Rules

#!/usr/bin/env ruby
# coding: utf-8

# A few helpful tips about the Rules file:
#
# * The string given to #compile and #route are matching patterns for
#   identifiers--not for paths. Therefore, you can’t match on extension.
#
# * The order of rules is important: for each item, only the first matching
#   rule is applied.
#
# * Item identifiers start and end with a slash (e.g. “/about/” for the file
#   “content/about.html”). To select all children, grandchildren, … of an
#   item, use the pattern “/about/*/”; “/about/*” will also select the parent,
#   because “*” matches zero or more characters.

KRAMDOWN_OPTS = { auto_ids: true, input: 'GFM', syntax_highlighter: 'rouge' }
BYPASS_FILES = %w(404.html crossdomain.xml humans.txt robots.txt googlebd82924855df6b5d.html) unless defined?(BYPASS_FILES)

# from https://github.com/mgutz/nanoc3_blog/blob/master/Rules
preprocess do
  config[:env] = ENV['NANOC_ENV'] ||= 'development'
  config[:is_deploying] = ['production', 'staging'].include?(ENV['NANOC_ENV'])
  config[:htpasswd_path] = ENV['HTPASSWD_PATH']

  # authors may unpublish items by setting meta attribute `publish: false`
  items.delete_if { |item| item[:publish] == false }

  tags("article", :en).each do |tag, mtime|
    @items.create(
      "",
      {
        :title => %Q{Posts tagged “#{tag}”},
        :tag => tag.to_s,
        :mtime => mtime,
        :kind => "tag",
        :lang => :en,
      },
      "/posts/tags/#{Tag::clean_name(tag)}"
    )
  end

  tags("article", :de).each do |tag, mtime|
    @items.create(
      "",
      {
        :title => %Q{Beiträge mit Schlagwort “#{tag}”},
        :tag => tag.to_s,
        :mtime => mtime,
        :kind => "tag",
        :lang => :de,
      },
      "/de/posts/tags/#{Tag::clean_name(tag)}"
    )
  end

  # TODO: Add Year/Month overviews for all languages
  years, months = Post::years_and_months(posts())

  years.each do |year, mtime|
    @items.create(
      "<%= render '/_posts_per_time.*', :from => '#{year}-01-01', :to => '#{year}-12-31' %>",
      {
        :title => %Q{Posts from #{year}},
        :mtime => mtime
      },
      "/posts/#{year}"
    )
  end

  months.each do |monthdata, mtime|
    month = Month.new(monthdata)
    @items.create(
      "<%= render '/_posts_per_time.*', :from => '#{month.first_day}', :to => '#{month.last_day}' %>",
      {
        :title => %Q{Posts from #{month.title} #{month.year}},
        :mtime => mtime
      },
      month.post_url
    )
  end
end

BYPASS_FILES.each do |file|
  passthrough "/#{file}"
end

ignore '/**/_*' # don't compile and route partials (used for SASS, JS)

compile '/css/fonts/*' do
  write item.identifier
end

compile '/css/vendor/*' do
  filter :erb          # Use erb to enable timestamps and author information and such.
  filter :dart_sass, syntax: 'scss'
  write item.identifier
end

compile '/css/**/*' do
  filter :erb          # Use erb to enable timestamps and author information and such.
  filter :dart_sass, syntax: 'scss'
  write item.identifier.without_ext + '-' + fingerprint('/css/*') + ".css"
end

compile '/js/vendor/*' do
   write item.identifier
end

compile '/js/**/*' do
   filter :concat_js
   filter :uglify_js if config[:is_deploying]
   write item.identifier.without_ext  + '-' + fingerprint('/js/*') + '.js'
end

compile '/sitemap.*' do
  filter :erb
  write item.identifier.to_s
end

compile '/htaccess.*' do
  filter :erb
  write '/.htaccess'
end

#
# Blog
#

compile '**/feed.atom' do
  filter :erb
  write item.identifier.to_s
end

compile '/posts/tags/*.*' do
  filter :erb
  filter :kramdown, KRAMDOWN_OPTS

  layout '/plain.*'
end

compile %r{^/(de/)?posts/tags/.*?} do
  filter :erb
  layout '/tags.*'
end

compile %r{^/posts/\d{4}(/\d{2})?$} do
  filter :erb
  layout '/plain.*'
end

compile '/posts/*' do
  filter :erb
  filter :kramdown, KRAMDOWN_OPTS

  layout '/plain.*'

  filter :add_toc
end

compile '/overview/index.md' do
  filter :erb
  filter :kramdown, KRAMDOWN_OPTS

  layout '/plain.*'

  filter :add_toc
end


compile '/posts/**/*' do
  unless item.binary? # don’t filter binary items
    filter :erb
    filter :kramdown, KRAMDOWN_OPTS

    layout '/blog.*'

    filter :add_toc
  end
end

#
# Misc content
#

compile '/**/*' do
  if item.binary?
    write item.identifier.to_s
    next
  end

  case item[:extension]
    when 'md', 'markdown', 'txt', 'text'
      filter :erb
      filter :kramdown, KRAMDOWN_OPTS
    else
      filter :erb
      filter :typogruby
  end

  if item[:layout]
    layout '/'+item[:layout]+'.*'
  else
    layout '/plain.*'
    # layout 'default' # use if basic `section > h1` setting doesn't suffice
  end

  if item_has_toc?(item)
    filter :add_toc
  end
end


############################################################################

route '/404.*' do
  item.identifier.without_ext + '.html'
end

route %r{^/(de/)?posts/.*?} do |_, custom_lang|
  if item.binary?
    id = item.identifier.components.last
    post_id = item.identifier.components[-2]

    "/posts/" + post_id + "/" + id
  elsif item[:kind] == 'article'
    if custom_path = item[:custom_path]
      path = custom_path.chomp('/')
    else
      path = item.identifier.without_ext
               .gsub(/\d{4}\/\d{2}\//, "") # remove date portion
               .gsub(/\/index$/, "") # drop index file name
      path = "/" + custom_lang.to_s + path if !custom_lang.nil?
    end

    path + '/index.html'
  else # tags, date archives
    path = item[:custom_path] || item.identifier.without_ext
    if path =~ %r{/index$}
      path + '.html'
    else
      path + '/index.html'
    end
  end
end

route '/**/*' do
  if item.binary?
    item.identifier.to_s
  else
    path = item[:custom_path] || item.identifier.without_ext
    if path =~ %r{/index$}
      path + '.html'
    else
      path + '/index.html'
    end
  end
end

############################################################################

layout '/**/*', :erb