.copyright

@@ -0,0 +1,5 @@
+/*!
+ * Chirpy v3.1.0 (https://github.com/cotes2020/jekyll-theme-chirpy/)
+ * © 2019 Cotes Chung
+ * MIT Licensed
+ */

assets/js/_commons.js

@@ -1,23 +0,0 @@
-/*!
-  Aggregation of common JS.
-  Chirpy@2.3
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2020 Cotes Chung
-  MIT License
-*/
-
-{% include_relative _commons/back-to-top.js %}
-
-{% include_relative _commons/search-display.js %}
-
-{% include_relative _commons/sidebar.js %}
-
-{% include_relative _commons/topbar-switch.js %}
-
-{% include_relative _commons/topbar-title.js %}
-
-{% include_relative _commons/copy-link.js %}
-
-{% include_relative _commons/checkbox.js %}
-
-{% include_relative _utils/tooltip-loader.js %}

assets/js/_commons/copy-link.js

@@ -1,17 +1,13 @@
 /*
  * Copy current page url to clipboard.
- * v2.1
- * https://github.com/cotes2020/jekyll-theme-chirpy
- * © 2020 Cotes Chung
- * MIT License
  */
 
 function copyLink(url) {
   if (!url || 0 === url.length) {
     url = window.location.href;
   }
-  
+
-  var $temp = $("<input>");
+  const $temp = $("<input>");
   $("body").append($temp);
   $temp.val(url).select();
   document.execCommand("copy");

assets/js/_commons/search-display.js

@@ -1,31 +1,27 @@
 /*
 * This script make #search-result-wrapper switch to unloaded or shown automatically.
-* v2.0
-* https://github.com/cotes2020/jekyll-theme-chirpy
-* © 2018-2019 Cotes Chung
-* MIT License
 */
 
 $(function() {
 
-  var btnSbTrigger = $("#sidebar-trigger");
+  const btnSbTrigger = $("#sidebar-trigger");
-  var btnSearchTrigger = $("#search-trigger");
+  const btnSearchTrigger = $("#search-trigger");
-  var btnCancel = $("#search-cancel");
+  const btnCancel = $("#search-cancel");
-  var btnClear = $("#search-cleaner");
+  const btnClear = $("#search-cleaner");
 
-  var main = $("#main");
+  const main = $("#main");
-  var topbarTitle = $("#topbar-title");
+  const topbarTitle = $("#topbar-title");
-  var searchWrapper = $("#search-wrapper");
+  const searchWrapper = $("#search-wrapper");
-  var resultWrapper = $("#search-result-wrapper");
+  const resultWrapper = $("#search-result-wrapper");
-  var results = $("#search-results");
+  const results = $("#search-results");
-  var input = $("#search-input");
+  const input = $("#search-input");
-  var hints = $("#search-hints");
+  const hints = $("#search-hints");
 
 
   /*--- Actions in small screens (Sidebar unloaded) ---*/
 
-  var scrollBlocker = (function() {
+  const scrollBlocker = (function () {
-    var offset = 0;
+    let offset = 0;
     return {
       block() {
         offset = $(window).scrollTop();
@@ -39,7 +35,7 @@ $(function() {
     };
   }());
 
-  var mobileSearchBar = (function() {
+  const mobileSearchBar = (function () {
     return {
       on() {
         btnSbTrigger.addClass("unloaded");
@@ -58,37 +54,37 @@ $(function() {
     };
   }());
 
-  var resultSwitch = (function() {
+  const resultSwitch = (function () {
-    var visable = false;
+    let visible = false;
 
     return {
       on() {
-        if (!visable) {
+        if (!visible) {
           resultWrapper.removeClass("unloaded");
           main.addClass("hidden");
 
-          visable = true;
+          visible = true;
           scrollBlocker.block();
         }
       },
       off() {
-        if (visable) {
+        if (visible) {
           results.empty();
           if (hints.hasClass("unloaded")) {
             hints.removeClass("unloaded");
           }
           resultWrapper.addClass("unloaded");
-          btnClear.removeClass("visable");
+          btnClear.removeClass("visible");
           main.removeClass("hidden");
 
           input.val("");
-          visable = false;
+          visible = false;
 
           scrollBlocker.release();
         }
       },
-      isVisable() {
+      isVisible() {
-        return visable;
+        return visible;
       }
     };
 
