asciidoctor-epub3 in asciidoctor-epub3-1.5.0.alpha.10

- old
+ new

@@ -1,17 +1,18 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
-if File.exist?(asciidoctor_epub3 = (File.expand_path '../../lib/asciidoctor-epub3', __FILE__))
+if File.exist? asciidoctor_epub3 = (File.expand_path '../lib/asciidoctor-epub3', __dir__)
   require asciidoctor_epub3
 else
   require 'asciidoctor-epub3'
 end
 require 'asciidoctor/cli'
 
 options = Asciidoctor::Cli::Options.new backend: 'epub3'
 
-# FIXME provide an API in Asciidoctor for sub-components to print version information
+# FIXME: provide an API in Asciidoctor for sub-components to print version information
 unless ARGV != ['-v'] && (ARGV & ['-V', '--version']).empty?
   require_relative '../lib/asciidoctor-epub3/version'
   $stdout.write %(Asciidoctor EPUB3 #{Asciidoctor::Epub3::VERSION} using )
   # NOTE the print_version method was added in Asciidoctor 1.5.2
   if options.respond_to? :print_version
@@ -20,10 +21,10 @@
     puts %(Asciidoctor #{::Asciidoctor::VERSION} [http://asciidoctor.org])
   end
   exit 0
 end
 
-# FIXME This is a really bizarre API. Please make me simpler.
+# FIXME: This is a really bizarre API. Please make me simpler.
 case (result = options.parse! ARGV)
 when Integer
   exit result
 else
   invoker = Asciidoctor::Cli::Invoker.new options