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module GitlabMarkdownHelper
# Replaces references (i.e. @abc, #123, !456, ...) in the text with links to
# the appropriate items in GitLab.
#
# text - the source text
# html_options - extra options for the reference links as given to link_to
#
# note: reference links will only be generated if @project is set
#
# see Gitlab::Markdown for details on the supported syntax
def gfm(text, html_options = {})
return text if text.nil?
return text if @project.nil?
# Extract pre blocks so they are not altered
# from http://github.github.com/github-flavored-markdown/
extractions = {}
text.gsub!(%r{<pre>.*?</pre>|<code>.*?</code>}m) do |match|
md5 = Digest::MD5.hexdigest(match)
extractions[md5] = match
"{gfm-extraction-#{md5}}"
end
# TODO: add popups with additional information
parser = Gitlab::Markdown.new(@project, html_options)
text = parser.parse(text)
# Insert pre block extractions
text.gsub!(/\{gfm-extraction-(\h{32})\}/) do
extractions[$1]
end
sanitize text.html_safe, attributes: ActionView::Base.sanitized_allowed_attributes + %w(id class )
end
# Use this in places where you would normally use link_to(gfm(...), ...).
#
# It solves a problem occurring with nested links (i.e.
# "<a>outer text <a>gfm ref</a> more outer text</a>"). This will not be
# interpreted as intended. Browsers will parse something like
# "<a>outer text </a><a>gfm ref</a> more outer text" (notice the last part is
# not linked any more). link_to_gfm corrects that. It wraps all parts to
# explicitly produce the correct linking behavior (i.e.
# "<a>outer text </a><a>gfm ref</a><a> more outer text</a>").
def link_to_gfm(body, url, html_options = {})
gfm_body = gfm(body, html_options)
gfm_body.gsub!(%r{<a.*?>.*?</a>}m) do |match|
"</a>#{match}#{link_to("", url, html_options)[0..-5]}" # "</a>".length +1
end
link_to(gfm_body.html_safe, url, html_options)
end
def markdown(text)
unless @markdown
gitlab_renderer = Redcarpet::Render::GitlabHTML.new(self,
# see https://github.com/vmg/redcarpet#darling-i-packed-you-a-couple-renderers-for-lunch-
filter_html: true,
with_toc_data: true,
hard_wrap: true)
@markdown ||= Redcarpet::Markdown.new(gitlab_renderer,
# see https://github.com/vmg/redcarpet#and-its-like-really-simple-to-use
no_intra_emphasis: true,
tables: true,
fenced_code_blocks: true,
autolink: true,
strikethrough: true,
lax_html_blocks: true,
space_after_headers: true,
superscript: true)
end
@markdown.render(text).html_safe
end
end
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