@@ -130,7 +126,7 @@ $(function() {
         resultSwitch.on();
 
         if (!btnClear.hasClass("visible")) {
-          btnClear.addClass("visable");
+          btnClear.addClass("visible");
         }
 
         if (isMobileView()) {
@@ -149,7 +145,7 @@ $(function() {
       resultSwitch.off();
     }
     input.focus();
-    btnClear.removeClass("visable");
+    btnClear.removeClass("visible");
   });
 
 });

assets/js/_commons/sidebar.js

@@ -1,17 +1,13 @@
 /**
  * Expand or close the sidebar in mobile screens.
- * v2.0
- * https://github.com/cotes2020/jekyll-theme-chirpy
- * © 2018-2019 Cotes Chung
- * MIT License
  */
 
 $(function() {
 
-  var sidebarUtil = (function() {
+  const sidebarUtil = (function () {
     const ATTR_DISPLAY = "sidebar-display";
-    var isExpanded = false;
+    let isExpanded = false;
-    var body = $("body");
+    const body = $("body");
 
     return {
       toggle() {

assets/js/_commons/tooltip-loader.js

@@ -1,9 +1,5 @@
 /**
  * Initial Bootstrap Tooltip.
- * v2.0
- * https://github.com/cotes2020/jekyll-theme-chirpy
- * © 2019 Cotes Chung
- * MIT License
 */
 $(function () {
   $("[data-toggle=\"tooltip\"]").tooltip();

assets/js/_commons/topbar-switch.js

@@ -1,17 +1,19 @@
 /*
  * Hide Header on scroll down
- * v2.0
- * https://github.com/cotes2020/jekyll-theme-chirpy
- * © 2018-2019 Cotes Chung
- * MIT License
  */
 
 $(function() {
 
-  var didScroll;
+  const topbarWrapper = $("#topbar-wrapper");
-  var lastScrollTop = 0;
+  const toc = $("#toc-wrapper");
-  var delta = 5;
+  const access = $(".access");
-  var topbarHeight = $("#topbar-wrapper").outerHeight();
+  const searchInput = $("#search-input");
+
+  let didScroll;
+  let lastScrollTop = 0;
+
+  const delta = 5;
+  const topbarHeight = topbarWrapper.outerHeight();
 
   function hasScrolled() {
     var st = $(this).scrollTop();
@@ -23,30 +25,28 @@ $(function() {
 
     if (st > lastScrollTop && st > topbarHeight) {
       /* Scroll Down */
-      $("#topbar-wrapper").removeClass("topbar-down").addClass("topbar-up");
+      topbarWrapper.removeClass("topbar-down").addClass("topbar-up");
 
-      if ($("#toc-wrapper").length > 0) {
+      if (toc.length > 0) {
-        $("#toc-wrapper").removeClass("topbar-down");
+        toc.removeClass("topbar-down");
       }
 
-      if ($(".access").length > 0) {
+      if (access.length > 0) {
-        $(".access").removeClass("topbar-down");
+        access.removeClass("topbar-down");
       }
 
-      if ($("#search-input").is(":focus")) {
+      if (searchInput.is(":focus")) {
-        $("#search-input").blur(); /* remove focus */
+        searchInput.blur(); /* remove focus */
       }
 
-    } else {
+    } else if (st + $(window).height() < $(document).height()) {
       /* Scroll Up */
-      if (st + $(window).height() < $(document).height()) {
+      topbarWrapper.removeClass("topbar-up").addClass("topbar-down");
-        $("#topbar-wrapper").removeClass("topbar-up").addClass("topbar-down");
+      if (toc.length > 0) {
-        if ($("#toc-wrapper").length > 0) {
+        toc.addClass("topbar-down");
-          $("#toc-wrapper").addClass("topbar-down");
+      }
-        }
+      if (access.length > 0) {
-        if ($(".access").length > 0) {
+        access.addClass("topbar-down");
-          $(".access").addClass("topbar-down");
-        }
       }
     }
 
