#!/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.

passthrough '/assets/**'
passthrough '/_redirects'
passthrough '*/images/*'

# RSS Feed
compile '/blog/feed/' do
    filter :erb
end

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

compile '*' do
  filter :erb if item[:extension] == 'html'

  if item[:extension] == 'md'
    filter :redcarpet, options: {filter_html: true, autolink: true, no_intraemphasis: true, fenced_code_blocks: true, gh_blockcode: true, tables: true}, renderer_options: {with_toc_data: true}
    filter :normalize_links, item[:repo_docs] if item[:repo_docs]
    filter :version_warning, item[:repo_docs] if item[:repo_docs]
    filter :add_anchors
    filter :bootstrappify
    filter :admonition
    filter :colorize_syntax, :default_colorizer => :pygmentsrb
    filter :config_linker if item[:title] == 'Configuration'
    filter :toc, style: item[:toc]
    if item[:kind] == 'article'
      layout 'blog'
    else
      # TODO(mr): separate layout selection from Markdown handling
      layout item[:layout] || 'docs'
    end
  elsif item[:extension] == 'css'
    # don’t filter stylesheets
  elsif item.binary?
    # don’t filter binary items
  elsif item[:layout]
    layout item[:layout]
  else
    layout 'default'
  end
end

route '/blog/' do
  '/blog/index.html'
end

# Transform /blog/<YYYY>-<MM>-<DD>-<post title> to
# /blog/<YYYY>/<MM>/<DD>/<post title>.
route '/blog/*' do
  y, m, d, slug = /([0-9]+)\-([0-9]+)\-([0-9]+)\-([^\/]+)/.match(item.identifier).captures

  "/blog/#{y}/#{m}/#{d}/#{slug}/index.html"
end

route '*' do
  if item[:extension] == 'css'
    # Write item with identifier /foo/ to /foo.css
    item.identifier.chop + '.css'
  elsif item.binary?
    # Write item with identifier /foo.dat to /foo.dat
    item.identifier.to_s
  else
    # Write item with identifier /foo/ to /foo/index.html
    item.identifier + 'index.html'
  end
end

layout '*', :erb