module RenameFiles

# File lib/rename_files/cli.rb, line 8
def self.new_file_name(f, prefix: '', postfix: '')
  if prefix && !prefix.empty? && !f.match(/^#{prefix}/)
    f = prefix + f
  end
  if postfix && !postfix.empty? && !f.match(/#{postfix}$/)
    f << postfix
  end
  Zaru.sanitize!(f).shellescape
end

# File lib/rename_files/cli.rb, line 17
def self.rename(file_names, pattern: '.*', prefix: '', postfix: '', execute: false)
  file_names.each do |f|
    next if f.match(/^\.*$/) || !f.match(/#{pattern}/)
    if File.exist?(f)
      new_file_name_realized = new_file_name(
        if block_given? then yield(f) else f end,
        prefix: prefix,
        postfix: postfix
      )
      next if new_file_name_realized == f.shellescape

      command = "mv -- #{f.shellescape} #{new_file_name_realized}"
      puts command
      if execute
        system command
      end
    else
      STDERR.puts "WARNING: \"#{f}\" does not exist"
    end
  end
end