@@ -66,4 +66,4 @@ $(function() {
     }
   }, 250);
 
-});
+});

assets/js/_commons/topbar-title.js

@@ -1,16 +1,16 @@
 /*
- * Topbar title auto change while scrolling in mobile screens.
+ * Top bar title auto change while scrolling in mobile screens.
- * v2.0
- * https://github.com/cotes2020/jekyll-theme-chirpy
- * © 2018-2019 Cotes Chung
- * MIT License
 */
 
 $(function() {
 
-  var DEFAULT = $("#topbar-title").text().trim();
+  const topbarTitle = $("#topbar-title");
-  var title = ($("div.post>h1").length > 0) ?
+  const postTitle = $("div.post>h1");
-          $("div.post>h1").text().trim() : $("h1").text().trim();
+
+  const DEFAULT = topbarTitle.text().trim();
+
+  let title = (postTitle.length > 0) ?
+    postTitle.text().trim() : $("h1").text().trim();
 
   if ($("#page-category").length || $("#page-tag").length) {
     /* The title in Category or Tag page will be "<title> <count_of_posts>" */
@@ -22,26 +22,26 @@ $(function() {
   /* Replace topbar title while scroll screens. */
   $(window).scroll(function () {
     if ($("#post-list").length /* in Home page */
-      || $("div.post>h1").is(":hidden") /* is tab pages */
+      || postTitle.is(":hidden") /* is tab pages */
-      || $("#topbar-title").is(":hidden") /* not mobile screens */
+      || topbarTitle.is(":hidden") /* not mobile screens */
       || $("#sidebar.sidebar-expand").length) { /* when the sidebar trigger is clicked */
       return false;
     }
 
     if ($(this).scrollTop() >= 95) {
-      if ($("#topbar-title").text() !== title) {
+      if (topbarTitle.text() !== title) {
-        $("#topbar-title").text(title);
+        topbarTitle.text(title);
       }
     } else {
-      if ($("#topbar-title").text() !== DEFAULT) {
+      if (topbarTitle.text() !== DEFAULT) {
-        $("#topbar-title").text(DEFAULT);
+        topbarTitle.text(DEFAULT);
       }
     }
   });
 
   /* Click title remove hover effect. */
-  $("#topbar-title").click(function() {
+  topbarTitle.click(function() {
     $("body,html").animate({scrollTop: 0}, 800);
   });
 
-});
+});

assets/js/_home-post.js

@@ -1,22 +0,0 @@
-/*!
-  JS group for layout Home or Post
-  Chirpy v2.3
-  https://github.com/cotes2020/jekyll-theme-chirpy
-  © 2020 Cotes Chung
-  MIT License
-*/
-
-{% include_relative _commons.js %}
-
-{% include_relative _utils/timeago.js %}
-
-
-{% if site.google_analytics.pv.enabled %}
-
-  {% include_relative _pv-config.js %}
-
-  {% include_relative _utils/pageviews.js %}
-
-  {% include_relative lib/_countUp.min.js %}
-
-{% endif %}

assets/js/_pv-config.js

@@ -1,14 +0,0 @@
-/*!
-  PV configuration and Javascript conversion.
-*/
-
-const proxyEndpoint = "{{ site.google_analytics.pv.proxy_endpoint }}";
-
-
-{% if site.google_analytics.pv.cache and site.google_analytics.pv.enabled %}
-  {% assign enabled = true %}
-{% else %}
-  {% assign enabled = false %}
-{% endif %}
-
-const pvCacheEnabled = {{ enabled }};

assets/js/_utils/category-collapse.js

@@ -1,33 +1,30 @@
 /*
  * Tab 'Categories' expand/close effect.
- * v2.0
- * https://github.com/cotes2020/jekyll-theme-chirpy
- * © 2018-2019 Cotes Chung
- * MIT License
  */
 
 $(function() {
-  var childPrefix = "l_";
+  const childPrefix = "l_";
-  var parentPrefix = "h_";
+  const parentPrefix = "h_";
+  const collapse = $(".collapse");
 
