submodules_to_neobundle.rb

File.open(".vimrc","a") do |f|
  f.write File.readlines('.gitmodules')
    .map(&:strip)
    # remove extras
    .reject do |l|
        l.scan('[').any?     || # submodule defs
        l.scan(/^path/).any? || # submodules paths
        l.empty?                # blank lines
      end
    # remap URLs to user/repo names
    .map do |url|
      url
        .sub('.git','')
        .sub(/url\s*=\s*https:\/\/github.com\//,'') 
      end
    # only 2 things left;  comments that need to be in VimL format, and repos for NeoBundle.
    .map {|repo| repo[0]=="#" ? repo.gsub('#','"') : "NeoBundle '#{repo}'" }
    .unshift("\n")
    .join("\n")
do

I wrote this for anyone converting their Vim plugin manager, from one that uses submodules, to NeoBundle.

It reads the .gitmodules file and appends the modified output to .vimrc.

There are more-universal things it could do, but I've coded it to handle my situation.