112 lines
3.7 KiB
Ruby
112 lines
3.7 KiB
Ruby
# frozen_string_literal: true
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class BidirectionalLinksGenerator < Jekyll::Generator
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def generate(site)
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graph_nodes = []
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graph_edges = []
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all_notes = site.collections['notes'].docs
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all_pages = site.pages
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all_docs = all_notes + all_pages
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link_extension = !!site.config["use_html_extension"] ? '.html' : ''
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# Convert all Wiki/Roam-style double-bracket link syntax to plain HTML
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# anchor tag elements (<a>) with "internal-link" CSS class
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all_docs.each do |current_note|
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all_docs.each do |note_potentially_linked_to|
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note_title_regexp_pattern = Regexp.escape(
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File.basename(
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note_potentially_linked_to.basename,
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File.extname(note_potentially_linked_to.basename)
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)
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).gsub('\_', '[ _]').gsub('\-', '[ -]').capitalize
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title_from_data = note_potentially_linked_to.data['title']
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if title_from_data
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title_from_data = Regexp.escape(title_from_data)
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end
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new_href = "#{site.baseurl}#{note_potentially_linked_to.url}#{link_extension}"
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anchor_tag = "<a class='internal-link' href='#{new_href}'>\\1</a>"
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# Replace double-bracketed links with label using note title
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# [[A note about cats|this is a link to the note about cats]]
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current_note.content.gsub!(
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/\[\[#{note_title_regexp_pattern}\|(.+?)(?=\])\]\]/i,
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anchor_tag
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)
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# Replace double-bracketed links with label using note filename
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# [[cats|this is a link to the note about cats]]
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current_note.content.gsub!(
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/\[\[#{title_from_data}\|(.+?)(?=\])\]\]/i,
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anchor_tag
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)
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# Replace double-bracketed links using note title
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# [[a note about cats]]
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current_note.content.gsub!(
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/\[\[(#{title_from_data})\]\]/i,
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anchor_tag
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)
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# Replace double-bracketed links using note filename
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# [[cats]]
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current_note.content.gsub!(
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/\[\[(#{note_title_regexp_pattern})\]\]/i,
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anchor_tag
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)
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end
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# At this point, all remaining double-bracket-wrapped words are
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# pointing to non-existing pages, so let's turn them into disabled
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# links by greying them out and changing the cursor
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current_note.content = current_note.content.gsub(
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/\[\[([^\]]+)\]\]/i, # match on the remaining double-bracket links
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<<~HTML.delete("\n") # replace with this HTML (\\1 is what was inside the brackets)
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<span title='There is no note that matches this link.' class='invalid-link'>
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<span class='invalid-link-brackets'>[[</span>
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\\1
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<span class='invalid-link-brackets'>]]</span></span>
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HTML
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)
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end
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# Identify note backlinks and add them to each note
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all_notes.each do |current_note|
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# Nodes: Jekyll
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notes_linking_to_current_note = all_notes.filter do |e|
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e.content.include?(current_note.url)
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end
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# Nodes: Graph
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graph_nodes << {
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id: note_id_from_note(current_note),
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path: "#{site.baseurl}#{current_note.url}#{link_extension}",
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label: current_note.data['title'],
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} unless current_note.path.include?('_notes/index.html')
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# Edges: Jekyll
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current_note.data['backlinks'] = notes_linking_to_current_note
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# Edges: Graph
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notes_linking_to_current_note.each do |n|
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graph_edges << {
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source: note_id_from_note(n),
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target: note_id_from_note(current_note),
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}
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end
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end
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File.write('_includes/notes_graph.json', JSON.dump({
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edges: graph_edges,
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nodes: graph_nodes,
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}))
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end
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def note_id_from_note(note)
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note.data['title'].bytes.join
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end
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end
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