Rules

#!/usr/bin/env ruby

# 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
  # Anything with an explicit published: false should vanish
  items.reject! {|item| item[:published] == false}

  items.each do |item|
    # Extract date from filename if present
    item.identifier.match(%r{(/.*)?/(\d\d\d\d-\d\d-\d\d)-(.*)/}) do |md|
      item.identifier = "#{md[1]}/#{md[3]}/"
      item[:date] ||= md[2]
    end

    # Set the kind for certin subfolders
    parts = item.identifier.split('/')
    if parts.length > 2
      case parts[1]
      when 'posts'
        item[:kind] ||= 'post'
      when 'talks'
        item[:kind] ||= 'talk'
      end
    end

    # Parse the date if present
    item[:date] = Date.parse(item[:date]) if item[:date].is_a?(String)

    # Set the extra timestamps for the Blogging helper
    item[:created_at] = item[:date].to_time if item[:date]
    item[:updated_at] = item[:mtime] if item[:mtime]

    # Convert the identifier into the title if not present
    if item[:kind]
      item[:title] ||= begin
        words = item.identifier.split('/').last.split('-')
        words.first.capitalize! # Always cap the first word
        words.each {|word| word.capitalize! if word.length > 3}
        words.join(' ')
      end
    end
  end
end

compile '/static/*' do
  # Don't touch static stuff
end

compile '/atom/' do
  filter :erubis
end

compile '/sitemap/' do
  filter :erubis
end

[
  ['*', rep: :default],
  ['/posts/*/', rep: :old_url], # Used to create a second copy at the old path
  ['/contact/', rep: :old_url],
].each do |args|
  compile(*args) do
    filter :erubis
    filter :kramdown, input: 'GFM', header_offset: item[:kind] ? 1 : 0, enable_coderay: false, hard_wrap: false, auto_id_stripping: true, parse_block_html: true if item[:extension] == 'md'
    filter :colorize_syntax, default_colorizer: :pygmentsrb
    layout item[:kind] if item[:kind]
    layout 'default'
  end
end

route '/static/*' do
  # Trim the leading /static and the trailing /
  item.identifier[7..-2]
end

route '/posts/*/' do
  item.identifier[6..-1] + 'index.html'
end

route '/404/' do
  '/404.html'
end

route '/atom/' do
  '/atom.xml'
end

route '/sitemap/' do
  '/sitemap.xml'
end

route '*' do
  item.identifier + 'index.html'
end

route '/posts/*/', rep: :old_url do
  "/#{item[:date].year}/#{'%02d' % item[:date].month}#{item.identifier[6..-1]}index.html"
end

route '/contact/', rep: :old_url do
  '/contact.html'
end

layout '*', :erubis