Adds bin/namespacer for local testing

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    namespacer (0.1.0)
+    namespacer-rb (0.1.3)
       parser (~> 3)
       tty-command (~> 0.10)
       unparser (~> 0.6)
@@ -70,7 +70,7 @@ PLATFORMS
 
 DEPENDENCIES
   minitest (~> 5.16)
-  namespacer!
+  namespacer-rb!
   pry-byebug
   rake (~> 13.0)
   rubocop (~> 1.21)

bin/namespacer

@@ -0,0 +1,27 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+#
+# This file was generated by Bundler.
+#
+# The application 'namespacer' is installed as part of a gem, and
+# this file is here to facilitate running it.
+#
+
+ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../Gemfile', __dir__)
+
+bundle_binstub = File.expand_path('bundle', __dir__)
+
+if File.file?(bundle_binstub)
+  if File.read(bundle_binstub, 300).include?('This file was generated by Bundler')
+    load(bundle_binstub)
+  else
+    abort("Your `bin/bundle` was not generated by Bundler, so this binstub cannot run.
+Replace `bin/bundle` by running `bundle binstubs bundler --force`, then run this command again.")
+  end
+end
+
+require 'rubygems'
+require 'bundler/setup'
+
+load Gem.bin_path('namespacer-rb', 'namespacer')

exe/namespacer

@@ -28,6 +28,11 @@ parser = OptionParser.new do |opts|
 
   opts.on('-i', '--in-place', 'Modify files in-place') { |_| options.in_place = true }
 
+  opts.on('-V', '--version', 'Print version') do
+    puts "namespacer #{Rubyists::Namespacer::VERSION}"
+    exit
+  end
+
   opts.on('-v', '--verbose', 'Verbose output') do
     options.verbose = true
   end