git_recursive_search.rb

#!/usr/bin/env ruby

require 'fileutils'
require 'optparse'

options = {}
OptionParser.new do |opts|
  opts.banner = "Usage: #{__FILE__} -r REGEXP START_PATH"

  opts.on("-r", "Pattern") do |v|
    options[:regexp] = v
  end
end.parse!

unless ARGV[0] && options[:regexp]
  puts "Usage: #{__FILE__} -r REGEXP 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
        puts "Repository: #{dir}"
        objects = `cd #{dir} && git grep #{options[:regexp]} HEAD`
        puts objects
      end
    else
      search_submodules(dir, options)
    end
  end
end

search_submodules(ARGV[0], options)