kcl-digital-humanities-garden/_plugins/bidirectional_links_generator.rb

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2021-03-11 03:33:55 +00:00
# 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
all_docs = all_notes + all_pages
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
all_docs.each do |current_note|
all_docs.each do |note_potentially_linked_to|
title_from_filename = File.basename(
note_potentially_linked_to.basename,
File.extname(note_potentially_linked_to.basename)
).gsub('_', ' ').gsub('-', ' ').capitalize
# Replace double-bracketed links with label using note title
# [[A note about cats|this is a link to the note about cats]]
current_note.content = current_note.content.gsub(
/\[\[#{title_from_filename}\|(.+?)(?=\])\]\]/i,
"<a class='internal-link' href='.#{note_potentially_linked_to.url}#{link_extension}'>\\1</a>"
)
# Replace double-bracketed links with label using note filename
# [[cats|this is a link to the note about cats]]
current_note.content = current_note.content.gsub(
/\[\[#{note_potentially_linked_to.data['title']}\|(.+?)(?=\])\]\]/i,
"<a class='internal-link' href='.#{note_potentially_linked_to.url}#{link_extension}'>\\1</a>"
)
# Replace double-bracketed links using note title
# [[a note about cats]]
current_note.content = current_note.content.gsub(
/\[\[(#{note_potentially_linked_to.data['title']})\]\]/i,
"<a class='internal-link' href='.#{note_potentially_linked_to.url}#{link_extension}'>\\1</a>"
)
# Replace double-bracketed links using note filename
# [[cats]]
current_note.content = current_note.content.gsub(
/\[\[(#{title_from_filename})\]\]/i,
"<a class='internal-link' href='.#{note_potentially_linked_to.url}#{link_extension}'>\\1</a>"
)
end
# At this point, all remaining double-bracket-wrapped words are
# pointing to non-existing pages, so let's turn them into disabled
# links by greying them out and changing the cursor
current_note.content = current_note.content.gsub(
/\[\[(.*)\]\]/i, # match on the remaining double-bracket links
<<~HTML.chomp # replace with this HTML (\\1 is what was inside the brackets)
<span title='There is no note that matches this link.' class='invalid-link'>
<span class='invalid-link-brackets'>[[</span>
\\1
<span class='invalid-link-brackets'>]]</span></span>
HTML
)
end
# 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}#{link_extension}",
label: current_note.data['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.data['title']
.dup
.gsub(/\W+/, ' ')
.delete(' ')
.to_i(36)
.to_s
end
end