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require 'html/pipeline'
module Gitlab
module Markdown
# HTML filter that replaces issue references with links. References within
# <pre>, <code>, <a>, and <style> elements are ignored. References to issues
# that do not exist are ignored.
#
# This filter supports cross-project references.
#
# Context options:
# :project (required) - Current project, ignored when reference is
# cross-project.
# :reference_class - Custom CSS class added to reference links.
# :only_path - Generate path-only links.
#
class IssueReferenceFilter < HTML::Pipeline::Filter
include CrossProjectReference
# Public: Find `#123` issue references in text
#
# IssueReferenceFilter.references_in(text) do |match, issue, project_ref|
# "<a href=...>##{issue}</a>"
# end
#
# text - String text to search.
#
# Yields the String match, the Integer issue ID, and an optional String of
# the external project reference.
#
# Returns a String replaced with the return of the block.
def self.references_in(text)
text.gsub(ISSUE_PATTERN) do |match|
yield match, $~[:issue].to_i, $~[:project]
end
end
# Pattern used to extract `#123` issue references from text
#
# This pattern supports cross-project references.
ISSUE_PATTERN = /#{PROJECT_PATTERN}?\#(?<issue>([a-zA-Z\-]+-)?\d+)/
# Don't look for references in text nodes that are children of these
# elements.
IGNORE_PARENTS = %w(pre code a style).to_set
def call
doc.search('text()').each do |node|
content = node.to_html
next if project.nil?
next unless project.default_issues_tracker?
next unless content.match(ISSUE_PATTERN)
next if has_ancestor?(node, IGNORE_PARENTS)
html = issue_link_filter(content)
next if html == content
node.replace(html)
end
doc
end
def validate
needs :project
end
# Replace `#123` issue references in text with links to the referenced
# issue's details page.
#
# text - String text to replace references in.
#
# Returns a String with `#123` references replaced with links. All links
# have `gfm` and `gfm-issue` class names attached for styling.
def issue_link_filter(text)
self.class.references_in(text) do |match, issue, project_ref|
project = self.project_from_ref(project_ref)
if project.issue_exists?(issue)
# FIXME: Ugly
url = url_for_issue(issue, project, only_path: context[:only_path])
title = "Issue: #{title_for_issue(issue, project)}"
klass = "gfm gfm-issue #{context[:reference_class]}".strip
%(<a href="#{url}"
title="#{title}"
class="#{klass}">#{project_ref}##{issue}</a>)
else
match
end
end
end
def project
context[:project]
end
def url_for_issue(*args)
IssuesHelper.url_for_issue(*args)
end
def title_for_issue(*args)
IssuesHelper.title_for_issue(*args)
end
end
end
end
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