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require 'uri'
module Banzai
module Filter
# HTML filter that "fixes" relative links to files in a repository.
#
# Context options:
# :project_wiki
class WikiLinkFilter < HTML::Pipeline::Filter
def call
return doc unless project_wiki?
doc.search('a:not(.gfm)').each do |el|
process_link_attr el.attribute('href')
end
doc
end
protected
def project_wiki?
!context[:project_wiki].nil?
end
def process_link_attr(html_attr)
return if html_attr.blank? || file_reference?(html_attr) || hierarchical_link?(html_attr)
uri = URI(html_attr.value)
if uri.relative? && uri.path.present?
html_attr.value = rebuild_wiki_uri(uri).to_s
end
rescue URI::Error
# noop
end
def rebuild_wiki_uri(uri)
uri.path = ::File.join(project_wiki_base_path, uri.path)
uri
end
def project_wiki
context[:project_wiki]
end
def file_reference?(html_attr)
!File.extname(html_attr.value).blank?
end
# Of the form `./link`, `../link`, or similar
def hierarchical_link?(html_attr)
html_attr.value[0] == '.'
end
def project_wiki_base_path
project_wiki && project_wiki.wiki_base_path
end
end
end
end
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