Search git submodules in repositories

submodules_saercher.rb

#!/usr/bin/env ruby

require 'fileutils'
require 'optparse'

options = {}
OptionParser.new do |opts|
  opts.banner = "Usage: #{__FILE__} [options] START_PATH"

  opts.on("-r", "--hide-repository", "Do not show repository name") do |v|
    options[:hide_repo] = v
  end

  opts.on("--search SUBMODULE_URL", String,
          "Search repositories that includes submodules with specified URL") do |v|
    options[:search] = v
  end
end.parse!

unless ARGV[0]
  puts "Usage: #{__FILE__} [options] START_PATH"
  exit
end

def search_submodules(start_dir, options)
  Dir.glob(File.join(start_dir, "*/")) do |dir|
    if File.exists?(File.join(dir, ".git")) || File.exists?(File.join(dir, "HEAD"))
      count_objects = `cd #{dir} && git count-objects -v`

      unless /count:\s0.*?size:\s0.*?packs:\s0/m =~ count_objects
        objects = `cd #{dir} && git ls-tree HEAD`

        objects.scan(/^\d{6}\s[a-z]+\s([^.]*?)\s\.gitmodules$/m) do |gitmodules_sha|
          gitmodules = `cd #{dir} && git show #{gitmodules_sha[0]}`

          submodules = gitmodules.scan(/url\s=\s(.*?)$/m).map { |s| s[0] }

          if !options.include?(:search) || submodules.include?(options[:search])
            unless options[:hide_repo]
              puts "Repository: #{dir}"
            end

            submodules.each { |s| puts s }
          end
        end
      end
    else
      search_submodules(dir, options)
    end
  end
end

search_submodules(ARGV[0], options)