merge asset directories

gistfile1.rb

def symlink_r(source, dest)
  # recursively symlinks a directory tree.
  # skips files that already exist.
  ::Dir.glob(::File.join(source, "**", "*")).each do |f|
    next if ::File.directory?(f)
    new_name = ::File.join(dest, f.gsub(/^#{source}/, "") )
    next if ::File.exists?(new_name) or ::File.symlink?(new_name)
    ::FileUtils.mkdir_p(::File.dirname(new_name))
    #puts "trying #{f} => #{new_name}"
    ::File.symlink(f, new_name)
  end
end

namespace :indigo do

  desc "Merge public assets, so apache can find them all"
  task :merge_assets do

    raise "missing releases_path" unless ENV['releases_path']
    raise "missing release_name" unless ENV['release_name']

    releases_path = ENV['releases_path']
    release_name = unless ENV['release_name']

    merged_dir = ::File.join(releases_path, release_name, "public_merged")

    # First, make the merged dir, and symlink in the current release
    ::FileUtils.remove_dir(merged_dir, :force => true)
    ::FileUtils.mkdir_p(merged_dir)
    symlink_r(::File.join(releases_path, release_name, "public"), merged_dir)

    # now, iterate over the older releases and symlink them in.
    # do this newest first. This will interate over the current_release again.
    # But I suspect it has many inefficiencies in diskio.
    ::Dir.glob(::File.join(releases_path,"*")).sort.reverse.each do |old_release|
      symlink_r(::File.join(old_release, "public"), merged_dir)
    end
  end
end