convert filenames in git to lowercase

gitdowncase.rb

#!/usr/bin/ruby
STDIN.read.split("\n").each do |file|
  file.gsub!("\n","")
  cmd = <<-CMD
    git mv #{file} #{file}~
    git mv #{file}~ #{file.downcase}
  CMD
  unless file == file.downcase
    `#{cmd}`
  end
end