git-count.rb

# Counts the total number of insertions and deletions in a git repository's lifetime

require 'git'

repo = Git.open('../emberall')
prev = repo.log.first

deletions = 0
insertions = 0
repo.log(count = 5000).each do |commit|
  source_file = /.*(rb)|(jsx)|(cljs)|(scss)|(yml)/
  stats_files = repo.diff(commit, prev).stats[:files]
                                    .select { |f| f =~ source_file }
  
  deletions += stats_files.inject(0) { |sum, f| sum + f.last[:deletions] }
  insertions += stats_files.inject(0) { |sum, f| sum + f.last[:insertions] }

  prev = commit
end

puts "Deletions: #{deletions}"
puts "Insertions: #{insertions}"