textile2html

#! /usr/bin/env ruby
require "optparse"

DEFAULT_OPTIONS = {
  :layout => File.expand_path("./textile2html_layout.html.erb", File.dirname(__FILE__)),
  :src_dir => File.expand_path("."),
  :dest_dir => File.expand_path("."),
  :noop => false,
  :verbose => false,
}

options = DEFAULT_OPTIONS.dup

OptionParser.new do |opt|
  opt.on("-l", "--layout=#{options[:layout]}"){|v| options[:layout] = v}
  opt.on("-s", "--src-dir=#{options[:src_dir]}"){|v| options[:src_dir] = v}
  opt.on("-d", "--dest-dir=#{options[:dest_dir]}"){|v| options[:dest_dir] = v}

  opt.on("-n", "--noop"){ options[:noop] = true}
  opt.on("-v", "--verbose"){ options[:verbose] = true}
  opt.parse!(ARGV)
end

require 'fileutils'
require 'erb'
require 'rubygems'
require 'RedCloth'

def binding_for_yield
  binding
end

def pickup_headers(body)
  links = []
  result = body.gsub(/(<h[1-6]>)(.*?)<\/h[1-6]>/) do |*args|
    # puts "args: #{args.inspect}"
    tag, desc = $1, $2
    depth = tag.gsub(/\D/, '').to_i
    links << [depth, desc]
    "<h#{depth}><a name=\"#{desc}\">#{desc}</a></h#{depth}>"
  end
  return result, links
end

def build_page_outlines(links)
  src = links.map{|(depth, desc)| "#" * depth << ' "' << desc << '":#' << desc }.join("\n")
  RedCloth.new(src).to_html
end

src_dir = File.expand_path(options[:src_dir])
src_files = Dir["#{src_dir}/**/*.textile"]
src_files.each do |src_file|
  src = File.read(src_file)
  html_body = RedCloth.new(src).to_html

  html_body, links = pickup_headers(html_body)

  b = binding_for_yield do|*args|
    arg = args.first
    case arg
    when nil then html_body
    when :page_outline then build_page_outlines(links)
    else
      nil
    end
  end

  erb = ERB.new(File.read(options[:layout]))
  html = erb.result(b)
  rel_path = src_file.sub("#{Regexp.escape(src_dir)}/", '')
  dest_rel_path = rel_path.sub(/\.textile$/, '.html')
  dest_path = File.expand_path(dest_rel_path, options[:dest_dir])
  dest_dir = File.dirname(dest_path)
  FileUtils.mkdir_p(dest_dir)
  File.open(dest_path, "w"){|f| f.puts(html)}
end