#!/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.

preprocess do
  def reference_links
    # find reference item
    reference = @items.find{|item| item.identifier == '/references/'}

    # add automatic content to reference
    page_links = ["<!-- automatic content -->"]
    @site.printed_items.each do |i|
      page_links << "[#{i[:title]}]: #{i.identifier}"
   
      unless i[:alt_titles].nil?
        i[:alt_titles].each do |title|
          page_links << "[#{title}]: #{i.identifier}"
        end
      end
    end
    reference.add_content(page_links.join("\n"))
    
    unless reference.nil?
      # add references to every markdown item
      @site.printed_items.each do |item|
        if item[:extension] == "mkd"
          item.add_references reference.raw_content
        end
      end
    end
  end

  def hide_pages
    @items.each do |item|
      if item.identifier.match %r{^/(style)/}
        item[:is_hidden] = true
      end
    end
  end

  hide_pages # must be first
  @site.find_printed_items

  reference_links
end

compile '/style/' do
  filter :sass, :syntax => :scss
end

compile '/stuff/*' do
  # pass
end

compile '/references' do
  # link references are only added to other files
end

compile '/feed/' do
  filter :erb
end

compile '*' do
  if item.binary?
    # don't filter binary items
  else
    # little sanity check
    unless @item[:is_category] or @item[:non_cognitive]
      [:techne, :episteme, :date, :title].each do |header|
        if @item[header].nil?
          puts "#{@item.identifier} is missing #{header}."
        end
      end
    end

    # file-specific changes
    case @item[:extension]
    when "mkd" # normal pages
      filter :erb
      filter :kramdown, :toc_levels => [1,2]
      filter :colorize_syntax, :default_colorizer => :pygmentize
    when "org" # org-mode pages
      filter :org
    end

    # layout
    layout 'default'
    filter :tidy
  end
end

route '/feed/' do
  '/rss.xml'
end

route '/htaccess/' do
  '/.htaccess'
end

route '/style/' do
  '/style.css'
end

route '/references' do
  # pass
end

# never compile /stuff
route '/stuff/*' do
  route_unchanged
end

route '*' do
  if item.binary?
    route_unchanged
  else
    # Write item with identifier /foo/ to /foo/index.html
    item.identifier + 'index.html'
  end
end

layout '*', :erb