   /* close up top-category */
-  $(".collapse").on("hide.bs.collapse", function() { /* Bootstrap collapse events. */
+  collapse.on("hide.bs.collapse", function () { /* Bootstrap collapse events. */
-    var parentId = parentPrefix + $(this).attr("id").substring(childPrefix.length);
+    const parentId = parentPrefix + $(this).attr("id").substring(childPrefix.length);
     if (parentId) {
-      $("#" + parentId + " .far.fa-folder-open").attr("class", "far fa-folder fa-fw");
+      $(`#${parentId} .far.fa-folder-open`).attr("class", "far fa-folder fa-fw");
-      $("#" + parentId + " i.fas").addClass("rotate");
+      $(`#${parentId} i.fas`).addClass("rotate");
-      $("#" + parentId).removeClass("hide-border-bottom");
+      $(`#${parentId}`).removeClass("hide-border-bottom");
     }
   });
 
   /* expand the top category */
-  $(".collapse").on("show.bs.collapse", function() {
+  collapse.on("show.bs.collapse", function() {
-    var parentId = parentPrefix + $(this).attr("id").substring(childPrefix.length);
+    const parentId = parentPrefix + $(this).attr("id").substring(childPrefix.length);
     if (parentId) {
-      $("#" + parentId + " .far.fa-folder").attr("class", "far fa-folder-open fa-fw");
+      $(`#${parentId} .far.fa-folder`).attr("class", "far fa-folder-open fa-fw");
-      $("#" + parentId + " i.fas").removeClass("rotate");
+      $(`#${parentId} i.fas`).removeClass("rotate");
-      $("#" + parentId).addClass("hide-border-bottom");
+      $(`#${parentId}`).addClass("hide-border-bottom");
     }
   });
 
-});
+});

assets/js/_utils/img-hyperlink.js

@@ -1,16 +1,8 @@
 /*
  * Find out the <a> tag contains an image and mark it.
- *
- * v2.5.1
- * https://github.com/cotes2020/jekyll-theme-chirpy
- * © 2020 Cotes Chung
- * MIT Licensed
  */
 
 $(function() {
-
+  const MARK = "img-hyperlink";
-  var MARK="img-hyperlink";
-
   $("a:has(img)").addClass(MARK);
-  
 });

assets/js/_utils/lang-badge.js

@@ -7,11 +7,11 @@ $(function() {
   const regex = new RegExp(`^${prefix}([a-z])+$`);
 
   $(`div[class^=${prefix}`).each(function() {
-    let clzsses = $(this).attr("class").split(" ");
+    let classes = $(this).attr("class").split(" ");
 
-    clzsses.forEach((clzss) => {
+    classes.forEach((_class) => {
-      if (regex.test(clzss)) {
+      if (regex.test(_class)) {
-        let lang = clzss.substring(prefix.length);
+        let lang = _class.substring(prefix.length);
         $(this).attr("lang", `${lang}`);
       }
     });

assets/js/_utils/pageviews.js

@@ -1,18 +1,13 @@
-/**
+/*
- * Count pageviews form GA or local cache file.
+ * Count page views form GA or local cache file.
  *
- * Dependences:
+ * Dependencies:
  *   - jQuery
  *   - countUp.js <https://github.com/inorganik/countUp.js>
- *
- * v2.0
- * https://github.com/cotes2020/jekyll-theme-chirpy
- * © 2018-2019 Cotes Chung
- * MIT License
  */
 
-var getInitStatus = (function () {
+const getInitStatus = (function () {
-  var hasInit = false;
+  let hasInit = false;
   return () => {
     let ret = hasInit;
     if (!hasInit) {
@@ -22,13 +17,26 @@ var getInitStatus = (function () {
   };
 }());
 
+const PvOpts = (function () {
+  return {
+    isEnabled() {
+      return "true" === $("meta[name=pv-cache-enabled]").attr("content");
+    },
+    getProxyEndpoint() {
+      return $("meta[name=pv-proxy-endpoint]").attr("content");
+    },
+    getLocalData() {
+      return $("meta[name=pv-cache-data]").attr("content");
+    }
+  }
+}());
 
-var PvCache = (function () {
+const PvCache = (function () {
   const KEY_PV = "pv";
   const KEY_CREATION = "pv_created_date";
   const KEY_PV_SRC = "pv_source";
 
