Add notes graph visualization

_plugins/bidirectional_links_generator.rb

@@ -1,6 +1,9 @@
 # frozen_string_literal: true
 class BidirectionalLinksGenerator < Jekyll::Generator
   def generate(site)
+    graph_nodes = []
+    graph_edges = []
+
     all_notes = site.collections['notes'].docs
     all_pages = site.pages
 
@@ -19,11 +22,37 @@ class BidirectionalLinksGenerator < Jekyll::Generator
 
     # Identify note backlinks and add them to each note
     all_notes.each do |current_note|
+			# Nodes: Jekyll
       notes_linking_to_current_note = all_notes.filter do |e|
         e.content.include?(current_note.url)
       end
 
+      # Nodes: Graph
+      graph_nodes << {
+        id: note_id_from_note(current_note),
+        path: current_note.url,
+        label: current_note.title,
+      } unless current_note.path.include?('_notes/index.html')
+
+			# Edges: Jekyll
       current_note.data['backlinks'] = notes_linking_to_current_note
+
+      # Edges: Graph
+      notes_linking_to_current_note.each do |n|
+        graph_edges << {
+          source: note_id_from_note(n),
+          target: note_id_from_note(current_note),
+        }
+      end
     end
+
+    File.write('_includes/notes_graph.json', JSON.dump({
+      edges: graph_edges,
+      nodes: graph_nodes,
+    }))
+  end
+
+  def note_id_from_note(note)
+    note.title.to_i(36).to_s
   end
 end