ファイルをリネームするスクリプト

rename.rb

# Usage
# ruby rename.rb ~/Downloads/reg_test "homu_(\d+)_homu.(txt)" "sayaka_@[email protected]"

require "fileutils"

dir = File.expand_path(ARGV[0])
pattern = /#{ARGV[1]}$/
after = ARGV[2]

Dir.glob(File.join(dir, "**/*")).each do |filename|
  match_data = pattern.match(filename).to_a.tap(&:shift)
  next if match_data.empty?
  marks = after.scan(/(@\d+)/).flatten
  rename_rule = Hash[marks.zip(match_data)]

  renamed = after
  rename_rule.each do |mark, str|
    renamed = renamed.gsub(mark, str)
  end
  renamed = File.join(File.dirname(filename), renamed)
  FileUtils.mv(filename, renamed)

  puts "#{filename} を #{renamed} にリネームしました。"
end