upgrade to Jekyll 4jekyll4

The jekyll-github-metadata bug has finally been fixed.

6 files changed, 43 insertions, 45 deletions

diff --git a/.gitignore b/.gitignore
index 921f829..218813a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
+/.jekyll-cache/
 /_site/
 /.wget/
diff --git a/Gemfile b/Gemfile
index 2dd10aa..81d0077 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,12 +1,6 @@
 source 'https://rubygems.org'
-gem 'jekyll', '~> 3'
+gem 'jekyll', '~> 4'
 
 gem 'jekyll-github-metadata'
 gem 'jekyll-paginate'
 gem 'jekyll-tidy'
-
-# Jekyll 3.9.0 requires this as an explicit dependency:
-gem 'kramdown-parser-gfm'
-
-# Jekyll 3.9.2 requires this as an explicit dependency for Ruby 3:
-gem 'webrick'
diff --git a/Gemfile.lock b/Gemfile.lock
index 7e3f0f8..63b6793 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,44 +1,49 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.8.1)
+    addressable (2.8.4)
       public_suffix (>= 2.0.2, < 6.0)
     colorator (1.1.0)
-    concurrent-ruby (1.1.10)
+    concurrent-ruby (1.2.2)
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)
     eventmachine (1.2.7)
-    faraday (2.6.0)
+    faraday (2.7.5)
       faraday-net_http (>= 2.0, < 3.1)
       ruby2_keywords (>= 0.0.4)
-    faraday-net_http (3.0.1)
+    faraday-net_http (3.0.2)
     ffi (1.15.5)
     forwardable-extended (2.6.0)
+    google-protobuf (3.23.2-arm64-darwin)
+    google-protobuf (3.23.2-x86_64-linux)
     htmlbeautifier (1.4.2)
     htmlcompressor (0.4.0)
     http_parser.rb (0.8.0)
-    i18n (0.9.5)
+    i18n (1.14.1)
       concurrent-ruby (~> 1.0)
-    jekyll (3.9.2)
+    jekyll (4.3.2)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
-      i18n (~> 0.7)
-      jekyll-sass-converter (~> 1.0)
+      i18n (~> 1.0)
+      jekyll-sass-converter (>= 2.0, < 4.0)
       jekyll-watch (~> 2.0)
-      kramdown (>= 1.17, < 3)
+      kramdown (~> 2.3, >= 2.3.1)
+      kramdown-parser-gfm (~> 1.0)
       liquid (~> 4.0)
-      mercenary (~> 0.3.3)
+      mercenary (>= 0.3.6, < 0.5)
       pathutil (~> 0.9)
-      rouge (>= 1.7, < 4)
+      rouge (>= 3.0, < 5.0)
       safe_yaml (~> 1.0)
-    jekyll-github-metadata (2.15.0)
+      terminal-table (>= 1.8, < 4.0)
+      webrick (~> 1.7)
+    jekyll-github-metadata (2.16.0)
       jekyll (>= 3.4, < 5.0)
-      octokit (~> 4.0, != 4.4.0)
+      octokit (>= 4, < 7, != 4.4.0)
     jekyll-paginate (1.1.0)
-    jekyll-sass-converter (1.5.2)
-      sass (~> 3.4)
+    jekyll-sass-converter (3.0.0)
+      sass-embedded (~> 1.54)
     jekyll-tidy (0.2.2)
       htmlbeautifier
       htmlcompressor
@@ -49,44 +54,45 @@ GEM
       rexml
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
-    liquid (4.0.3)
-    listen (3.7.1)
+    liquid (4.0.4)
+    listen (3.8.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
-    mercenary (0.3.6)
-    octokit (4.25.1)
+    mercenary (0.4.0)
+    octokit (6.1.1)
       faraday (>= 1, < 3)
       sawyer (~> 0.9)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
-    public_suffix (5.0.0)
+    public_suffix (5.0.1)
+    rake (13.0.6)
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     rexml (3.2.5)
-    rouge (3.30.0)
+    rouge (4.1.2)
     ruby2_keywords (0.0.5)
     safe_yaml (1.0.5)
-    sass (3.7.4)
-      sass-listen (~> 4.0.0)
-    sass-listen (4.0.0)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
+    sass-embedded (1.62.1)
+      google-protobuf (~> 3.21)
+      rake (>= 10.0.0)
     sawyer (0.9.2)
       addressable (>= 2.3.5)
       faraday (>= 0.17.3, < 3)
-    webrick (1.7.0)
+    terminal-table (3.0.2)
+      unicode-display_width (>= 1.1.1, < 3)
+    unicode-display_width (2.4.2)
+    webrick (1.8.1)
 
 PLATFORMS
+  arm64-darwin-21
   x86_64-linux
 
 DEPENDENCIES
-  jekyll (~> 3)
+  jekyll (~> 4)
   jekyll-github-metadata
   jekyll-paginate
   jekyll-tidy
-  kramdown-parser-gfm
-  webrick
 
 BUNDLED WITH
    2.3.23
diff --git a/_config.yml b/_config.yml
index 579c128..64cac30 100644
--- a/_config.yml
+++ b/_config.yml
@@ -7,11 +7,8 @@ show_drafts: true
 strict_front_matter: true
 
 exclude:
-  - Gemfile
-  - Gemfile.lock
   - Makefile
   - README.md
-  - vendor/
 
 defaults:
   - scope:
diff --git a/_posts/2021-04-10-collapsible.md b/_posts/2021-04-10-collapsible.md
index cfa6be8..1907142 100644
--- a/_posts/2021-04-10-collapsible.md
+++ b/_posts/2021-04-10-collapsible.md
@@ -15,7 +15,7 @@ snippets:
 Snippets are defined in exactly the same way as in the [other post].
 Just set a front matter value to make them collapsible, and voilà!
 
-[other post]: {{ site.baseurl }}{% post_url 2021-04-09-snippets %}
+[other post]: {% post_url 2021-04-09-snippets %}
 
 {% include jekyll-theme/snippets/section.html section_id='hello' %}
 
diff --git a/index.md b/index.md
index 24f9146..6cdd755 100644
--- a/index.md
+++ b/index.md
@@ -20,18 +20,18 @@ navbar:
     <h4 class="list-group-item-heading">categories</h4>
     <p class="list-group-item-text">List of post categories (includes links to each category's page)</p>
   </a>
-  <a href="{{ site.baseurl }}{% post_url 2021-04-09-snippets %}" class="list-group-item">
+  <a href="{% post_url 2021-04-09-snippets %}" class="list-group-item">
     <h4 class="list-group-item-heading">code snippets</h4>
     <p class="list-group-item-text">Easily include code snippets in your posts</p>
   </a>
-  <a href="{{ site.baseurl }}{% post_url 2021-04-10-collapsible %}" class="list-group-item">
+  <a href="{% post_url 2021-04-10-collapsible %}" class="list-group-item">
     <h4 class="list-group-item-heading">collapsible snippets</h4>
   </a>
-  <a href="{{ site.baseurl }}{% post_url 2022-03-21-shell %}" class="list-group-item">
+  <a href="{% post_url 2022-03-21-shell %}" class="list-group-item">
     <h4 class="list-group-item-heading">shell commands</h4>
     <p class="list-group-item-text">Clearly separate shell commands and their outputs from one another</p>
   </a>
-  <a href="{{ site.baseurl }}{% post_url 2021-04-08-mathjax %}" class="list-group-item">
+  <a href="{% post_url 2021-04-08-mathjax %}" class="list-group-item">
     <h4 class="list-group-item-heading">typesetting math</h4>
   </a>
 </div>