recursive_rename from moodle

ruby

#!/usr/bin/env ruby
#coding:utf-8

# This script is used to rename files to the name of their parent directory when downloaded from moodle.
# Given
#├── user1
#│   └── foo.pdf
#└── user2
#    └── foo.pdf
#
#    The expected result of ruby recursive_rename.rb target_dir/ pdf is
#    user1.pdf
#    user2.pdf
#
#    Arguments
#    ARGV[0] The target directory
#    ARGV[1] The file extension to use

require 'fileutils'

target = ARGV[0]
extension = ARGV[1]

if target == nil || extension == nil
    raise "Error. Script requires 2 arguments. Call like 'ruby recursive_rename.rb target_dir/ pdf"
end

Dir.children(target).each do |child|
    child_dir = File.join(File.dirname(__FILE__), target, child)
    if File.directory?(child_dir)
        files = Dir.children(child_dir)
        if files.size > 1
            raise "Error. Found too many files in directory #{child_dir}"
        end

        filepath = File.join(child_dir,files[0])
        FileUtils.cp(filepath, "#{child}.#{extension}")
    else
        raise "Error. Found something in the target dir that's not a directory - #{child_dir}"
    end
end