Rules

# -*- mode: ruby -*-
# vi: set ft=ruby :

TITLE_FILTER_REGEXP = /(#\s|#{BadgesFilter::BADGES_MARKDOWN_PATTERN})/.freeze

preprocess do
  badges_filter = BadgesFilter.new

  @items.each do |item|
    if item.identifier.to_s.end_with?(".md") && !item.binary?
      # If there isn't already a 'redirect_to' defined in the yaml frontmatter,
      # use the text to assume the redirect URL.
      unless item[:redirect_to]
        if item.raw_content =~ /^This document was moved to \[.*\]\(.*\)/m
          # Capture the intended page so the redirect page can redirect to it.
          item[:redirect_to] = item.raw_content.match(/^This document was moved to \[.*\]\((.*)\)/m)[1]
          # Correct the URL.
          item[:redirect_to] = item[:redirect_to].gsub!(/\.md/, '.html')
        end
      else
        # If the provided path is in Markdown
        if item[:redirect_to].to_s.match(/.md/)
          # If it's not a full URL
          unless item[:redirect_to].to_s.match(/^http/)
            # Correct it to HTML
            item[:redirect_to] = item[:redirect_to].gsub!(/\.md/, '.html')
          end
        end
      end

      # We need to do some transformations for the title
      # Let's extract and keep it first:
      raw_title = item.raw_content.match(/^[#] .*$/).to_s

      # If we don't have a title in frontmatter, reuse the one we just fetch
      item[:title] ||= raw_title.gsub(TITLE_FILTER_REGEXP, '')

      # Run badges filter with title fragment
      item[:title_badge] = badges_filter.run_from_markdown(raw_title.match(BadgesFilter::BADGES_MARKDOWN_PATTERN).to_s)
    end
  end
end

compile '/404.*' do
  filter :erb
  layout '/404.*'
  write '/404.html'
end

compile '/archives/index.*' do
  filter :erb
  layout '/archives.*'
  write '/archives/index.html'
end

compile '/**/*.html' do
  layout '/default.*'
end

compile '/**/*.md' do
  if item[:redirect_to].nil?

    # If 'toc' is absent in a file's yaml frontmatter, show ToC.
    # Set to 'toc: false' to disable it.
    include_toc = item[:toc].nil? ? true : false

    # Use GitlabKramdown with Rouge.
    # https://gitlab.com/brodock/gitlab_kramdown
    filter :gitlab_kramdown,
           input: 'GitlabKramdown',
           syntax_highlighter: 'rouge',
           syntax_highlighter_opts: {
             # In kramdown 2.0, the plaintext parser was removed and replaced by the
             # :guess_lang option:
             #
             # - https://github.com/gettalong/kramdown/blob/master/doc/news/release_2_0_0.page
             # - https://github.com/gettalong/kramdown/pull/573
             guess_lang: true
           },
           default_lang: 'Plain Text',
           hard_wrap: false,
           auto_ids: true,
           toc_levels: 2..5,
           with_toc: include_toc

    filter :convert_mermaid_html

    filter :colorize_syntax,
           default_colorizer: :rouge

    # GitLab price / tiers specific badges
    filter :badges

    filter :md_to_html_ext
    filter :admonition
    filter :icons
    filter :introduced_in

    if item[:layout].nil?
      layout '/default.*'
    else
      layout "/#{item[:layout]}.*"
    end
  else
    layout '/redirect.*'
  end
end

compile '/**/*.scss' do
  filter :erb
  filter :sass,
         syntax: :scss,
         style: :compressed
  write "#{item.identifier.without_ext}-v#{rep.item[:version]}.css"
end

# Do not compile minified assets
passthrough '/**/*.min.*'

compile '/assets/javascripts/*.js' do
  filter :erb
  write "#{item.identifier.without_ext}-v#{rep.item[:version]}.js"
end

compile '/index.*' do
  filter :erb
  layout '/home.*'
  write '/index.html'
end

compile '/sitemap.*' do
  filter :erb
  write '/sitemap.xml'
end

compile '/robots.*' do
  filter :erb
  write '/robots.txt'
end

route '/**/*.{html,md}' do
  if item.identifier =~ '/index.*'
    '/index.html'
  else
    "#{item.identifier.without_ext}.html"
  end
end

# Leave yaml files out
ignore '/_data/*.yaml'

compile '/**/*' do
  unless item.identifier.ext == 'scss'
    write item.identifier.to_s
  end
end

layout '/**/*', :erb

# Leave the favicon alone.
passthrough '/favicon.ico'

postprocess do
  system('nanoc frontend')

  Gitlab::SymlinksConverter.run(config, items)
end