Add a script changing file extensions

bin/rename.rb

@@ -0,0 +1,29 @@
+#!/usr/bin/env ruby
+# This Source Code Form is subject to the terms of the Mozilla Public License,
+# v. 2.0. If a copy of the MPL was not distributed with this file, You can
+# obtain one at https://mozilla.org/MPL/2.0/. -}
+
+# frozen_string_literal: true
+
+require 'fileutils'
+
+if ARGV.length == 3
+  Dir.glob("#{ARGV[0]}/**/*.#{ARGV[1]}").each do |original|
+    new_name = original.sub /\.#{Regexp.escape(ARGV[1])}$/, ARGV[2]
+
+    puts "Renaming #{original} to #{new_name}."
+    FileUtils.mv original, new_name
+  end
+else
+  $stderr.puts <<~USAGE
+  Usage:
+    #{$0} directory old_extension new_extension
+
+  The directory is searched recursively.
+  The old and new extensions should not begin with a dot (.).
+
+  Example: #{$0} src ce.vue vue
+    Changes the extensions of all files matching src/**/*.ce.vue to .vue.
+  USAGE
+  exit 1
+end