gitlab_markdown_helper.rb
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module GitlabMarkdownHelper
REFERENCE_PATTERN = %r{
(\W)? # Prefix (1)
( # Reference (2)
@([\w\._]+) | # User name (3)
[#!$](\d+) | # Issue/MR/Snippet ID (4)
[\h]{6,40} # Commit ID (2)
)
(\W)? # Suffix (5)
}x.freeze
def gfm(text, html_options = {})
return text if text.nil?
return text if @project.nil?
# Extract pre blocks
# 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
text.gsub!(REFERENCE_PATTERN) do |match|
vals = {
prefix: $1,
reference: $2,
user_name: $3,
reference_id: $4,
suffix: $5
}
if ref_link = reference_link(vals, html_options)
sprintf('%s%s%s', vals[:prefix], ref_link, vals[:suffix])
else
match
end
end
# Insert pre block extractions
text.gsub!(/\{gfm-extraction-(\h{32})\}/) do
extractions[$1]
end
text.html_safe
end
# circumvents nesting links, which will behave bad in browsers
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)
@__renderer ||= Redcarpet::Markdown.new(Redcarpet::Render::GitlabHTML.new(self, filter_html: true, with_toc_data: true), {
no_intra_emphasis: true,
tables: true,
fenced_code_blocks: true,
autolink: true,
strikethrough: true,
lax_html_blocks: true,
space_after_headers: true,
superscript: true
})
@__renderer.render(text).html_safe
end
private
def reference_link(vals, html_options)
# TODO: add popups with additional information
case vals[:reference]
# team member: @foo
when /^@/
user = @project.users.where(name: vals[:user_name]).first
member = @project.users_projects.where(user_id: user).first if user
link_to("@#{user.name}", project_team_member_path(@project, member), html_options.merge(class: "gfm gfm-team_member #{html_options[:class]}")) if member
# issue: #123
when /^#/
# avoid HTML entities
unless vals[:prefix].try(:end_with?, "&") && vals[:suffix].try(:start_with?, ";")
issue = @project.issues.where(id: vals[:reference_id]).first
link_to("##{issue.id}", project_issue_path(@project, issue), html_options.merge(title: "Issue: #{issue.title}", class: "gfm gfm-issue #{html_options[:class]}")) if issue
end
# merge request: !123
when /^!/
merge_request = @project.merge_requests.where(id: vals[:reference_id]).first
link_to("!#{merge_request.id}", project_merge_request_path(@project, merge_request), html_options.merge(title: "Merge Request: #{merge_request.title}", class: "gfm gfm-merge_request #{html_options[:class]}")) if merge_request
# snippet: $123
when /^\$/
snippet = @project.snippets.where(id: vals[:reference_id]).first
link_to("$#{snippet.id}", project_snippet_path(@project, snippet), html_options.merge(title: "Snippet: #{snippet.title}", class: "gfm gfm-snippet #{html_options[:class]}")) if snippet
# commit: 123456...
when /^\h/
commit = @project.commit(vals[:reference])
link_to(vals[:reference], project_commit_path(@project, id: commit.id), html_options.merge(title: "Commit: #{commit.author_name} - #{CommitDecorator.new(commit).title}", class: "gfm gfm-commit #{html_options[:class]}")) if commit
end
end
end