rubocop fixes

Gemfile

@@ -1,4 +1,6 @@
-source "https://rubygems.org"
+# frozen_string_literal: true
+
+source 'https://rubygems.org'
 # Hello! This is where you manage which Jekyll version is used to run.
 # When you want to use a different version, change it below, save the
 # file and run `bundle install`. Run Jekyll with `bundle exec`, like so:
@@ -7,28 +9,27 @@ source "https://rubygems.org"
 #
 # This will help ensure the proper Jekyll version is running.
 # Happy Jekylling!
-gem "jekyll", "~> 4.2.0"
+gem 'jekyll', '~> 4.2.0'
 # This is the default theme for new Jekyll sites. You may change this to anything you like.
 # If you want to use GitHub Pages, remove the "gem "jekyll"" above and
 # uncomment the line below. To upgrade, run `bundle update github-pages`.
 # gem "github-pages", group: :jekyll_plugins
 # If you have any plugins, put them here!
 group :jekyll_plugins do
-  gem "jekyll-feed", git: "https://github.com/hyphacoop/jekyll-feed"
-  gem "jekyll-last-modified-at", "~> 1.3"
+  gem 'jekyll-feed', git: 'https://github.com/hyphacoop/jekyll-feed'
+  gem 'jekyll-last-modified-at', '~> 1.3'
 end
 
 # Windows and JRuby does not include zoneinfo files, so bundle the tzinfo-data gem
 # and associated library.
 platforms :mingw, :x64_mingw, :mswin, :jruby do
-  gem "tzinfo", "~> 1.2"
-  gem "tzinfo-data"
+  gem 'tzinfo', '~> 1.2'
+  gem 'tzinfo-data'
 end
 
 # Performance-booster for watching directories on Windows
-gem "wdm", "~> 0.1.1", :platforms => [:mingw, :x64_mingw, :mswin]
+gem 'wdm', '~> 0.1.1', platforms: %i[mingw x64_mingw mswin]
 
+gem 'html-proofer', '~> 3.18'
 
-gem "html-proofer", "~> 3.18"
-
-gem "rake", "~> 13.0"
+gem 'rake', '~> 13.0'

Gemfile.lock

@@ -62,6 +62,10 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.4.0)
+    mini_portile2 (2.5.0)
+    nokogiri (1.11.1)
+      mini_portile2 (~> 2.5.0)
+      racc (~> 1.4)
     nokogiri (1.11.1-x86_64-darwin)
       racc (~> 1.4)
     nokogiri (1.11.1-x86_64-linux)
@@ -92,6 +96,7 @@ GEM
     yell (2.2.2)
 
 PLATFORMS
+  ruby
   x86_64-darwin-19
   x86_64-linux
 

_plugins/bidirectional_links_generator.rb

@@ -1,4 +1,6 @@
 # frozen_string_literal: true
+
+# Generate bi-directional links from a given collection and the nodes graph.
 class BidirectionalLinksGenerator < Jekyll::Generator
   def generate(site)
     graph_nodes = []
@@ -9,7 +11,7 @@ class BidirectionalLinksGenerator < Jekyll::Generator
 
     all_docs = all_notes + all_pages
 
-    link_extension = !!site.config["use_html_extension"] ? '.html' : ''
+    link_extension = site.config['use_html_extension'] ? '.html' : ''
 
     # Convert all Wiki/Roam-style double-bracket link syntax to plain HTML
     # anchor tag elements (<a>) with "internal-link" CSS class
@@ -74,11 +76,13 @@ class BidirectionalLinksGenerator < Jekyll::Generator
       end
 
       # Nodes: Graph
-      graph_nodes << {
-        id: note_id_from_note(current_note),
-        path: "#{site.baseurl}#{current_note.url}#{link_extension}",
-        label: current_note.data['title'],
-      } unless current_note.path.include?('_notes/index.html')
+      unless current_note.path.include?('_notes/index.html')
+        graph_nodes << {
+          id: note_id_from_note(current_note),
+          path: "#{site.baseurl}#{current_note.url}#{link_extension}",
+          label: current_note.data['title']
+        }
+      end
 
       # Edges: Jekyll
       current_note.data['backlinks'] = notes_linking_to_current_note
@@ -87,23 +91,23 @@ class BidirectionalLinksGenerator < Jekyll::Generator
       notes_linking_to_current_note.each do |n|
         graph_edges << {
           source: note_id_from_note(n),
-          target: note_id_from_note(current_note),
+          target: note_id_from_note(current_note)
         }
       end
     end
 
     File.write('_includes/notes_graph.json', JSON.dump({
-      edges: graph_edges,
-      nodes: graph_nodes,
-    }))
+                                                         edges: graph_edges,
+                                                         nodes: graph_nodes
+                                                       }))
   end
 
   def note_id_from_note(note)
     note.data['title']
-      .dup
-      .gsub(/\W+/, ' ')
-      .delete(' ')
-      .to_i(36)
-      .to_s
+        .dup
+        .gsub(/\W+/, ' ')
+        .delete(' ')
+        .to_i(36)
+        .to_s
   end
-end
+end

_plugins/empty_front_matter_note_injector.rb

@@ -8,7 +8,7 @@ JEKYLL
 
 # Inject empty front matter in notes that don't have any
 Jekyll::Hooks.register :site, :after_init do |site|
-  Dir.glob(site.collections['notes'].relative_directory + '/**/*.md').each do |filename|
+  Dir.glob("#{site.collections['notes'].relative_directory}/**/*.md").each do |filename|
     raw_note_content = File.read(filename)
     unless raw_note_content.start_with?('---')
       raw_note_content.prepend(EMPTY_FRONT_MATTER)