-  var Source = {
+  const Source = {
     ORIGIN: "origin",
     PROXY: "proxy"
   };
@@ -43,17 +51,18 @@ var PvCache = (function () {
 
   return {
     getData() {
-      return JSON.parse(localStorage.getItem(KEY_PV) );
+      // get data from browser cache
+      return JSON.parse(localStorage.getItem(KEY_PV));
     },
     saveOriginCache(pv) {
       set(KEY_PV, pv);
-      set(KEY_PV_SRC, Source.ORIGIN );
+      set(KEY_PV_SRC, Source.ORIGIN);
-      set(KEY_CREATION, new Date().toJSON() );
+      set(KEY_CREATION, new Date().toJSON());
     },
     saveProxyCache(pv) {
       set(KEY_PV, pv);
-      set(KEY_PV_SRC, Source.PROXY );
+      set(KEY_PV_SRC, Source.PROXY);
-      set(KEY_CREATION, new Date().toJSON() );
+      set(KEY_CREATION, new Date().toJSON());
     },
     isFromOrigin() {
       return get(KEY_PV_SRC) === Source.ORIGIN;
@@ -62,23 +71,23 @@ var PvCache = (function () {
       return get(KEY_PV_SRC) === Source.PROXY;
     },
     isExpired() {
-      if (PvCache.isFromOrigin() ) {
+      if (PvCache.isFromOrigin()) {
         let date = new Date(get(KEY_CREATION));
         date.setDate(date.getDate() + 1); /* update origin records every day */
         return Date.now() >= date.getTime();
 
-      } else if (PvCache.isFromProxy() ) {
+      } else if (PvCache.isFromProxy()) {
-        let date = new Date(get(KEY_CREATION) );
+        let date = new Date(get(KEY_CREATION));
         date.setHours(date.getHours() + 1); /* update proxy records per hour */
         return Date.now() >= date.getTime();
       }
       return false;
     },
-    getAllPagevies() {
+    getAllPageviews() {
       return PvCache.getData().totalsForAllResults["ga:pageviews"];
     },
     newerThan(pv) {
-      return PvCache.getAllPagevies() > pv.totalsForAllResults["ga:pageviews"];
+      return PvCache.getAllPageviews() > pv.totalsForAllResults["ga:pageviews"];
     },
     inspectKeys() {
       if (localStorage.getItem(KEY_PV) === null
@@ -91,9 +100,10 @@ var PvCache = (function () {
 
 }()); /* PvCache */
 
+
 function countUp(min, max, destId) {
   if (min < max) {
-    var numAnim = new CountUp(destId, min, max);
+    let numAnim = new CountUp(destId, min, max);
     if (!numAnim.error) {
       numAnim.start();
     } else {
@@ -104,11 +114,11 @@ function countUp(min, max, destId) {
 
 
 function countPV(path, rows) {
-  var count = 0;
+  let count = 0;
 
   if (typeof rows !== "undefined" ) {
-    for (var i = 0; i < rows.length; ++i) {
+    for (let i = 0; i < rows.length; ++i) {
-      var gaPath = rows[parseInt(i, 10)][0];
+      const gaPath = rows[parseInt(i, 10)][0];
       if (gaPath === path) { /* path format see: site.permalink */
         count += parseInt(rows[parseInt(i, 10)][1], 10);
         break;
@@ -121,13 +131,13 @@ function countPV(path, rows) {
 
 
 function tacklePV(rows, path, elem, hasInit) {
-  var count = countPV(path, rows);
+  let count = countPV(path, rows);
   count = (count === 0 ? 1 : count);
 
   if (!hasInit) {
     elem.text(new Intl.NumberFormat().format(count));
   } else {
-    var initCount = parseInt(elem.text().replace(/,/g, ""), 10);
+    const initCount = parseInt(elem.text().replace(/,/g, ""), 10);
     if (count > initCount) {
       countUp(initCount, count, elem.attr("id"));
     }
@@ -140,17 +150,17 @@ function displayPageviews(data) {
     return;
   }
 
