partner_assets.rake

require "fileutils"

Rake::Task["assets:precompile"].enhance do
  Rake::Task["assets:precompile:partner"].invoke
end

Rake::Task["assets:clobber"].enhance ["assets:clobber:partner"]

namespace :assets do
  # try to log like Sprockets even though their stuff is all private
  def log(msg)
    STDERR.puts msg
    Rails.logger.info(msg) if Rails.respond_to?(:logger) && Rails.logger
  end

  def partner
    ENV["PARTNER"] || "example"
  end

  def base_path
    Rails.root.join("public", "assets", partner)
  end

  def match_pattern
    /(.+)-[0-9a-f]{64}(.+)/
  end

  def patterns
    ["*.html", "*.ico"]
  end

  def partner_files
    patterns.each do |pattern|
      files = Dir[base_path + pattern]

      groups = files.group_by do |file|
        match = File.basename(file).match(match_pattern)
        match[1..2].join("")
      end

      groups.each do |key, group|
        src = group.sort_by { |file| File.mtime(file) }.last
        dst = Rails.root.join("public", key)
        yield src, dst
      end
    end
  end

  namespace :precompile do
    desc "Copy the newest error page assets into /public"
    task :partner do
      partner_files do |src,dst|
        log "copy #{src} to #{dst}"
        FileUtils.cp src, dst
      end
    end
  end

  namespace :clobber do
    desc "Remove the error page assets in /public"
    task :partner do
      partner_files do |src,dst|
        log "clobber #{dst}"
        FileUtils.rm_f dst
      end
    end
  end
end