require 'thread' require 'fspath' require 'image_optim/bin_resolver/simple_version' require 'image_optim/bin_resolver/comparable_condition' class ImageOptim class BinNotFoundError < StandardError; end class BadBinVersion < StandardError; end # Handles resolving binaries and checking versions # # If there is an environment variable XXX_BIN when resolbing xxx, then a # symlink to binary will be created in a temporary directory which will be # added to PATH class BinResolver # Holds name and version of an executable class Bin attr_reader :name, :version def initialize(name, version) @name = name @version = version && SimpleVersion.new(version) end def to_s "#{@name} #{@version || '-'}" end end attr_reader :dir def initialize(image_optim) @image_optim = image_optim @bins = {} @lock = Mutex.new end def resolve!(name) name = name.to_sym resolving(name) do bin = Bin.new(name, version(name)) if resolve?(name) if bin && @image_optim.verbose $stderr << "Resolved #{bin}\n" end @bins[name] = bin end if @bins[name] check!(@bins[name]) else fail BinNotFoundError, "`#{name}` not found" end end VENDOR_PATH = File.expand_path('../../../vendor', __FILE__) def env_path [dir, ENV['PATH'], VENDOR_PATH].compact.join(':') end private def resolving(name) return if @bins.include?(name) @lock.synchronize do yield unless @bins.include?(name) end end def resolve?(name) if (path = ENV["#{name}_bin".upcase]) unless @dir @dir = FSPath.temp_dir at_exit{ FileUtils.remove_entry_secure @dir } end symlink = @dir / name symlink.make_symlink(File.expand_path(path)) end accessible?(name) end def accessible?(name) capture_output("which #{name.to_s.shellescape}") != '' end def version(name) case name.to_sym when :advpng, :gifsicle, :jpegoptim, :optipng capture_output("#{name} --version")[/\d+(\.\d+){1,}/] when :svgo capture_output("#{name} --version 2>&1")[/\d+(\.\d+){1,}/] when :jhead capture_output("#{name} -V")[/\d+(\.\d+){1,}/] when :jpegtran capture_output("#{name} -v - 2>&1")[/version (\d+\S*)/, 1] when :pngcrush capture_output("#{name} -version 2>&1")[/\d+(\.\d+){1,}/] when :pngout date_regexp = /[A-Z][a-z]{2} (?: |\d)\d \d{4}/ date_str = capture_output("#{name} 2>&1")[date_regexp] Date.parse(date_str).strftime('%Y%m%d') end end def check!(bin) is = ComparableCondition.is case bin.name when :pngcrush case bin.version when c = is.between?('1.7.60', '1.7.65') fail BadBinVersion, "`#{bin}` (#{c}) is known to produce broken pngs" end when :advpng case bin.version when c = is < '1.17' warn "Note that `#{bin}` (#{c}) does not use zopfli" end end end def capture_output(command) `env PATH=#{env_path.shellescape} #{command}` end end end