Differential D7437 Diff 23492 _plugins/markdown-override-broken-links.rb

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_plugins/markdown-override-broken-links.rb

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				require 'jekyll'
				require 'pathname'
				require 'uri'

				module Jekyll
				class MarkdownOverrideBrokenLinks < Generator
				attr_accessor :site, :config

				safe true
				priority :highest

				def generate(site)
				@site = site

				documents = site.pages

				documents.each do \|document\|
				next unless markdown_extension?(document.extname)
				next if document.is_a?(StaticFile)

				fix_broken_links(document)
				end
				end

				def fix_broken_links(doc)
				if doc.content.nil?()
				return
				end

				# Find all the links
				links = doc.content.scan(/(\[([^\]]+)\]\(([^ ")]+)[^)]*\))/)

				links.each do \|link\|
				original = link[0].strip()
				text = link[1].strip()
				url = link[2].strip()

				# The external links and local anchors will render valid
				next if is_valid_link?(url)

				# Relative links to markdown files will be converted by the
				# jekyll-relative-links plugin and are considered valid.
				# The plugin won't match the links relative to project root (starting
				# with a '/') if they are located in a subdirectory, so we need to fix
				# the link in this case.
				if is_markdown_link?(url)
				# Relative links don't need to be fixed
				next if !is_project_root_relative_link?(url)

				# Convert first both the link and the source markdown paths to absolute
				absolute_link = Pathname.new(get_doc_root(doc)).join(url[1..])
				absolute_doc_path = Pathname.new(site.source).join(doc.relative_path)

				# Now we can compute the link relative to the source markdown path
				relative_link = absolute_link.relative_path_from(absolute_doc_path.dirname()).to_s()

				doc.content.gsub!(original, "[#{text}](#{relative_link})")
				next
				end

				# Other links are broken, update them with "text (_url_)"
				doc.content.gsub!(original, "#{text} (`#{url}`)")
				end

				return
				end

				def get_doc_root(doc)
				doc_root = File.dirname(doc.relative_path)
				doc_root.slice!(File.dirname(doc.url))
				return File.join(site.source, doc_root)
				end

				def is_project_root_relative_link?(link_url)
				return link_url.start_with?("/")
				end

				def is_valid_link?(url)
				return is_external_link?(url) \|\| is_lone_anchor?(url)
				end

				def is_external_link?(link_url)
				uri = URI.parse(link_url)
				return !uri.scheme.nil?
				end

				def is_lone_anchor?(link_url)
				uri = URI.parse(link_url)
				return (uri.path.nil? \|\| uri.path.empty?) && !uri.fragment.nil?
				end

				def is_markdown_link?(link_url)
				uri = URI.parse(link_url)
				return uri.path.end_with?(".md")
				end

				def markdown_extension?(extension)
				markdown_converter.matches(extension)
				end

				def markdown_converter
				@markdown_converter \|\|= site.find_converter_instance(Converters::Markdown)
				end
				end
				end