exe/pry-try in pry-try-0.2.2 vs exe/pry-try in pry-try-0.2.3

@@ -1,7 +1,46 @@
 #!/usr/bin/env ruby
 
+if ARGV.empty? || %w(-h --help).include?(ARGV.first)
+  puts(<<-EOH)
+    EXAMPLES
+
+    Try scripts:
+
+    $ cat some-script.rb | pry-try
+
+    Try gems:
+
+    $ pry-try redis
+    ... some bundling ...
+    irb(main):001:0> Redis
+    => Redis
+
+    Multiple gems:
+
+    $ pry-try redis rake
+
+    Specific version:
+
+    $ pry-try redis '3.1.0'
+
+    ...or any requirement that would be understood by bundler:
+
+    $ pry-try redis '~> 3.1.0'
+
+    Combined with gems that don't need a specific version:
+
+    $ pry-try redis '~> 3.1.0' rake gem_with_version '1.0'
+
+EOH
+  exit
+elsif %w(-v --version).include?(ARGV.first)
+  require 'pry-try'
+  puts PryTry::VERSION
+  exit
+end
+
 VERSION_LIKE_RE = [Gem::Requirement::PATTERN, /v?\d+\.\d+/, /^\h+$/].freeze
 
 def parse_args(args)
   args.each_with_object([]) do |arg, obj|
     matches_arg = arg.method(:match).to_proc
@@ -17,32 +56,31 @@
   'rails' => %w(rails/all active_support/all),
   'activerecord' => %w(active_record),
   'activesupport' => %w(active_support/all),
 }.freeze
 
-gems = parse_args(ARGV).map do |gem|
+@gems = parse_args(ARGV).map do |gem|
   if r = REQUIREMENTS[gem.first]
     gem << {:require => r}
   else
     gem
   end
 end
 
-if $stdin.tty?
+if @gems.any?
   require 'tempfile'
   require 'yaml'
-  script = Tempfile.new.tap do |f|
+  @script = Tempfile.new('pry-try').tap do |f|
     File.write(f, <<CODEZ.gsub(/\n+ *(?=\S)/, ';'))
 require 'bundler/inline'
+require 'yaml'
 
 gemfile(true) do
   source 'https://rubygems.org'
   gem 'pry'
-  YAML.load(#{YAML.dump(gems).inspect}).each {|gargs| gem(*gargs) }
-end
-$stdin = $stdin.reopen '/dev/tty';
+  YAML.load(#{YAML.dump(@gems).inspect}).each {|gargs| gem(*gargs) }
+end;nil
 CODEZ
   end
-  exec %{cat #{script.path} | pry}
-else
-  exec %{script=$(cat;echo; echo '$stdin = $stdin.reopen "/dev/tty";'); printf "${script}" | pry}
 end
+
+ exec %{unset BUNDLE_BIN;script=$(cat #{@script ? @script.path : ''} #{$stdin.tty? ? '' : '-'}; echo;echo '$stdin = $stdin.reopen "/dev/tty";'); printf "${script}" | pry}