Module: Asciidoctor::Html::CacheBuster

Defined in:
lib/asciidoctor/html/cache_buster.rb

Overview

Postprocess site with cachebusting paths

Defined Under Namespace

Classes: AssetData

Class Method Summary collapse

Class Method Details

.process(outdir) ⇒ Object 



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# File 'lib/asciidoctor/html/cache_buster.rb', line 13

def self.process(outdir)
  puts "-- Begin cache busting --"
  puts
  cache = {} # assetpath => {:filehash,:newpath}
  glob = ["**/*.html", "*.webmanifest"]
  Pathname(outdir).glob(glob) do |filepath|
    puts "Processing"
    puts "  #{filepath}"
    scanner = StringScanner.new(filepath.read)
    rgx = %r{"((?<prefix>[\./]*?#{ASSETS_PATH}/.+?)(?<hash>\.|\.[a-f0-9]{8}\.)(?<ext>[a-z]+?))"}
    buffer = []
    while (scanned = scanner.scan_until(rgx))
      matched = scanner.matched
      buffer << scanned[0, scanned.size - matched.size]
      matchedpath = Pathname(matched[1..-2])
      assetpath = filepath.dirname / matchedpath
      if assetpath.file?
        assetpath = assetpath.realpath
        captures = scanner.named_captures
        cache[assetpath] ||= AssetData.new
        assetdata = cache[assetpath]
        assetdata.filehash ||= format("%08x", Zlib.crc32(assetpath.read))
        new_hash = assetdata.filehash
        found_hash = captures["hash"][1..-2] unless captures["hash"] == "."
        if new_hash == found_hash
          buffer << matched
        else
          new_name = "#{captures["prefix"]}.#{new_hash}.#{captures["ext"]}"
          buffer << %("#{new_name}")
          assetdata.newpath = filepath.dirname / Pathname(new_name)
        end
      else
        buffer << matched
      end
    end
    buffer << scanner.rest
    filepath.write buffer.join
  end
  cache.each_pair do |assetpath, assetdata|
    next unless assetdata.newpath

    puts
    puts "Renaming:"
    puts "  #{assetpath}"
    puts "->#{assetdata.newpath}"
    assetpath.rename(assetdata.newpath)
  end
  puts
  puts "-- End cache busting --"
end