-  var hasInit = getInitStatus();
+  let hasInit = getInitStatus();
-  var rows = data.rows; /* could be undefined */
+  const rows = data.rows; /* could be undefined */
 
   if ($("#post-list").length > 0) { /* the Home page */
     $(".post-preview").each(function() {
-      var path = $(this).find("a").attr("href");
+      const path = $(this).find("a").attr("href");
       tacklePV(rows, path, $(this).find(".pageviews"), hasInit);
     });
 
   } else if ($(".post").length > 0) { /* the post */
-    var path = window.location.pathname;
+    const path = window.location.pathname;
     tacklePV(rows, path, $("#pv"), hasInit);
   }
 }
@@ -159,7 +169,7 @@ function displayPageviews(data) {
 function fetchProxyPageviews() {
   $.ajax({
     type: "GET",
-    url: proxyEndpoint, /* see: /assets/js/_pv-config.js */
+    url: PvOpts.getProxyEndpoint(),
     dataType: "jsonp",
     jsonpCallback: "displayPageviews",
     success: (data, textStatus, jqXHR) => {
@@ -173,9 +183,8 @@ function fetchProxyPageviews() {
 
 
 function fetchPageviews(fetchOrigin = true, filterOrigin = false) {
-  /* pvCacheEnabled › see: /assets/js/_pv-config.js */
+  if (PvOpts.isEnabled() && fetchOrigin) {
-  if (pvCacheEnabled && fetchOrigin) {
+    fetch(PvOpts.getLocalData())
-    fetch("/assets/js/data/pageviews.json")
       .then((response) => response.json())
       .then((data) => {
         if (filterOrigin) {
@@ -196,9 +205,7 @@ function fetchPageviews(fetchOrigin = true, filterOrigin = false) {
 
 
 $(function() {
-
   if ($(".pageviews").length > 0) {
-
     PvCache.inspectKeys();
     let cache = PvCache.getData();
 

assets/js/_utils/smooth-scroll.js

@@ -1,6 +1,6 @@
 /*
   Safari doesn't support CSS `scroll-behavior: smooth`,
-  so here is a compatible sollution for all browser to smooth scrolling
+  so here is a compatible solution for all browser to smooth scrolling
 
   See: <https://css-tricks.com/snippets/jquery/smooth-scrolling/>
 
@@ -13,66 +13,67 @@ $(function() {
     .not("[href='#0']")
     .click(function(event) {
 
-      if (location.pathname.replace(/^\//, "") === this.pathname.replace(/^\//, "")
+      if (this.pathname.replace(/^\//, "") === location.pathname.replace(/^\//, "")) {
-        && location.hostname === this.hostname) {
+        if (location.hostname === this.hostname) {
 
-        const REM = 16; /* 16px */
+          const REM = 16; /* 16px */
 
-        const hash = decodeURI(this.hash);
+          const hash = decodeURI(this.hash);
-        let isFnRef = RegExp(/^#fnref:/).test(hash);
+          let isFnRef = RegExp(/^#fnref:/).test(hash);
-        let isFn = RegExp(/^#fn:/).test(hash);
+          let isFn = RegExp(/^#fn:/).test(hash);
-        let selector = hash.includes(":") ? hash.replace(/\:/, "\\:") : hash;
+          let selector = hash.includes(":") ? hash.replace(/\:/, "\\:") : hash;
-        const target = $(selector);
+          let target = $(selector);
 
-        if (target.length) {
+          if (target.length) {
-          event.preventDefault();
+            event.preventDefault();
 
-          if (history.pushState) { /* add hash to URL */
+            if (history.pushState) { /* add hash to URL */
-            history.pushState(null, null, hash);
+              history.pushState(null, null, hash);
+            }
+
+            let curOffset = $(this).offset().top;
+            let destOffset = target.offset().top;
+            const scrollUp = (destOffset < curOffset);
+            const topbarHeight = $("#topbar-wrapper").outerHeight();
+
+            if (scrollUp && isFnRef) {
+              /* Avoid the top-bar covering `fnref` when scrolling up
+                because `fnref` has no `%anchor`(see: module.scss) style. */
+              destOffset -= (topbarHeight + REM / 2);
+            }
+
+            $("html,body").animate({
+              scrollTop: destOffset
+            }, 800, () => {
+
+              const $target = $(target);
+              $target.focus();
+
+              const SCROLL_MARK = "scroll-focus";
+
+              /* clean up old scroll mark */
+              if ($(`[${SCROLL_MARK}=true]`).length) {
+                $(`[${SCROLL_MARK}=true]`).attr(SCROLL_MARK, false);
+              }
+
+              /* Clean :target links */
+              if ($(":target").length) { /* element that visited by the URL with hash */
+                $(":target").attr(SCROLL_MARK, false);
+              }
+
+              /* set scroll mark to footnotes */
+              if (isFn || isFnRef) {
+                $target.attr(SCROLL_MARK, true);
+              }
+
+              if ($target.is(":focus")) { /* Checking if the target was focused */
+                return false;
+              } else {
+                $target.attr("tabindex", "-1"); /* Adding tabindex for elements not focusable */
+                $target.focus(); /* Set focus again */
+              }
+            });
           }
-
-          let curOffset = $(this).offset().top;
-          let destOffset = target.offset().top;
-          const scrollUp = (destOffset < curOffset);
-          const topbarHeight = $("#topbar-wrapper").outerHeight();
-
-          if (scrollUp && isFnRef) {
-            /* Avoid the top-bar covering `fnref` when scrolling up
-              because `fnref` has no `%anchor`(see: module.scss) style. */
-            destOffset -= (topbarHeight + REM / 2);
-          }
-
-          $("html,body").animate({
-            scrollTop: destOffset
-          }, 800, () => {
-
-            var $target = $(target);
-            $target.focus();
-
-            const SCROLL_MARK = "scroll-focus";
-
-            /* clean up old scroll mark */
-            if ($(`[${ SCROLL_MARK }=true]`).length) {
-              $(`[${ SCROLL_MARK }=true]`).attr(SCROLL_MARK, false);
-            }
-
-            /* Clean :target links */
-            if ($(":target").length) { /* element that visited by the URL with hash */
-              $(":target").attr(SCROLL_MARK, false);
-            }
-
-            /* set scroll mark to footnotes */
-            if (isFn || isFnRef) {
-              $target.attr(SCROLL_MARK, true);
-            }
-
-            if ($target.is(":focus")) { /* Checking if the target was focused */
-              return false;
-            } else {
-              $target.attr("tabindex", "-1"); /* Adding tabindex for elements not focusable */
-              $target.focus(); /* Set focus again */
-            }
-          });
         }
       }
 

assets/js/_utils/timeago.js

@@ -1,16 +1,14 @@
 /*
- * Caculate the Timeago
+ * Calculate the Timeago
- * v2.0
- * https://github.com/cotes2020/jekyll-theme-chirpy
- * © 2019 Cotes Chung
- * MIT Licensed
  */
 
 $(function() {
 
-  var toRefresh = $(".timeago").length;
+  const timeagoElem = $(".timeago");
 
-  var intervalId = void 0;
+  let toRefresh = timeagoElem.length;
+
+  let intervalId = void 0;
 
   function timeago(iso, isLastmod) {
     let now = new Date();
@@ -57,10 +55,10 @@ $(function() {
   function updateTimeago() {
     $(".timeago").each(function() {
       if ($(this).children("i").length > 0) {
-        var basic = $(this).text();
+        $(this).text();
-        var isLastmod = $(this).hasClass("lastmod");
+        let isLastmod = $(this).hasClass("lastmod");
-        var node = $(this).children("i");
+        let node = $(this).children("i");
-        var date = node.text(); /* ISO Date: "YYYY-MM-DDTHH:MM:SSZ" */
+        let date = node.text(); /* ISO Date: "YYYY-MM-DDTHH:MM:SSZ" */
         $(this).text(timeago(date, isLastmod));
         $(this).append(node);
       }

assets/js/categories.min.js

@@ -1,13 +0,0 @@
----
-layout: compress
-
-# JS for layout tab Categories.
-# Chirpy v2.3
-# https://github.com/cotes2020/jekyll-theme-chirpy
-# © 2020 Cotes Chung
-# MIT License
----
-
-{% include_relative _commons.js %}
-
-{% include_relative _utils/category-collapse.js %}